when using the pipet, the pipet bulb need to be inserted onto the end of the glass pipet , it should insert the tip into the beaker that it is about 1/4th from bottom.
The pipet is used to transfer the measured liquid. The pipet is accurate as the burette. The pipet tip when immersed in the liquid , its tip just below the liquid's surface of about 2 mm to 3 mm. Pipette is the laboratory tool that is commonly used in the chemistry and biology.
The main and the important function of the pipet is to measured and transfer the small quantity of the liquid.
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2c2h2(g) + 5o2(g) → 4co2(g) + 2h2o(g) this is a balanced equation for the combustion of acetylene (c2h2). how many grams of acetylene(c2h2 ) are required to produce 1.0 moles of co2?
13.015 grams of acetylene (C2H2) are required to produce 1.0 moles of CO2.
To find the number of grams of acetylene (C2H2) required to produce 1.0 moles of CO2, we can use the balanced equation for the combustion of acetylene: 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)
From the balanced equation, we know that for every 2 moles of C2H2 that react, 4 moles of CO2 are produced. Therefore, if we want to produce 1.0 moles of CO2, we need to react 1.0 moles of CO2 / 4 moles CO2/ 2 moles C2H2 = 0.5 moles of C2H2.
To convert moles to grams, we use the molar mass of C2H2 which is 26.03 g/mol
So, 0.5 moles of C2H2 = 0.5 x 26.03 g/mol = 13.015 g C2H2
Therefore 13.015 grams of acetylene (C2H2) are required to produce 1.0 moles of CO2
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is 0.5 of ammonia alkanoic acid weighs 44 g determine the molecular formula and the name of the acid
The molecular formula and name of the acid would be [tex]C_4H_8O_2[/tex] and butanoic acid respectively.
Molecular formula of alkanoic acidsThe number of moles of the alkanoic acid is 0.5 mol and the mass of the acid is 44g. We can use this information to determine the molar mass of the acid as follows:
Molar mass = mass/mole = 44/0.5 = 88 g/mol
The alkanoic acid with a molar mass of 88 g/mol is butanoic acid.
[tex]C_4H_8O_2[/tex] = (12x4) + (1x8) + (16x2) = 88 g/mol
In other words, the name of the mono alkanoic acid is butanoic acid and the molecular formula is [tex]C_4H_8O_2[/tex].
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If 0.5 mol of mono-alkanoic acid weighs 44 g determine the molecular formula and the name of the acid
Select all intermolecular forces that contribute to creating a solution of KBr in H2O.a. London Dispersionb. H-bondingc. Ion-dipoled. Dipole-Dipole
London Dispersion and Ion-dipoled intermolecular forces contribute to creating a solution of KBr in H₂O.
London Dispersion forces occur between all molecules and result from the fluctuating distribution of electrons in the molecules, leading to a temporary dipole moment. Dipole-dipole forces are attractive interactions between the positively charged end of one molecule and the negatively charged end of another molecule.
The underlying universal forces that cause attractive interactions between nonpolar molecules are Van der Waals or London dispersion forces. London dispersion forces (LDF), dipole-dipole interactions, and hydrogen bonds are the three different intermolecular forces. All substances at least have LDF, but molecules can have any combination of these three types of intermolecular interactions.
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It is required to make 20 grams of certain chemical compound called z. This is made from compounds w, x, and y in the ratio of 2:1:3. The compound y is itself made from w and x. To make 6 grams of y requires 4 grams of w and 2 grams of x. How much w and x is required to make the required amount of z.
9.32 grams of W and 4.66 grams of X are required to make the required amount of z.
What is a compound?
A compound is a material created by the chemical joining of two or more distinct components. Examples of compounds are table salt (NaCl), which is formed of the elements sodium and chloride, and water (H2O), which is made of the elements hydrogen and oxygen.
Given;
Mass of Z = 14 grams
W:X:Y = 2:1:3
4 grams of W and 2 grams of X are required to make 6 grams of Y
W:X = 4:2 = 2:1
Substituting the composition of Y to Z
Z = W:X:Y = 2:1:3
We have;
Z = W:X = 4:2 = 2:1
The final mixing ratio for W and X are 2:1,
To make 14 grams of Z, we need;
W = 2/3 × 14grams = 28/3 grams
W = 9.33 grams
X = 1/3 × 14grams = 14/3 grams
X = 4.67 grams
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Chemical formula of protein
Answer:
Although amino acids may have other formulas, those in protein invariably have the general formula RCH(NH2)COOH, where C is carbon, H is hydrogen, N is nitrogen, O is oxygen, and R is a group, varying in composition and structure, called a side chain.
Explanation:
(◕ᴗ◕✿)(◕ᴗ◕✿)(◕ᴗ◕✿)
What happens to pressure when.. *read image*
Answer:
Explanation:
the answer is B.
A car drives down the freeway at 68 mi/hr. What is its speed in m/s?
Answer: 30.3987 m/s
you might need to round that to the nearest hundredth or tenth
Explanation:
To solve this we must be knowing each and every concept related to speed and its calculations. Therefore, 68 mi/hr in m/s is 28.9m/s.
What is speed?Speed may be defined as the distance traveled by an item in relation to the time that takes to travel that distance. In other words, it measures how rapidly an item travels but does not provide direction. The term "velocity" refers to the combination of direction and speed.
The average speed is the total distance traveled by the item in a particular time frame. A scalar quantity is average speed. The magnitude of a scalar quantity indicates that it has no direction.
Speed=Distance/Time
68 mi/hr in m/s?
68 mi/3600=0.018m mi/s×1609
=28.9m/s
Therefore, 68 mi/hr in m/s is 28.9m/s.
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explain the process that creates chemical elements lighter than iron, including evidence
The process that creates chemical elements lighter than iron is known as nuclear fusion and the evidence is the fusion of carbon and helium nuclei which forms an oxygen nucleus, and so on.
What is Nuclear fusion?This is referred to as the type of reaction which is characterized by two or more atomic nuclei being combined to form one or more different atomic nuclei and subatomic particles.
It is also responsible for the creation of chemical elements lighter than iron through successive reactions and a common example is the fusion of carbon and helium nuclei to form an oxygen nucleus thereby making it the correct choice.
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How many molecules are in 1.2 moles of H₂O?
What is the vapor pressure of a solution made from 23.5 g of glycerin in 130 g of methanol at 50 °C? The vapor pressure of pure methanol at 50 °C is 400 torr. Report your answer in torr and round to the first decimal place. Glycerin = C3H5(OH)3
Using the expression of Clausius-Clapeyron equation we can calculate the vapor pressure. Putting all the values in the expression we get the result.
The vapor pressure can be defined as the force that an evaporating substance exerts against the walls of a sealed container. ln (P1/P2) = (ΔHvap. /R) (1/T2 - 1/T1). where, P1 and P2 are the vapor pressures at two temperatures T and T2 . A solution made from 23.5 g of glycerin in 130 g of methanol at 50 °C. The vapor pressure of pure methanol at 50 °C is 400 torr. Clausius-Clapeyron equation allows to estimate the vapor pressure at another temperature if the vapor pressure is known at some temperature and if the enthalpy of vaporization is known. The partial vapor pressure of a component in a mixture is equal to the vapor pressure of the component at that temperature multiplied by the component's mole fraction.
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a buffer solution contains ethanoic acid and its conjugate base; the pka of ethanoic acid is 4.74. at what ph does the solution buffer?
A buffer solution of diclofenac (pKa= 4.15) is buffered at ph 5.5.
The Henderson-Hasselbalch equation is commonly used to calculate the pH of buffer solutions. Buffers are made up of a weak acid and a conjugate base. As a result, for a generic weak acid, we could call it HA, and its conjugate base would be A-. To calculate the pH of the buffer solution, find the pKa of the weak acid and multiply it by the log of the conjugate base concentration divided by the concentration of the weak acid.
First, we need to know the pKa of the weak acid, which is acetic acid.The Ka value is less than one because acetic acid is a weak acid. To find the pKa of acetic acid, we take the negative log of the Ka value. So the negative log of 1.8 times 10 to the negative fifth is equal to 4.74. So we can go back to the Henderson-Hasselbalch equation and write that the pH is equal to the pKa, which we just calculated to be 4.74 plus the log of the concentration of the conjugate base.
And therefore, the pH of the buffer solution is less than the pKa of the weak acid. And in the third example, the concentration of the weak acid was less than the concentration of the conjugate base.
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True or False: If you have two different isotopes, like Chlorine-35 and Chlorine-37, they have the same number of neutrons
True
False
Answer:
I believe the answer is True
Explanation:
I could be wrong but in order for Chlorine 35 and Chlorine 37 to be different would they have to have a different amount of electrons? I am sorry if this is wrong. I took Chemistry a few years ago.
Answer:
The number after the name 'chlorine' is called the mass number. The mass number is a tally of the number of protons and the number of neutrons in an atom's nucleus. Since all atoms of chlorine contain 17 protons, chlorine-35 and chlorine-37 differ in the number of neutrons each one has.
Explanation:
So its true lol
:)
What is the empirical formula for a compound that is 43. 6% phosphorus and 56. 4% oxygen?.
The empirical formula, P₂O₅, is the simplest whole number ratio to define the atoms that make up a species.
We calculate the ratio of phosphorus and oxygen atoms using the assumption that there are 100 g of unknown. There are 56.36 g of oxygen and 43.64 g of phosphorus in 100 g of material.
We divide via by each component's atomic mass:
O : 56.36 g / 16 g/mol = 3.52 mol oxygen
P : 43.64 g / 31 g/mol = 1.41 mol phosphorus
We want to get whole numbers, thus we divide through by the smallest molar quantity:
3.52. mol 1.41 mol of oxygen Equals 2.5
1 phosphorus is 1.41 mol of phosphorus.
A PO2.5 formula does us absolutely no benefit. The empirical formula is the simplest whole number ratio defining constituent atoms in a species, as we have shown, which is why. So, we only increase the ration by two to give P₂O₅ as required.
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Suppose that you run a reaction in ethanol to form a very non-polar organic substance. how would you extract your product?
To extract a very non-polar organic substance from a reaction that is run in ethanol, one possible method would be to use a liquid-liquid extraction technique.
This involves separating the non-polar product from the polar ethanol solvent by using a non-polar solvent that is immiscible with ethanol. One common non-polar solvent that can be used for this purpose is hexane. Hexane is immiscible with ethanol and is a good solvent for non-polar compounds. To extract the product, the reaction mixture is first cooled to separate any solid that may have formed. Then, the reaction mixture is added to a separatory funnel and the hexane is slowly added to the top of the funnel.
The two layers will separate and the hexane containing the non-polar product can be drained off the bottom of the funnel. The hexane layer is then washed with a small amount of aqueous solution (such as water or an aqueous solution of an acid or a base) to remove any remaining polar impurities and then dried over anhydrous salt (such as Na2SO4 or MgSO4) to remove any traces of water. After this process, the hexane can be evaporated to obtain the purified non-polar product.
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Place the following compounds in order of increasing strength of intermolecular forces:CH4 CH3CH2CH3 CH3CH3A) CH4 < CH3CH3 < CH3CH2CH3B) CH3CH2CH3 < CH3CH3 < CH4C) CH3CH2CH3 < CH4 < CH3CH3D) CH3CH3 < CH4 < CH3CH2CH3E) CH4 < CH3CH2CH3 < CH3CH3
Option A has the correct order of compounds that are arranged in order of increasing strength of intermolecular forces.
Intermolecular forces are those forces which binds the molecules together in any matter whether it be solid, liquid or gas. The strength of these forces may differ from one matter to other and are also weaker in nature as compared to the covalent bonding.
These forces determine bulk properties, such as melting points of solids and boiling points of liquids. Intermolecular forces are electrostatic in nature and arise from the interaction between positively and negatively charged species.
Here are some types of intermolecular forces that exists in nature:
Dipole-Dipole Interactions London dispersion forces Hydrogen bondsLearn more about Dipole-Dipole interactions here:
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A football player runs in a straight line down the field, crossing the 20-yard line when the stopwatch reads 12 seconds and crossing the 70-yard line when the stopwatch reads 17 seconds. What is his speed in yards per second?
please show how u did it too bc my teacher is pretty specific
The speed of the football player in yards per seconds is 3.10 yard line per second.
How to calculate speed?Speed refers to the rate of motion or action, specifically the magnitude of the velocity. It is the rate distance is traversed in a given time.
This suggests that the speed can be calculated by dividing the distance of the football player by the time taken.
According to this question, the football player runs in a straight line down the field, crossing the 20-yard line when the stopwatch reads 12 seconds and crossing the 70-yard line when the stopwatch reads 17 seconds.
Total Distance = 70 + 20 = 90 yard lineTotal time = 12 + 17 = 29 secondsSpeed = 90 ÷ 29 = 3.10 yard line/seconds
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2. An archer shoots three arrows at a target and each land within 1 cm of the others but none of the arrows is within 30 cm of the bull's eye. Discuss both the accuracy and the precision of the archer.
Answer:
Accuracy refers to how close the arrows are to the bull's eye, while precision refers to how close the arrows are to each other.
In this scenario, the archer's shots are precise but not accurate. The arrows are all within 1 cm of each other, which shows that the archer's shots are consistent and repeatable, but none of the arrows are within 30 cm of the bull's eye. This means that the archer's shots are accurate to a certain extent, but not accurate enough to hit the bull's eye.
To improve the accuracy of the archer, he/she could practice aiming at the bull's eye, and focusing on form and technique. The archer could also get feedback from a coach or mentor to understand what might be causing the arrows to land away from the bull's eye.
On the other hand, the archer's precision is good, and this can be maintained by regular practice and fine-tuning the aim and form. The archer should aim to keep the consistency of the shots and keep the arrows close to each other.
Why energy efficiency is so important nowadays explain?.
With the rising cost of energy and the growing demand for electricity, energy efficiency has become increasingly important.
Finding ways to reduce electricity usage and increase efficiency can save money in the long run, while also having a positive impact on the environment.
There are a number of different methods to help increase energy efficiency, such as using energy-efficient appliances, making sure your home is properly insulated, and utilizing energy-saving strategies such as turning off lights and unplugging appliances when not in use.
Additionally, you can take advantage of energy-saving programs offered by local utilities, or even install renewable energy systems such as solar panels.
By taking steps to become more energy efficient, you can help reduce your energy bills, protect the environment, and ensure a sustainable future.
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Genetically-modified organisms (gmos) are currently being developed for agriculture. Currently commercialized gm crops in the u. S. Include soy (94%), cotton (90%), canola (90%), sugar beets (95%), corn (88%), and hawaiian papaya (more than 50%). The use of gmo crops can reduce agricultural costs to farmers and provide greater crop-yields, possibly helping with issues of food shortages. Although this sounds great, there is still a lot of controversy around the use of gmos. Which of these is a valid argument on why we should not use gmos in our food?.
Although this sounds fantastic, there is still a lot of debate around the usage of GMOs, and there are good reasons why they shouldn't be used in food, as suggested by Option D, because there isn't enough data on the long-term impacts of consuming GMOs.
What is the GMO debate about?The GMO debate centres on genetic material that has been purposefully altered using genetic engineering techniques for improved production, disease resistance, etc. It is unclear at this time whether these modifications are safe for ingestion by humans or the environment. Long-term study should be required for this because some studies have found GMO to be hazardous, such as causing diabetes, while others have found it to be beneficial.
Because there isn't enough data on the long-term effects of consuming GMOs, as Option D says, there is still a lot of controversy around the usage of GMOs and good reasons why they shouldn't be used in food.
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Complete Question -
Genetically-Modified Organisms (GMOs) are currently being developed for agriculture. Currently commercialized GM crops in the U.S. include soy (94%), cotton (90%), canola (90%), sugar beets (95%), corn (88%), and Hawaiian papaya (more than 50%). The use of GMO crops can reduce agricultural costs to farmers and provide greater crop-yields, possibly helping with issues of food shortages. Although this sounds great, there is still a lot of controversy around the use of GMOs. Which of these is a valid argument on why we should not use GMOs in our food?
A) GMOs do not have any nutritional value
B) GMO crops are always more expensive to buy
C) GMO crops are invasive and take over the habitat of local crops
D) there is not enough research on long-term effects of eating GMOs
2C2H2 (g) +502 (g) > 4C02 (g) + 2H20 (g)
How many liters of C2H2 react with
66.0 L of oxygen, assuming the
reaction is at STP?
2C2H2 (g) +502 (g) > 4C02 (g) + 2H20 (g), 90.8 L liters of C2H2 react with 66.0 L of oxygen, assuming the reaction is at STP.
What is oxygen?
Because oxygen contains only one type of atom, it is a chemical element, which is a type of substance. Since oxygen has an atomic number of 8, it is represented by the letter O in its formal chemical formula and has eight protons in its nucleus. In nature, molecular oxygen can be discovered.
What is reaction?
During a chemical reaction, one or more chemicals, sometimes referred to as reactants, are transformed into one or more new compounds, sometimes referred to as products. Both chemical components and elements are substances.
2C2H2 (g) +502 (g) > 4C02 (g) + 2H20 (g)
At STP, the molar volume is 22.7L
First, we must convert 52grams of acetylene into moles. Acetylene has a molar mass of 26.04g/mol. So here, there exist approximately
52g/ 26.04g/mol≈2 mol
.Now, we see that the mole ratio between
C2H2 is 2:4. So, 2 moles of acetylene will fully produce 4 moles of CO2
Since we also have 2 moles of acetylene, we produce 4moles of CO2. Remember at STP, the molar volume is 22.7L , and so the volume of carbon dioxide produce would be
4 mol. 22.7L/ 1 mol = 90.8 L
Therefore,2C2H2 (g) +502 (g) > 4C02 (g) + 2H20 (g), 90.8 L liters of C2H2 react with 66.0 L of oxygen, assuming the reaction is at STP.
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The corrosion of aluminum is cook wares is prevented as the aluminum metal reacts with the oxygen in the air, producing a protective coat of aluminum oxide. How many grams of aluminum oxide will react 25. 0 grams aluminum?.
216 grams of aluminum oxide will react 25. 0 grams aluminum
What Is Molar mass?
The mass in grams of one mole of a chemical is its molar mass. A mole is the measurement of the number of things, such as atoms, molecules, and ions, that are present in a substance. Any material has 6.022 x 1023 molecules in a mole.
Cookware made of anodized aluminum conducts heat just as effectively as cookware made of regular aluminum, but it has a firm, non-stick surface that makes it scratch-resistant, long-lasting, and simple to clean. Additionally, anodization lessens the amount of aluminum that leaches out of cookware and into foods, especially acidic foods like tomatoes and rhubarb.
4Al+3O2→2Al2O3
The number of moles of aluminium is 25/27 i.e. 0.93moles
4 moles of Al react with 3 moles of O2,
The mole ratio is 4:3.
So, we need (3/4)*0.93 mol= 0.69 mol of O2.
The molar mass of O2 (32 g/mol),
Required amount of oxygen will be 32*0.69g
2 moles of Al2O3 is produced by 4 moles of Al.
The mole ratio is 4:2 i.e. we need (2/4)*0.93 = 0.465 moles of Al2O3
102*0.465 = 216g of Al2O3 is needed.
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how many molecules are there in one mole of co2 gas?
One mole of carbon dioxide ([tex]CO_{2}[/tex]) contains 6.022×10^23 molecules.
This number is referred to as Avogadro's number and it is the same for any substance.
To put it another way, one mole of a substance is equal to 6.022×10^23 atoms, molecules, or other particles of that substance. In the case of [tex]CO_{2}[/tex], a one mole sample contains 6.022×10^23 molecules.
To explain further, when the number of molecules of a substance is known, the mass of that substance in grams can be determined.
The mass of one mole of carbon dioxide, [tex]CO_{2}[/tex] is 44.01g, which means that one mole of [tex]CO_{2}[/tex] contains 44.01g/6.022×10^23 molecules or 7.316×10^-23g/molecule. This is the average mass of a [tex]CO_{2}[/tex] molecule.
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arrange these species from fastest sn2 reaction rate to slowest sn2 reaction rate.Bank bromomethane 1-bromo-3-methylbutane 2-bromo-2-methylbutane 2-bromo-3-methylbutane
The SN2 reaction is a type of nucleophilic substitution reaction in which a nucleophile (Nu) attacks the carbon atom of a substrate (S) from the back side, causing the inversion of configuration and the formation of a new carbon-nucleophile bond.
How to arrange these species from fastest sn2 reaction rate to slowest sn2 reaction rate?The rate of the reaction depends on several factors such as the nature of the nucleophile, the substrate, and the leaving group. In general, the reaction rate increases as the nucleophile becomes more basic, the substrate becomes more polarizable and the leaving group becomes more weakly basic.The order of the reaction rate for the given species is:1-bromo-3-methylbutane > 2-bromo-2-methylbutane > 2-bromo-3-methylbutane > bromomethane1-bromo-3-methylbutane has the fastest reaction rate because it has the most stable carbocation intermediate, due to the presence of the methyl group, which inductively stabilizes the intermediate.2-bromo-2-methylbutane has a faster reaction rate than 2-bromo-3-methylbutane because it has the most stable carbocation intermediate, due to the presence of the methyl group, which inductively stabilizes the intermediate.2-bromo-3-methylbutane has a faster reaction rate than bromomethane because it has a more stable carbocation intermediate due to the presence of the methyl group, which inductively stabilizes the intermediate.Bromomethane has the slowest reaction rate because it has a less stable carbocation intermediate due to the absence of any methyl groups that would inductively stabilize the intermediate.It's important to note that the order is based on the stability of the carbocation intermediate, and not the nucleophile.To learn more about reaction rate refer:
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Do you think that the band of light rock i younger,older,or the ame age a the rock that that urround it?
The band of light rock is younger.
What rock has bands of light and dark minerals?
Granite is a type of rock that has bands of light and dark minerals. It is composed of two main minerals, quartz and feldspar, and can contain smaller amounts of othGranite is a common type of intrusive, felsic, igneous rock that is granular and phaneritic in texture. Granite is a common type of intrusive, felsic, igneous rock that is granular and phaneritic in texture. It is a very hard, durable rock that is resistant to erosion and weathering, making it a popular choice for construction and building materials. Granite is also popular for use in countertops, flooring, and other decorative applications.
The band of light rock is usually younger than the rock that surrounds it. This is because light rock is typically formed through a process of erosion, which requires time for the rock to wear away. On the other hand, the rock that surrounds the light rock is typically much older, often having been formed millions of years ago.
Hence, the band of light rock is usually younger.
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the smallest subatomic particle that makes up an atom, and carries a negative charge
Electrons are subatomic particles that are found in the energy levels swirling around the nucleus on an electron cloud and are negatively charged.
What is meant by nucleus ?
In terms of genomics, a nucleus is the organelle within a cell that is membrane-enclosed and houses the chromosomes.The nuclear membrane contains a variety of pores that allow specific chemicals to enter and exit the nucleus in different ways.The nucleus' principal jobs include storing the cell's DNA, preserving its integrity, and assisting with transcription and replication.DNA is organized into chromosomes in the nucleus, which is located in the center of the cell.It is referred to as the cell's controller because it oversees all of the cell's operations. Nuclear membrane, nucleoplasm, and nucleolus are the three primary components of the nucleus.To learn more about nucleus refer to
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A block of wood measures 3.00 cm x 2.00 cm x 5.00 cm and has a mass of 22.5 grams what is it ?
Determine quantitative density of a liquid whose mass is 62 g and whose volume is 31 mL. A block or wood with the dimensions 3 cm x 2 cm x 5 cm and a heft of 22.5 g (2 g/mL)
How do you calculate a block of wood's volume?
Result for an image A timber block weighs 22.5 grammes and has dimensions of 3 cm x 2 cm x 5 cm. What is that?
It is simple to determine the volume of such a block, prism, a cylinder by multiplying the base's area by the object's height or altitude.
How is block mass determined?
Multiply the volume and density together.
You may get the mass of your object by multiplying your two numbers together. You'll notice that you end up having units of mass if you keep track of both the units as you go along (kilograms or grams). A diamond, for instance, has a volume of 5,000 cm3 and a density of 3.52 g/cm3.
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Determine quantitative density of a liquid whose mass is 62 g and whose volume is 31 mL. A block or wood with the dimensions 3 cm x 2 cm x 5 cm and a heft of 22.5 g (2 g/mL)
How do you calculate a block of wood's volume?Result for an image A timber block weighs 22.5 grammes and has dimensions of 3 cm x 2 cm x 5 cm. What is that?
It is simple to determine the volume of such a block, prism, a cylinder by multiplying the base's area by the object's height or altitude.
How is block mass determined?Multiply the volume and density together.
You may get the mass of your object by multiplying your two numbers together. You'll notice that you end up having units of mass if you keep track of both the units as you go along (kilograms or grams). A diamond, for instance, has a volume of 5,000 cm3 and a density of 3.52 g/cm3.
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Cuanto tiempo demorara un competidor en recorrer 500 metros planos, avanzando a 5 m/s
The length of time it takes a competitor to cover a distance of 500 meters flat, the speed at 5 m/s is 100 seconds.
Speed is a quantity that indicates how fast an object is moving. The International Unit of Speed is m/s
Distance is a number that indicates how far an object changes position. The international unit of distance is the meter (m).
Time is the interval between two states/events, or it can be the duration of an event. Unit of Time seconds or seconds (s).
How to calculate the travel time, namely the distance traveled divided by the speed.
t = s/v
Formula Description:
s = Distance traveled (m, km)
t = Travel time (hours, seconds)
v = Speed (km/h, m/s)
Then the time needed is
t = s/v
t = 500m/ 5m/s
t = 100 seconds
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What is the molar mass of 2 moles of H2O?.
The molar mass of H₂O is 18 g/ moles, in 2 moles there are 36 g.
A substance's atomic mass is essentially the sum of the masses of its protons and neutrons. A molecule may contain more than one atom; in this case, the molecular mass is the sum of the masses of all the atoms in the molecule. Now, the unit is transformed into grams for the number of moles (g).
For instance, we all know that the atomic mass of oxygen is 16 g/moles, the molecular mass of Hydrogen is 1 g/moles
so the mass molar of H₂O is 16g/moles +2 (1 g/moles) = 18 g/ moles so in 2 moles of H₂O there are 36 g
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which size of micropipette would you select to deliver 215 microliters?
The size of micropipette that you would select to deliver 215 microliters would be a micropipette with a volume range of 200-1000 microliters.
What is a micropipette?
A micropipette is a laboratory instrument used to measure and dispense small volumes of liquid, typically in the range of microliters (µL) or nanoliters (nL). They are commonly used in chemistry, biology, and biochemistry experiments, as well as in clinical and industrial settings.
Micropipettes consist of a handle, a digital or manual volume adjustment mechanism, and a tip that is placed into the liquid to be dispensed. They work by creating a vacuum or positive pressure inside the tip, which draws or pushes the liquid out of the tip.
Micropipettes come in different volume ranges and it is important to select the right one to ensure accurate delivery of the desired volume. For example, a micropipette with a volume range of 2-10 microliters would not be suitable for delivering 215 microliters, while a micropipette with a volume range of 200-1000 microliters would be more appropriate.
It's also important to note that, even if the micropipette is able to deliver 215 microliters, you should always check the calibration of the micropipette before use, to make sure that it's delivering the correct volume.
Hence, a micropipette with a volume range of 200-1000 microliters is suitable to deliver 215 microliters.
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It is required to make 8 grams of certain chemical compound called z. This is made from compounds w, x, and y in the ratio of 2:1:3. The compound y is itself made from w and x. To make 6 grams of y requires 4 grams of w and 2 grams of x. How much w and x is required to make the required amount of z.
From the given data of chemical compounds, 5.32 grams of W and 2.66 grams of X are needed.
The following calculation must be done to determine how much W and X is needed to make the necessary amount of Z because it takes 8 grammes of a chemical compound called Z to make it, and Z is made from compounds W, X, and Y in the ratios of 2: 1: 3 and Y is itself made from W and X, and to make 6 grams of Y requires 4 grams of W and 2 grammes of X.
8/6 = 1.33
The resulting ratio is 2.66 : 2.33 :3:99.
3.99 = w
3.99 x 4/6 = 2.66
1.33 grams of X are equal to 2.66 grams of W.
2.66 x 2 = 5.32
1.33 x 2 = 2.66
5.32 grams of W and 2.66 grams of X are therefore needed.
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