Answer:
The mass number of an atom is the total number of protons and neutrons in its nucleus. The mass of the atom is a unit called the atomic mass unit (amu)
Why the small community of Mount Laguna, California, just 55 miles from San Diego much colder than San Diego ?
Answer: It all boils down to the two cities' proximity to the Pacific Ocean, along with wind currents and geographical location
Explanation: It is known throughout the whole scientific community that a body of water near a city produces very stable temperatures throughout the year with small dips. When it is summer, instead of San Diego boiling in the heat, the Pacific absorbs most of this heat, making the heat in the city tolerable (almost), this makes the ocean appear cold in the summer.
When it turns to winter, the heat absorbed by the ocean in the summer gets radiated making the cold in San Diego negligible. Applying this same logic to Mount Laguna, which is not near a body of water, it can be understood that it would have more extreme temp. swings.
Along with water, there is wind currents. I don't live in Mount Laguna, but I have to assume from the context you gave me that a cold wind current usually flows there, making it colder than in San Diego, which has a warm current.
The location also matters, if this town is under a valley, canyon, or mountain it could be under a shadow further decreasing the temp. more than San Diego.
Hopefully this helps, and good luck!
As the temperature of a gas at 500 K is changed to 380 K at constant pressure, will the
volume of gas increase, decrease, or remain the same? Explain why in terms of how the
molecules are moving.
The movement of atomic or molecular building blocks in a certain direction is referred to as molecular motion.
What makes the molecules move?The movement of atomic or molecular building blocks in a certain direction is referred to as molecular motion. Temperature and heat both have an impact on molecular mobility. This is so because the measurement of temperature, which reflects molecular motion and average kinetic energy, is used to determine molecular motion.
The atoms and molecules of a substance accelerate as it is heated. It doesn't matter if the substance is a solid, liquid, or gas; this still occurs. We'll attempt it with a liquid and a gas instead because it's harder to see it happen in a solid. See if you can identify the movement of molecules caused by heat.
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A general formula for a double-displacement reaction is written as:
General formula of double displacement reaction is:
AB + CD = AD + BC where AB and CD are the displaced reactants.
A double displacement reaction occurs when two reactants exchange ions to form two new compounds. Double displacement reactions usually result in the formation of a precipitate as a product.
Precipitate is typically formed as a result of a double displacement reaction.
The two types of bonds that exist between the reactants can be covalent on ionic in nature.
The other name for a double displacement reaction is salt metathesis reaction. It is an exchange reaction, or we can say a double decomposition reaction when one or more of the reactants does not dissolve in the solvent.
The simplest way to identify a double displacement reaction is to see if the cations exchanged anions with each other. If the states of matter are mentioned, look for aqueous reactants and the formation of a single solid product.
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a student begins the boiling point determination, for the oil bath they turn on the hot plates heat but forget to turn on the stirrer. what will happen?
The water is gonna heat up from the bottom up when you stir it, it lets the water heat up uniform.
In general, stirring helps in spreading of heat evenly in the mixture. the solid present inside disturb the evenness of heat in water. During the process of heating, an fundamental stream of bubbles or air is expelled and then, a little later, a rapid and continuous stream of bubbles emerges out of the inverted capillary tube. During this stage it stops heating. Very soon the stream of bubbles will slow down and stop.
If you will not stir the mixture the substance substance may get burned due to the high amount of heat supplied. Stirring can also be used when their is a need to mix the substance with a solvent properly.
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PLEASE HURRY!!
Question- Convert the 3.40 x 1022 formula units of table salt, NaCl, to its mass in grams.
Answers:
A. 0.0565 g NaCl
B. 58.4 g NaCl
C. 3.30 g NaCl
D. 6.02 g NaCl
To solve this we must be knowing each and every concept related to mole. Therefore, the correct option is option C among all the given options.
What is mole?A mole is merely a measuring unit. In reality, it is one of International System of Units' seven foundation units (SI). When basically determines are insufficient, new units are created.
Chemical reactions frequently occur at levels that use grams would be inappropriate, but using actual figures of atoms/molecules/ions would also be misleading.
It's much easier to write' mole' than '6.02x10²³' whenever you wish to refer to a huge number of things. That is essentially why and how this particular component was created.
number of mole =given number of atoms ÷ 6.022×10²³(Avogadro number)
number of atoms = 3.40 x 10²² atoms
number of mole=3.40 x 10²² ÷ 6.022×10²³
=0.056moles
mass of NaCl=0.056moles ×58.44
=3.27g
Therefore, the correct option is option C among all the given options.
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scientists have reached a key milestone in learning how to reverse aging
The given statement "scientists have achieved a core milestone in learning how to reverse aging" is true because scientific research has explored that lifestyle interventions, such as proper and healthy diet, supplements and exercise can reverse aging.
Scientific analyses reveal that lifestyle interventions, including proper diet, routine exercise, and supplements can reverse aging people. For instance, in one of the studies, people were put on a healthy diet, had to take certain supplements, and exercised. After eight weeks of following the plan, their epigenetic age was found to be reversed by almost two years.
Thus the given statement is true because it correctly specifies that scientists have achieved a key milestone to reduce aging.
"
Complete question
scientists have reached a key milestone in learning how to reverse aging
True
False
"
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How many mL of butane would you
add to hexane to make 750 mL of a
25.0% by volume butane solution?
In order to create a 750 mL solution that is 25.0% by volume butane, hexane must have 1.8891687657 mL of butane added to it.
How can the quantity of solute required to create a solution be calculated?Given that water has a density of 1 g/ml, the following equation can be used to determine how much solute need be added to create a solution with a weight percentage, grams of solute are calculated as follows (wt% solution) x (ml of water) (100 - wt% solution)
% of Volume, When a solute's volume and a solution's volume are both known, the concentration of the solution is expressed as a volume percent: Volume%=Volume of Solute The solution's volume is 100% Se.
Grams of solute are calculated as follows (wt% solution) x (ml of water) (100 - wt% solution).
Explanation:
(25% * 750)/(100 - 25%)
(0.25 * 750) / (100 - 0.25)
187.5 / 99.25 = 1.8891687657.
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Answer: 190
Explanation: 190/750 = 0.25333333333
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?
Answer: 10y/s
Explanation:
what is the limiting reagent when 16 grams of ch4 is reacted with 64 grams of o2? what remains after the reaction?
CH4 is limiting reagent and H20 remains after the reaction.
What is limiting reagent?A limiting reagent is a reactant that entirely consumes itself before any other reactants are used up in a chemical reaction, hence restricting the amount of product that may be created. It can be found by comparing the proportions of each component in the reaction and its stoichiometry. Once the limiting reagent has been determined, the amount of product that can be generated can be computed using the reaction's stoichiometry.
[tex]CH_4+2O_2- > CO_2+2H_2O[/tex]
number of moles of CH4= given mass/atomic mass
=> 16/16
so the number of moles of CH4 is 1
number of moles of O2 = 64/32
=2
so CH4 1 mole get vanished after the reaction and the gases like CO2 and O2 fly away so the limiting reagent is CH4
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A buffer is made by dissolving HC2H3O2 and NaC2H3O2 In water.
a) Write an equation that shows how this buffer neutralise added acid
b) Write an equation that shows how this buffer neutralises added base
A buffer is made by dissolving HC₂H₃O₂ and NaC₂H₃O₂ In water. The equation that shows how this buffer neutralise acid added is
H⁺ + CH₃COO⁻ ⇄ CH₃COOH. The equation that shows how this buffer neutralises added base is H⁺ +OH⁻ ⇄ H₂O
Processes of dissociation in the solution containing weak CH₃COOH acid and its salt:
CH₃COOH ⇄ H⁺ + CH₃COO⁻ Ka = 1.8 X 10⁻⁵
CH₃COONa ⇄ Na⁺ + CH₃COO⁻
At addition of acid in solution ions of hydrogen comunicate in weak acid:
H⁺ + CH₃COO⁻ ⇄ CH₃COOH.
At addition of the basis in solution ions of hydroxide comunicate in weak electrolyte - water: H⁺ +OH⁻ ⇄ H₂O
Therefore, the equation that shows how this buffer neutralise acid added is H⁺ + CH₃COO⁻ ⇄ CH₃COOH. The equation that shows how this buffer neutralises base added is H⁺ +OH⁻ ⇄ H₂O
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Determine where each type of cleaning solution should be discarded after use.Water used to rinse detergent out of a flask _____ sink or waste containerSolvet used to rinse chemicals out of a beaker_____ sink or waste containerAcid solution used to clean a crucible___________ sink or waste container
Water used for washing purposes can be discarded into the sink as it does not affect the water pollution.
But in the case of organic solvent and acid solution they can be discarded into waste containers for proper disposal.
As we know that organic solvent and acid solution are hazardous for aquatic life. Their discopsal is a major concern.
What is water?
Water, a substance composed of the chemical elements hydrogen and oxygen and existing in gaseous, liquid and solid states. It is one of the most abundant and basic compounds. At room temperature, the tasteless and odorless liquid has an important ability to dissolve many other substances.To know more about water, click the link given below:
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What is temperature?
A. Electromagnetic waves
B. The measure of an object's "hotness"
OC. A type of heat transfer
D. The energy transferred between objects
Answer:
the measure of an object s hotness
Which of the following is reduction reduction reaction? A. 2Mg(s)+O2→2Mg(s)B. S(s)+O2(g)→SO2(g)C. 2HgO(s)→2Hg(l)+O2(g)D. Mg(s)+S(s)→MgS(s)
The reduction reaction is given as :
2Mg + O₂ ---> 2MgO2HgO ----> 2Hg + O₂Mg + S ---> MgSThe reduction reaction is the reaction in which the addition of the hydrogen takes place and the addition of the electropositive element and the removal of the oxygen or any of the electronegative atom.
The reduction reaction is given below as :
2Mg + O₂ ---> 2MgO2HgO ----> 2Hg + O₂Mg + S ---> MgSThe gain of the electron is also called as the reduction reaction. The one which is reduce will acts as a oxidizing agent.
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When a student squeezes a balloon, it changes shape. In which state of matter is the substance inside the balloon?
A. It could be either a liquid or a gas, because these states can change shape.
B. It could only be a liquid, because only liquids can change shape
C. It could only be a gas, because only gases can change shape.
D. It could not be a liquid or a solid, because neither of these states can change shape.
which size of micropipette would you select to deliver 215 microliters?
A micropipette of size P1000 (can read upto 1ml) would be required or selected to deliver or transfer 215 microliters of liquid.
A micropipette is an instrument used to transfer small amounts (<= 1 ml) of liquids. The scales on a micropipette are in microliters (1000µl = 1 ml). These are very delicate and expensive instruments costing between $150-300 a piece. These instruments come in three sizes which are capable of pipetting three ranges of volumes:
P20 type can transfer liquids between the range of 5- 20 µl,
P200 type can transfer liquids between the range of 20-200 µl, and
P1000 type can transfer liquids between the range of 200-1000 µl.
These instruments are used in conjunction/simultaneously with disposable and often sterile plastic tips.
A fixed volume micropipette is a pre-set instrument to measure only a specific volume. Although the volume transferred/delivered by a given pipet cannot be changed, this pipet is operated analogously to the variable micropipette. A fixed volume micropipette often does not have a tip ejector button, so the tips are to be removed manually while the required steps of the process.
It is of utmost importance to use the correct pipettor available for the volume that is to be dispensed. As going below or above the range provided for a micropipette, may damage the instrument.
Thus, a micropipette of type P1000 only should be used to deliver any liquid of volume 215 microliters.
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5xy=9
15x3y=27 Determine if the following ytem of equation ha no olution, infinitely many olution, or exactly one olution
The equations will have only one solution.
The y-coefficients are opposites, so you can eliminate the y-variable by adding the equations:
(2x -y) + (3x +y) = (2) + (-6)
5x = -4
x = -4/5 = -0.8
Substituting this into the second equation, we have ...
3(-0.8) +y = -6
y = -3.6 . . . . . . . add 2.4 to both sides
The solution is (x, y) = (-0.8, -3.6).
What is an equation?
The word equation and its cognates in other languages can have subtly different meanings; for example, in French, an equation is defined as containing one or more variables,To know more about equations, click the link given below:
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How would I balance this?
The balanced chemical equation is as follows:
4KClO₃ ₍s₎ ⇒ 3KClO₄ ₍s₎ + 3KCl
What is balance chemical equation ?The term balanced chemical equation is defined an equation where the number of atoms of each type in the reaction is the equal on both reactants and product sides.
The chemical equation must be balanced in order to obey the law of conservation of mass. When the number of different atoms of elements in the reactants side equals the number of atoms in the products side, the chemical equation is balanced.
Thus, The balanced chemical equation is as follows:
4KClO₃ ₍s₎ ⇒ 3KClO₄ ₍s₎ + 3KCl
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one mole of magnesium has the same number of atoms as one mole of lithium. True/False ?
Rank these acids according to their expected pKa values.ClCH2COOHClCH2CH2COOHCH3CH2COOHCl2CHCOOH
The expected pKa values of the acids listed, in increasing order, are:
Cl2CHCOOH < ClCH2COOH < CH3CH2COOH < ClCH2CH2COOH
The pKa value is a measure of the acidity of a substance and is defined as the negative logarithm of the acid dissociation constant (Ka). A lower pKa value indicates a stronger acid, as it dissociates more readily in water to release hydrogen ions.
The alkyl chain length and the presence of functional groups can influence the pKa value of an acid. In this case, the longer the alkyl chain, the higher the pKa value.
Therefore, The expected pKa values of the acids listed, in increasing order, are:
Cl2CHCOOH < ClCH2COOH < CH3CH2COOH < ClCH2CH2COOH
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According to the law of conservation of mass, which statement about chemical reactions is always true?(1 point)
Responses
The number of molecules in the reactants is the same as the number of molecules in the products.
The number of molecules in the reactants is the same as the number of molecules in the products.
The number of substances in the reactants is the same as the number substances in the products.
The number of substances in the reactants is the same as the number substances in the products.
The number of atoms of each element in the reactants is the same as the number of atoms of each element in the products.
The number of atoms of each element in the reactants is the same as the number of atoms of each element in the products.
The states of the substances in the reactants is the same as the states of the substances in the products.
According to the law of conservation of mass, Statement A. The number of atoms of each element in the reactants is the same as the number of atoms of each element in the products is true about chemical reactions.
What is the law of conservation of mass?The law of conservation of mass is a model indicating that matter cannot be created or destroyed, but it can be changed from one form to another.
Therefore, with this data, we can see that the law of conservation of mass indicates that the total mass of the system or number of atoms remains constant over time.
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After a recrystallization, a pure substance will ideally appear as a network of?
When observed under a microscope, an impure substance is a non-homogeneous mixture in which some components have various colours or textures.
A process called recrystallization is used to clean an impure chemical in a solvent. The idea put forward here is that as temperature rises, most solids become more soluble. The process of fractional crystallisation is also known as recrystallization. A pure substance should ideally show up as a network of big crystals after recrystallization. If not, it might be beneficial to reheat the flask and let the contents cool more gradually. The appearance of the pure substances is homogenous A homogeneous combination (a pure substance) manifests as regularity. For example, a pure substance will have the same colour or texture on all sides, regardless of its size, when viewed. Steel and pure water are two examples of pure things.
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What did I do wrong and how would I do this correctly?
The mass of the hydrogen gas produced is equal to 0.368 g, not 0.322 this is wrong mass .
The reaction between calcium and water yields the following balanced chemical equation: 2 Ca + 2 H₂O → 2 CaOH + H₂
Given :that the mass of calcium is 14.7 g,
the number of moles of calcium is 14.7/40, which equals 0.3675 mol.
The number of moles of water is 11.5/18, which equals 0.638 mol.
Two moles of calcium react with two moles of water.
Calcium is therefore a limiting reagent.
What is the chemical equation?The mass of 0.1838 mol of hydrogen gas is 0.368 g, and 0.3675 mol of Ca produces hydrogen gas. A balanced chemical equation is one in which both sides of the equation have the same number of atoms.
In chemistry, what is a limiting reagent?The reactant that is consumed first in a chemical reaction, also known as the limiting reagent, limits the amount of product that can be produced.
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29. Identify which is a property of nonmetals *
good insulator
good conductor of electricity
have luster
Omalleable
(2 Points)
Answer:
Omalleable
Explanation:
Non-metals are very brittle, and cannot be rolled into wires or pounded into sheets. Conduction: They are poor conductors of heat and electricity. Luster: These have no metallic luster and do not reflect light.
what effect does the coriolis effect have on global winds?
The Earth's rotation means that we experience an apparent force known as the Coriolis force. This deflects the direction of the wind to the right in the northern hemisphere and to the left in the southern hemisphere.
What is coriolis force?
The Coriolis effect describes the deflection pattern of objects that are not firmly attached to the ground as they travel long distances around the Earth. This effect is responsible for many large-scale weather patterns.The key to this effect lies in the Earth's rotation. Specifically, the Earth rotates faster at the equator than at the poles.To know more about ccoriolis force, click the link given below:
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Soil erosion is a problem that is caused by many different factors. What can humans do to prevent soil erosion? To address this question, first think locally. What industries and businesses in your area may contribute to the erosion problem? What could be done to reduce these contributions? What happens in your state? What happens in your country? Once you have ideas about what can be done, who should be responsible for carrying out these actions? Should the government regulate these activities? Should individual companies take responsibility?
humans can prevent soil erosion by planting shrubs and grass, adding rocks to the ground and Constructing retaining walls.
What is soil erosion?Erosion is a surface process that involves the removal of soil, rock, or dissolved material from one area on the Earth's crust and the subsequent transport and depositing of the material at a different location. Weathering doesn't involve movement, unlike erosion, which does.
The two main drivers of erosion, wind and water, can easily carry bare soil away. While their leaves deflect rain and prevent it from tearing the earth apart, plant roots retain the soil together. this is why planting shrubs and cover crops is very important in preventing soil erosion.
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The positively charged center of the atom consisting of protons and neutrons is called
A sample of gas has a volume of 2.0 L at a temperature of 0°C. When the volume is
increased to 4.0 L at constant pressure, what is the new temperature?
This is an illustration of Boyle's law, which states that when mass and temperatures are held constant, a gas's volume changes inversely with pressure at 0.05 atm.
What is the fundamental idea behind Boyle's law?According to Boyle's law, pressure and volume of a gas are always inverse proportion at a specific temperature. It states that the pressure inside the lung will drop as the size of the lungs expands during inhalation.
Which scenario best illustrates Boyle's Law?When you inflate your bicycle tires, you can see how Boyle's Law is used in practice. The gasses inside a tire are squeezed and crammed closer together when air is pumped into it. This raises the gas's pressure, and It starts to press up against the tire walls.
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please help me!!!! 26 pointz
Answer:
Electron = negative; Proton = positive; Neutron = no charge
Explanation:
Why i carbon an element and not a compound?
All carbon atom have the ame number of proton. Carbon bond eaily with oxygen, but not helium. Carbon i found in all living organim. All carbon atom have the ame number of electron
Carbon is an element and not a compound because a) all carbon atom have the same number of protons.
Carbon is an element and not a compound because all of its atoms have the same number of protons.
This unique characteristic sets it apart from compounds, which are made up of two or more different types of atoms.
Carbon's atomic structure is composed of a nucleus surrounded by electrons and protons.
The nucleus is made up of protons and neutrons, and the protons determine the element's identity. Because all carbon atoms have six protons, they are all the same element.
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which of these minerals would be the main component in the cement slab in your house?
The main component in a cement slab in a house is typically Portland cement.
Key points:
Portland cement is a type of hydraulic cement that is commonly used in the construction of buildings, bridges, roads, and other structures.It is made by heating a mixture of limestone and clay to high temperatures, a process known as calcination.The resulting material is ground into a fine powder, which can be mixed with water, sand, and gravel to form concrete.The concrete is then poured and leveled to form the slab.The cement reacts with water to form a paste that binds the other materials together, creating a strong and durable building material.Portland cement is also used in other types of construction, such as in the production of mortar and stucco.Other types of cement such as blended cement can be used too, depending on the requirement and the availability of the raw materials.Learn more about cement slabs here:
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