Answer:
[tex]\boxed {\boxed {\sf 2.73 \ g \ He}}[/tex]
Explanation:
We are asked to find the mass of helium gas given a volume.
1. Convert Liters to Moles1 mole of any gas occupies a volume of 22.4 liters. So, 1 mole of helium gas contains 22.4 liters of helium. Create a ratio using this information.
[tex]\frac {1 \ mol \ He }{ 22.4 \ L \ He}[/tex]
We are converting 15.3 liters of gas to moles, so we multiply by that value.
[tex]15.3 \ L \ He *\frac {1 \ mol \ He }{ 22.4 \ L \ He}[/tex]
The units of liters of helium (L He) cancel.
[tex]15.3 *\frac {1 \ mol \ He }{ 22.4}[/tex]
[tex]\frac {15.3}{22.4} \ mol \ He[/tex]
[tex]0.6830357143 \ mol \ He[/tex]
2. Convert Moles to GramsThe molar mass is the mass of 1 mole of a substance. These values are found on the Periodic Table as atomic masses, but the units are grams per moles. Look up the molar mass of helium.
He: 4.0026 g/molCreate another ratio using the molar mass.
[tex]\frac {4.0026 \ g \ He}{1 \ mol \ He}[/tex]
Multiply by the number of moles we calculated.
[tex]0.6830357143 \ mol \ He *\frac {4.0026 \ g \ He}{1 \ mol \ He}[/tex]
The units of moles of helium (mol He) cancel.
[tex]0.6830357143*\frac {4.0026 \ g \ He}{1 }[/tex]
[tex]2.73391875 \ g \ He[/tex]
3. RoundThe original measurement of volume has 3 significant figures, so our answer must have the same.
For the number we calculated, that is the hundredths place.
The 3 in the thousandths place to the right (2.73391875) tells us to leave the 3 in the hundredths place (2.73391875).
[tex]2.73 \ g \ He[/tex]
15.3 liters of helium gas is approximately 2.73 grams of helium.
Define symbol and compound with an exomple.
What produces the large amount of energy released by a nuclear reaction?
A. the "disappearance" of a small number of electrons.
B. the "creation" of a small amount of mass.
c. the "disappearance" of a small amount of mass.
D. the "creation" of a small number of electrons.
Answer: C the “disappearance” of a small amount of mass.
Explanation:
Determine the mass in grams of 3.60 mol of H2 SO4
Answer:
Explanation:
There are 353 grams of H2SO4 in 3.60 moles of H2SO4.
Consider two gases, A and B, which are in a container at room temperature. What effect will the following changes have on the rate of the reaction between these gases?
The temperature is decreased at a constant volume.
A. Increase
B. Decrease
Answer:
A. The rate of reaction will increase or go up
B. The rate of reaction will decrase or go down.
Explanation:
Increasing the temperature will make the gas particles move faster. Faster movement will increase rate of collision between particles to cause a reaction. Decreasing the temperature will cause the opposite to happen.
distinguish between sugar and non-sugar with examples.
Answer:
Reducing sugars are sugars where the anomeric carbon has an OH group attached that can reduce other compounds. Non-reducing sugars do not have an OH group attached to the anomeric carbon so they cannot reduce other compounds. ... Maltose and lactose are reducing sugars, while sucrose is a non-reducing sugar
Wich one is it - this is biochemistry
Answer:
O=O is not a compound; it's a molecule.
Answer:
it is O double bond
Explanation:
because it is not attached with another different molecule like Hydrogen Carbon Sulfur etc. H2O or CO2(these are compounds)
PLZ HELP ME WITH MY WORK
Which is an example of using a physical model to represent an earthquake?
O A. Using a computer to measure what happens during an earthquake
O B. Thinking of an earthquake as someone jumping on the bed next to YOU
C. Calculating the movement of the ground during an earthquake
O D. Shaking a cake that has models of buildings on it SUBMIT
Answer:
D. Shaking a cake [...]
Explanation:
None of the rest are actual physical models representing earthquakes.
Hope that's right! :D
Một hỗn hợp A gồm nahco3, na2co3, k2co3 có khối lượng 46,6 g chia A làm 2 phần bằng nhau Phần 1: tác dụng với dung dịch CaCl2 dư thu được 15 gam kết tủa Phần 2 :tác dụng với dung dịch ca(oh)2 ư thu được 20 gam kết tủa Tính khối lượng mỗi muối trong hỗn hợp A
Answer:
anA IL
Explanation:
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What is reduced in the reaction below?
2H2 + 02 → 2H20
A. H20
B. 02
C. Reduction does not occur.
D. H2
SUBMIT
Answer:
[tex]{ \underline{ \sf{O _{2} \: is \: reduced}}}[/tex]
Explanation:
Reduction means when a reactant loses oxygen or gains hydrogen.
In the equation:
Hydrogen molecule, it neither gains nor loses hydrogen, but it gains oxygen. so :
[tex]{ \sf{H _{2} \: is \: excluded}}[/tex]
Oxygen molecule loses one oxygen atom, and gains four hydrogen atoms, hence it is reduced.
what is the gram formula of na2co3
Answer:
106 gfm
Explanation:
element. number masses
Na. 2 23×2
C. 1. 12
O. 3. 16×3
then add
106 gfm
The elements in groups 1A, 6A, and 7A are called, __________, respectively. Group of answer choices alkaline earth metals, halogens, and chalcogens alkali metals, chalcogens, and halogens alkali metals, halogens, and noble gases alkaline earth metals, transition metals, and halogens halogens, transition metals, and alkali metals
Answer:
1A Alkali Metals
6A Chalcogens
7A Halogens
Answer:
alkali metals, chalcogens, halogens
Explanation:
Group 1A is alkali metals
Group 6A is chalcogens
Group 7A is halogens
How many g of water are required to be mixed with 11.75 g of HgCl in order to make a 0.01 m solution? (Refer to the periodic table for atomic weights.)
a.) 40 g
b.) 5,000 g
c.) 2 x 10^8 g
d.) 2 x 10^6 g
The general name for a substance added to a reaction that affects the rate but is not consumed in the reaction is called a_____.
a.)constituent
b.)catalyst
c.)complex
d.)reactant
The action of a catalyst can be explained in the following manner:
a.) The catalyst makes it possible for the reaction to take place by another path that makes possible reaction at a lower energy.
b.) The catalyst takes no part in the reaction but serves as a buffer between reactants and products.
c.) The catalyst prevents the reverse reaction.
d.) The catalyst lowers the temperature of the reactants.
The energy level necessary to enable a reaction to occur is called the_____ energy.
a.) potential
b.) kinetic
c.) activation
d.) nuclear
Raising the temperature of a reacting system increases the rate of the reaction, but does NOT increase the:
a.) number of collisions
b.) average velocity of the reacting particles
c.) activation energy
d.) vibrational motions within the molecules
e.) fraction of the reacting particles which possess energies greater than the activation energy
Answer:
5,000 g
b.)catalyst
The catalyst makes it possible for the reaction to take place by another path that makes possible reaction at a lower energy.
activation
activation energy
Explanation:
Formulae for molality = number of moles of solute/mass of solvent in kilograms
Number of moles of solute= 11.75g/236 g/mol = 0.0498 moles
0.01 = 0.0498/x
x= 0.0498/0.01
x= 5 Kg or 5000 g
A catalyst refers to any substance that alters the rate of reaction but remains unaffected at the end of the reaction. The catalyst lowers the activation energy of a reaction.
For a chemical reaction to occur, the substances participating in that reaction must possess energy which is greater than the activation energy of the reaction. The activation energy is a sort of energy barrier between reactants and products which must be surmounted before a reaction can take place.
When the temperature of a reaction system is raised, the molecules move faster and the number of effective collisions in the system increases. However, raising the temperature does not raise the activation energy of the system.
1. In regards to curly hair, which of the following statements
are TRUE? (select 2 answer choices).
A. Curly hair develops over time. It is not acquired at birth.
B. Curly hair can lead to harmful mutations in the body.
C. Curly hair results from a change in the gene that
codes for hair structure.
D. People with curly hair have different hair protein structures than people with
straight hair.
Answer here:
Answer:
A and D are the answers
Explanation:
the other two don't make sense
The statements C and D are correct, i.e., curly hair have different protein structure from straight hair and curly hair results from a change in the gene.
What is protein?Proteins are biomolecules made of amino acids. Proteins are very essential to all living things and contributes the body structure. Proteins are mainly up taken through diet and they are the main source of energy.
Hair is made of keratin protein. Keratin makes up our skin and nails too.Curly hair is originating by birth not developing over time. Curly hair is more likely to be occurring through inheritance.
The protein structure the hair follicle is some more bend for curly hair. Curly hair and straight hair originates from different gene traits. The gene type is inherited from the parents.
Hence, for people with curly hair have different protein structure and it result from a change in gene that code for hair structure. Thus options C and D are correct.
To learn more about proteins, refer the link below:
https://brainly.com/question/2193769
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Which statement best describes redox behavior in an electrochemical cell?
Electrons are produced at the copper rod.
Electrons flow from cathode to anode.
Reduction occurs at the zinc electrolyte.
Charges are balanced during redox.
Answer:
The last one
Explanation:
Charges are balanced in a redox reaction
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Write the word equation for each of the following metal oxidation reactions also the chemical equations below it.
1) Osmium reacts with oxygen in the air to form a highly toxic chemical called osmium oxide
+=
+=
Answer:
Solid Osmium transition metal reacts with Oxygen gas to produce solid Osmium tetroxide.
Os(s) + 2O₂(g) -> OsO₄(s)
Explanation:
Osmium tetroxide is another way of writing Osmium (VIII) oxide.
Leaving powdered osmium exposed to air in a room will slowly create osmium tetroxide at room temperature.
Similarly, osmium tetroxide vapor will readily be released from a liquid solution at room temperature.
Sodium is dissolved under kerosene oil or paroffin to protect it from the air. 3) State. Huckle's rule for aromaticity with example. How does benzene react with Chlorine in presense of Sun light
Answer:
His rule states that if a cyclic, planar molecule has 4n+2 π electrons
What is required for dynamic equilibrium?
A. A closed system.
B. The forward and backward reactions occur under the same conditions.
C. A reversible reaction.
D. All of these
Answer:
A. all of them
Explanation: Edtell
"Every action force creates a reaction force that is equal in strength and opposite in direction." This statement summarizes Newton's
Answer: Newton's Third Law of Motion.
Explanation:
Newton's Third Law of Motion simply states that every action force creates a reaction force and then, this reaction force will be equal in strength and opposite in direction.
The statement simply implies that in every interaction, there will be a pair of forces that is acting on the two interacting objects. An example of Newton's third law of motion can be seen when a person jumps, thenlegs of the person will apply a force to the ground which will then propel the person into the air.
What is the purpose of a catalyst in the production of hydrogen?
Select the correct answer.
- to increase the rate at which water molecules decompose
- to decrease the amount of oxygen produced
- to decrease the temperature of the reaction
- to increase the activation energy of the reaction
The purpose of a catalyst in the production of hydrogen is to increase the rate at which water molecules decompose.
What is a catalyst-A catalyst is a substance that increases the rate of a chemical reaction without itself being consumed or produced during the reaction. As a result, catalysts assist in speeding up chemical reactions while also decreasing the amount of energy needed for the reaction to occur. In hydrogen production, catalysts are used to speed up the decomposition of water into hydrogen and oxygen. The use of catalysts lowers the activation energy required for the reaction to occur, resulting in a faster reaction rate and lower operating temperatures.What is the process of hydrogen production?Hydrogen production has various methods, and one of the most commonly used methods is water electrolysis. In this method, water molecules are split into hydrogen and oxygen using an electric current passed through an electrode. Water is broken down into hydrogen and oxygen during the process, with the assistance of a catalyst. During this process, a catalyst like platinum or nickel is employed to speed up the chemical reaction of water decomposition.
When an electric current is applied to the catalyst, water molecules are broken apart, releasing hydrogen and oxygen atoms.Catalysts lower the activation energy of the reaction, allowing it to occur faster than it would otherwise. In hydrogen production, catalysts are crucial since they enable the reaction to occur at a lower temperature, reducing energy consumption and minimizing operating costs. As a result, the use of catalysts is essential to the production of hydrogen.
for such more questions on catalyst
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57:17
A ball that has a mechanical energy of 65 J has 12 J of kinetic energy. The ball has blank
energy.
J of potential energy
Answer:
53 Joules
Explanation:
Applying the law of conservation of mechanical energy.
Law of conservation of mechanical energy: States that energy although, energy can not be transformed from one form to another, the total energy of the system remain the same.
I.e,
Mechanical Energy = E.K+P.E..................... Equation 1
Where E.K = Kinetic energy, P.E = Potential energy.
From the question,
Given: Mechanical energy = 65 Joules, K.E = 12 J
Substitute these values into equation 1 and solve for P.E
65 = 12+P.E
P.E = 65-12
P.E = 53 Joules
3 point different between reactant and product
Answer:
reactants
The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction
Explanation:
product_The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction. In the equation above, the zinc and sulfur are the reactants that chemically combine to form the zinc sulfide product.
There is a standard way of writing chemical equations. The reactants are all written on the left-hand side of the equation, with the products on the right-hand side. An arrow points from the reactants to the products to indicate the direction of the reaction:
reactants → products
Reactants
1. The substances used as starting materials and which react with one another are reactants.
2. Example: In this reaction Mg and O2 are reactants.
Products
1. The substances which are formed as a result of reaction are products.
2. Example: In this reaction MgO is a product.
how many protons electrons and neutrons are present in the following atoms
Answer:the element is potassium
the proton and electron is 19 and the nuetron is 19
Explanation:
Answer:
The atomic number gives the number of protons 19
p = 19
The atomic mass is the sum of the protons and neutrons
p+n = 39 p = 19
Put p into the equation and solve for n the neutrons
19+n = 39
Subtract 19 from both sides
19-19+n = 39-19
n = 20
The number of electons equal the number of protons in a neutral atom. The positive charge equal to the negative charge. The negative charge is the number of electons. This ion has a charge of +1. So solve for the negative charge.
-19+1 = -18
The negative charge is -18 so
e = 18
PLEASE URGENT HELP!! 30 POINTS!!!!!!
Answer:
CH³–C=CH——CH³–CH=CH²
Explanation:
THIS IS PROPYNE TO PROPENE
describe two ways in which gases are similar to liquids in properties
Answer:
they have weak intermolecular forces
A sample of oxygen gas occupies a volume of 160 liters at 364 K. What will be the volume of the gas when the temperature drops to 273 K?
210 L
120 L
62 L
470 L
Answer:
62L
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tysm.
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hope it help
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Resources found in lithosphere: gold and iron etc
Resources found in atmosphere: Water vapor, gases etc.
Can someone do these? Brainliest included
Answer:
Explanation:
6. p⁺ e⁻
Ca²⁺ 20 18
F⁻ 9 10
O²⁻ 8 10
Na⁺ 11 10
7. Physical properties of matter are properties that can be measured or observed without matter changing to an entirely different substance. These include odor, boiling point, melting point, density, electrical conductivity and heat conductivity.
Separation of mixture:
Chromatography involves solvent separation on a solid medium.
Distillation takes advantage of differences in boiling points.
Evaporation removes a liquid from a solution to leave a solid material.
Filtration separates solids of different sizes.
Funnel partitioning with solvents. Solvent dissolves one component but not the other.
8.Bulk Elements => Carbon, Hydrogen, Oxygen, Nitrogen, Sulfur & Phosphouous
Microminerals are those minerals needed in less than 100 mg quantities. Trace minerals or trace elements are usually needed in microgram quantities. Microminerals include iron, zinc, copper, iodine, fluoride, chromium, cobalt, selenium, manganese, and molybdenum.
Diatomic Molecules => H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂
9. Electron Configurations
Na: 1s²2s²2p⁶3s¹ => valence = 3s¹
N: 1s²2s²2p³ => valence = 2s²2p³
Al: 1s²2s²2p⁶3s²3p¹ => valence = 3s²3p¹
Valence is the highest principle quantum number (or, principle energy level ~ ring) in the electron configurations.
10.moles of glucose = 450g/180.16 g/mol =2.50 moles
C₂H₆O₂ = 2(12) + 6(1) + 2(16) = 24 + 6 + 32 = 62 g/mole
Two unknown white, lustrous minerals were tested for hardness and streak. Both had a hardness of 4, and had a white streak. What can you conclude from these tests?
Answer: Fluorite
Explanation: Minerals are naturally occurring inorganic materials with definite chemical compositions and definite physical properties. Hardness and Streak are both physical characteristics used in identifying minerals. The colour of a mineral’s powder defines its streak (it does not change from mineral to mineral) and a streak of white shows that such mineral has a calcium fluoride making it a fluorite. To check streak, one simply scrapes the mineral across an unglazed porcelain plate.
Hardness on the one hand, is the resistance to cutting, scratching, abrasion or indentation of minerals. Mineral hardness is specified by the Mohs hardness scale when working with hand samples, and the scale ranges from 1 (very soft like talc) to 10 (as hard as diamond). A hardness of 4 also put such mineral into the fluorite range indicating that it is harder than calcite, but softer than feldspar.
In conclusion, the tests show that the mineral in question is a fluorite.
What is consciousness? ...
Answer:
Consciousness refers to your individual awareness of your unique thoughts, memories, feelings, sensations, and environments. Essentially, your consciousness is your awareness of yourself and the world around you. This awareness is subjective and unique to you.
Explanation:
In the reaction at Blood Falls, iron and oxygen combine to form iron oxide, which is called rust (water is also present). The reactants are
, and the product is
Answer:
The reactants for rust are iron ,water and oxygen while the products are hydrated iron oxide
Explanation:
4Fe+3O2+2H2O---->2Fe2O3.H2O
