Ammonia gas occupies a volume of 450. mL at a pressure of 720. mm Hg. What volume will it occupy at standard pressure?
Show your work Please!!!!

Answer: d. You would decrease the pressure

Explanation:

If the temperature of a gas is held constant, the pressure and volume vary inversely.

If the gas's temperature remains constant, then increase the volume of the gas with a decrease in the pressure. Therefore, option (D) is correct.

Boyle’s law can be described as at a constant temperature, the pressure exerted by a given mass of gas being inversely proportional to the volume occupied by the gas.

The pressure and volume of a gas at a particular temperature have an inverse relationship.

P ∝ 1/V

or   P₁ .V₁ = P₂. V₂                                                             ................ (1)

Where the initial and final pressure of the gas is P₁ and  P₂ respectively.  The initial and final volume of the gas is V₁ and  V₂ respectively at temperature 'T'.

Therefore, if we keep the temperature of the gas constant. them the volume of the gas will increase only if we decrease the pressure of the gas.

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The reaction order is given as the  relationship between the concentrations of the reactants and the rate of a reaction.

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Answer:

C=8,H=8 and O =3

Explanation:

As the formula is given.

In catalysis and base catalysis, a chemical reaction is catalysed by an acid or a base.

Covalent catalysis involves the formation of a covalent bond.

Metal ions contribute to the catalytic process through their ability to attract or donate electrons.

An enzyme is a biological catalyst and is almost always a protein. It speeds up the rate of a specific chemical reaction in the cell.

In catalysis and base catalysis, a chemical reaction is catalysed by an acid or a base. by Bronsted - Lowry acid-base theory, the acid is the proton ( hydrogen ion, H+) donor and a base is the proton accentor typical reaction catalyzed by proton transfer are esterifications and aldol reactions .

Covalent catalysis involves the formation of a covalent bond between the enzyme and at least one of the substrates involved in the reaction. Often times this involves nucleophilic catalysis which is a subclass of covalent catalysis.

Metal ions are essential for the catalytic action of some enzymes. Metal ions contribute to the catalytic process through their ability to attract or donate electrons. Some metals bind the substrate by coordination links. Others contribute to maintaining the tertiary and quaternary structures of the enzyme molecule.

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The conclusion that is consistent with the ionic equation would be that COS (s) is a precipitate.

It is a reaction in which 2 soluble salts in aqueous forms react to produce an insoluble salt as one of the reaction's products.

Precipitate products are usually insoluble and can be filtered off using suitable filter paper. In other words, they are solids that are suspended in solution.

Following the ionic reaction, the two reacting ions are in aqueous forms while the product formed is solid.

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Answer:

I would say there would be 5-10% in a city, and maybe 10-20% in the country. It mainly varies depending on how big the city is, how many people/districts there are, and the size of the country, which makes it hard to give a certain percent of shops, as there may be small businesses included as well or new shops being built.

Hope this helps! This was pretty confusing for me as well so i hope the answer is alright (×﹏×)

Answer:

4.5 moles H₂O

       or

81.072 g H₂O

Explanation:

I am not exactly sure whether you want moles H₂O or grams H₂O. So, I'll calculate both. To find the moles H₂O, you'll need to covert moles C₈H₁₈ to moles H₂O via the mole-to-mole ratio from the reaction coefficients. To find the grams H₂O, you need to convert moles H₂O to grams H₂O via the molar mass.

2 C₈H₁₈ + 25 O₂ ---> 16 CO₂ + 18 H₂O

0.5 mole C₈H₁₈          18 moles H₂O
-----------------------  x  -------------------------  = 4.5 moles H₂O
                                  2 moles C₈H₁₈

Molar Mass (H₂O): 2(1.008 g/mol) + 16.00 g/mol

Molar Mass (H₂O): 18.016 g/mol

4.5 moles H₂O         18.016 g
----------------------  x  ----------------  =  81.072 g H₂O
                                  1 mole

a) Alpha decay occurs when an unstable nuclide emits an alpha particle, (which is just a helium-4 atom), which contains 2 protons and 4 neutrons. This means that transmutation has occurred (since a nuclide of a different element will be produced), and this newly produced nuclide will have 2 fewer protons and 4 fewer neutrons than the original nuclide.

b) [tex]^{234}_{92} \text{U} \longrightarrow ^{4}_{2} \text{He}+^{230}_{90} \text{Th}[/tex]

c) Alpha decay occurs when an unstable nuclide emits a beta particle, (also known as an electron). This causes transmutation (since a nuclide of a different element will be produced), and this newly produced nuclide will have 1 more proton than the original nuclide.

d) [tex]^{131}_{53} \text{I} \longrightarrow ^{0}_{-1} \beta+^{131}_{54} \text{Xe}[/tex]

You could say either protons or neutrons.

Answer: Both are highly reactive.

Explanation:

A is fluorine, which only needs to gain one more electron to have a full valence shell. Thus, it is reactive.

D is sodium, which only needs to lose one electron to have a full valence shell. Thus, it is also reactive.

The number of moles of [tex]Na_2SO_4[/tex] form from 5.0 moles [tex]Na_2S[/tex] is 5 moles.

Limiting reactants are those reactants that are completely used up in a chemical reaction.

4.0 mol [tex]Na_2S[/tex] will be completely used since the combining ratio is 1 : 1 : 1.

[tex]Na_2S + CuSO_4[/tex] ->[tex]Na_2SO_4 + CuS[/tex]

From the chemical equation above, 5.0 moles [tex]Na_2S[/tex] will yield 5 moles of [tex]Na_2SO_4[/tex].

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Barium can form ions with a +2 charge and it is called a cation.

Ex:- Ba(s)+2HCl(aq)→BaCl2(aq)+H2(g)

In this redox reaction,

initially, barium shows 0 (s) oxidation no. and after forming the product its oxidation no. changes to +2 (in aq).

When a metal loses electrons and a nonmetal gets those electrons, cations (positively charged ions) and anions (negatively charged ions) are created.

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Answer:

H + 02 = H2O

Explanation:

A Chemical change occurs when methane gas is burned.

A chemical change is a change of materials into another, new materials with different properties and one or more than one new substances are formed.

A chemical change occurs when matter undergoes a change to form a new substance with different chemical properties, and the reaction is usually not reversible.

In this case,burning of methane gas (CH₄) considered as chemical change.

Oxygen and methane are the reactants, while the new substance formed from the reaction are carbondioxide (CO₂) and water (H₂O) as ;

CH₄ + O₂  --->  CO₂ + H₂O

Hence, Chemical change occurs when methane gas is burned.

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The molecular formula is the sum of the atomic masses of all atoms in the molecule.

The formula of Soda Ash:

Na₂CO₃ is also known as Sodium Carbonate.

The molecular mass of Soda Ash is

(2×Na)+(1×C)+(3×O)=106g/mol

The formula of Baking Soda:

NaHCO₃ is also known as Sodium bicarbonate.

The molecular mass of Baking Soda is

(1×Na)+(1×H)+(1×C)+(3×O)=84g/mol

The formula of Lime Stone:

CaCO₃ is also known as Calcium carbonate.

The molecular mass of Lime Stone:

(1×Ca)+(1×H)+(1×C)+(3×O)=100g/mol

The formula of Ethanol:

C₂H₅OH is the formula of ethanol.

The molecular mass of Ethanol:

(2×C)+(6×H)+(1×O)=46g/mol

The formula of Common Salt:

NaCl is also known as Sodium chloride.

The molecular mass of Common Salt:

(1×Na)+(1×Cl)=58.5g/mol

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Gravity increases as the mass of either object increases.

Gravity is the force by which a planet or other body draws objects toward its centre. The force of gravity keeps all of the planets in orbit around the sun.

Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.

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Answer:

two

Explanation:

Answer:

T₂ = 26.7 °C

Explanation:

Because you are dealing with pressure and temperature, you can use Gay-Lussac's Law to find the final answer. The equation looks like this:

P₁ / T₁ = P₂ / T₂

In this form, "P₁" and "T₁" represent the initial pressure and temperature. "P₂" and "T₂" represent the final pressure and temperature. You have been given the values for all of the variables but "T₂". Therefore, by plugging these values into the equation, you can simplify to find "T₂".

P₁ = 2.11 atm                   T₁ = 25 °C

P₂ = 2.25 atm                 T₂ = ?

P₁ / T₁ = P₂ / T₂                                            <--- Gay-Lussac's Law equation
(2.11 atm) / (25 °C) = (2.25 atm) / T₂           <--- Plug variables into equation

0.0844 = (2.25 atm) / T₂                            <--- Divide 2.11 by 25

(0.0844) x T₂ = 2.25 atm                           <--- Multiply both sides by T₂

T₂ = 26.7                                                    <--- Divide both sides by 0.0844

Answer: Option A, 66.5

Explanation:

So you want to use the heat capacity formula

So, q(heat)=m(mass) * cp (specific heat) * DeltaT (change in temp)

so m=45.8, cp =0.385, q=1172

you dont have the final temp for DeltaT so you have to fill in and divide

1172 = (45.8) * (0.385) * Delta T

1172 = 17.633 * DeltaT (Now divide)

1172/17.633 = Delta T

66.46 = Delta T, rounded you get 66.5 or option A

Explanation:

Ammonia has a formula mass of 17.031 g/mol, so the top blank is 1 and the bottom blank is 17.031

Calculating the product, we get the answer to be 1.5 mol

Answer:

Faster hydrogen burning means the star will grow larger and more luminous to allow the extra energy created to escape

it starts fusing hydrogen in a shell around a helium core.

Answer:

= 7 moles Mno

Explanation:

We have been asked to determine the number of moles required to form MnO.

Mole ratio

Mn : MnO = 1 : 1

The reaction ratio therefore is 1 : 1

Thus 7 moles of Mn react to form 7 moles MnO since we have similar ratio.

Answer:

The answer that I got was 7.0.

Explanation:

It said round to the tenths place so put the .0 after the seven and see if that helps.

Enrichment of uranium-235 is done. Hence, option A is correct.

The act, process, or means of keeping something within limits the containment of health costs.

Enrichment is a process of increasing the proportion of fissile isotope found in uranium ore (represented by the symbol 'U') to make it usable as nuclear fuel or the compressed, explosive core of nuclear weapons.

Hence, option A is correct.

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35 g (Rounded to the nearest tenth) H₂O can be made when 5.8 moles of HNO₃ are consumed.

Mole Ratio is a conversion factor between compounds in a chemical reaction, that is derived from the coefficients of the compounds in a balanced equation.

The mole ratio is therefore used to convert between quantities of compounds in a chemical reaction.

The mole ratio of HNO₃ and H₂O is 6 : 2

Hence, 16.9 moles of HNO₃ will produce = 2/6 × 5.8 = 1.93 moles of H₂O

Also,

Mass = Moles × M.Mass

Mass = 1.93 mol × 18.02 g/mol

Mass = 34.83 g H₂O

         = 35 g (Rounded to the nearest tenth)

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Explanation:

You may not realise it, but you come across aldehydes and ketones many times a day. Take cakes and biscuits, for example. Their golden, caramelised crust is formed thanks to the Mailliard reaction. This is a process that occurs at temperatures above 140° C, when sugars with the carbonyl group in foods react with nucleophilic amino acids to create new and complex flavours and aromas.

Another example is formaldehyde. Correctly known as methanal, it is the most common aldehyde in industry. It has multiple uses, such as in tanning and embalming, or as a fungicide. However, we can also react it with different molecules to make a variety of more useful compounds. These include polymers, adhesives and precursors to explosives. But how do aldehydes and ketones react, and why?You should remember from Aldehydes and Ketones that they both contain the carbonyl functional group , . This is a carbon atom joined to an oxygen atom by a double bond. Let's take a closer look at it.

If we compare the electronegativities of carbon and oxygen, we can see that oxygen is a lot more electronegative than carbon.

Answer: Gamma radiation

Explanation:

Gamma rays have high penetrating power, similar to high-energy X-rays.

Answer:

the basic element of organic compounds is carbon and they are called organic because associate with the living organism so the correct answer is

Answer:

c or d

Explanation:

it says it was playing classic music

In this case, the control group or control variable is the greenhouse where the plants are grown in silence, as this group does not receive any music treatment. Therefore, the correct answer is A.

Variables can be defined as any characteristics, number or a quantity that can be measured . It is also  called as a data item . It is called as variable because it can vary and can also have  wide variety of values.

There are 3 types of variables 1) manipulated variable where the condition is specified, 2) responding variable which is dependent on the manipulated variable 3)controlled variable which does not change.

In this experiment, the control group is the group that does not receive the experimental treatment and serves as a basis for comparison.

Thus, the correct answer is A , the silent greenhouse.

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(c) 2AgNO3 + Ni --> Ni(NO3)2 + 2Ag

Answer:

CsCl

Explanation:

The ionic species are:

           Cs⁺   and Cl⁻