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Tanzania [10]
3 years ago
6

Electrolysis uses electrical current to break water molecules into oxygen gas and hydrogen gas. How do you know that this is a c

hemical change? There is a phase change from liquid to gas. Chemical bonds in the water molecule are broken. It is a single replacement reaction. Electrical current always causes a chemical change.
Chemistry
2 answers:
BigorU [14]3 years ago
4 0

Chemical bonds in the water are broken.

<u>As we know, water is made of hydrogen and oxygen. Thus, if an electric current is applied, it breaks the compound down to its individual elements. This is a chemical change. </u>

Xelga [282]3 years ago
3 0

Answer: Chemical bonds in the water molecule are broken.

Explanation:

A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.

Example: freezing of water

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.

Example: electrolysis of water

H_2O(l)\rightarrow H_2(g)+\frac{1}{2}O_2(g)

This is a decomposition reaction in which one reactant gives two or more than two products.

As the bonds between water are broken to form new bonds for formation of hydrogen and oxygen, the change is considered as chemical change.

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When two element combine to form more than one compound i hope this helps you with work have a nice day :)
7 0
3 years ago
PLEASE HELP ME
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Answer:

1.15 atm

Explanation:

According to Dalton's law of partial pressures, the total pressure is the sum of all the partial pressures of the gases present in the mixture.

Therefore we have:

Total pressure = partial pressure of carbon monoxide + partial pressure of oxygen + partial pressure of carbon dioxide

We were given the following:

Total pressure = 2.45 atm

Pressure of oxygen = 0.65 atm

Pressure of carbon monoxide = x

Pressure of carbon dioxide = 0.65 atm

Therefore:

2.45 = x + 0.65 + 0.65

2.45 = x + 1.3

x = 2.45 - 1.3

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6 0
4 years ago
3. 78 mL of 2.5 M phosphoric acid is neutralized with 500 mL of potassium hydroxide. What is the
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Hence, concentration of base is 1.17 M
7 0
3 years ago
Put the following in the correct chronological order from what happened first to what happened last.
Scilla [17]

Answer:

2-3-1-4

Explanation:

The astronomer Nicolaus Copernicus did not have a theory about the Earth revolving around the sun until he got into astronomy and began to study the patterns of the sun and the moon as well as reading other entries from previous astronomers. You can pretty much guess from there, he had to have the theory before proving it etc.  

3 0
3 years ago
Equal volumes of SO2(g) and O2(g) at STP contain the same number of
LuckyWell [14K]

Answer:

Equal volumes of SO2(g) and O2(g) at STP contain the same number of molecules

Explanation:

According to Avogadro Law,

Equal volume of all the gases at same temperature and pressure have equal number of molecules.

This law state that volume and number of moles of gas have direct relation.

When the amount of gas increases its volume will increase and when the amount of gas decreases its volume will decrease.

Mathematical relation:

V ∝ n

V/n = K

K is proportionality constant.

When number of moles change from n₁ to n₂ and volume from V₁ to V₂

expression will be,

V₁/n₁ = K     ,     V₂/n₂ = K

V₁/n₁ = V₂/n₂

8 0
3 years ago
Read 2 more answers
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