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Furkat [3]
2 years ago
9

What are some ways you can determine a chemical change has occured

Chemistry
1 answer:
FromTheMoon [43]2 years ago
4 0

1. Color changes.

The Statue of Liberty, though known for its green color, was originally covered in a layer of copper. After a redox (reduction-oxidation reaction) the color changed due to a chemical change.

2. Gas Production

3. Light Produced

Light sticks work as the result of a chemical reaction between hydrogen peroxide and phenol oxalate ester.

4. Temperature Changes

5. Volume Change

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When 27.50 liters of oxygen gas reacts with excess hydrogen gas at STP how many grams of water is produced?
telo118 [61]

<u>Answer: </u>The mass of water produced is 44.28 g

<u>Explanation:</u>

We are given:

Volume of oxygen gas = 27.50 L

At STP conditions:

22.4 L of volume is occupied by 1 mole of a substance

27.50 L of oxygen gas will be occupied by = \frac{1mol}{22.4L}\times 27.50L=1.23mol

The chemical equation for the formation of water follows:

2H_2+O_2\rightarrow 2H_2O

By the stoichiometry of the reaction:

If 1 mole of oxygen gas produces 2 moles of water

So, 1.23 moles of oxygen gas will produce = \frac{2}{1}\times 1.23=2.46mol of water

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}} ......(1)

Molar mass of water = 18 g/mol

Plugging values in equation 1:

\text{Mass of water}=(2.46mol\times 18g/mol)=44.28g

Hence, the mass of water produced is 44.28 g

5 0
3 years ago
Lokesh is sawing boards to make a deck. What is the area of the deck?
Alekssandra [29.7K]

Answer: The answer would be B. 171 square feet

Explanation:

I took the test and got it right / Hope it helps!:)

4 0
3 years ago
Read 2 more answers
How much mass does 6 moles of K have?
vladimir1956 [14]

Answer:

234.6

Explanation:

6 0
1 year ago
On hot days, you may have noticed that potato chip bags seem to “inflate”, even though they have not been opened. If I have a 25
Taya2010 [7]

The new volume of the bag : 747.43 ml

<h3>Further explanation</h3>

Charles's Law  

When the gas pressure is kept constant, the gas volume is proportional to the temperature  

\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}

V₁=250 ml

T₁=19+273=292 K

T₂=600+273=873 K

\tt V_2=\dfrac{V_1.T_2}{T_1}\\\\V_2=\dfrac{250\times 873}{292}\\\\V_2=747.43~ml

7 0
3 years ago
Consider the following reaction:
lesantik [10]

Answer:

the equilibrium partial pressure of BrCl is pBC = 784.52 torr

Explanation:

Since

Br₂(g) + Cl₂(g) ⇌ 2BrCl(g) , Kp=1.112 at 150 K

denoting BC as BrCl , B as Br₂ , C as Cl₂, p as partial pressure , then

Kp = pBC²/[pB*pC]

solving for pBC

pBC = √(Kp*pB*pC)

replacing values

pBC = √(Kp*pB*pC) = √(1.112*751 torr*737 torr) = 784.52 torr

pBC = 784.52 torr

then the equilibrium partial pressure of BrCl is pBC = 784.52 torr

6 0
2 years ago
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