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Korolek [52]
3 years ago
8

5) If a car travels 60 miles for two hours, what is the average speed?

Chemistry
1 answer:
sdas [7]3 years ago
3 0

Answer:

30 mi/hr

Explanation:

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Nickel is extracted from nickel oxide by reduction with carbon.
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Answer:

Nickel is extracted from nickel oxide by reduction with carbon. Nickel is a metal which react with atmospheric oxygen which is very reactive in order to protect the inner surface of metal. Carbon extract oxygen which is attached to the nickel in the form of nickel oxide because carbon is more reactive so it made a chemical bonds with oxygen and nickel oxide is converted into a pure nickel.

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What would make oppositely charged objects attract each other more?
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Answer: increasing the positive charge of the positively charged object and increasing the negative charge of the negatively charged object.

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A wooden artifact from an ancient tomb contains 60% of the carbon-14 that is present in living trees. How long ago was the artif
noname [10]

Answer:

The age of the sample is 4224 years.

Explanation:

Let the age of the sample be t years old.

Initial mass percentage of carbon-14 in an artifact = 100%

Initial mass of carbon-14 in an artifact = [A_o]

Final mass percentage of carbon-14 in an artifact t years = 60%

Final mass of carbon-14 in an artifact = [A]=0.06[A_o]

Half life of the carbon-14 = t_{1/2}=5730 years

k=\frac{0.693}{t_{1/2}}

[A]=[A_o]\times e^{-kt}

[A]=[A_o]\times e^{-\frac{0.693}{t_{1/2}}\times t}

0.60[A_o]=[A_o]\times e^{-\frac{0.693}{5730 year}\times t}

Solving for t:

t = 4223.71 years ≈ 4224 years

The age of the sample is 4224 years.

8 0
3 years ago
Which of the following can be changed in a chemical reaction?
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Answer:

Type of molecules

Explanation:

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2 years ago
Decide whether the property measured was a chemical or physical property of X, if you can. If you don’t have enough information
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<u><em>See attachment for explanations.</em></u>

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