Chemistry confusion...10 points to the best answer!?

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Haha Yoo

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In the reaction hydrogen + oxygen water, what is the product, or what are the products?

hydrogen

hydrogen and oxygen

water



What does the law of conservation of mass say?

Mass cannot be created but it can be destroyed in a chemical reaction.

Mass can be created but it cannot be destroyed in a chemical reaction.

Mass cannot be created or destroyed in a chemical reaction.

Chemical reactions remain unbalanced.



3. Uranium hexafluoride (UF6) is called hex by nuclear chemists. It is the main form of radioactive waste produced in nuclear power plants. Which of the following is a balanced chemical equation involving UF6?

U + F2 --> UF6

U + 3F2 --> UF6

2U + 3F2 --> 2UF6

3U + 3F2 --> 3UF6



4. Which of the following equations violates the law of conservation of mass?

C + O2 --> CO2

U + 3F2 --> UF6

2H2 + O2 --> 2H2O

H + O --> H2O



5. Stannous oxide (SnO2), also called tin oxide, can be used to create brilliant white glazes for ceramics. It is involved in the equation SnO2 + 2 H2 --> Sn + 2 H2O. What role does stannous oxide play in this equation?

It is a reactant.

It is a product.

It reacts with pure tin.

It reacts with water.
 
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