What is the percent composition of hydrogen in a compound if the mass of the initial compound is 276 grams and the mass of collected hydrogen after decomposition is 41.4 grams?

A.

6.6%

B.

10.0%

C.

15.0%

D.

21.2%

How much argon do you breathe in each breath?

What did JJ Thomson discover about atom? What did his atom model look like?

Which of the following resources is renewable? A. copper B. diamonds C. wood D. fossil fuels

6. Write a balanced equation for each reaction. You must change each word equation into a chemical equation with actual formulas of the substances.

Digital information is a code consisting of zeroes and ones. what is the term for this type of information.

Which substance is the oxidizing agent in this reaction? 2CuO+C→2Cu+CO2 Express your answer as a chemical formula.

Why does the light bulbs have to be part of the loop in order for it to be succesful?

Which best describes the transition from gas to liquid? Energy must be removed because particles in liquid move more slowly. Energy must be added because particles in liquid move more quickly.

Calculate the mass of a 0.255-ml sample of a liquid with density 0.660 g/ml.

Which statement correctly describes the interaction between magnetic poles? North and south poles attract each other. North and south poles repel each other. Two north poles will attract each other. Two south poles will attract each other.