If 1.0 a of current are passing through a wire how many electrons pass through a cross-section of the wire in 1.0 hours?

3.6*10²² electrons will pass through in 1 hour.

Explanation:

From Faraday's law of electricity,

Q = I T

Q = charge passed through = ?

I = current passing through = 1A

T = time the current is passed through = 1hour = 3600s

Q = I *T

Q = 1 * 3600

Q = 3600c

But 1 electron has a charge of 1.60 * 10-19c

How many electrons will have a charge of 3600C

X = (3600 *1) / 1.60 * 10-19

X = 3.6 * 10²² electrons.

3.6*10²² electrons will pass through in 1 hour.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.