Chemical Reactions Quiz

Everything is made of_____________________.

• chemicals

• science

• sodium chloride

• helium

Chemicals can react to form_______________________.

• new chemicals

• more atoms

• nothing
• the same chemicals

What happened when Bill ran electricity through the water molecules?

• They made bigger water molecules

• Water split into Hydrogen and Oxygen gas

• It boiled and became water vapor

• It became carbon dioxide gas

What happened when the steel wool reacted with the oxygen in the air?

• The steel wool glowed and gave off energy

• The steel wool burned and absorbed energy

• The steel wool reacted with Nitrogen in the air

• The steel wool boiled and became a gas

In the steel wool reaction, energy____________________.

• was given off

• was destroyed

• was absorbed

• did not change

Fire is a​ (a)   that happens when chemicals react with ​ (b)   in the air.​ ​

• Chemical Reaction
• oxygen
• nitrogen
• physical change
• carbon dioxide

What happened when the Sodium(Na) was put in water?

• It glowed and gave off energy

• It dissolved

• Nothing happened

• It glowed and absorbed energy

Sodium and Chlorine when separate are dangerous. But when they are ​ (a)   ​ they form ​ (b)   which is also called ​ (c)   .

• bonded
• sodium chloride
• salt
• separated
• sugar
• energy

When a chemical reaction takes in more energy than it gives off it becomes _______________.

• colder

• hotter

• bigger

• smaller

There are only_________ naturally occurring elements in the world.

• 92

• 300

• 2

• 103