What Happens to Your Food?

What is the main purpose of fuels?

• To store energy permanently

• To release energy when burned

• To create new atoms

• To increase mass

What happens to the gasoline in a car after a long drive?

• It disappears completely

• It turns into water

• It undergoes a chemical reaction and changes into other substances

• It remains unchanged in the gas tank

Who was the French scientist that studied chemical reactions and matter conservation?

• Isaac Newton

• Antoine Lavoisier

• Albert Einstein

• Marie Curie

What does the Law of Conservation of Matter state?

• Matter can be created and destroyed

• Matter cannot be created or destroyed during chemical reactions

• Atoms disappear when burned

• Chemical reactions reduce the total mass of substances

What is the primary fuel used in most car engines?

• Ethanol

• Hydrogen

• Gasoline

• Coal

What are the two main products when ethanol burns?

• Oxygen and water

• Carbon dioxide and water

• Hydrogen and carbon

• Methane and nitrogen

Why do burned fuels seem to disappear?

• They turn into a liquid

• They become invisible gases

• They are absorbed into the ground

• They lose mass

What is ethanol made from?

• Oil

• Corn

• Water

• Coal

What gas increases in Earth's atmosphere due to burning fuels?

• Oxygen

• Carbon dioxide

• Hydrogen

• Nitrogen

Why don’t more cars use hydrogen fuel?

• Hydrogen fuel is too cold to use

• Hydrogen does not burn

• The technology is expensive and storing hydrogen is difficult

• Hydrogen fuel produces too much pollution