Final S2

Why must equations be balanced?

• Conservation of matter

• To make explosions

• To make chemical reactions

• All of the above

Which of the following are signs of a chemical reaction?

• Bubbling/gas

• Heat

• Color change

• Precipitation

• All of the above

What do reactions need in order to begin?

• Products

• Photosynthesis

• Activation energy

• A catalyst

What is the molar mass of NaCl?

• 87

• 35

• 47.5

• 58.44

What is the molar mass of NO3?

• 43.5

• 62.01

• 58.44

• 63.7

Which of the following are types of radiation?

• Infrared

• UV

• Visible light

• All of the above

What do greenhouses do?

• Release green gases

• Absorb infrared radiation

• Help the environment

• None of the above

What factors increase a chemical reaction?

• Catalyst

• surface are

• Temperature

• Reactants

• All of the above

Which of the following allow reactions to occur?

• Collision

• Energy

• Direction

• All of the above

As products increase reactants decrease

• True

• False