Quiz: Chemical Reactions (7.4)

Name:

How many atoms of hydrogen are in the following formula:

• 1
• 8
• 4
• 2

Which of the following will speed up a chemical reaction? (You may pick more than one answer)

• Add more of the reactants at a higher concentration.
• Break up the substance into smaller particles.
• Increase the volume.
• Decrease the temperature.

Is this a balanced chemical equation?

• Yes
• No

Is the following a balanced chemical equation:

• Yes
• No

A chemical formula:

• Is an expression that uses symbols showing the relationship between substances in a chemical reaction.
• Uses chemical symbols and numbers to represent a given substance.
• Describes the interaction between multiple substances.
• occurs when atoms are rearranged to produce new substances.

What coefficient should be used below to balance the equation?

• No coefficient
• 2
• 3

What is the subscript for chlorine in the products side of the following chemical equation?

• 1
• 2
• 3
• 4

If you want a reaction to speed up you could do which of the following?

• Add water.
• Decrease the temperature.
• Add a catalyst.

Which of these would not be an exothermic reaction

• Glow sticks
• Photosynthesis
• Hand warmers
• A flashlight