Year 9- Chemical Reactions

How many hydrogen, oxygen, carbon atoms in H₂CO₃?

• 2 hydrogen, 2 carbon, 3 oxygen

• 1 hydrogen, 2 carbon, 3 oxygen

• 2 hydrogen, 1 carbon, 3 oxygen

• 1 hydrogen, 3 carbon, 1 oxygen

Tags

NGSS.MS-PS1-1

What is the word equation for neutralization?

• H^- + OH^- = H₂O

• H⁺ + OH^- = H₂O

• H⁺ + OH^- = H₃O

• H⁺ + OH^- = HO

Tags

NGSS.HS-PS1-7

What is an example of an Endothermic reaction?

• Lighting a Match

• Ice Melting

• Light Bulb

• Explosion

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following does NOT state what the arrow means in a chemical equation?

• forms

• produces

• yields

• conserves

In general, if the temperature of a chemical reaction is increased, the reaction rate

• increases

• decreases

• remains the same

• cannot be predicted

Tags

NGSS.HS-PS1-5

In a compound, chemical energy is contained in the

• nuclei of the atoms.

• bonds

• unbonded electrons.

• movement of the electrons.

Tags

NGSS.HS-PS1-4

Which of the following statements is true about what happens during a chemical reaction?

• Bonds of the reactants are broken, and bonds of the products are formed.

• The bonds of both the reactants and the products are broken.

• Bonds of the reactants are formed, and bonds of the products are broken.

• The bonds of both the reactants and the products are formed.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The total amount of energy before and after a chemical reaction is the same. Thus, energy is

• created

• conserved

• destroyed

• the same as mass

Tags

NGSS.MS-PS1-5

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A log is burning in a fireplace. If the amount of oxygen reaching the log is decreased, which of the following statements is true?

• The reaction rate increases.

• The reaction rate decreases.

• The reaction rate remains the same.

• The reaction rate depends only on the temperature.

Tags

NGSS.HS-PS1-5

A reaction rate measures

• distance over time.

• the probability that a reaction will happen.

• how fast a reaction occurs.

• the time needed for a reaction to be completed.

Tags

NGSS.HS-PS1-5