Rate of Chemical Reactions

What units are used to measure the quantity of reactants or products in the rate of reaction equation?

• Grams or centimeters cubed

• Moles or decimeters cubed

• Pounds or gallons

• Kilograms or liters

If 180 cm³ of hydrogen is produced in 2 minutes, what is the rate of hydrogen production in cm³ per second?

• 90 cm³/s

• 3 cm³/s

• 0.5 cm³/s

• 1.5 cm³/s

________ the concentration ______ the reaction rate.

• increasing; decreases

• increasing; increases

• decreasing; increases

• decreasing; does not effect

Tags

NGSS.HS-PS1-5

Enzymes in your body act as catalysts. Thus, the role of enzymes is to___________.

• inhibit chemical reactions.

• increase the rate of chemical reactions.

• decrease the rate of chemical reactions.

Tags

NGSS.HS-PS1-2

A substance that slows down or stops a chemical reaction is called a(n)______________.

• concentrate

• catalyst

• inhibitor

• product

Which of the following would react fastest in sweet tea?

• a sugar cube

• a sugar cube cut in half

• a sugar cube cut in fourths

• a sugar cube crushed into powder

The minimum amount of energy needed for substances to react is called__________.

• Activation Energy

• Catalyst Energy

• Endothermic Energy

• Exothermic Energy

Tags

NGSS.HS-PS1-4

Which factor does NOT increase the rate (speed) of a chemical reaction

• Increasing concentration

• Increasing temperature

• Increasing surface area

• Increasing inhibitor

Tags

NGSS.HS-PS1-5

What is the effect of temperature on the rate of a chemical reaction?

• Increases the rate

• Decreases the rate

• Has no effect

• Reverses the reaction

Tags

NGSS.HS-PS1-5

Which of the following is a catalyst in a chemical reaction?

• Water

• Enzyme

• Salt

• Sugar