Rate of Reactions

If the temperature is reduced, a reaction rate will ______

• increase

• decrease

• stay the same

Tags

NGSS.HS-PS1-5

Diagram shows the apparatus set up for an experiment to determine the rate of reaction.

Which of the following techniques is the most suitable to determine the rate of reaction?

• Record the time as soon as precipitate is formed

• Record the time taken to obtain the maximum temperature

• Record the times as soon as the cross mark cannot be seen

• Record the times taken for the change of the pH value until a fixed pH value is obtained

Tags

NGSS.HS-PS1-5

The following equation shows the reaction between calcium carbonate, CaCO₃ and hydrochloric acid, HCl:

CaCO_3(aq) + 2HCl_(aq) → CaCl_2(aq) + CO_{2 (g)­­} + H₂O_(l)

Which of the following is the suitable method to determine the rate of reaction?

• Change in the temperature of the solution with time

• Change in the mass of water with time

• Change in the volume of carbon dioxide gas with time

• Change in the concentration of hydrochloric acid with time

Tags

NGSS.HS-PS1-5

Diagram 7 shows a graph of the volume of gas produced against time for the reaction between zinc granules and hydrochloric acid. The gradient of the graph decreases with time because ...

• volume of mixture decreases

• temperature of reaction decreases

• concentration of hydrochloric acid decreases

Tags

NGSS.HS-PS1-5

Diagram 4 shows the graph of volume of carbon dioxide gas against time when 5 g of marble chips is added to 50 cm³ of 0.2 mol dm^-3 hydrochloric acid. At what time the rate of reaction the highest?

• t1

• t2

• t3

• t4

Tags

NGSS.HS-PS1-5

Which of the following changes decreases the rate of reaction between magnesium and dilute hydrochloric acid?

• 1,2,3

• 1,2

• 1,3

• 2,3

Tags

NGSS.HS-PS1-5

The ___________ the surface area of the reactants, the higher the reaction rate.

• larger 

• smaller

WHATS THE ANSWER?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-5

WHATS THE ANSWER

• A

• B

• C

• D

Tags

NGSS.HS-PS1-5

What is your answer?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-5