Speed of reaction

We can measure the speed of reaction by measuring the

• time taken for a reaction to be completed

• volume of gas produced in a period of time

• mass of reactants remaining in a period of time

• mass of reactants remaining

2 g lump and 2 g of powdered zinc are added to equal volumes of sulfuric acid. The solid line shows volume of gas given off when the lump is used.

Which line is obtained for powdered zinc?

• A

• B

• C

• D

The graph shows how the total volume of a gas given off from a reaction changes with time. In which time interval is least volume of gas given off?

• A

• B

• C

• D

The mass of a mixture of carbonate and acid was measured at regular time intervals. A graph of the mass against time was plotted. Which curve was obtained?

• A

• B

• C

• D

1 g of CaCO₃ is added to equal volumes of 1.0 mol/dm³ and 2.0 mol/dm³ H₂SO₄. The solid line shows volume of gas given off when 1.0 mol/dm³ H₂SO₄ is used. Acid is in excess. Which line is obtained for 2.0 mol/dm³ H₂SO₄?

• A

• B

• C

• D

Which factors affect the rate of a reaction?

• temperature

• concentration

• surface area of reactants

• pressure

• catalyst

An increase in temperature causes the reacting particles to ......

• lose energy and move slower

• gain energy and move faster

• lose energy and move faster

• gain energy and move slower

Why does a higher concentration increase the rate of reaction?

• it increases the amount of reactants

• it lowers the activation energy

• it increases the energy of particle collisions

• it increases the frequency of particle collisions

Tags

NGSS.HS-PS1-5

Why does a higher temperature increase the rate of a reaction?

• it increases both the frequency and energy of particle collisions

• it only increases the frequency of particle collisions

• it only increases the energy of particle collisions

• it reduces the activation energy of the reaction

Tags

NGSS.HS-PS1-5

Grinding a effervescent tablet into powder increases the rate of reaction due to increased

• concentration

• surface area

• temperature

• reactants

Tags

NGSS.HS-PS1-5