Rates of Reactions

A solution of hydrogen peroxide releases oxygen slowly at room temperature.
 hydrogen peroxide → water + oxygen
 The diagrams show the effect of adding blood to the solution. What could be the reason for the observed change? 

• Blood contains an enzyme. 
• Blood contains water. 
• The hydrogen peroxide becomes more concentrated. 
• The hydrogen peroxide is neutralised by blood. 

Tags

NGSS.HS-PS1-5

A liquid X reacts with solid Y to form a gas.
Which two diagrams show suitable methods for investigating the speed of the reaction? 

• 1 and 3
• 1 and 4
• 2 and 3
• 2 and 4

Tags

NGSS.HS-PS1-5

A student investigates the speed of the reaction between a lump of zinc and an acid at room temperature. Which other item of apparatus does the student need for this experiment? 

• Bunsen burner 
• measuring cylinder 
• stop watch
• thermometer 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• A
• B
• C
• D

In an experiment, a 2 g lump of zinc and 2 g of powdered zinc are added separately to equal volumes of dilute sulphuric acid. The solid line on the graph shows the volume of gas given off when the 2 g lump is used. Which dotted line is obtained when the zinc is powdered? 

• A
• B
• C
• D

Tags

NGSS.HS-PS1-5

In which experiment is the rate of reaction between hydrochloric acid and calcium carbonate slowest? 

• A
• B
• C
• D

Tags

NGSS.HS-PS1-5

Calcium carbonate reacts with hydrochloric acid to form carbon dioxide. Which changes would slow this reaction down?
 1  decreasing the concentration of hydrochloric acid
 2  decreasing the particle size of calcium carbonate
3  decreasing the temperature 

• 1 and 2 only 
• 1 and 3 only 
• 2 and 3 only 
• 1, 2 and 3 

Tags

NGSS.HS-PS1-5

In separate experiments, a catalyst is added to a reaction mixture and the temperature of the mixture is decreased.
What are the effects of these changes on the rate of the reaction? 

• A
• B
• C
• D

An experiment is carried out to investigate the rate of reaction when calcium carbonate is reacted with hydrochloric acid. The volume of carbon dioxide gas given off is measured at different intervals of time. The diagram shows pieces of apparatus used to collect gases. 
Which apparatus is suitable to collect and measure the volume of the carbon dioxide? 

• 1, 2 and 3 
• 2 and 3 only 
• 1 only 
• 3 only 

A student investigated the rate of reaction of calcium carbonate with dilute hydrochloric acid. Every minute, the student recorded the total volume of carbon dioxide produced, until some time after the reaction was complete.
Which graph shows the correct results? 

• A
• B
• C
• D

Tags

NGSS.HS-PS1-5