ATS Practical Quiz: Rates of reaction

In an investigation the independent variable is the factor you...

• change

• measure

• keep the same

In an investigation the dependent variable is the factor you...

• change

• measure

• keep the same

In an investigation the control variables are factors you must...

• change

• measure

• keep the same

When you react sodium thiosulfate and hydrochloric acid, the solution turns cloudy. This is because...

• a sodium precipitate is produced

• a sulfur precipitate is produced

A precipitate produced from 2 solutions is always a...

• solid

• liquid

• gas

The concentration of a solution is...

• how many particles there are

• how much liquid there is

• the strength of a solution

• the number of particles per cm3

When you observe the effect of concentration on the rate of a reaction you must ensure you keep the following factors the same (2 options are correct)

• concentration

• volume of solution

• temperature of solution

• mass

Which solution show a higher concentration (left or right)?

• left

• right

• both the same

When you add the sodium thiosulfate and hydrochloric acid together, you should always...

• heat them up

• swirl the flask to mix the solutions together

• cool them down

• filter

HCl is the chemical formula for...

• sodium thiosulfate

• sodium chloride

• sulfur dioxide

• hydrochloric acid