Oquizy

Xinyi are testing the effect of concentration on rate of reaction. Which is the best experimental control?

Changing temperature each time Keeping volume and temperature constant Measuring pH after every test Using different acids

What conclusion can you draw?

A contains a mixture A is pure B has three substances Solvent didn't work

John measures the boiling point of an unknown liquid and finds it boils between 72°C and 76°C. Which statement is false?

It can be a solid at room temperature It is a mixture Its melting point is 43°C The substance is pure

What is the Rf value?

0.40 0.60 1.67 6.00

John calculates the Rf as 1.25. What does this indicate?

Correct result Spot moved further than solvent front The ink dried too quickly The solvent was too slow

Quiz: Chemistry - Experimental Chemistry