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WorksheetsChemistry Revision 2
Total questions: 20
Worksheet time: 7mins
A student carries out an experiment to determine the rate of dissolving salt at different sizes. Which of the following apparatus (equipment) is essential for the experiment?
Conical flask
Stopwatch
Evaporating dish
Bunsen burner
What is the name given to the elements in
Group 1?
Halogen
Noble gas
Alkaline earth metal
Alkali metal
Write the formula for calcium chloride
CaCl
Ca2Cl
CaCl2
Ca3Cl2
What gas turns lime water milky?
Carbon monoxide
Hydrogen
Carbon Dioxide
Oxygen
How many atoms are there in this molecule?
2
3
4
5
Another word for burning in oxygen?
igniting
combining
combustion
respiration
Suggest the pH value of lemon juice?
1
3
7
10
An object that will dissolve in a liquid has the property called ___________________.
solubility
hardness
lustre
viscosity
Which name is given to a pure substance made from more than one type of atom that are chemically joined?
mixture
element
compound
ion
Which of the following is a chemical reaction?
Sodium and chlorine atoms bond to form salt molecules.
Ice melts to form water.
Carbon dioxide freezes to form dry ice.
Salt and water mix to form salt water.
H2 + O → H2O
What type of reaction is this?
Exothermic
Endothermic
Potential
Kinetic
A student mixed two chemicals to allow them to react. The temperature of the chemicals before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?
It is an exothermic reaction
It is an endothermic reaction
It is an exogenic reaction
None of the above
Pick the TWO (2) options that will INCREASE the rate of a reaction.
Reducing Heat
Adding Catalyst
Adding Heat
Reducing concentration
a. A mixture is made up of different substances that are chemically joined together.
b. You cannot change the amounts of substances in a mixture.
c. A pure substance has no other substance mixed with it.
