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WorksheetsChemical Reactions
Total questions: 32
Worksheet time: 1hrs 27mins
Which of the following can be signs that a chemical reaction has occurred?
Increase in temperature
Change of colour
Bubbling
All of the above
What is broken in a chemical reaction?
atoms
compounds
chemical bonds
nothing
What is the name of the compounds that go into a chemical reaction (i.e. on the left hand side of the arrow)?
Products
Mixers
Starters
Reactants
What is the name of the compounds that are the result of a chemical reaction (i.e. on the right hand side of the arrow)?
Products
Mixers
Starters
Reactants
The Law of Conservation of mass states that...
What goes up, must come down
Matter cannot be created nor destroyed in a chemical reaction
Matter must be reduced when a combustion reaction occurs
The change in mass is equally proportional to the amount of chemicals mixed
A precipitate is formed when...
a soluble chemical compound is formed in a reaction
an insoluble chemical compound is formed in a reaction
A chemical compound with a high mass is formed in a reaction
you mix more than 10 different chemicals together
In a combustion reaction (e.g. candle), what compound is needed for the reaction to occur?
Nitrogen (N2)
Oxygen (O2)
Carbon Dioxide (CO2)
Hydrogen (H2)
Which pH levels indicate something is acidic?
Less than 7
7
more than 7
4 pH levels were recorded for 4 different substances. Which substance is the most basic?
pH = 8
pH = 12
pH = 7
pH = 6
An indicator is a substance that...
Changes the pH of a substance
Keeps the pH constant in a chemical reaction
Changes colour depending on the pH of a substance
Stays the same colour regardless of pH
In a neutralisation reaction, an acid reacts with a base to produce what two compounds?
gas + metal
salt + water
metal + water
gas + water
In the reaction above, a compound is broken down into its components. What kind of reaction is this?
Combustion
Precipitation
Decomposition
Neutralisation
Acids are substances that...
Release hydroxide ions into water (OH-)
Release hydrogen ions into water (H+)
Have a high temperature
Rust is an example of which type of reaction?
Corrosion
Decomposition
Precipitation
Neutralisation
Which of the following is a real world example of a neutralisation reaction?
Putting your dirty clothes in the wash
Using petrol to start a fire
Putting vinegar on a wasp sting
Eating an apple
6CO2+ 6H2O → C6H12O6 + 6O2
The carbon atoms are balanced with ____ on each side of the reaction.
1
6
2
Determine whether the following equations is balanced or unbalanced. H4 + O2 ---> 2H2O
Balanced
Unbalanced
Determine whether the following equation is balanced or unbalanced. 2Fe + 3Cl2 ---> FeCl3
Balanced
Unbalanced
In order for an equation to be balanced, there must be ...
an equal amount of atoms on both sides
a greater mass on the product side
a greater mass on the reactant side
elements with the same atomic # on both sides
Table salt is a compound made from two elements, sodium and chlorine.
Which statement best explains why the characteristics of table salt are so different from the characteristics of sodium and chlorine?
Salt is processed by the evaporation of seawater or mineral-rich spring water
Salt is processed from salt mines because pure sodium does not occur in na
When sodium and chlorine combine, a physical change occurs and a new substance is formed.
When sodium and chlorine combine, a chemical change occurs and a new substance is formed.
Q. The mixing of acids and alkalis in order to form salt and water is what we called (a)
What colour change in universal indicator would you see if you added nitric acid to sodium hydroxide?
red -> blue
purple -> green
red -> yellow
pink -> colourless
.............................. + sodium hydroxide --> sodium chloride + water
Nitric acid
Sulphuric acid
Hydrochloric acid
Ethanoic acid
Which of the following solutions is suitable to be used to indicate neutralisation between acid and alkali?
Iodine solution
Sodium hydroxide solution
Colour paper
Universal indicator
Predict the products fo the following equation.
CuCl2 + H2S ---->
CuS(s) + HCl(aq)
Cu2S(s) + HCl(aq)
No reaction
CuS(s) + HCl(s)
Predict the products of the following reaction.
H2SO4 + BaCl2 ---->
BaSO4(s) + HCl(aq)
BaSO4(aq) + HCl(s)
No Reaction
ClSO4(aq) + BaH(s)
