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WorksheetsChemical Reactions
Total questions: 19
Worksheet time: 14mins
conductivity is a property of metals
true
false
A colour change is an evidence of chemical reaction
true
false
stretching a rubber band is an example of
physical
chemical
nuclear
combustion
Ice melting is an example of chemical change
yes
no
never
dont know
which of the following would indicate a chemical change
a new substance formed
a gas given off
the reaction mixture became hotter
all of the above
Is sugar dissolving in water a chemical or physical change
physical
chemical
nuclear
precipitation
condensation is the change of state from
solid to liquid
liquid to gas
gas to liquid
solid to liquid
in the chemical reaction iron + sulphide ---> iron sulphide which statement is true
Iron is the only reactant others are products
sulphide is the only reactant others are products
iron sulphide is the only reactant others are products
Iron and sulphide are reactants and iron sulphide is a product
a catalyst undergoes changes in a chemical reaction
true
false
a catalyst speeds up a chemical reaction
true
false
if the reactants are in fine powder form the reaction will
speed up
slow down
when the reactants are cooled , and the temperature decreases , products are produced at a slower rate
true
false
unsure
In a chemical reaction the molecules in reactants rearrange to form new molecules
the statement is true
the statement is false
have no idea
not taught in class
A limestone made of calcium carbonate is exposed to acid rain(sulphuric acid ) to form calcium sulphate and carbon dioxide gas. The equation would look like
calcium carbonate+sulphuric acid-----> calcium sulphate+carbon dioxide
calcium carbonate-----> calcium sulphate + carbon dioxide
calcium sulphate + carbon dioxide ----. calcium carbonate
sodium bicarb+ vineager -----> carbon dioxide
Which of the following 2 are chemical reactions?
sugar dissolving in water
water turning into steam
burning wood
mixing baking soda and vinegar
tearing paper
In a chemical reaction, if the reactants are heated, the reaction usually happens
slower
faster
at the same rate
in a smaller volume
