WorksheetsCambridge Checkpoint Science Chemistry Topics
Total questions: 34
Worksheet time: 36mins
The air is a _________.
element
mixture
compound
energy
Water is a ___________.
element
mixture
compound
Carbon is a(n) ______
compound
element
mixture
Which of the following is true of oxygen?
Oxygen is an element because its most basic unit is a single type of atom
Oxygen is a compound because its most basic unit is a single type of atom.
Oxygen is a mixture because its most basic unit contains more than one particle.
Oxygen is a compound because its most basic unit contains more than one type of particle.
This image is a model of...
an element
a compound
a homogenous mixture
a heterogeneous mixture
This picture is a model of...
an element
a compound
a homogenious mixture
a heterogeneous mixture.
H2SO4
made up of?
All acids contain
hydrogen
oxygen
carbon
sulfur
salts are formed chemically when
solutions are left to evaporate slowly
the hydrogen in an acid is replaced by a metal (or ammonium)
the oxygen in an acid is replaced by a metal (or ammonium)
solutions are made to evaporate quickly by heating
All salts formed when a metal reacts with H2SO4 are called:
nitrates
sulfates
carbonates
chlorides
All salts formed when a metal reacts with HNO3 are called:
nitrates
sulfates
carbonates
chlorides
All salts formed when a metal reacts with HCl are called:
nitrates
sulfates
carbonates
chlorides
Reacting a metal with an acid will produce
a metallic salt and water
a metallic salt and hydrogen
a metallic salt and carbon dioxide
a metallic salt and water and carbon dioxide
Why is it not a good idea to react sodium metal directly with an acid?
sodium does not react easily when in direct contact with an acid, so will not produce a salt
sodium is an alkali metal so will only react with an alkali to form a salt
sodium is very reactive, so an "explosion" may occur
sodium is unreactive, so it is better to use sodium oxide to produce a sodium salt
Reacting a metal carbonate with an acid will produce
a metallic salt and water
a metallic salt and hydrogen
a metallic salt and carbon dioxide
a metallic salt and water and carbon dioxide
Reacting an alkali solution with an acid will produce
a salt and water
a salt and hydrogen
a salt and carbon dioxide
a salt and water and carbon dioxide
The "squeaky pop" test is used to detect
oxygen
hydrogen
carbon dioxide
water
The "Limewater" test is used to detect
oxygen
hydrogen
carbon dioxide
water
When a burning match/splint is used to test the products of the reaction between an acid and a metal, it will
go out
burst into more flame
produce a squeaky pop
turn the solution milky
When a burning match/splint is used to test the products of the reaction between an acid and a metal carbonate, it will
go out
burst into more flame
produce a squeaky pop
turn the solution milky
A substance is considered "soluble" if it
dissolves in acid
dissolves in water
dissolves in alkali
always remains as a solution
The best way to obtain crystals of a salt formed by a chemical reaction is to
Heat the solution to quickly evaporate any water, leaving only crystals
filter the solution, then heat the filtered solution to quickly evaporate any water, leaving only the salt crystals
leave the unfiltered solution to slowly evaporate until only crystals remain
filter the solution, then allow the solution to slowly evaporate until only the salt crystals remain
When a metal salt reacts with a more reactive metal, what sort of reaction occurs?
Displacement
Neutralisation
Combustion
No Reaction
