WorksheetsChemistry Y8
Total questions: 20
Worksheet time: 10mins
An electron is
positively charged
neutral
negatively charged
atomic number is
the number of protons
the number of electrons
the number of neutrons
the location of an atom on the periodic table
Atomic Mass is the number of
protons and neutrons in the nucleus of an atom
protons and electrons in the nucleus of an atom
neutrons and electrons in the nucleus of an atom
Conservation of mass means
all the atoms present before a chemical reaction are not present after
atoms present before chemical reactions are present after
new substances and new elements are formed in a chemical reaction
An elements is
a substance that cannot be split into simpler substances
a substance that can be split into simpler substances
A pure substance that is a compound is made out of
particles of more than one type of atom
particles of the same type of atom
a mixture of two or more substances that can be physically separated
A molecule is
a singular particle of a particular element
another name for an element
2 or more atoms that are combined
which of the statements on physical changes are correct
A physical change cannot be reversed
A physical change is a change in state
A physical change is a change in form
A physical change is where new substances are formed
Signs of a chemical change include;
change of colour, change of temperature, precipitate (solid) formed, gas released.
change of colour, reversing back to original form, precipitate (solid) formed, gas released.
Water is the product of the reactants:
oxygen and water
oxygen and carbon
hydrogen and oxygen
In a chemical reaction, reactants contact each other, bonds between atoms in the reactants
are broken, and
atoms rearrange and form new bonds to make the products.
atoms remain the same and do not form new bonds to make the proudcts
When an acid reacts with a metal following is the product
salt + hydrogen
salt + carbon dioxide + water
bases are the same as an acid
true
false
Bases that dissolve in water are called
caustic
alkalis
reactants
products
A Ph scale of7/8 is
acidic
neutral
basic
To neutralise an acid you add a
acid
base
Ph indicator
equal amount of water
How many atoms of sodium (Na) are in one molecule of baking soda?
1
2
3
4
Ozone and Oxygen molecules are the same substance because they both are made only of oxygen atoms.
true
false
What is the chemical symbol for carbon?
C
Ca
Cn
Crn
How many atoms make up one molecule of laughing gas?
1
2
3
4
