Question 1
Which substance is a mixture?
A
air
B
graphite
C
oxygen
D
water
Question 2
Four statements about atoms are listed.
1 The centre of an atom is positively charged.
2 Protons and electrons are located in the nucleus.
3 Protons and electrons have the same mass.
4 Most of the mass of an atom is in the nucleus.
Which statements are correct?
A
1 and 2
B
1 and 4
C
2 and 3
D
3 and 4
Question 3
Some information about particles P, Q, R and S is shown.
Which two particles are isotopes of the same element?
A
P and Q
B
P and S
C
Q and R
D
R and S
Question 4
Magnesium reacts with oxygen to form magnesium oxide.
What happens to magnesium atoms and oxygen atoms during this reaction?
A
Magnesium and oxygen share two electrons.
B
Magnesium gains two electrons and oxygen loses two electrons.
C
Magnesium loses one electron and oxygen gains one electron.
D
Magnesium loses two electrons and oxygen gains two electrons.
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