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Key Concepts in Chemistry
Key Concepts in Chemistry
22 terms
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A #KS3 #Chemistry #Atoms #elements #compounds
Flashcards
22 cards
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Practice quiz
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Questions
22
Answers
1
Which two of the following particle diagrams show molecules of a mixture?
C
D
B
A
2
Metals like aluminium are used to make cooking pots because they are …
malleable and good conductors of heat
brittle and poor conductors of heat
malleable and poor conductors of heat
brittle and good conductors of heat
3
A compound contains
at least two elements joined together
only two elements joined together
only one type of atom
only one element
4
All metals are …
conductors of electricity
solids
brittle and easily broken
strong
5
When iron and sulfur are mixed and heated, what might you observe?
A solid is formed
The mixture changes into a liquid
The mixture glows red
A gas is given off
6
We need to recycle some of our metals more because recycled metals …
produce more carbon dioxide
do not corrode as easily
save our limited natural resources
have better properties
7
Which list contains only typical properties of metals?
good conductor of heat, brittle, low melting point
good conductor of electricity, strong, high melting point
poor conductor of electricity, weak, low melting point
poor conductor of heat, strong, high melting point
8
The particle diagram above shows:
a mixture of compounds
a mixture of elements
an element
a compound
9
Which of the following particle diagrams show molecules of a compound?
A
B
D
C
10
Which two of the following shows the particles in a mixture of elements & compounds?
B
C
D
A
11
Which of the following particle diagrams show molecules of an element?
B
C
A
D
12
Which of these elements is used to build bridges?
Oxygen
Iron
Gold
Carbon
13
Which of the following particle diagrams show molecules of a mixture of elements?
B
A
D
C
14
When metals and non-metals form a compound, the compound will usually:
have different properties to the elements
be easily broken up
take up a larger volume than the elements
have the same properties as the elements
15
The reaction between calcium and oxygen forms:
calcium carbonate
calcium oxygen
calcium oxide
calcium oxate
16
Which of the following lists contains only elements?
air, iron, iodine, magnesium
chlorine, argon, sodium, limestone
zinc, gold, aluminium, oxygen
nitrogen, copper, mercury, water
17
Which of the following shows the particles in a mixture of elements?
C
D
A
B
18
Which of the following shows the particles in a mixture of compounds?
D
A
C
B
19
The correct way to write the chemical symbol for the element calcium is:
Ca
ca
cA
CA
20
What happens in all chemical changes?
Elements change into a compound
A gas is produced
One or more new substances are formed
Heat energy is given out
21
Which of the following particle diagrams show molecules of a mixture of an element & compound?
B
A
D
C
22
When iron and sulfur react they form:
a mixture of elements
a mixture of compounds
a new element
a new compound
