In a chemical reaction, the products are

the compounds at the end of the reaction

The properties of a compound are

different from the elements in it

An example of a physical change is

mixing salt and sand to form a mixture

chemically bonded elements together

Signs of a chemical change are

gas produced and a new substance formed

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Introduction to chemistry

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#grade8 #stage4 quiz about chemical and physical changes, elements, compounds and mixtures #chemistry #elements #science

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Questions 25

Answers

1
The atomic number of Carbon is
2
6
4
8
2
Name the gas that humans breathe out
Carbon monoxide
Nitrogen
Oxygen
Carbon dioxide
3
Water is a
compound
element
mixture
drink
4
The chemical symbol for Lead is
Pl
Ld
Pb
Pd
5
What is NOT a state of matter?
gas
freezing
liquid
solid
6
In a chemical reaction, the products are
are productable
the compounds at the end of the reaction
the compounds that start a reaction going
what you put into the reaction
7
This is NOT a property of metal elements
Brittle
Good conductor
Shiny
Malleable and ductile
8
The best way to separate salt from a salty solution is
filtration
boiling
centrifuge
evaporation
9
The chemical symbol Aluminium is
Alu
A
AL
Al
10
What is the name of the change of a liquid to a gas state?
freezing
condensation
melting
evaporation
11
In a chemical reaction, the reactants are
are reactable
what is left behind by the reaction
what is made in the reaction
what goes into the reaction
12
A gas turning into a liquid is an example of a chemical change
True
False
13
The properties of a compound are
the same as the elements in it
different from the elements in it
made up by scientists
the same as one of the elements in it
14
Copper reacting with oxygen to form copper oxide is an example of a chemical change
True
False
15
An example of a physical change is
petrol burning to produce energy and water
mixing salt and sand to form a mixture
magnesium ribbon burning to produce magnesium oxide
a metal nail rusts to produce iron oxide
16
A compound is
a mixture of elements together
in the periodic table
chemically bonded elements together
the smallest parts of an element
17
Which metal element is a liquid at room temp?
magnesium
copper
mercury
silver
18
Signs of a chemical change are
bending a substance into a new shape
mixtures separating into smaller parts
a phase change from solid to liquid
gas produced and a new substance formed
19
If an element is magnetic then it must be
a metal
a non-metal
20
The number of elements in the periodic table is
100
162
79
118
21
This is NOT a way to separate mixtures
evaporation
shaking and stirring
adding vinegar for an acid reaction
filtration
22
How are the elements in the periodic table arranged?
by the order they were discovered
by atomic weight
by alphabetical order
by atomic number
23
Which element is NOT a metal?
gold
lead
mercury
nitrogen
24
An everyday example of a chemical change is
boiling water
lighting a match
filtering coffee beans
freezing a drink
25
Which element IS a metal?
magnesium
helium
chlorine
krypton

Introduction to chemistry Flashcards | StudBud