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Year 8 Chemistry Revision 2017 Flashcards | StudBud
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Year 8 Chemistry Revision 2017
Year 8 Chemistry Revision 2017
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Year 8 Chemistry Revision #year8 #compounds #elements
Flashcards
25 cards
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Questions
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Answers
1
In a word equation, what you start with are called ________ and are to the left of the arrow.
the results
the products
the reactants
2
Define the 'mass number' of an atom.
The number of protons
The total number of protons and neutrons
The total number of protons and electrons
The total number of protons, electrons and neutrons
3
This picture shows what type of physical change?
change in state
expansion
change in shape
precipitate forming
4
Which particle diagram shows a solid?
C
B
A
D
5
How many of each type of atom are in the substance CaCO
3
?
None of these
1 x Calcium, 1 x Carbon 3 x Oxygen
2 x Carbon, 1 x Aluminium, 3 x Oxygen
3 x Calcium, 3 x Carbon, 3 x Oxygen
6
On the scale shown, the weakest base is
milk
battery acid
sea water
baking soda
7
On the scale shown, the strongest acid is
baking soda
ammonia
stomach acid
cola
8
A Fluorine atom has a mass number 19 and an atomic number 9. How many NEUTRONS does it have?
10
9
19
9
What is the atomic number of the element pictured?
32
18
33
16
10
With universal indicator, what colour is a weak acid?
green
yellow
orange
blue-green
11
The new chemicals formed in a chemical reaction are called
the reactants
the products
the result
12
What is the atomic number of the element Be?
56
9
137
4
13
A change in which no new chemical substances are formed; many are easy to reverse.
chemical change
physical change
14
Which does not describe the arrangement of particles in a liquid?
Particles have a fixed volume
Particles can flow
Particles can not be compressed
Particles have lots of energy
15
Which does not describe the arrangement of particles in a solid?
Particles have very little energy
Particles are close together
Particles flow easily
Particles vibrate on the spot
16
Which does not describe the arrangement of particles in a gas?
Particles can be compressed
Particles have a fixed shape
Particles have lots of energy
Particles are free moving
17
A substance is yellow in Methyl red and red for litmus so it has a pH of
6-7
4-5
5-6
7-8
18
The chemical formula for calcium chloride is CaCl
2
. What does this tell you?
There are two calcium atoms for every chlorine atom
There are two calcium and two chlorine atoms.
It contains two CaCl molecules
There are two chlorine atoms for every calcium atom
19
What is the atomic mass (mass number) of the element Barium?
9
4
56
137
20
Which particle diagram shows a compound?
D
C
A
B
21
Which particle diagram shows a gas element?
A
B
C
D
22
A substance is pink in phenolphthalein and yellow in methyl orange so it has a pH of
9-13
11-13
10-14
12-14
23
What colour and pH is neutral?
6 - green
blue - 8
green - 7
7 - yellow
24
What is a CHEMICAL CHANGE?
Makes a new substance
None of these
Heating or cooling
Change of state
25
Fireworks exploding is a chemical reaction. Which is NOT a chemical change?
light is released
permanent colour change
a change in temperature (heat)
change in shape
