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Chemistry - Year 8 Science Term 2 Flashcards | StudBud
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Chemistry - Year 8 Science Term 2
Chemistry - Year 8 Science Term 2
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Changing of substances
Flashcards
23 cards
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Practice quiz
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Questions
23
Answers
1
Which of these right?
Carbon + Oxygen = CO2
Carbon & Oxygen = Carbon Dioxide
Carbon + Oxygen ➡ Carbon Dioxide
Carbon + Oxygen ➡C2O
2
Which of these means that a
physical
change has happened?
A new substance was formed
It changes colour
2 substances mixed together to form a mixture
Energy is absorbed/ released
3
Which states of matter are compressible?
None can be compressed
Gas
Liquid
Solid
4
What does 'alloy' mean in terms of chemistry?
A metal that is made up of a single element
Something that has many protons
A metal mixed with something else
A non-metal element
5
Why is it important to know the model structure for matter (best answer)?
For fun
To invent new things
Because you have too
For science tests
6
When a solid is dissolved in a liquid, the solid is called the
solute
.True or false?
True
False
7
What happens when an object expands?
Its volume increases, as does the density
Only the density is increased
Only the volume of the object increases
Its volume increases, but the density decreases
8
Magnesium + Oxygen = Magnesium Oxide
. Is the structure of the word equation correct?
Correct structure
Incorrect structure
9
Solids' particles are rigid (inflexible), true or false?
True, the particles are rigid
False, the particles aren't rigid
10
Define the term 'evaporation'
When a gas is cooled and becomes a liquid
When liquid is heated and turns into a gas
When a solid is heated to produce gas
When a liquid is cooled to produce a solid
11
If yellow and red paint is mixed to form orange paint, is it a physical or chemical change?
Physical change, no new substance has been formed
Chemical change, there was a colour change
12
What is the correct symbol for
carbon
?
Cb
Cr
Ca
C
13
What is sublimation?
When a gas is cooled and produces liquid
The mixing of two or more substances (reversible)
When a solid is heated and turns into a gas
When metal expands and contracts
14
Respiration is the process of obtaining energy from food.
True or false
?
False
True
15
Which graph is most suitable for 'How long it takes for water to boil over a bunsen burner'?
Bar
Pie
Column
Line
16
Define the term 'Flammability'.
Whether or not something can catch on fire
How easily something burns
Fire
How hot a combustion is
17
Which of these is the first 7 elements of the periodic table
in order?
H, He, L, Be, B, Ca, N, O
H, He, Li, B, Bo, C, Ni, O
H, Helium, Lithium, Beryllium, B, Carbon, N, Oxygen
Hydrogen, Helium, Beryllium, Lithium, Boron, Oxygen
18
What is the meaning of combustion?
An explosion
Making H2 O (only)
The process of burning with oxygen
Conducting light and heat
19
Which of the following statements is
false
about diffusion?
When two liquids mix together their particles diffuse.
During diffusion, gas particles move in a zig-zag fashion.
The diffusion process is slower in liquids.
Increasing the temperature doesn't speed up diffusion.
20
What is the correct symbol for gold?
Au
Fe
Ne
G
21
Which of these statements are true about matter?
Matter is made up of invisible ball-like particles
Matter is always moving
Its particles are attracted to each other
All of the above
22
Which if these are listed in the correct size order (
smallest to biggest
)?
Atom, neutron, molecule, proton
Electron, neutron, atom, molecule
Proton, neutron, atom, molecule
Matter, particles, atom, proton, neutron, electron
23
What would you call the process of
rusting
?
Corrosion
Erosion
Respiration
Physical change
