Chemistry Quiz for Grade 5
- Question of
What is a saturated solution?
- A solution in which as much solute as possible has been dissolved
- A solution in which a small amount of solute has been dissolved
- A solution in which some solute has been dissolved
- A solution in which no solute has been dissolved
- Question of
What effect does increasing the temperature have on the amount of solute that can be dissolved?
- More solute can be dissolved
- There is no difference in the amount of solute that can be dissolved
- More solvent is dissolved
- More solvent is dissolved
- Question of
There is another factor that affects the solubility of gases apart from temperature. What is this other factor?
- Pressure
- Density
- Boiling point
- Molecular mass
- Question of
As the temperature increases, the solubility of gases _________.
- decreases
- increases
- remains the same
- It is impossible to generalize
- Question of
What unwanted material can hard water produce in heating appliances, e.g. kettles and irons?
- Scale
- Scum
- Scurry
- Soap
- Question of
There is a possible health advantage to drinking hard water. What is it?
- It could reduce the incidence of heart disease
- It could reduce the incidence of diabetes
- It could reduce the incidence of strokes
- It could reduce the incidence of obesity
- Question of
Which was thought to be the most abundant gas in the Earth’s early atmosphere?
- Carbon dioxide
- Oxygen
- Nitrogen
- Argon
- Question of
Carbon dioxide entered the early atmosphere when it was released from __________.
- the volcanoes
- the oceans
- comets from space
- water in the atmosphere
- Question of
The percentage of water on the planet did NOT increase due to _________.
- plants
- condensation from the atmosphere
- comets
- volcanoes
- Question of
Which of the following gases is thought NOT to have been present in the early atmosphere?
- Oxygen
- Carbon dioxide
- Water vapour
- Methane
- Question of
Oxygen started to appear on Earth due to what organisms?
- Blue-green algae
- Plants
- Humans
- Viruses
- Question of
What process produces oxygen as a waste product?
- Photosynthesis
- Respiration
- Decomposition
- Combustion
- Question of
Which of these answers are proof that a CHEMICAL CHANGE (irreverisible) has occured? (Choose as many as you think are true)
- Change in color
- Bubbles (release of C02)
- Gives off heat
- All of them
- Question of
At one time in the Earth’s formation, some of the surface iron was oxidised. What gas in the atmosphere could NOT have caused this change?
- Nitrogen
- Carbon dioxide
- Oxygen
- Water vapour
- Question of
Which of the following developments is NOT as a result of concerns about carbon dioxide levels and global warming?
- Use of diesel oil instead of petrol in cars
- Use of vegetable oils as a fuel in cars
- Use of ethanol as a fuel in cars
- Development of electric cars
- Question of
The change in carbon dioxide concentration in the last 50 years is thought to be a result of _________.
- increase in the use of fossil fuels
- variation in the sun’s energy output
- increased volcanic activity
- increase in ocean temperatures
- Question of
What kind of change is occurring when the candle is melting ?
- Physical (reversible)
- Chemical (irreversible)
- Combustible
- None of these
- Question of
What kind of change is occurring when baking cookies ?
- chemical (irreversible)
- physical (reversible)
- Combustible
- None of these
- Question of
What would be the best technique to separate a mixture of beans and rice?
- sieves / strainers (various sizes)
- distilling / Using water
- magnet
- evaporation
- Question of
Which method would be the best to use in order to separate aquarium rocks and sawdust?
- sieves / strainer
- magnets
- distilling / water
- evaporation
- Question of
When you can no longer dissolve any more sugar into water the the solution is now _________.
- saturated
- solvent
- soluble
- solute
- Question of
Salad is an example of a ____.
- mixture (heterogenous)
- solution (homogeneous)
- substance
- solute
- Question of
Which method would be the best to use in order to separate sugar from lemon juice and water?
- evaporation
- sieves
- distilling / water
- magnets
- Question of
A chocolate milkshake is an example of a _______.
- homogenous mixture
- heterogenous mixture
- substance
- liquid
- Question of
The slime or film that forms on top of liquid is called _______. This is caused because the particles in the liquid cling together.
- surface tension
- molecules
- interaction
- adhesive
- Question of
A colourless gas having the chemical symbol CO2 is called _____.
- carbon dioxide
- oxygen
- carbon
- hydrogen
- Question of
Which of the following substances will not dissolve in water?
- flour
- cotton candy
- salt
- sugar
- Question of
How do you make a mixture?
- By combining 2 or more substances.
- By combining 3 substances.
- By pouring lots of one substance into a cup.
- By stirring water
- Question of
What is a heterogenous mixture?
- A combination of two or more substances where you can see the different parts.
- A combination of two or more susbtances where you cannot see the different parts.
- A single substance that you stir.
- None of these
- Question of
What is a homogenous mixture?
- A combination of two or more susbtances where you cannot see the different parts.
- A combination of two or more substances where you can see the different parts.
- A single substance that you stir.
- None of these