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20 questions
Imagine you are in a science lab. You have four substances in front of you: Aluminium (Al), Carbon Dioxide (CO2), Nitrogen (N), and Sand. Which one of these is a compound?
Aluminium (Al)
Carbon Dioxide (CO2)
Nitrogen (N)
Sand
How would you know if a solid is a pure substance?
It will melt at a range of temperatures.
It will melt at a single temperature.
It will boil at a range of temperatures.
It will boil at a single temperature.
A chemist is working in a lab and creates a model. This model represents a(n) _______________.
Mixture of Elements
Mixture of Compounds
Mixture of Compounds and Molecules
Mixture of Compounds and Elements
Ms Lenny is at the beach and she accidentally drops her bag of salt into the sand. She now has a mixture of sand and salt.
Which option below can she use to retrieve the sand from the mixture?
filtration only by pouring mixture of sand and salt through filter paper
dissolving only by adding water to mixture
dissolving first then use filtration
dissolving first then use evaporation
Which of the following is a method of separating solutions?
hand separation
filtering
screening
evaporation
Oil and Vinegar are a ___________.
Heterogeneous Mixture
Solution
A compound
The base of Italian dressing
An Element (and brothers) chemically bonded with a different type of element. The Element became a __________________________.
compound
mixture
solution
group
This type of matter can be separated by physical means.
Mixtures
Pure Substances
Elements
Compounds
Wood burning is an example of ___________.
Physical properties of a substance include _________.
Water and methane are examples of ______________.
The ability to rust is a _____________ property.
Physical
Chemical
Baking soda combines with vinegar to create bubbles of carbon dioxide gas.
physical change
chemical change
When mixing milk and vinegar, a white, chunky, solid substance is formed. What has occurred?
Physical change: state of matter
Chemical change: production of a solid
Physical change: freezing
Chemical change: rust
Which of the following is NOT an example of chemical change?
Milk turning sour
Burning wood
Breaking a pencil
Metal turning rusty
The melting of wax is an example of a ____________ change.
chemical
physical
If you spilled nails in a sandbox, what separation tool/method could you use to clean out the sandbox so it would be safe for children to play in?
Filter
Screen
Magnet
Evaporation
Name the separation technique
Distillation
Crystallisation
Evaporation
Condensation
What causes ice to melt into water?
physical properties
chemical energy
temperature
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