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Practice - Materials and Their Properties - 09

Welcome young scientists! Ready to put your knowledge to the test? In this quiz, we'll explore the thrilling world of science, focusing on changes of states, mixtures, solutions, and reversible & irreversible changes. This is your chance to show off your scientific skills. Good luck and remember, science is all about discovery!
1.
What is the process of changing from a solid to a gas called?
Melting
Freezing
Sublimation
Condensation
Sublimation is the term for when a substance goes directly from being a solid to a gas. An example is dry ice, which is frozen carbon dioxide.
2.
What happens to salt when it is dissolved in water?
It disappears
It changes colour
It changes into a gas
It forms a solid at the bottom of the container
When salt is dissolved in water, it disappears because it has been broken down into its individual particles and mixed evenly into the water.
3.
What causes a substance to change state?
Size
Time
Temperature
Weight
Changes in temperature cause a substance to change state. For example, heating an ice cube causes it to melt into liquid water.
4.
In a solution, what do we call the substance in which the solute gets dissolved?
Solvent
Solute
Solution
Residue
A solvent is the substance that dissolves a solute in a solution. For example, in a sugar solution, water is the solvent.
5.
What is the purpose of a sieve in separating mixtures?
It dissolves substances
It separates liquids
It separates solids of different sizes
It changes the state of substances
A sieve separates solids that have different sizes. The smaller pieces will pass through the sieve, leaving the larger pieces trapped in it.
6.
What is an example of an irreversible change?
Melting ice
Freezing water
Mixing salt and water
Cooking an egg
Cooking an egg is an irreversible change because once you cook an egg, you cannot change it back to its uncooked state.
7.
In a solution, what do we call the substance that gets dissolved?
Solvent
Solute
Solution
Residue
A solute is the substance that gets dissolved in a solution. For example, in a sugar solution, sugar is the solute.
8.
What method would you use to separate sand from a sand and water mixture?
Evaporation
Sieve
Magneting
Filtering
Filtering would help separate sand from a sand and water mixture. The water would pass through the filter, leaving the sand behind.
9.
Can burning a piece of paper be reversed?
Yes
No
Depends on the type of paper
Only if it is done slowly
Burning is an irreversible change. Once a piece of paper is burnt, it cannot be turned back into a piece of paper.
10.
What is the process where a gas changes to a liquid?
Melting
Freezing
Sublimation
Condensation
Condensation is the process where a gas changes to a liquid. An example of this is when steam in the air turns back into water droplets.
Author:  Graeme Haw

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