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1. What is the primary purpose of using evaporation to separate mixtures?
A
To increase the mixture's temperature
B
To mix different substances together
C
To separate a dissolved solid from a liquid
2. Which of the following mixtures can be separated using evaporation?
A
Salt and water
B
Sand and stones
C
Iron and aluminum
3. What happens to the liquid in a mixture when it undergoes the process of evaporation?
A
it solidifies into crystals
B
It turns into a gas and disappears
C
It becomes a different liquid
4. In a saltwater solution, what is left behind after the water has evaporated?
A
Both the salt and water
B
Nothing is left behind
C
Only the salt
5. Why does evaporation work as a separation method for mixtures?
A
Because it cools down the mixture
B
Because the solid particles are left behind as the liquid turns into a gas
C
ecause it causes the mixture to explode
6. What is sieving used for in the process of separating mixtures?
A
To dissolve substances
B
to separate solids of different sizes
C
to heat materials
7. Which of the following is a common use of sieving in gardening?
A
Mixing different types of soil
B
Separating weeds from plants
C
Measuring sunlight exposure
8. Why is it important to sieve flour before baking?
A
To add nutrients to the flour
B
To make the flour finer and smoother
C
To remove unwanted flavors
9. Which of the following mixtures can be separated effectively using a sieve?
A
Salt dissolved in water
B
Sugar mixed with lemon juice
C
Sand and pebbles
10. What is sieving used for in science and everyday life?
A
Separating mixtures of small and large particles
B
Heating substances to change their properties
C
Separating liquids from solids