Separating Mixtures

Question 1

A scientist has a mixture of salt dissolved in water. Which method should she use to separate the salt from the water?

Accepted Answer

Evaporating the mixture

Answer

Filtering the mixture through a piece of cloth

Answer

Using a magnet to pull out the salt

Answer

Sieving the mixture with a fine mesh

Question 2

Jack scoops up a mixture of smooth pebbles and tiny plastic beads from his sandbox. Which technique will best separate the pebbles from the beads?

Accepted Answer

Pour the mixture through a sieve

Answer

Filter it with a coffee filter

Answer

Heat it until the liquid evaporates

Answer

Use a magnet to pull out the pebbles

Question 3

Lena has a jar that holds a mixture of three things: big pieces of dried corn kernels, fine sand, and a sweet liquid where sugar is completely dissolved. She wants to end up with the corn kernels, the sand, and the solid sugar each in separate piles. Which series of steps, in the correct order, will let her do this?

Accepted Answer

Sieving, then filtering, then evaporating

Answer

Filtering, then sieving, then evaporating

Answer

Evaporating, then sieving, then filtering

Answer

Sieving, then evaporating, then filtering

Try three questions

A scientist has a mixture of salt dissolved in water. Which method should she use to separate the salt from the water?

Jack scoops up a mixture of smooth pebbles and tiny plastic beads from his sandbox. Which technique will best separate the pebbles from the beads?

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