Question: Gerry used a paper filter to separate a mixture of sand, salt, and water. Think about particle size and answer this question: Why did the salt go through the filter while the sand got caught?
Reference answer: The dissolved salt particles are small enough to go through the holes in the filter paper, but the sand particles are too large.

Student answer: Because the salt was too small so small that you cannot see it.

Student answer: Because sand is much softer and the salt.

Student answer: Because the salt dissolved into the water and the sand did not.

Student answer: Because salt and water are a solution but sand and water is just a mixture.

Student answer: The sand got caught because it had rocks in it.

Student answer: The salt went through because when the salt and water mixed the salt dissolved a little.

Student answer: The particle size of the sand was too big to fit through the holes of the filter. While the salt particle size was too small to get caught.

Student answer: The salt did not get caught because it dissolved in the water.

Student answer: The salt went through the filter because it dissolved and the sand did not.

Student answer: Because he put water in it so the salt dissolved with the water and ran right through.

Student answer: Because salt is so small it slid through the large coffee filter. Sand is larger so it stuck to the filter.

Student answer: The salt turns to liquid like an ice cube and then to water sand does not.

Student answer: The sand was too big to fit through the tiny holes in the filter. The salt dissolved into the water and was way too small to get caught in the filter. It just went through.

Student answer: The salt went through the filter because the salt mix with water to make saltwater. Sand the sand got caught because it is just like the powder it sticks to the sides.

Student answer: The salt is smaller and is harder.

Student answer: The salt had gone away or dissolved.

Student answer: Because the sand is bigger than the salt.

Student answer: The grains of salt must be smaller than the grains of sand.

Student answer: The salt got dissolved in the water.

Student answer: Because the sand is thicker than the water. Water is smooth.

Student answer: Because the filter has smaller holes so whatever big particle will be separated.

Student answer: Maybe because in the little dish there is little holes and it will not go through it.

Student answer: The salt was small enough to go through the holes while the sand was too big to go through.

Student answer: The sand cannot go through because the water would not let the sand dissolve.

Student answer: It stayed there because of its size.

Student answer: Because the salt evaporated so it could go through and still have salt in it. While sand did not so it could not go through.

Student answer: Because salt can dissolve but sand is tiny parts of the ground.

Student answer: Because the salt dissolved in the water and the sand did not.

Student answer: Because the salt is evaporated already and the sand cannot because it is hard and it is gravel.

Student answer: The salt became a part of the water so it dissolve in the water so the salt went with the water. But the sand did not dissolve in the water because it was so bulky.

Student answer: The salt dissolved and became smaller. The sand became mud and got caught together and stayed on top.

Student answer: They have a sticky stuff that did not work.