Matter and Mixtures

Which is an example of a mixture that can be separated using a filter and funnel?

• Kool Aid

• Coca Cola

• Salt Water

• Sand and water mixture

When two or more substances combine, but each keeps its own properties, the new combination is called a(an)

• element

• mixture

• compound

• homogeneous substance

On a hot day, your friend brings you some iced tea to cool off. Only it is unsweetened. You add sugar, but it just does not dissolve fast enough. Which procedure would speed up the dissolving process?

• Add the sugar in the dark

• Add larger crystals of sugar or sugar cubes

• Take the tea up to the top of a close mountain

• Take out the ice and stir it outside where it is warmer

Suppose you have a container filled with iron and sand. You can separate the iron from the sand if you_____ so this is a ___________.

• use a magnet; mixture

• melt the sand; mixture

• add baking soda; chemical compound

• dissolve the sand in water; solution

When salt water is heated leaving behind solid salt, this is separating a mixture by what method?

• chromatography

• evaporation

• filtration

• sifting

When black marker is placed on filter paper and the mixture of the dyes separates, this is separating a mixture by what method?

• chromatography

• evaporation

• filtration

• sifting

In some water purification plants, solid matter is skimmed of the top of the water. This is separating a mixture by what method?

• chromatography

• evaporation

• flotation

• sifting

Usually, when the particle sized is decreased, what will happen to the rate of dissolving?

• It will stop.

• It will increase.

• It will decrease.

• It will remain constant.

Josh is designing a lab to separate a mixture of gravel, rocks, and sand. He looks at all the ways to separate the mixture, but decides that one way would work the best on the mixture. Which method should Josh use?

• density

• flitration

• evaporation

• magnetic attraction

Anna is making sweet tea for the class picnic. She boils the water and then soaks the tea bags to get the perfect color. She decides to add sugar to the tea to sweeten it and ice to make it cold. When should she add the sugar?

• after the tea cools to room temperature

• before the tea cools to room temperature

• it will not matter when she adds the sugar

• after the tea cools and ice cubes have been added