Matter, Investigation 1 Review

What is a mixture?

• Words used to describe an objects physical characteristics.
• When a solid material dissolves in a liquid.
• a combination of two or more materials that are put together that
    can be easily separated.
• The weight of an object.

A mixture is made with 50 mL of water and 25 g of solid. The solid disappears, the water stays clear.
What is the mass of the solution now?

• 100 g
• 75 g
• 50 g
• 25 g

Complete the sentences and mathematical equations below. If a volume of water is 55 mL, its mass is _________________. 

• 55 g
• 75 g
• 50 g
• 25 g

Using the picture of the balance, the mass of the solution must be _____ .

• 45 g
• 70 g
• 30 g
• 20 g

Knowing the particle size of the materials in a mixture helps you know __________.

• the weight of the mixture
• which tools to use to separate the mixture
• what color the solution will be
• what the crystals will look like

What is a solution?

• A change of state from a liquid to a gas.
• A natural form of a material.
• When a solid disappears in a liquid and becomes transparent.
• A mixture of 2 or more materials that CAN NOT be easily
    separated.

What is a solute used to make hot chocolate?

• water
• chocolate powder
• milk

A cup contains a mixture of nails, salt, and gravel.  You want to separate the materials so each one is in its own cup.  What is the first tool you should use to separate the materials?

• a screen
• a magnet
• a coffee filter
• evaporation dish

A student dissolves 5 g of salt in 50 g of water. The solution is then heated on a hot plate to speed evaporation. When the water evaporates completely, how much salt will be left?

• 5 g
• 50 g
• 55 g
• 15 g

How do you know when a solute has dissolved in a solvent?

• A color change occurs.
• The solvent (liquid) evaporates
• The solute (solid) disappears in a solvent (liquid) and becomes transparent.