Question

instructional science long test (term 1) kankakee high school

1. salt mixed with water is a:

a) compound
b) mixture
c) element
d) gas

1. which of the following is a chemical change?

a) cutting paper
b) melting ice
c) burning wood
d) freezing water

1. matter is anything that has:

a) energy and heat
b) mass and volume
c) shape and size
d) weight and color

1. which tool is best for measuring small amounts of liquid accurately?

a) beaker
b) pipette
c) erlenmeyer flask
d) mortar and pestle

1. when water boils and becomes steam, this is a change of:

a) phase
b) chemical identity
c) mass
d) element

Explanation:

1. Salt mixed with water can be separated by physical means like evaporation, so it's a mixture.
2. Burning wood results in the formation of new substances like ash and carbon - dioxide, which is a chemical change. Cutting paper, melting ice, and freezing water are physical changes.
3. Matter is defined as anything that has mass and volume.
4. A pipette is used for accurately measuring small amounts of liquid. A beaker and Erlenmeyer flask are for holding and mixing liquids, and a mortar and pestle are for grinding solids.
5. When water boils and becomes steam, it changes from the liquid phase to the gas phase, which is a phase change.

Answer:

1. b) Mixture
2. c) Burning wood
3. b) Mass and volume
4. b) Pipette
5. a) Phase