Science Semester 1 Exam Review

Which statement about gases is NOT true?

• Gas particles have more kinetic energy than liquids.

• Gases have a definite shape.

• Gases fill all available space in a container.

• Water evaporates into a gas.

Samples of the air in our atmosphere (the air we breathe) were taken from all over the world. Each sample of clear gas contained about identical amounts of nitrogen, oxygen, argon, carbon dioxide, and other gasses. What is the best classification for the air in our atmosphere?

• liquid

• pure substance

• homogeneous mixture

• heterogeneous mixture

Which containers hold pure substances?

• I & II

• II & III

• III & IV

• II & IV

Based on the data in the table, this substance is most likely a what?

• Metal

• Nonmetal

• Metalloid

A teacher has 4 liquids, with the densities shown in the table. She carefully pours the water, corn syrup, rubbing alcohol, and vegetable oil into a beaker. The liquids form 4 layers in the beaker as shown below. Which would be Layer 3?

• Water

• Corn Syrup

• Rubbing Alcohol

• Vegetable Oil

Which three statements are true based off of the information provided in the graphic?

• If mercury were placed in the unknown liquid, it would sink.

• The unknown liquid is more dense than germanium.

• Lead is more dense than the unknown liquid.

• Iron is more dense than the unknown liquid.

• If lead was placed in the unknown liquid, it would float.

Yazmin is watching her teacher do an experiment. As she is observing, what should she be looking for to identify the experiment as a chemical change?

• A gas being produced.

• An unexpected color change.

• Change in thermal energy.

• Any of these changes can indicate a chemical change.

In the classroom demonstration shown, a rubber ball is dropped from Position 1. The ball bounces as shown. At which of these positions does the ball have both the greatest kinetic energy and the least potential energy? (Greatest Kinetic is at the LOWEST point)

• Position 1

• Position 2

• Position 3

• Position 4

Which object would have the most potential energy and why?

• Object 1 – because it is at a position that is higher than 2.

• Object 1 – because it is not moving at all.

• Object 2 – because it is at a position that is lower than 1.

• All the objects have the same amount of potential energy.

Which energy transformation example is true?

• A plant cell converts radiant energy into chemical energy through the process of photosynthesis.

• A solar panel converts radiant energy into electrical energy.

• A lightbulb converts electric energy into radiant energy.

• All of the above