Semester 1 Review

Which of these numbers is the greatest?

• 5.7 x 10⁶

• 2.4 x 10⁶

• 8.1 x 10⁵

• 1.2 x 10⁷

Which of the following is an example of qualitative data.

• The mass of the sample is 12.5 grams

• The density of water is 1 g/cm³

• The chemical turned red during the reaction

• The temperature increased by 10 degrees Celsius during the reaction.

In an experiment testing how fertilizer affects plant growth, what is the independent variable?

• the fertilizer

• the plant growth

• sunlight

• the type of plant

Tags

NGSS.MS-ETS1-1

Scientists frequently replicate the experiments of other scientists. Why is this important in science?

• Replication of experiments helps confirm/verify results.

• Scientists often ask each other for help when performing experiments.

• Scientists frequently perform other scientists' experiments in order to practice their technique.

• Replicating experiments is an effective way of making sure a laboratory is in optimal condition.

Tags

NGSS.MS-PS2-5

Jane Goodall was a famous primatologist who studied the social interactions of primates for decades. Which best explains why she chose to do systematic observations instead of controlled experiments to gather data?

• She wanted to observe the interactions between primates in their natural habitats.

• She wanted to see how changing one variable affected the primates' behavior.

• Primates are unable to be controlled.

• Controlled experiments are hard and she was lazy.

Tags

NGSS.MS-LS2-2

Andrea adds a clear liquid, a green liquid, and a black liquid to a beaker. She observes the liquids after 5 minutes. The clear liquid is on top of the green liquid, and the green liquid is on top of the black liquid. What is the order of density of the liquids, from highest to lowest?

• Black>Green>Clear

• Black>Clear>Green

• Clear>Green>Black

• Green>Black>Clear

Jane measures a piece of metal and determines it has a mass of 10 grams and a volume of 2 mL. What is the density of the piece of metal?

• 20 g/mL

• 10 g/mL

• 5 g/mL

• 0.2 g/mL

When solid S1 is heated, it breaks up into gas G and another solid S2. The solids S1 and S2 and the gas G are all pure substances. On the basis of this information alone, which substance or substances must be compounds?

• S1

• S2

• S1 and S2

• S1 and G

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

When a candle is lit, the wick burns, the wax melts, the candle changes shape, and the air around the candle heats up. Which of the following is an example of a chemical change?

• the wick burning

• the wax melting

• the candle changing shape

• the air heating up

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What type of reaction does the graph show?

• Exothermic

• Endothermic

Tags

NGSS.MS-PS1-4