SM and H2O Review

What is the most important property of water and makes all of the other properties of water possible?

• cohesion

• surface tension

• polarity

• high specific heat

What allows water to move from the roots to the leaves, against gravity?

• less density as a solid

• capillary action

• surface tension

• ability to dissolve many substances

A student wants to test whether a new type of fertilizer makes bean plants grow taller. She sets up the following experiment: Group A: 10 bean plants with the new fertilizer. Group B: 10 bean plants with double the amount of the new fertilizer. After 4 weeks, she measures the height of the plants in both groups. What is the major flaw in this experimental design?

• She did not measure the plants for a long enough time.

• She used too many plants in each group.

• She should have used more than one type of plant

• She does not have a control group without fertilizer.

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

A graph shows the number of bacterial colonies decreasing as the pH moves away from 7. What conclusion can be drawn?

• The bacteria thrive in acidic conditions.

• The bacteria thrive in basic conditions.

• The bacteria thrive in neutral conditions.

• The bacteria cannot survive at any pH level.

Tags

NGSS.MS-LS1-5

Laws ______ what happens under specific conditions, while theories _____ why it happens

• describe; explain

• explain, descibe

• prove; disprove

• disprove; prove

Tags

NGSS.HS-PS2-1

How can we increase the validity of an experiment?

• change more than one variable

• all variables in the control and experimental groups are the same

• make sure the experimental group has a higher number of test subjects than the control group

• repeat the experiment or increase the sample size

A student wants to investigate if sugar concentration affects yeast fermentation. Which of the following is a valid hypothesis?

• Does sugar concentration affect yeast fermentation?

• If different types of sugars are used, then the rate of yeast fermentation will be affected.

• Will the amount of yeast affect fermentation?

• If sugar concentration increases, then the rate of yeast fermentation will increase.

Tags

NGSS.HS-PS1-5

What is the dependent variable in an experiment testing the effect of fertilizer on plant growth?

• The amount of fertilizer used

• The height of the plants

• The type of soil used

• The amount of sunlight received

Tags

NGSS.MS-LS1-5

During the winter, a lake freezes over. Even though the surface is covered in ice, fish are still able to swim and survive underneath. Which property of water allows the fish to stay alive under the ice?

• Water becomes denser as it cools below 4°C, so ice floats on the surface.

• Water conducts heat extremely well, keeping the entire lake from freezing.

• Water is less dense as a solid than as a liquid, so ice floats on the surface.

• Water does not evaporate in cold temperatures, so the lake stays liquid.

Tags

NGSS.MS-PS1-4

How many variables should be changed in an experiment?

• 1

• 2

• 3

• 4