Parts of an Experiment & Properties of Water

Front

Hydrogen bonds are VERY important in determining the many properties of this very important molecule.

Back

Water

Front

The Hydrogen atoms in the molecule shown have this charge:

Back

Positive

Front

Large bodies of water, such as lakes and oceans, do not quickly fluctuate in temperature. What is the reason for this phenomenon?

Back

Water has a high heat capacity.

Front

Why does ice stay at the top of oceans instead of sinking to the bottom?

Back

Ice is less dense than liquid water.

Front

Which property of water allows insects to walk on its surface without sinking?

Back

Surface tension due to hydrogen bonding

Front

What type of bond is responsible for the cohesion between water molecules?

Back

Hydrogen bond

Front

Why is water considered a polar molecule?

Back

It has an uneven distribution of charges across the molecule.

Front

Why are control groups important?

Back

They provide a basis of comparison.

Front

What is the dependent variable in Rebecca’s experiment?

Back

amount of starch

Answer explanation

The dependent variable in Rebecca's experiment is the amount of starch, as it is what she measures to determine the effect of different light conditions on the seedlings. The other options are not being measured.

Front

Independent variable in an experiment testing the effect of vitamin D on mice growth.

Back

type of injection given

Answer explanation

The independent variable is the factor that is changed in an experiment. In this case, the 'type of injection given' (vitamin D vs. saline) is what the scientist manipulates to observe its effect on the growth of the mice.