2.2 Properties of Water

When Amanda poured some of the liquid in a test tube, she noticed that the edges of the water curved upward, which is an example of (a)   .

When Pol filled another test tube to the top, the liquid formed a low dome, which is evidence of (a)   .

When Amanda added table salt to the first test tube and shook it, she noted that the liquid had dissolved the (a)   .

Tags

NGSS.MS-PS1-2

All of these indicated the presence of (a)   bonds.

Pol measured the pH of the sample to be 7, which is a (a)   value.

Based on all of the evidence Amanda and Pol gathered, the unknown liquid is (a)   .

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1

Which of the following observations BEST demonstrates water’s special property of cohesion?

• a spoon held near a stream of water from a tap deflects the water towards itself

• a drop of water behaves like glue to stick a slip of paper to a window

• water can dissolve other substances, such as sugar and salt

• water forms droplets of dew on a spider web in the morning

Blood is a mixture of a variety of materials. Some of the materials are dissolved in the fluid portion of blood. Other materials, such as blood cells, do not dissolve but move along with the blood. For these reasons, blood is an example of which type of mixture?

• a. a solvent

• b. a solution

• c. a suspension

• d. a buffer

Carrie is conducting an experiment on a solution. The solution’s initial pH is 3.2. Then, as Carrie gradually adds Compound X into the solution, the pH increases to 9.8. Which is the most likely identity of Compound X?

• a. a strong acid, such as hydrochloric acid (HCl)

• b. a strong base, such as sodium hydroxide (NaOH)

• c. a salt, such as sodium chloride (NaCl)

• d. a solvent, such as water (H₂O)