Ch 2 Practice Chemistry

Which of the following observations is qualitative?

• a. The pH of a liquid is 5.

• b. A chemical reaction is complete in 2.3 seconds.

• c. Gas vapors are given off from an evaporated liquid.

• The solid has a mass of 23.4 grams.

Quantitative observations are recorded using

• a. numerical information.

• b. a system.

• c. non-numerical information

• a control

Tags

NGSS.MS-PS3-1

All of the following describe a unit EXCEPT

• a. the choice of unit depends on the quantity being measured.

• b. a unit is usually not important in finding a solution to a problem.

• c. a unit is usually preceded by a number.

• d. a unit compares what is being measured with a previously defined size

The validity of scientific concepts is evaluated by

• a. providing explanations.

• b. voting by scientists.

• c. testing hypotheses

• d. collecting facts

Tags

NGSS.HS-LS3-2

NGSS.HS-PS2-5

The symbol cm represents

• a. micrometer.

• b. centimeter.

• c. centigram

• d. centiliter

The mL is defined as

• a. 1000 cm³.

• b. 1 cm³

• c. 0.1 cm³

• 0.001 cm³

All of the following are examples of units EXCEPT

• a. gram

• b. teaspoon

• c. volume

• d. kilometer

The SI base unit for length is the

• a. micrometer.

• b. kilometer.

• c. meter

• d. centimeter

The base unit abbreviation for time is

• a. sec.

• b. hr.

• c. s.

• d. h.

The symbol that represents the measured unit for volume is

• a. mL.

• b. cm.

• c. mg.

• d. mmol.