Quiz 1

A scientific law:

- has no known contradictions - is generally accepted as true - has never been found to be in error

Which of the following is not equal to 0.35 centimeters?

0.00035 hm

Which of the following is not equal to 11.6 millimeters?

0.00116 m

Which of the following is not equal to 42.7 millimeters?

0.00427 m

8.97 x 10-3 = _____

0.00897

5.00 g of magnesium represents how many moles?

0.206 moles

0.000543 = _____

5.43 x 10 -4

Round 6.362 to 2 significant digits:

6.4

Which of the following measurements have 3 significant figures?

8,820 m 0.0882 m

Which of the following measurements has 4 significant figures?

800.0 g

0.0155 kg is the same as 15,500 mg.

True

8,740 cm3 is the same as 8.74 L.

True

The Kinetic Molecular Theory helps explain relationships:

between atoms, energy, temperature, and phases

Which is the correct measure of density?

g/cm^3

A gas occupies 200 mL at -73.0°C. To have the same gas occupy 300 mL, should the temperature be increased or decreased? What is the new temperature in Kelvins?

increased 300

Forming a hypothesis is accomplished through _____ reasoning.

inductive

The rocks and minerals of the earth consist of ______ compounds.

inorganic

An excellent tool to gauge the reliability of any theory is its capacity to generate accurate

predictions

A solution that contains maximum solute at a given temperature is:

saturated

A hypothesis which appears to be verified by multiple experiments and/or researchers may become a

theory

Which temperature conversion is correct?

°C = K - 273

Temperature is a measure of the _____ of a substance.

average kinetic energy of the molecules

1,670 cm3 = _____

1.67 L 1,670 mL

The substance that is dissolved in a solution is called a:

Solute

Charles's Law

is defined as the direct relationship between temperature and volume of gases such that as temperature (absolute scale) increases, volume increases by the same fraction of change.

Which properties are characteristic of true solutions?

- The light beam is unaffected. - The particles are dissolved.

A direct relationship occurs when:

- two variables decrease at the same time - two variables increase at the same time

125 K =

-148 C

Which of the following is not equal to 63 meters?

0.63 dkm

Which of the following measurements has 2 significant figures?

1 ŌO cm

Assuming these numbers are measurements, how many significant figures are allowed in the answer to this multiplication problem? (2.4 x 109) (4.0 x 1023)

2

Solve the following mole-mass problem. Refer to the periodic table. How much mass does 0.1 mole of neon contain?

2 g

Round 23.455 to 4 significant digits:

23.46

Solve the following mole-mass problem. Refer to the periodic table. How much mass does 0.50 mole of copper contain?

32 g

Which of the following is not equal to 0.0326 kilometers?

326,000 mm

63°C =

336 K

3.4 x 10 4= _____

34,000

A scientist wished to carry out a chemical reaction in which two moles of aluminum combine with three moles of sulfur. He has 2.70 g of aluminum to react. How many grams of sulfur must he use to satisfy all the aluminum atoms?

4.81 g

Assuming the volume of the insoluble substance to be 92.5 mL and the mass to be 693.8 g, what is the density of the substance? Be sure to use the correct number of significant figures.

7.50 g/mL

A 25-liter sample of steam at 100.0°C and 1 atm is cooled to 25.0°C and expanded until the pressure is 20.0 mm Hg. If no water condenses, calculate the final volume of the water vapor. V2 = _____ L

760

0.000626 L is the same as 6.26 cm3.

False

0.00726 g is the same as 0.726 mg.

False

Density is a chemical property.

False

Density is inversely proportional to pressure.

False

On the periodic table, elements are arranged according to their mass numbers.

False

Solution particles will eventually settle out.

False

The molecular weight of H2 and the mass of 1 mole of H2 are equal quantities.

True

The various components of a mixture do not combine chemically.

True

The scattering of light by a colloid is called the

Tyndall effect

The Law of Conservation of Mass states the mass of the products must be ____ the mass of the reactants in any chemical reaction

equal to

Water boils at a ____ temperature at a higher altitude than it does at sea level.

lower

Compounds that are found naturally in the earth are called:

minerals

The biosphere of the earth is made up of ____ compounds.

organic

What are the foundations of beliefs from which a person begins to reason called?

presupposition

Hardness is indirectly related to:

strength of chemical bonds

A mixture in which the particles eventually settle out is called a

suspension