Prince George Community College » Chemistry » Chem 1010 - General Chemistry 1 » Fall 2021

Chem 1010 - General Chemistry 1 » Fall 2021 » CH1 The Nature of Chemistry (2)

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Question #1

Your chemistry grade often has a significant impact on your ability to pursue certain careers. Choose the statement that best summarizes why this might be true.

A. Chemistry, because it focuses on matter, is the foundation of all areas of science.

B. All the answers are true

C. High performance in chemistry classes is a strong indicator of potential success in fields such as medicine.

D. Training in chemistry sharpens one's ability to think quantitatively, abstractly, and nanoscopically.

Question #2

Choose the step in water purification that is intended to form a colloidal gel trapping fine particles in water prepared for drinking.

A. Tank storage

B. Aeration

C. Treatment with slaked lime and alum

D. Ozonation or chlorination

Question #3

Which of these statements is characteristic of a law?

A. It summarizes a wide range of experimental results.

B. It predicts unknown results.

C. It has not been contradicted by experiments.

D. All the answers are correct

Question #4

Which of these is a qualitative statement?

A. Hydrogen is found as a diatomic molecule.

B. Carbon has six protons.

C. Water has a freezing point of 32°F.

D. Sodium chloride is soluble in water.

Question #5

Choose the statement which is true about physical properties.

A. The measurement of physical properties always involves a phase change.

B. Physical properties depend on the mass of the material being considered.

C. One important physical property is whether a substance is degraded by exposure to oxygen.

D. The measurement of physical properties does not break any bonds.

Question #6

Which of these Celsius temperatures is close to typical room temperature?

A. 72 °C

B. 98 °C

C. 37 °C

D. 22 °C

Question #7

To determine the density of a liquid, the volume of a 20.9 g sample of the liquid was measured to be 24.30 mL at 22.5°C. Calculate the density of the liquid at this temperature to the proper number of significant figures.

A. 0.929 g/mL

B. 2.33 g/mL

C. 1.16 g/mL

D. 0.860 g/mL

Question #8

Which is the correct proportionality factor relating pm (picometer) and m?

A. 109 pm / 1 m

B. 1012 pm / 1 m

C. 1 pm / 1012 m

D. 1015 pm = 1 mm

Question #9

Choose the chemical property.

A. Water boils at 100°C.

B. Acetylene, C2H2, burns in air to form carbon dioxide, CO2, and water, H2O.

C. Table salt is soluble in water.

D. The compound H2O has a density of 0.998 g/mL at 20°C.

Question #10

Which of the following is a chemical change?

A. Dissolving table salt into water

B. Hard-boiling an egg in a pan of hot water

C. Grinding iron into filings

D. Melting an ice cube

Question #11

Which of the following is a heterogeneous mixture?

A. Rubbing alcohol

B. An asphalt (blacktop) road

C. Distilled water

D. Salt water

Question #12

Which species below is a chemical compound?

A. P4

B. O2

C. HF

D. C60

Question #13

Which of the following is not a nanoscale object?

A. A muscle cell

B. A protein

C. A water molecule

D. An oxygen atom

Question #14

Which of these statements is a nanoscale interpretation of temperature?

A. Temperature indicates the amount of heat present in the sample whose temperature was measured.

B. Temperature is a measure of how vigorously the particles in the sample are rotating, vibrating, or moving about.

C. Temperature can be measured in Kelvin, centigrade, or Fahrenheit degrees with equal precision.

D. Heat flows from a body of higher temperature to one of lower temperature.

Question #15

In the early 1800's, the atomic theory of matter was proposed by:

A. Demokritos

B. Dalton

C. Kelvin

D. Bohr

E. Thomson

Question #16

What is the symbol for mercury ?

A. Hg

B. Mg

C. Cm

D. Rg

Question #17

Which is not a property of metals?

A. Conducts heat

B. Conducts electricity

C. Has low density

D. Is malleable

Question #18

Choose the set of elements that all exist as diatomic molecules.

A. F, Na, Co

B. Zn, Cd, Al

C. Cl, N, O

D. C, S, P

Question #19

Which of these alkaline earths is in the fifth period of the periodic table?

A. Rb

B. Ba

C. Sr

D. Ca

Question #20

Manganese makes up 1.3 × 10–4 percent by mass of the elements found in a normal healthy body. How many grams of manganese would be found in the body of a person weighing 256 lb? (2.205 lb = 1 kg)

A. 1.5 × 10–4 g

B. 0.73 g

C. 73 g

D. 15 g

E. 0.15 g

Question #21

Choose the mechanism by which paclitaxel inhibits cancer cell replication.

A. It suppresses the activity of telomerase.

B. It prevents the collapse of microtubules.

C. It cross-links DNA at critical locations to prevent transcription.

D. It intercalates between base pairs to stiffen the DNA strand.

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