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

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

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

D. All the answers are true

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. Aeration

B. Ozonation or chlorination

C. Treatment with slaked lime and alum

D. Tank storage

Question #3

Which of these statements is characteristic of a law?

A. All the answers are correct

B. It predicts unknown results.

C. It has not been contradicted by experiments.

D. It summarizes a wide range of experimental results.

Question #4

Which of these is a qualitative statement?

A. Sodium chloride is soluble in water.

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

C. Carbon has six protons.

D. Hydrogen is found as a diatomic molecule.

Question #5

Choose the statement which is true about physical properties.

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

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

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

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. 37 °C

B. 22 °C

C. 72 °C

D. 98 °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. 1.16 g/mL

C. 0.860 g/mL

D. 2.33 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. 1015 pm = 1 mm

D. 1 pm / 1012 m

Question #9

Choose the chemical property.

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

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

C. Table salt is soluble in water.

D. Water boils at 100°C.

Question #10

Which of the following is a chemical change?

A. Grinding iron into filings

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

C. Dissolving table salt into water

D. Melting an ice cube

Question #11

Which of the following is a heterogeneous mixture?

A. Rubbing alcohol

B. Salt water

C. An asphalt (blacktop) road

D. Distilled water

Question #12

Which species below is a chemical compound?

A. C60

B. O2

C. HF

D. P4

Question #13

Which of the following is not a nanoscale object?

A. A water molecule

B. An oxygen atom

C. A protein

D. A muscle cell

Question #14

Which of these statements is a nanoscale interpretation of temperature?

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

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

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

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

Question #15

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

A. Thomson

B. Bohr

C. Demokritos

D. Dalton

E. Kelvin

Question #16

What is the symbol for mercury ?

A. Rg

B. Cm

C. Hg

D. Mg

Question #17

Which is not a property of metals?

A. Is malleable

B. Has low density

C. Conducts heat

D. Conducts electricity

Question #18

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

A. Cl, N, O

B. C, S, P

C. Zn, Cd, Al

D. F, Na, Co

Question #19

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

A. Ca

B. Sr

C. Rb

D. Ba

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. 0.73 g

B. 73 g

C. 0.15 g

D. 15 g

E. 1.5 × 10–4 g

Question #21

Choose the mechanism by which paclitaxel inhibits cancer cell replication.

A. It prevents the collapse of microtubules.

B. It suppresses the activity of telomerase.

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

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

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