CH1 The Nature of Chemistry

A  It prevents the collapse of microtubules.

B  It suppresses the activity of telomerase.

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

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

A  76 g

B  0.76 g

C  16 g

D  1.6 × 10–4 g

E  0.16 g

A  Sr

B  Ca

C  Ba

D  Cs

A  Ni, Ag, Au

B  Sc, Y, La

C  B, S, P

D  Cl, N, O

A  Conducts heat

B  Is malleable

C  Forms alloys

D  Has low density

A  Mg

B  Cm

C  Hg

D  Rg

A  Einstein

B  Bohr

C  Demokritos

D  Heisenberg

E  Dalton

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

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

A  A protein

B  A xenon atom

C  A sugar molecule

D  A muscle cell

A  HF

B  H2

C  F2

D  S8

A  An asphalt (blacktop) road

B  Sugar water

C  Clean air

D  Rubbing alcohol

A  melting point

B  flammability

C  density

D  color

E  atomic mass

A  Cellulose is not soluble in water.

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

C  The compound C2H6O has a density of 0.789 g/mL at 20°C.

D  Dry Ice sublimes (changes directly from a solid to a gas) at -78°C.

A  0.300 mL

B  83.3 mL

C  83.25 mL

D  3.330 mL

A  2.32 g/mL

B  0.942 g/mL

C  1.16 g/mL

D  0.862 g/mL

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

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

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

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

A  Good conductor of heat; takes shape of container

B  Conducts electricity well; compressible

C  Compressible; brittle

D  Has definite shape and volume; not compressible

A  A chemical compound containing cobalt and chlorine is blue.

B  The element chlorine boils at -34.6 °C

C  A chemical compound containing lead and sulfur forms shiny, plate-like, yellow crystals.

D  Aluminum metal is a conductor of electricity.

A  It predicts unknown results and it summarizes a wide range of experimental results.

B  It has not been contradicted by experiments.

C  It summarizes a wide range of experimental results.

D  It has not been contradicted by experiments, it predicts unknown results and it summarizes a wide range of experimental results.

A  Ozonation or chlorination

B  Coarse screening

C  Aeration

D  Treatment with slaked lime and alum

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

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

C  Chemistry, because it focuses on matter, is the foundation of all areas of science. High performance in chemistry classes is a strong indicator of potential success in fields such as medicine. Training in chemistry sharpens one’s ability to think quantitatively, abstractly, and nanoscopically.

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