Chem final review

A 125 mL aqueous solution contains 1.86 mc032-1.jpg 10-5 g of potassium chloride and has a density of 1.02 g/mL. What is the concentration in ppm? Use mc032-2.jpg. 1.46 mc032-3.jpg 10-7 ppm 1.82 mc032-4.jpg 10-5 ppm 0.146 ppm 18.2 ppm

0.146 ppm

The molar mass of water (H2O) is 18.0 g/mol. A sample of water has a mass of 18.0 g. How many moles of water are contained in this sample? 1.00 18.0 36.0 324

1.00

Consider the equation for the formation of water. 2H2 + O2 mc009-1.jpg 2H2O What is the theoretical yield of H2O if 130 g of H2O is produced from 18 g of H2 and an excess of O2? 18 g 81 g 130 g 160 g

160 g

A chemist dilutes a 1.0 mL sample of 2.0 M KNO3 by adding water to it. If the concentration of the solution that is obtained is 0.0080 M, what is its volume? Use mc016-1.jpg. 125 mL 250 mL 500 mL 2,000 mL

250 mL

Which describes a step in the process of forming an ionic bond? A metal atom loses electrons and becomes a positive ion. A metal atom gains electrons and becomes a negative ion. A nonmetal atom loses electrons and becomes a negative ion. A nonmetal atom gains electrons and becomes a positive ion.

A metal atom loses electrons and becomes a positive ion.

Which is a postulate of the kinetic-molecular theory? Gas particles have a small volume relative to the spaces between them. Gas particles have a large volume relative to the spaces between them. Gas particles are very small in size and always move slowly. Gas particles are very large in size and always move slowly.

Gas particles have a small volume relative to the spaces between them.

Which statement describes a chemical property of water? It reacts with sodium metal. It has a melting point of 0°C. It has a density of about 1 g/mL. It is clear and colorless.

It reacts with sodium metal.

What should the IUPAC name for a binary covalent compound lack? prefixes Roman numerals an -ide ending the name of a nonmetal

Roman numerals

Why do amorphous solids not have a long-range order in the arrangement of their particles? Their formation involves very rapid cooling. They do not have enough particles. Their particles eventually change positions. Their particles always stay in the same positions.

Their formation involves very rapid cooling.

Which is a property of covalent compounds? They ionize in solution. They tend to be very hard. They have a low boiling point. They have a high melting point.

They have a low boiling point.

Which shows the electron configuration for zinc (Zn)? [Kr]5s24d10 [Kr]5s24d6 [Ar]4s23d9 [Ar]4s23d10

[Ar]4s23d10

Henry plans to monitor the change in concentration of an acid during a chemical reaction. He wants to collect data every 0.1 seconds and then to graph his data and insert it into a text document. Which pair of tools would be best for Henry to use? a computer and pH paper pH paper and a graphing calculator a computer and a concentration probe a graphing calculator and a concentration probe

a computer and a concentration probe

Brownian motion is not observed in a mixture that includes two phases. Which best identifies the mixture? a colloid a suspension a solution an alloy

a suspension

In an investigation that uses the scientific method, which step immediately follows asking a question? presenting the results making observations creating a hypothesis designing an experiment

creating a hypothesis

Which of these factors will cause a solid solute to dissolve faster? increasing the air temperature increasing the amount of solute increasing the amount of solvent increasing the surface area of solute

increasing the surface area of solute

What name should be used for the ionic compound KOH? potassium oxide potassium oxygen hydride potassium hydroxide potassium hydrogen oxide

potassium hydroxide

Which factor influences both solubility and the rate of dissolution? pressure temperature particle size nature of solvent

temperature

Which of the following best explains freezing point depression? the decrease in the freezing point of a solution as a function of the number of particles that are dissolved in the solution the temperature at which the vapor pressure of a liquid equals the atmospheric pressure the increase in the boiling point of a solution as a function of the number of particles that are dissolved in the solution the increase in the freezing point of a solution as a function of the number of particles that are dissolved in the solution

the decrease in the freezing point of a solution as a function of the number of particles that are dissolved in the solution

Which of these properties is the best one to use for identification of an element? the number of neutrons in the atomic nucleus the number of protons in the atomic nucleus the number of isotopes that are formed by the element the number of charges on ions of the element

the number of protons in the atomic nucleus

The IUPAC name for NF3 should have which of the following? the prefix "tri" before nitrogen the Roman numeral (III) after nitrogen the Roman numeral (III) after fluoride the prefix "tri" before fluoride

the prefix "tri" before fluoride