Questions and Answers of General Chemistry

A graduated cylinder weighed 68.1 g. To the cylinder was added 58.2 g of water and 5.279 g of sodium chloride. What was the total mass of the cylinder and the solution? Express the answer to the
A beaker weighed 53.10 g. To the beaker was added 5.348 g of iron pellets and 56.1 g of hydrochloric acid. What was the total mass of the beaker and the mixture (before reaction)? Express the answer
The astronomical unit equals the mean distance between the earth and the sun. This distance is 150,000,000 km, which is precise to three significant figures. Express this in scientific notation to
The circumference of the earth at the equator is 40,000 km. This value is precise to two significant figures. Write this in scientific notation to express correctly the number of significant figures.
For each of the following, decide whether a physical or a chemical change is involved.a. Dissolving of sugar in waterb. Rusting of ironc. Burning of woodd. Evaporation of alcohol
For each of the following, decide whether a physical or a chemical change is involved.a. Dissolving of sugar in waterb. Rusting of ironc. Burning of woodd. Evaporation of alcohol
Which of the following are physical changes and which are chemical changes?a. Melting of sodium chlorideb. Pulverizing of rock saltc. Burning of sulfurd. Dissolving of salt in water
Give the normal state (solid, liquid, or gas) of each of the following.a. Potassium hydrogen tartrate (cream of tartar)b. Leadc. Carbon (diamond)d. Bromine
Give the normal state (solid, liquid, or gas) of each of the following.a. Sodium hydrogen carbonate (baking soda)b. Isopropyl alcohol (rubbing alcohol)c. Oxygend. Copper
You are presented with a piece of metal in a jar. It is your job to determine what the metal is. What are some physical properties that you could measure in order to determine the type of metal? You
Imagine that you get the chance to shoot five arrows at each of the targets depicted below. On each of the targets, indicate the pattern that the five arrows make whena. You have poor accuracy and
a. Sodium metal is partially melted. What are the two phases present?b. A sample of sand is composed of granules of quartz (silicon dioxide) and seashells (calcium carbonate). The sand is mixed with
Which of the following represents the smallest mass?a. 23 cgb. 2.3 × 103 μgc. 0.23 mgd. 0.23 ge. 2.3 × 10-2 kg
A 75.0-g sample of a pure liquid, liquid A, with a density of 3.00 g/mL is mixed with a 50.0-mL sample of a pure liquid, liquid B, with a density of 2.00 g/mL. What is the total volume of the
You perform an experiment in the lab and determine that there are 36.3 inches in a meter. Using this experimental value, how many millimeters are there in 1.34 feet?a. 4.43 × 102 mmb. 4.05 × 102
When the quantity 12.9 g is added to 2 × 10-02 g, how many significant figures should be reported in the answer?a. Oneb. Twoc. Threed. Foure. Five
What distinguishes an element from a compound? Can a compound also be an element?
What phases or states of matter are present in a glass of bubbling carbonated beverage that contains ice cubes?
Characterize gases, liquids, and solids in terms of compressibility and fluidity.

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