They'll learn how to apply concepts with the help of worked out examples. In addition, Chemistry in Action features and conceptual questions checks brings together the understanding of chemistry and relates chemistry to things health professionals experience on a regular basis.
To help students visualize approaches to problem solving, the solutions manual contains original artwork. Yes, the number of significant digits depends on the precision of each of the individual measurements and the calculated value may have more or fewer significant figures than the original measurements as long as the precision is no greater than the measurement with the lowest precision.
An example of a calculation with an increase in significant figures is in example 2. In this case, the farther the astronaut is from the earth the less gravitational force is pulling on him or her. Less gravitational attraction means the astronaut will weigh less. The mass of the astronaut is the amount of matter that makes up him or her. This does not change as the astronaut moves away from the earth.
They are equivalent units. Heat is a form of energy, while temperature is a measure of the intensity of heat how hot the system is. The number of degrees between the freezing and boiling point of water are Fahrenheit Celsius Kelvin. The three materials would sort out according to their densities with the most dense mercury at the bottom and the least dense glycerin at the top. In the cylinder, the solid magnesium would sink in the glycerin and float on the liquid mercury.
Order of increasing density: ethyl alcohol, vegetable oil, salt, lead. The density of ice must be less than 0. Density is the ratio of the mass of a substance to the volume occupied by that mass.
Density has the units of mass over volume. Specific gravity is the ratio no units of the density of a substance to the density of a reference substance usually water at a specific temperature for solids and liquids. Specific gravity has no units. The density of water is 1. However, when water changes from a liquid to a solid at 0 C there is actually an increase in volume. The density of ice at 0 C is 0.
Therefore, ice floats in water because solid water is less dense than liquid water. If you collect a container of oxygen gas, you should store it with the mouth up.
If two substances have the same mass, the one with the greater volume will have the greater density. Answer: False; Difficulty: hard; Reference: Section 2. The prefix kilo means A solid with a specific gravity of 0. Answer: True; Difficulty: medium; Reference: Section 2. The meter is a unit of length. The mass of a substance is independent of its location. The density of liquid A is 2. When equal masses of these liquids are compared, liquid A will have the greater volume.
A volume of Two substances A and B occupy the same volume. The mass of substance A is half that of substance B. Therefore, the density of substance A is lower than the density of substance B. Answer: True; Difficulty: hard; Reference: Section 2. Two substances A and B have the same mass. Substance A occupies half the volume of substance B.
The significant figures in a number include all the digits that are certain plus the first uncertain digit. The kilogram is the SI unit for mass. Free Response A student determines the density of a solid by weighing it and then immersing it in The following data is obtained: Weight Volume of water and solid. Answer the following based on the preceding information.
Answers should have units and be rounded to the proper number of significant figures. What is the volume of the solid? What is the density of the solid? What is the specific gravity of the solid?
Will the solid float or sink in water? Answer: A. The volume of the solid is 8. The density of the solid is 4. The specific gravity of the solid is 4. The solid will sink in water; Difficulty: easy; Reference: Section 2. A student determines the density of a liquid by weighing an empty graduated cylinder, adding The following data is obtained: Weight of the empty cylinder Weight of the cylinder and liquid.
What is the mass of the liquid? What is the specific gravity of the liquid? Will the liquid float or sink in water? The mass of the liquid is The density of the liquid is 0. The specific gravity of the liquid is 0. The liquid will float on water; Difficulty: easy; Reference: Section 2.
What is the difference between mass and weight? Which property, mass or weight, is better to use in science to describe a substance? Why is this true? What instruments are used to measure mass and weight? Answer: Mass is the amount of matter present in an object. It is better to use mass to describe a substance. Mass is better to use because it does not vary in different gravitational fields.
Weight varies as the force of gravity changes; C. Mass is measured with a balance. Weight is measured with a scale; Difficulty: medium; Reference: Section 2.
The density of ethanol is 0. What is the mass of one pint of ethanol? Answer: The mass of one pint of ethanol is A rectangular solid has a mass of 1. The solid measures 4. Answer: The density of the solid is 2. Of these three: four degrees Fahrenheit, four degrees Kelvin, and minus four degrees Celsius, which is the warmest? Answer: The warmest temperature is minus four degrees Celsius; Difficulty: medium; Reference: Section 2. What is the appropriate SI unit to express each of the following properties?
The surface area of a gymnasium floor. The volume of air in a dining room. The thickness of a quarter. The volume of liquid in a wine bottle.
The height of a redwood tree.
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