1. Chapter 1: Matter and Energy
Unit #1: INTRODUCTION
INTERNET REVIEW GAME
Chapter 1: Matter and Energy
Chemistry Is a Physical Science
Matter and Its Properties
Elements

2. Q1: Define a physical property
Q1: Define a physical property. List two examples of physical properties.
Answer: A property that can be observed or measured without changing the identity of the substance. Examples include color, odor, length, size and melting point.

3. Q2: How can you tell the difference between an element and a compound?
Answer: Compounds can be separated into elements by chemical means. Elements cannot be separated into simpler substances by chemical means.

4. a. physical, because the wood remains wood
Q3: Identify each of the following as either a physical change or a chemical change. Explain your answers. a. A piece of wood sawed in half b. Milk turns sour c. Melted butter solidifies in the refrigerator
Answer:
a. physical, because the wood remains wood
b. chemical, because the milk changes composition, as signified by the change in flavor
c. physical, because the butter remains butter

5. Q4: Write a brief paragraph that shows that you understand the following terms and relationships between them: atom, molecule, compound and element
Answer: A molecule is the smallest unit of a substance that keeps all of the physical and chemical properties of that substance. An element is composed of molecules that can be single atoms or more than one kind of the same atom. A compound is composed of two or more elements, so a molecule of a compound is made up of two or more different kinds of atoms.

6. Q5: Pick an object that you can see right now
Q5: Pick an object that you can see right now. List three of the object’s physical properties that you can observe. Can you also observe a chemical property of the object? Explain you answer.
Answer: Obviously your answers will vary. Physical properties include shape, texture, state of matter, and taste. Chemical properties could not be observed unless a chemical change was attempted.

7. Answer: c. magnesium and hydrochloric acid
Q6: Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas. The reactants in this reaction are a. magnesium and magnesium chloride b. hydrochloric acid and hydrogen gas c. magnesium and hydrochloric acid d. magnesium chloride and hydrogen gas
Answer: c. magnesium and hydrochloric acid

8. Q7: Matter that has a definite shape and a definite volume is. a
Q7: Matter that has a definite shape and a definite volume is a. a liquid b. an element c. a solid d. a gas
Answer: c. a solid

9. Answer: d. its composition can vary
Q8: We know that air is a mixture and not a compound because a. it can be heated to a higher temperature b. it can be compressed to a smaller volume c. it is colorless d. its composition can vary
Answer: d. its composition can vary

10. Answer: b. has mass and volume
Q9: Matter can be defined as anything that a. has weight b. has mass and volume c. is uniform throughout d. exhibits both chemical and physical properties
Answer: b. has mass and volume

11. Q10: Which of the following is best classified as a homogenous mixture
Q10: Which of the following is best classified as a homogenous mixture? a. pizza b. blood c. hot tea d. copper wire
Answer: c. hot tea

12. Q11: A compound differs from a mixture in that a compound. a
Q11: A compound differs from a mixture in that a compound a. contains only one element b. varies in chemical composition depending on the sample size c. has a definite composition by mass of elements that the compound contains d. can be classified as either heterogeneous or homogeneous
Answer: c. has a definite composition by mass of elements that the compound contains

13. Q12: Which of the following is not a physical state of matter? a. solid b. gas c. element d. liquid
Answer: c. element

14. Q13: Three of the following must contain two or more kinds of atoms
Q13: Three of the following must contain two or more kinds of atoms. Which one does not contain two or more kinds of atoms? a. element b. compound c. homogeneous mixture d. heterogeneous mixture
Answer: a. element

15. Answer: b. copper is actually Cu
Q14: Which of the following symbols does not match the element given? a. Al, Aluminum b. Co, copper c. K, potassium d. P, phosphorus
Answer: b. copper is actually Cu

16. Q15: In trying to identify a sample of a pure substance, we observe the following properties. Tel whether each one is a chemical property or a physical property. a. Its mass is g b. It is a shiny solid at room temperature c. It is easily etched by nitric acid d. It melts when heated to 670oC e. It is 31.7 centimeters long f. It is a good heat conductor g. It burns in air h. It is a good conductor of electrical energy
Answer: Observations c and g are chemical properties; the others are physical properties

17. Q16: Describe the difference between a chemical change and a physical change. Give one example of each kind of change.
Answer: In a chemical change, one or more of substances are converted into different substances. A physical change does not involve a change in the identity of the substances present. Examples will vary.

18. Q17: Describe general properties of metals, nonmetals and metalloids.
Answer:
Metals: shiny, good conductors of heat; good conductors of electricity; malleable or ductile; most are solids at room temperature.
Nonmetals: poor conductors of heat and electricity; many are gases at room temperature; those that are solids are brittle rather than malleable or ductile.
Metalloids: properties are between those of metals and nonmetals.; less malleable than metals but not as brittle as solid nonmetals; most are semiconductors of electricity.