In the Space Provided, Write the Letter of the Term Or Phrase That Best Completes Each

Name Class Date

Assessment

Unit 2 Review

Matter

In the space provided, write the letter of the term or phrase that best completes each statement or best answers each question.

___ 1. Which of the following is an example of a chemical property?

a. reactivity with oxygen c. density

b. solubility in water d. color

2. Which of the following is not an example of a physical property?

a. freezing point c. boiling point

b. reactivity d. density

3. Knowing the chemical properties of a substance will tell you how the substance

a. looks. c. smells.

b. can be broken down into atoms. d. reacts with other substances.

_ 4. Which of the following is an example of a physical change?

a. dissolving salt in water c. burning wood into charcoal

b. cooking an egg d. rusting iron

_____ 5. The different substances in a mixture

a. keep their properties c. form new molecules

b. combine chemically d. cannot be separated

______ 6. Which of the following results on a mixture?

a. baking a cake c. dissolving salt

b. burning a log d. digesting food

______ 7. Which of the following is not an example of a physical property?

a. freezing point c. boiling point

b. reactivity d. density

______ 8. Stainless steel has chemical properties such as

a. hardness. c. high melting point.

b. resistance to rust. d. electrical conductivity.

______ 9. In a exothermic reaction, energy is transferred from

a. the reactants to the surroundings

b. the surroundings to the reactants

c. one reactant to the other

d. the container to the chemical

______ 10. According to the the Law of Conservation of Mass, in a balanced

chemical equation, the total mass of the products always equals the

a. molar mass of the reactants

b. atomic mass of the reactants

c. total mass of the reactants

d. proportional masses of the reactants

Read each statement, and write in the blank the word or words that best completes the statement.

mixture chemical reaction products composition reactants yeilds compound equation physical chemical

11. A _________________________ is a change in which one or more substances are converted into new substances.

12. A chemical _________________________ is a way to describe a chemical reaction using chemical formulas and other symbols.

13. In a chemical equation, the substances on the left side of the arrow that react are the starting substances called _________________________.

14. The substances on the right side of the arrow are the substances produced from the reaction called _________________________.

15. The arrow means produces, or ________________.

16. A chemical change is a change in the ____________________ of a substance.

17. A change in color during a reaction is often a sign that a(n) _________________________ change has occurred.

18. The components of a(n) _________________________ can be separated because they are not chemically combined.

19. Explain how to change the rate of a chemical reaction.

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20. Explain what it means to say that a chemical change is a change in composition. Give an example of a process that causes a chemical change, and state what changes occur.

21. Explain how to change the rate of a chemical reaction.

22. What are physical properties?

23. What are chemical properties?

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24. What is the difference between physical and chemical properties?

25. What’s a physical change?

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26. What’s a chemical change?

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27. What are two or more elements combined called?

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28. How do you know a chemical reaction took place? (list the 5 signs of a chemical reaction)

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29. Is rust a physical or chemical change? Explain your answer.

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30. What is an endothermic reaction?

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31. What is an exothermic reaction?

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32. Going from a solid to a gas is an endothermic or an exothermic reaction? Why?

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33. Are cold temperatures a sign of endothermic or exothermic reaction? Why?

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34. What is a reactant?

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35. What is a product?

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36. What does the arrow indicate in a chemical equation?

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37. What is the difference between a heterogeneous mixture and a homogeneous solution?

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38. A mixture is not a chemical change. Why?

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39. What is the law of conservation of mass?

40. How does the law of conservation of mass relate to the baking soda and vinegar bag lab?

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41. In bonding – a ionic bond (a metal/non metal) the elements gain or lose electrons. True or false? Explain your answer. Draw an ionic compound using valence electrons

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42. In bonding – a covalent bond (2 non metals) always share electrons. True or false? Explain your answer. Draw a covalent compound.

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43. If you have a piece of paper, how would you make it undergo a physical change? ______________________________________________________________________________________________________________________________________________________________________________________________________

44. If you have a piece of paper, how would you make it undergo a chemical change?

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Holt Science Spectrum 33 Matter