Temperature

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Unit 2 Question Packet Name …………………KEY……………………… Matter & Energy Period ………….

Skills
1. classifying types of matter
2.interpreting particle diagrams
3.identifying physical & chemical properties of matter

4. separating Mixtures
5.converting Temperatures
6.identifying physical & chemical changes in matter
Skill #1: Classifying types of matter - refer to your notes and RB p. 1-2

Classify each of the following with the combination of terms listed below.
pure substance – elementmixture – homogeneous
pure substance – compound mixture – heterogeneous

1. HCl (aq) mixture – homogeneous2. sugarpure substance – compound

3. KBr (s) pure substance – compound4. soil mixture – heterogeneous

5. Cl2 (g)pure substance – element6. waterpure substance – compound

7. CH2(OH)2 (aq) mixture – homogeneous8. sodium pure substance – element

9. Hg (l) pure substance – element10. iron oxide pure substance – compound

11.NH3 (l) pure substance – compound12. salt water mixture – homogeneous

13. Matter that is composed of two or more different elements chemically combined in a fixed proportion is classified as (1) a compound    (2) an element       (3) a mixture(4) a solution

14.A compound differs from an element in that a compound 1) is homogeneous(3) has a definite composition 2) has a definite melting point(4) can be decomposed by a chemical reaction

15.A compound differs from a mixture in that a compound always has a (1) homogeneous composition(3) minimum of three elements (2) maximum of two elements(4) heterogeneous composition

16.A heterogeneous material may be
1) an element(2) a compound(3) a pure substance (4) a mixture

17.Which statement is an identifying characteristic of a mixture? (1) a mixture can consist of a single element
(2) a mixture can be separated by physical means
(3) a mixture must have a definite composition by weight (4) a mixture must be homogeneous

18.Which must be a mixture of substances?
(1) solid(2) liquid(3) gas(4) solution

19.Which substance can be decomposed by chemical means?
(1) aluminum      (2) octane          (3) silicon(4) xenon

20.Which substance can be decomposed by chemical means?
(1) ammonia    (2) oxygen       (3) phosphorus(4) silicon

21.Which substance can not be broken down by a chemical reaction? (1) ammonia          (2) argon              (3) methane(4) water

22.Two substances, A and Z, are to be identified. Substance A can not be broken down by a chemical change. Substance Z can be broken down by a chemical change. What can be concluded about these substances?

(1) Both substances are elements.
(2) Both substances are compounds.
(3) Substance A is an element and substance Z is a compound. (4) Substance A is a compound and substance Z is an element.

23.Tetrachloromethane, CCl4, is classified as a

(1) compound because the atoms of the elements are combined in a fixed proportion (2) compound because the atoms of the elements are combined in a proportion that varies (3) mixture because the atoms of the elements are combined in a fixed proportion (4) mixture because the atoms of the elements are combined in a proportion that varies

24.Two different samples decompose when heated. Only one of the samples is soluble in water. Based on this information, these two samples are

(1) both the same element(2) two different elements
(3) both the same compound(4) two different compounds

25.The table below shows the mass and
volume data for four samples of
substances at the same temperature...
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