ChemCom Unit IA PRACTICE Test

Transcription

1 Name: Class: _ Date: _ ChemCom Unit IA PRACTICE Test Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of the following observations would predict a physical change? a. rusting of my car c. crashing my car b. burning gasoline in my car d. having my car dissolve due to acid rain 2. Which of these is a chemical property? a. melting point c. freezing point b. flamibility with oxygen d. density 3. Properties such as luster, malleability, and electrical conductivity, density, melting and boiling point, color, freezing point, are examples of a. chemical properties c. physical properties b. nuclear properties d. electrical properties 4. What is the formula for finding density? a. mass / weight c. temperature / mass b. volume / pressure d. mass / volume 5. A change in which new bonds are formed resulting in new substances is called a. a phase change c. a chemical change b. a nuclear change d. a physical change 6. Which of these observations is evidence of a chemical change? a. Ice forms on a lake b. The color of a liquid is blue c. Water evaporates after being spilled. d. A pop can rusts when burried in the ground 7. The following statements describe properties of oxygen: 1. Oxygen reacts with iron to form rust 2. Oxygen has a lower density than air 3. Oxygen is a colorless gas Which of the three properties in the statement are describe physical properties? a. 1 b. 2 c. 3 d. 1 and 2 e. 2 and 3 1

2 Name: 8. Fact 1: Iron has a tendancy to rust when exposed to oxygen and water. Fact 2: Iron is malleable The Fact 1 describes a, and the Fact 2 describes a. a. physical change; physical property b. chemical property; physical property c. physical property; chemical change 9. Which of these characteristics is not a physical property? a. harder than a penny c. density of water is 1.0 g/ml b. shiny silver luster d. reacts with HCl(aq) 10. Which change does not show a phyical change? a. crushing crystals c. burning a candle b. cutting paper d. melting a candle 11. Use the following balanced equation to answer the following question. 2 KBr + 2 H 2 SO 4 + MnO 2 K 2 SO 4 + MnSO H 2 O + Br 2 The number 2 in the formula of 2 KBr is called a. a coefficient c. an exponent b. a subscript d. a scientific notation 12. Use the following balanced equation to answer the following question. 2 KBr + 2 H 2 SO 4 + MnO 2 K 2 SO 4 + MnSO H 2 O + Br 2 The number 2 in the formula H 2 SO 4 is called a. a coefficient c. an exponent b. a subscript d. a scientific notation. 13. When two or more different elements are mixed but not bonded together are called a. a mixture c. a colloid b. a compound d. a solution 14. Which substance is an example of a compound? a. CaO(g) c. Na(s) b. Ni(s) d. N2(g) 2

3 Name: 15. Which term below is the best classification for neon gas Ne? a. compound c. atom b. element 16. Which term below would be the best classification for propane H 2 O 2? a. compound c. mixture b. element d. atom 17. In a the chemical reaction below on the right of the arrow are the, and on the left of the arrow are the _. 2 KBr + 2 H 2 SO 4 + MnO 2 K 2 SO 4 + MnSO H 2 O + Br 2 a. reactants, products c. subscripts, coefficients b. products, reactants 18. What is the formula of the molecule shown below? Hydrogen Carbon a. C3H3O3N b. C8H9O2N c. C8(H)9ON2 d. CHNO 3

4 Name: 19. Which of the following models could represent oxygen, H 2 O? a. c. b. d. 20. Only a few elements on the periodic table can be classified as a. metals or gases. c. metalloids b. metals or nonmetals. d. solids or liquids. 21. Which property below is characteristic of a solid metal element? a. pearly luster c. malleable b. brittle d. non-conductor of electricity 22. How many total atoms of Oxygen would be needed to build one formula unit of, Ca(NO 3 ) 2? a. 2 c. 4 b. 3 d How many total atoms of sulfur would be needed to build one formula unit of, Al 2 (SO 4 ) 3? a. 2 c. 4 b. 3 d Calculate the density of the object above: mass = 24 grams volume = 12 ml a. 0.5 g/ml c. 2 g/ml b g/ml d. 370 g/ml 4

5 Name: 25. What is the mass of the liquid in the graduated cylinder? Mass of the empty cylinder = grams Mass of the cylinder and the liquid = grams a grams c grams b grams d grams 26. What is the density of the liquid in the graduated cylinder below? Mass of the liquid in the graduated cylinder = grams a grams/ml c. 1.0 grams/ml b grams/ml d grams/ml 5

6 Name: 27. What is the volume of the toy that was put into the graduated cylinder below? a. 1.3mL c. 3.4 ml b. 1.6 ml d. 5.0 ml 28. What is the slope of the copper density data in the graph below? a. 8 grams/ml c. 0.5 grams/ml b. 4 grams/ml d grams/ml 6

7 Name: Matching Based on the observations below, classify each element as a metal, non-metal, or metaloid. Element Name Luster Conductivity Malleability Classification Potassium Metallic 9 ohms Malleable???? Q 34 Boron Metallic 2 ohms Brittle???? Q 35 Sulfur Earthy non-cond Brittle???? Q 36 Copper Metallic 10 ohms Malleable???? Q 37 Answer Choices a. Metal c. Metalloid b. Non-Metal 29. Potassium 30. Boron 31. Sulfur 32. Copper 7