Chemistry Exam Semester 1 Part A

30. The only pure substance listed below is A. bread dough B. vinegar C. vitamin C (ascorbic acid) D. seawater

C

2. Inorganic chemistry is the study of... A. non-carbon related compounds B. the chemistry of living things C. mathematical modeling D. the identification of the composition of materials

A

21. Noble gases are in Group 18, and are best known because they are A. unreactive B. excellent conductors C. rare D. lanthanides

A

32. If a mixture is uniform in composition, it is said to be A. homogeneous B. chemically bonded C. heterogeneous D. a compound

A

41. A nonmetal is usually A. brittle B. malleable C. a good conductor D. used to make jewelery

A

53. All of the following are examples of units except A. mass B. kilometer C. gram D. ounce

A

10. The two most important properties of all matter are A. the ability to carry an electric current well and to hold electric charge B. taking up space and having mass C. being brittle and hard D. being malleable and ductile

B

12. A compound is A. a pure substance that cannot be broken down into simpler, stable substances B. a substance, made of two or more atoms that are chemically bonded, that can be broken down into simpler, stable substances C. the smallest unit of matter that maintains its chemical identity D. any substance, whether it is chemically bonded or not

B

14. Matter includes all of the following except A. air B. light C. smoke D. water vapor

B

22. Nitrogen monoxide and oxygen, both colorless gases, form a red-brown gas when mixed. Nitrogen monoxide and oxygen are called the A. products B. equilibria C. synthetics D. reactants

B

23. A state of matter in which a material has no definite shape but has a definite volume is the ___ state. A. gas B. liquid C. plasma D. solid

B

27. Plasma is the fourth state of matter. In the plasma state A. atoms gain electrons B. atoms lose electrons C. atoms form molecules D. atomic nuclei break down

B

34. If a mixture is not uniform throughout, it is called A. homogeneous B. heterogeneous C. chemically bonded D. a solution

B

37. All known chemical elements are organized into groups based on similar chemical properties in the A. chemical chart B. periodic chart C. element table D. none of the above

B

42. Metalloids are often A. unreactive B. semiconductors C. lanthanides D. from outer space

B

44. Which of the following observations is quantitative? A. the liquid turns blue litmus paper red B. the liquid boils at 100oC C. the liquid tastes bitter D. the liquid is cloudy

B

47. A theory is best described as A. series of experimental observations B. generalization that explains a body of known facts or phenomena C. scientifically proven fact D. testable statement

B

49. A theory is accepted as the explanation of an observed phenomenon until A. one study contradicts the theory B. repeated observations conflict with the theory C. a new method is discovered D. a leading scientist declares that it is invalid

B

50. Standards of measurement are chosen because they A. can be related to everyday objects B. are reproducible in another laboratory C. cannot be destroyed by any common physical or chemical means. D. are easily changed

B

9. Which of the following is an intensive property of matter? A. amount of energy B. density C. volume D. mass

B

1. A chemical can be defined as... A. a toxic substance B. an unnatural additive placed in food C. any substance that has a definite composition D. any substance that is not alive

C

16. A student recorded the following while completing an experiment Color of substance: yellow, shiny powder Effect of magnet: yellow, shiny powder was attracted The student should classify the substance as a(n) A. element B. compound C. mixture D. plasma

C

18. Which of the following is NOT a chemical change? A. rusting B. igniting C. melting D. burning

C

26. A solid substance is A. always frozen regardless of its container B. always a crystal regardless of its container C. always the same shape regardless of its container D. always losing particles regardless of its container

C

28. What happens to the energy in a substance when it changes state? A. It is destroyed B. it is changed into matter C. it changes form, but is neither destroyed nor increased D. the energy remains unchanged

C

29. Which part of the illustration below shows the particles in a heterogeneous mixture? A. a B. b C. c D. d

C

31. A mixture is A. a combination of pure substances bonded chemically B. any substance with a uniform composition C. a blend of any two or more kinds of matter, as long as each maintains its own unique properties D. any group of elements that are chemically bonded to one another

C

33. A homogeneous mixture is also called A. chemically bonded B. a compound C. a solution D. a solute

C

35. Which of the following is an example of a heterogeneous mixture? A. a gold ring B. seawater C. granite D. sucrose

C

38. The vertical columns on the periodic table are called A. periods B. rows C. groups D. elements

C

43. All of the following are steps in the scientific method EXCEPT A. observing and recording data B. forming a hypothesis C. discarding data inconsistent with the hypothesis D. developing a model based on experimental results

C

51. Which of these statements does NOT describe a measurement standard? A. measurement standards avoid ambiguity B. measurement standards must be unchanging C. A standard can be easily changed to suit the experiment D. confusion is eliminated when the correct measurement is applied

C

52. Which of these statements about units of measurement is NOT true? A. a unit compares what is being measured with a previously defined quantity B. a unit is usually preceded by a number C. measurements can be compared without knowing their units D. the choice of unit depends on the quantity being measured

C

54. Which of these is NOT an SI base unit? A. kilogram B. second C. liter D. Kelvin

C

8. Which of the following is an extensive property of matter? A. Melting point B. Boiling point C. Volume D. Density

C

13. A measure of the quantity of matter is A. density B. weight C. volume D. mass

D

15. A true statement about mass is that A. mass is often measured with a spring scale B. mass is expressed in pounds C. as the force of Earth's gravity on an object increases, the object's mass increases D. mass is determined by comparing the mass of an object with a set of standard masses that are part of a balance

D

17. Which of the following is NOT a physical change? A. grinding B. cutting C. boiling D. burning

D

19. A chemical change occurs when A. dissolved minerals solidify to form a crystal B. ethanol is purified through distillation C. salt deposits form from evaporated seawater D. a leaf changes color in the fall

D

20. A physical change occurs when a A. peach spoils B. silver bowl tarnishes C. bracelet turns your wrist green D. glue gun melts a glue stick

D

25. The liquid state of matter can be described as A. having a definite shape and definite volume B. having neither a definite shape nor a definite volume C. having lost electrons owing to energy content D. having a definite volume but not a definite shape

D

36. Which of the following is an example of a homogeneous mixture? A. air B. orange juice C. raw milk D. marble

D

39. The horizontal rows on the periodic table are called A. actinides B. families C. elements D. periods

D

40. It is easy to determine whether a substance is a metal if the substance is A. easy to break down into its components B. very hard C. very brittle D. a good electrical and hear conductor

D

45. Which of the following observations is qualitative? A. a chemical reaction was complete in 2.3 seconds B. the solid had a mass of 23.4 grams C. the pH of a liquid was 5 D. salt crystals formed as the liquid evaporated

D

46. A statement that can be tested experimentally is a A. variable B. model C. generalization D. hypothesis

D

48. A plausible explanation of a body of observed natural phenomenon until A. control B. experiment C. law D. theory

D

11. An atom is A. the smallest unit of matter that maintains its chemical identity B. the smallest unit of a compound C. always made of carbon D. smaller than an electron

a

7. Applied research is usually performed... A. to solve a particular problem B. by accident C. to learn basic information D. in order to make money

a

3. Biochemisty is the study of... A. properties, changes, and relationships between energy and matter B. the chemistry of living things C. crystals and minerals D. carbon-containing compounds

b

5. Technological development often occurs... A. by accident B. long after the basis research is complete C. in order to learn basic infomation D. only to make money

b

24. Under ordinary conditions of temperature and pressure, the particles in a gas are A. closely packed B. very far from one another C. held in fixed positions D unevenly distributed

c

6. Basic research is usually performed... A. to develop new products B. to understand an environmental problem C. to gain knowledge D. to solve a particular problem

c

4. Organic chemistry is the study of... A. properties, changes, and relationships between energy and matter B. the chemistry of living things C. crystals and minerals D. carbon-containing compounds

d