Chemistry



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Second Quarter Chemistry Progress Assessment Study Guide - Spring 2012

Using Scientific Measurements

Multiple Choice:

1) The true volume of a liquid sample is 8.4125 mL. A student measures the volume of this sample three times and records readings of 8.42 mL, 8.41 mL, and 8.40 mL. The student’s readings are: (choose one)

a. Accurate b. Precise c. both d. neither

2) The true volume of a liquid sample is 8.4125 mL. A student measures the volume of this sample three times and records readings of 8.92 mL, 8.93 mL, and 8.94 mL. The student’s readings are: (choose one)

a. Accurate b. Precise c. both d. neither

3) The true volume of a liquid sample is 8.4125 mL. A student measures the volume of this sample three times and records readings of 8.92 mL, 8.41 mL, and 9.34 mL. The student’s readings are: (choose one)

b. Accurate b. Precise c. both d. neither

Diagram: Refer to the following three scales (A, B, C) for questions # 4 - 6

Scale A:

_______|___________|____________|____________|____________|___________|_________

10 20 30 40 50 60

Scale B:

_|_____|______|______|______|______|______|_____|_____|______|______|______|______|___

10 11 12 13 14 15

Scale C:

__|_____|______|______|______|______|______|______|______|______|______|______|______|____

10.4 10.5 10.6 10.7 10.8 10.9

4) Which scale will have readings up to three ( 3 ) significant figures?

a) Scale A b) Scale B c) Scale C

5) Which scale will have readings up to two ( 2 ) significant figures?

a) Scale A b) Scale B c) Scale C

6) Which scale will have readings up to one ( 1 ) significant figures?

a) Scale A b) Scale B c) Scale C

True or False:

7) T / F : A set of measurements can be precise without being accurate.

8) T / F : A set of measurements can be accurate without being precise.

9) T / F : A single measurement amongst a set of measurements can be accurate without the set being accurate.

10) T / F : A single measurement amongst a set of measurements can be precise without the set being precise.

11) T / F : A single measurement amongst a set of measurements can be precise without the set being accurate.

*** continued ***

True or False: ( continued )

12) T / F : Exact conversion factors have no uncertainty numbers.

13) T / F : Exact numbers can be considered to have an unlimited number of sig figs.

Rounding Off: For each of the following numbers, choose which answer is correctly rounded to 4 sig figs.

14) 42.6854 g = a. 42.69 g b. 42.68 g c. 42.67 g

15) 17.3356 m = a. 17.32 m b. 17.33 m c. 17.34 m

16) 2.7851 cm = a. 2.784 cm b. 2.785 cm c. 2.786 cm

17) 4.6350 kg = a. 4.634 kg b. 4.635 kg c. 4.636 kg

18) 78.6544 mL = a. 78.64 mL b. 78.65 mL c. 78.66 mL

Multiple Choice: Determine the number of significant figures in each of the following measurement examples.

19) 60.0 K = a. 1 b. 2 c. 3 d. 4 e. 5

20) 0.06 g = a. 1 b. 2 c. 3 d. 4 e. 5

21) 0.0047 L = a. 1 b. 2 c. 3 d. 4 e. 5

22) 0.8 g = a. 1 b. 2 c. 3 d. 4 e. 5

23) 8.0 g = a. 1 b. 2 c. 3 d. 4 e. 5

24) 300 m = a. 1 b. 2 c. 3 d. 4 e. 5

25) 438 g = a. 1 b. 2 c. 3 d. 4 e. 5

Calculations: Calculate the following and select the correct answer.

26) 213.67 m + 98 m = a. 311.67 m b. 310 m c. 312 m d. 311.6 m e. 311.7 m

27) 107.38 km – 65 km = a. 42.38 km b. 42 km c. 43 km d. 42.0 km e. 42.3 km

28) 12.0 cm x 4.3 cm = a. 51.6 cm2 b. 51.0 cm2 c. 52 cm2 d. 52.0 cm2 e. 51.5 cm2

29) 1002.5 g ÷ 25 = a. 40 b. 40.0 c. 40.1 d. 41 e. 41.0

Multiple Choice: For each number, select the correct Scientific Notation for it.

30) 4,325,045.2 = a. 4.32 x 106 b. 43.25 x 105 c. 4.32 x 105 d. 432 x 106

31) 0.00000361 = a. .361 x 105 b. 36.1 x 10-5 c. 3.61 x 10-6 d. 361 x 10-8

Multiple Choice: For each Scientific Notation, select the correct number for it.

32) 2.31 x 10-6 = a. .0000000231 b. .000000231 c. 0.0000231 d. 0.00000231

33) 5.3 x 104 = a. 53000.00 b. 53,000 c. 53,000.00 d. 5,300.00

*** continued ***

Solving Quantitative Problems

Calculations:

34) Calculate the number of seconds in exactly one week.

a. 604,800 b. 64,800 c. 60,800 d. 6,480 e. 60,400

35) What is the volume of a 20 g piece of Beryllium? (d = 1.85 g/cm3 )

a. 1.08 cm3 b. 10.8 cm3 c. 10.81 cm3 d. 10.82 cm3 e. 10.9 cm3

36) An object travels at a speed of 7500 cm / s. How far will it travel in a day?

a. 648,000,000 cm b. 6,480,000 m c. 6.48 x 108 cm d. 6,480 km e. all of the above

Lab 5

Match-up:

37) Law of Multiple Proportions A- A law used in science that states: Matter can neither be created nor destroyed.

38) Law of Conservation of Mass B- A law used in science that states: If two or more different compounds are composed of the same two elements, the masses of the second element combined with a certain mass of the first element can be expressed as ratios of small whole numbers.

39) Law of Definite Composition C- A law used in science that states: Energy can neither be created nor destroyed.

40) Law of Conservation of Energy D- A law used in science that states: Every chemical compound has a definite composition by mass.

Multiple Choice:

41) The reason why we measure everything three times is so that we can get an accurate _____________ ?

a) total b) average c) sum d) amount

42) If your empty evaporating dish weighs 40 g and then it weighs 48 g after you put a substance in it, what is the weight of the substance?

a) .40 g b) .8 g c) 48 g d) 8 g e) 40 g

43) When the weight of a substance you are heating and weighing and heating and weighing, etc. stops changing, you have reached that substance’s ______________ weight.

a) ultimate b) permanent c) atomic d) calculated e) constant

44) How many times in a row at minimum does the weight measurement need to be the same in order to show that a substance’s weight has stopped changing?

a) 1 b) 2 c) 3 d) 4 e) 5

45) In Lab 5, the blue hydrated copper (II) sulfate turned white when heated because:

a) copper ash is white in color.

b) oxygen reacted with the sulfur turning the copper white.

c) the heat evaporated the H2O making the copper (II) sulfate no longer hydrated.

d) the heat converted the copper into calcium.

*** continued ***

Lab 5 ( continued )

46) In Lab 5, what happened to the copper (II) sulfate in the test tube, which turned white after it was heated, when water was added back into the test tube?

a) It turned blue again b) It exploded c) It glowed d) It made noise

47) In Lab 5, why did the weight of your copper (II) sulfate change as you heated it?

a) The H2O evaporated b) The oxygen was separated from the sulfur and released as gas

c) The hydrogen was converted from a liquid to a gas d) all of the above

Lab 6

Identify the Cation in the following compounds:

48) NaCl a) Na b) Cl c) NaCl d) none of the above

49) CuSO4 a) Cu b) S c) O4 d) SO4 e) CuS

Identify the Anion in the following compounds:

50) NaCl a) Na b) Cl c) NaCl d) none of the above

51) CuSO4 a) Cu b) S c) O4 d) SO4 e) CuS

52) H2NO3 a) H2 b) N c) O3 d) NO3 e) H2N

Determine the formula for the following compounds:

53) Sodium Chloride a) NaCl b) Na2Cl c) NaCl2 d) Na2Cl2

54) Copper ( II ) Sulfate a) CuSO b) Cu2SO c) CuSO2 d) CuSO4 e) Cu2S2O2

Determine the compound name for the following formulas:

55) KO2 a- Potassium bioxide b- Potassium dioxide c- Potassium oxide

56) CaO3 a- Calcium oxide b- Calcium dioxide c- Calcium trioxide

Identify whether the following ionic compounds are positively charged or negatively charged:

57) KO2 a- positive b- negative c- neutral

58) Ca2O3 a- positive b- negative c- neutral

59) NaCl a- positive b- negative c- neutral

The Chemistry of Life

Match-up:

____ 60- Biochemistry A- Large organic molecules.

____ 61- Macromolecules B- The study of the chemical reactions that go on in living things.

____ 62- Functional Group C- Clusters of atoms that behave in particular ways.

Proteins

Match-up:

____ 63- Proteins A - Protein molecules that act as catalysts.

____ 64- Amino Acid B - An enzyme that performs the same task over and over on a particular set of parts.

____ 65- Enzymes C - The molecules produced by an enzyme reaction.

____ 66- Substrates D – Macromolecules formed by condensation reactions between amino acids.

____ 67- Products E – An acid that has a carboxyl group and an amino group, both attached to the same carbon atom and hydrogen atom.

*** continued ***

Proteins ( continued )

True or False:

68) T / F : Insulin was one of the first proteins for which the protein structure was determined.

69) T / F : Proteins are made up of long, unbranched chains of amino acids.

70) T / F : A finished peptide chain usually contains at most 100 amino acids.

71) T / F : The most common peptide chain structure is a coil formed by part of the chain and is known as a delta helix.

72) T / F : Several amino acids within a peptide chain must be changed in order to change a protein’s structure and what it does.

73) T / F : Like enzymes, coenzymes and minerals are limited on how many times they can be used.

Carbohydrates

Match-up:

____ 74- Carbohydrates A – The monomers of carbohydrates such as simple sugars like fructose and glucose.

____ 75- Monosaccharides B – Sugars, starches, and related compounds that supply energy or structural molecules.

____ 76- Disaccharide C – Many monosaccharides that are joined together.

____ 77- Polysaccharide D – Two, and only two, monosaccharides that are joined together.

Carbohydrates ( continued )

Match-up:

____ 78- Glycogen A – A structural polysaccharide composed of glucose with a nitrogen-containing group attached.

____ 79- Starch B – An important polysaccharide made of glucose that allows animals to store energy.

____ 80- Cellulose C – A structural polysaccharide made from glucose that is the main building material in plants.

____ 81- Chitin D – The polysaccharide that is used to store energy in plants.

Diagram: On the back of your scantron test sheet, diagram the formation of a Dipeptide from two amino acids. Include any R groups that would be attached and any excess products. ( 24 points )

END

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