Download CHEM 1110 Test 1 for Fall 2006: Study Questions and Answers - Prof. James B. Condon and more Exams Chemistry in PDF only on Docsity!
Circle the correct answer on the answer sheet.
NA = 6.022 × 10^23 mol –
- Give the answer to the following operation to the correct number of significant figures:
− ×
a. 4 % b. 4.2 % c. 4.18 % d. 4.181 % e. 4.1805 %
- Which is the property of a scientific theory?
a. It has been proven and is therefore credible. b. A theory is just that, it cannot be relied upon. c. It is predictive of things not observed yet. d. It is generally accepted. e. It must always have a known rate of error.
- An example of a homogeneous mixture would be:
a. a mixture of gasoline and water. b. whole milk. c. white latex paint. d. a salt and water solution. e. soil.
- Convert 5.7 km to micrometers (μm).
a. 5.7 × 10^3 μm b. 5.7 × 10^6 μm c. 5.7 × 10^9 μm d. 5.7 × 10–3^ μm e. 5.7 × 10–9^ μm
- Uranium has a density of 19.34 g mL–1. What is the volume of a 2.00 kg chunk of uranium?
a. 38.68 mL b. 0.01944 mL c. 0.0259 mL d. 52.5 mL e. 103 mL
- How many significant figure does the number 0.007 have?
a. 1 b. 2 c. 3 d. 4 e. 5
- What is the molar mass to the nearest 0.1 digit for NaCl?
a. 74.2 g mol –1^ b. 16.01 g mol –1^ c. 35.4 g mol –1^ d. 58.4 g mol –1^ e. 37.3 g mol –
8. How many grams are there in 60.0 mole of methane? (M = 16.0 g mol –1)
a. 60.0 g b. 0.267 g c. 1.04 mg d. 960 g e. 3.75 g
9. How many moles of Ar does one have if one has 1.1 × 10 25 atoms of Ar? (M = 40.0 g mol –1)
a. 6.6 × 10^48 mol b. 720 mol c. 18 mol d. 0.055 mol e. 4.4 × 10^26 mol
- How many neutrons and protons does Cobalt-60 (Co-60) have?
a. neutrons = 33, protons = 27 b. neutrons = 60, protons = 27 c. neutrons = 27, protons = 33 d. neutrons = 27, protons = 60 e. neutrons = 30, protons = 30
11. What is the percent of K, N and O in the compound KNO 3? (M(K) = 39.1 g mol –1,
M(N) = 14.0 g mol –1^ and M(O) = 16.0 g mol –1)
a. K = 56.6 %, N = 20.3 %, O = 23.2 % b. K = 39.1 %, N = 14.0 %, O = 16.0 % c. K = 27.1 %, N = 16.5 %, O = 56.5 % d. K = 45.9 %, N = 16.5 %, O = 37.6 % e. K = 38.7 %, N = 13.8 %, O = 47.5 %
- What is the empirical formula for a compound that is 72.4 % Fe and 27.6 % O?
(M(Fe) = 55.85 g mol –1, and M(O) = 16.0 g mol –1)
a. FeO b. Fe 2 O 3 c. Fe 3 O 2 d. Fe 4 O 3 e. Fe 3 O 4
- In the following reaction C 3 H 7 OH is in excess. How many moles of H 2 O are produced if 13.0 mol of O 2 react? 2C 3 H 7 OH + 9O 2! 6CO 2 + 8H 2 O a. 13.0 mol b. 11.6 mol c. 14.6 mol d. 9.75 mol e. 5.77 mol
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Answer Key
1.b 2.c 3.d 4.c 5.e 6.a 7.d 8.d 9.c 10.a 11.e 12.e 13.b 14.b 15.c 16.a 17.e 18.d 19.b 20.b
