Macomb Community CollegeCHEM 1050Final exam answers only1. Which of the following is a property of both gases and liquids? B) indefinite shape The description “two substances present, two phases present” is correct for A) heterogeneous mixtures. An element is a substance which D) cannot be broken down into simpler substances by chemical means. A pure substance H is found to change upon h
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Final exam answers only
1. Which of the following is a property of both gases and liquids?
B) indefinite shape
The description “two substances present, two phases present” is correct for
A) heterogeneous mixtures.
An element is a substance which
D) cannot be broken down into simpler substances by chemical means.
A pure substance H is found to change upon heating into two new pure substances P and
W. Both P and W may be decomposed by chemical means. From this we may conclude
that
D) H, P and W are all compounds
The most abundant elements in the universe and the earth's crust are, respectively,
D) hydrogen and oxygen.
In which of the following sequences of elements do each of the elements have a twoletter
chemical symbol?
B) krypton, nickel, rubidium
In which of the following sequences of elements do each of the elements have a one letter
chemical symbol?
B) fluorine, carbon, sulfur
Which of the following pairings of chemical formulas and "molecular descriptions" is incorrect?
D) SiO2 and "diatomic"
In which of the following pairs of chemical formulas do both formulas represent compounds?
D) N2O4 and NO2
Which of the following is a correct description for a sample of ice cubes in water?
C) two phases present, one substance present
Consider the chemical formulas CoI2 and COI2. It is true that they
C) contain different kinds and numbers of atoms
In which of the following pairs of chemical formulas do the two members of the pair
contain the same number of elements as well as the same number of atoms?
D) NH4Br and CaSO4
The total number of atoms present in one formula unit of Fe2(TeO4)3 is
D) 17
The “mathematical meaning” associated with the metric system prefixes centi, milli, and
micro is, respectively,
B) 10–2, 10–3, and 10–6.
In which of the following sequences are the metric system prefixes listed in order of
decreasing size?
C) giga hecto centi
3. To what decimal position should a measurement be recorded if the smallest markings on
the measurement scale are tenths of a meter?
C) to the hundredths of a meter
4. In which one of the following measure numbers are all of the zeros significant?
D) 7.692600
5. In which of the following pairs of numbers does each member of the pair contain the same number of
significant figures?
D) 0.000095 and 950,000
6. In which of the following cases is the given number correctly rounded to three significant figures?
C) 75.05 becomes 75.1
7. Which of the following would involve an exact number?
C) the number of feet in a meter
8. The number 87,079.00 expressed in scientific notation becomes
D) 8.7079x104
9. The number 0.000053 expressed in scientific notation becomes
D) 5.25x10-5
10. The calculator answer obtained from multiplying the measurements 52.36 and 5.55 is
290.60. Given the operational rules governing significant figures this answer
C) should be rounded to 291
11. The correct answer obtained from adding the measurements 7.0, 2.93 and 5.375
contains
B) 3 significant figures
12. The correct answer obtained by dividing the measurement 6.43x10-1 by the
measurement 1.81x105 is
B) 3.55x10-6
14. How many conversion factors can be derived from the equality 1000 years = 1 millenium?
A) two
15. The density of an object is the ratio of its
C) mass to volume.
16. If object A weighs 6.0 grams and has a volume of 3.0 mL and object B weighs 9.0 grams and has a
volume of 2.25 mL,
C) B is twice as dense as A
17. What is the mass, in grams, of 37.5 mL of a liquid if its density is 0.71 g/mL?
B) 27
18. Which of the following comparisons of the size of a degree on the major temperature
scales is correct?
D) A Celsius degree and a Kelvin degree are equal in size.
19. Which of the following would be a correct set of units for specific heat?
C) J/g °C
20. How many joules of heat are required to raise the temperature of a 95.1 g Al bar from
22.8ºC to 51.0ºC? The specific heat of Al is 0.908 J/g ºC.
C) 2435
The correct electron configuration for 17Cl is
C) 1s2 2s2 2p6 3s2 3p5.
Which of the following statements is consistent with the electron configuration 1s2 2s2 2p6 3s2 3p6?
B) there are 6 electrons present in a 2p subshell
After the 4s subshell of an atom is filled with electrons, the next electron added will
enter the
3d subshell
The elements in group IVA of the periodic table all have electron configurations ending in
A) p2.
Which of the following element-classification pairings is incorrect?
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