CHE100 FINAL NAME 1. How many oxygen atoms are present in one A) 6.022 x 103 oxygen atoms B) 2.401 x 10 oxygen atoms C) 1.506 x 102) oxygen atoms D) 4.015 x 10 oxygen atoms mole of N 0s molecules? 2. Which is NOT a physical property of water? A) The boiling point of water is 100c B) Water is colorless. C) Water reacts with sodium metal to produce sodium bydroxide and hydrogen D) The density of water at 4.0\'C is 1.00g/ml 3. Which one of the following matters is a compound? A) copper B) brass C) aluminum oxide D) an eraser 4. How many significant figures should be included in the answer to the following calculation? 186.0+ 0,840 x 10.120 A) 5 5. 4.00 x 10 of a metal absorbs 1.00 x 104 c) 3 D) 2 J of heat energy and its temperature rises from 20.0 C to 8 What is the specific heat of the metal? A) 0.260 J/g, C B) 0.205 J/g C C) 03851/g C D) 0.443 Jg\'c 6. Which is the correct unit in the answer to the following calculation? (8,10 g/em\') x (2.00 cm x 2.00cm x 1.5 cm)- 48.6 A) cm2 B) g/cm C) em D) 8 7. The correct formula for potassium sulfate is B) KSO4 D) KaSO A) KS Convert 2.00 em2 to in2. (1 in 2.54 cm) B) 12.9 in2 8. C) 5.08 in D) 0.787 in A) 0.310 in 9. A 48.0g piece of metal is dropped into a graduated cylinder containing 50.0ml. of water. The wat rises to 56.4mL. What is the density of the metal? C) 3.87 g/ml D) 7.5 g/mil B) 0.769 gmlL A) 1.33 g/mL A) Hydrocarbonic acid An ion contains 16 protons, 18 electrons, and has mass number 32. What is the symbol of this i B) Hydrogen carbonic acid D) Dihydrogen carbonic acid . What is the chemical name for HaCOs (aq)? C) Carbonic acid D) A B) S2 ) Ar D) KOH hich of the following compounds is a strong electrolyte when dissolved in water? C) Clh glacial HC2H:O2 B) CoHi20 Page 2 of 5
Solution
1.
1 mol of N 2 O 4 has 4 * 6.022 * 10 23 = 2.401 * 10 24 oxygen atoms
(B)
2.
(C) Because there is a change in composition.
3.
(C) Al 2 O 3 The combination of two or more atoms of different elements.
4.
The answer is 194.5
(B) 4
5.
Heat change = mass * specific heat * change in temeprature
6.
(D) g.
1/cm 3 and cm * cm * cm get cancelled
7.
(D) K 2 SO 4 because K ahs + 1 charge and SO 4 has - 2 charge
8.
1 cm = 1 / 2.54 in.
1 cm 2 = ( 1 / 2.54 ) 2 in 2
Then, 2.00 cm 2 = 2 * ( 1 / 2.54) 2 in 2
= 0.310 in 2
(A)
9.
density = mass / volume
d = 48.0 / ( 56.4 - 50.0 )
d = 7.50 g / mL
(D)
10.
(C) Carbonic acid
11.
32 16 S 2-
(B)
12.
(D) KOH
.
CHE100 FINAL NAME 1- How many oxygen atoms are present in one A) 6-022.docx
1. CHE100 FINAL NAME 1. How many oxygen atoms are present in one A) 6.022 x 103 oxygen
atoms B) 2.401 x 10 oxygen atoms C) 1.506 x 102) oxygen atoms D) 4.015 x 10 oxygen atoms
mole of N 0s molecules? 2. Which is NOT a physical property of water? A) The boiling point of
water is 100c B) Water is colorless. C) Water reacts with sodium metal to produce sodium
bydroxide and hydrogen D) The density of water at 4.0'C is 1.00g/ml 3. Which one of the
following matters is a compound? A) copper B) brass C) aluminum oxide D) an eraser 4. How
many significant figures should be included in the answer to the following calculation? 186.0+
0,840 x 10.120 A) 5 5. 4.00 x 10 of a metal absorbs 1.00 x 104 c) 3 D) 2 J of heat energy and its
temperature rises from 20.0 C to 8 What is the specific heat of the metal? A) 0.260 J/g, C B)
0.205 J/g C C) 03851/g C D) 0.443 Jg'c 6. Which is the correct unit in the answer to the
following calculation? (8,10 g/em') x (2.00 cm x 2.00cm x 1.5 cm)- 48.6 A) cm2 B) g/cm C) em
D) 8 7. The correct formula for potassium sulfate is B) KSO4 D) KaSO A) KS Convert 2.00 em2
to in2. (1 in 2.54 cm) B) 12.9 in2 8. C) 5.08 in D) 0.787 in A) 0.310 in 9. A 48.0g piece of metal
is dropped into a graduated cylinder containing 50.0ml. of water. The wat rises to 56.4mL. What
is the density of the metal? C) 3.87 g/ml D) 7.5 g/mil B) 0.769 gmlL A) 1.33 g/mL A)
Hydrocarbonic acid An ion contains 16 protons, 18 electrons, and has mass number 32. What is
the symbol of this i B) Hydrogen carbonic acid D) Dihydrogen carbonic acid . What is the
chemical name for HaCOs (aq)? C) Carbonic acid D) A B) S2 ) Ar D) KOH hich of the
following compounds is a strong electrolyte when dissolved in water? C) Clh glacial HC2H:O2
B) CoHi20 Page 2 of 5
Solution
1.
1 mol of N 2 O 4 has 4 * 6.022 * 10 23
= 2.401 * 10 24
oxygen atoms
(B)
2.
(C) Because there is a change in composition.
3.
(C) Al 2 O 3 The combination of two or more atoms of different elements.
2. 4.
The answer is 194.5
(B) 4
5.
Heat change = mass * specific heat * change in temeprature
6.
(D) g.
1/cm 3
and cm * cm * cm get cancelled
7.
(D) K 2 SO 4 because K ahs + 1 charge and SO 4 has - 2 charge
8.
1 cm = 1 / 2.54 in.
1 cm 2
= ( 1 / 2.54 ) 2
in 2
Then, 2.00 cm 2
= 2 * ( 1 / 2.54) 2
in 2
= 0.310 in 2
(A)
9.
density = mass / volume
d = 48.0 / ( 56.4 - 50.0 )
d = 7.50 g / mL
(D)
10.
(C) Carbonic acid
