Year 11 Chemistry Question Paper
Chemistry 161
Sample Quiz Chapters 1&2 KEY
Harold
Note: You have already received a significant figures/scientific notation sample quiz. The first ten problems (20 points) will be of exactly the same type. The numbers will be changed to offend the guilty (those who did not use the sample test as a study guide).
1. The term that refers to the reproducibility of a laboratory measurement is
a. precision. b. repeatability. c. accuracy. d. exactness. e. the number of S.F.
2. The distance between atoms is sometimes given in picometers where 1 pm is equivalent to 1 x 10-12
m. If the distance between the layers of carbon atoms in graphite is 3.35 x 10-8 cm, what is this distance in picometers?
a. 0.335
b. 3.35
c. 335 d. 3,350 e. …show more content…
2.90 mL
10. The following species, 17Cl-, 18Ar, and 19K+, all have the same number of
Chemistry 161
a. protons.
Sample Quiz Chapters 1&2 KEY
b. electrons.
c. neutrons.
Harold
d. isotopes.
11. How many protons, neutrons, and electrons are in one atom of
e. nucleons.
119
50 p 69 n 50 e-
50Sn?
S2-
12. What is the symbol of the species that has 16 protons and 18 electrons?
13. An atom that has the same number of neutrons as
58
a. 59Ni.
b. 57Co.
c. 60Cu. d.
Fe.
59
Co is
e.
58
Ni.
59
Co has 59-27 = 32 n
14. A certain element is listed as having 72.6 atomic mass units. It is probably true that it contains
a. a mixture of isomers.
b. a mixture of allotropes.
c. a mixture of isotopes.
d. a mixture of enantiomers.
e. an impurity.
Since the mass is not a whole number then the total is likely composed of several isotopes with varying mass numbers.
15. How many neutrons are there in 15 molecules of 3717Cl2 ?
2 37Cl in each molecule x (37 17) neutrons per 37Cl x 15 molecules Cl2 = 2 x 20 x 15 neutrons = 600 neutrons
16. What is the ratio of oxygen atoms to hydrogen atoms in the mineral carnotite, which has …show more content…
We have no way of knowing what the two products are.
19. The formula for europium carbonate is Eu2(CO3)3. On the basis of this information, the formula for the chlorate of europium would be expected to be?
a. EuCl2. b. EuCl3.
c. Eu2(ClO3)3.
d. Eu(ClO4)2.
e. Eu(ClO3)3.
CO3 has a 2- charge, therefore the Eu must have a 3+ charge. Since the chlorate ion is 1-, we have a 1-3 ratio.
20. The elements in a row of the periodic table are known as
b. a group. c. metals. d. metalloids.
a. a family.
e. a period.
21. Which one of the following is true concerning the simplest unit of MgCl2(s)?
a. 1 Mg atom and 1 Cl2 molecule
b. 1 MgCl2 molecule
c. 1 Mg atom and 2 chlorine atoms
d. 1 positive ion and 2 negative ions
e. 1 positive and 1 negative ion
#21 This is an ionic compound, therefore it is composed of ions. It is not referred to as a molecule and while it is composed of atoms theses atoms are in fact ions, so d. is the best answer.
Chemistry 161
Sample Quiz Chapters 1&2 KEY
22. Give the correct formula for the following ions:
a. phosphate ion
b. chlorate ion
c. nitrite ion
3-
PO4
-
Harold
d. phosphide ion
-
ClO3
Sample Quiz Chapters 1&2 KEY
Harold
Note: You have already received a significant figures/scientific notation sample quiz. The first ten problems (20 points) will be of exactly the same type. The numbers will be changed to offend the guilty (those who did not use the sample test as a study guide).
1. The term that refers to the reproducibility of a laboratory measurement is
a. precision. b. repeatability. c. accuracy. d. exactness. e. the number of S.F.
2. The distance between atoms is sometimes given in picometers where 1 pm is equivalent to 1 x 10-12
m. If the distance between the layers of carbon atoms in graphite is 3.35 x 10-8 cm, what is this distance in picometers?
a. 0.335
b. 3.35
c. 335 d. 3,350 e. …show more content…
2.90 mL
10. The following species, 17Cl-, 18Ar, and 19K+, all have the same number of
Chemistry 161
a. protons.
Sample Quiz Chapters 1&2 KEY
b. electrons.
c. neutrons.
Harold
d. isotopes.
11. How many protons, neutrons, and electrons are in one atom of
e. nucleons.
119
50 p 69 n 50 e-
50Sn?
S2-
12. What is the symbol of the species that has 16 protons and 18 electrons?
13. An atom that has the same number of neutrons as
58
a. 59Ni.
b. 57Co.
c. 60Cu. d.
Fe.
59
Co is
e.
58
Ni.
59
Co has 59-27 = 32 n
14. A certain element is listed as having 72.6 atomic mass units. It is probably true that it contains
a. a mixture of isomers.
b. a mixture of allotropes.
c. a mixture of isotopes.
d. a mixture of enantiomers.
e. an impurity.
Since the mass is not a whole number then the total is likely composed of several isotopes with varying mass numbers.
15. How many neutrons are there in 15 molecules of 3717Cl2 ?
2 37Cl in each molecule x (37 17) neutrons per 37Cl x 15 molecules Cl2 = 2 x 20 x 15 neutrons = 600 neutrons
16. What is the ratio of oxygen atoms to hydrogen atoms in the mineral carnotite, which has …show more content…
We have no way of knowing what the two products are.
19. The formula for europium carbonate is Eu2(CO3)3. On the basis of this information, the formula for the chlorate of europium would be expected to be?
a. EuCl2. b. EuCl3.
c. Eu2(ClO3)3.
d. Eu(ClO4)2.
e. Eu(ClO3)3.
CO3 has a 2- charge, therefore the Eu must have a 3+ charge. Since the chlorate ion is 1-, we have a 1-3 ratio.
20. The elements in a row of the periodic table are known as
b. a group. c. metals. d. metalloids.
a. a family.
e. a period.
21. Which one of the following is true concerning the simplest unit of MgCl2(s)?
a. 1 Mg atom and 1 Cl2 molecule
b. 1 MgCl2 molecule
c. 1 Mg atom and 2 chlorine atoms
d. 1 positive ion and 2 negative ions
e. 1 positive and 1 negative ion
#21 This is an ionic compound, therefore it is composed of ions. It is not referred to as a molecule and while it is composed of atoms theses atoms are in fact ions, so d. is the best answer.
Chemistry 161
Sample Quiz Chapters 1&2 KEY
22. Give the correct formula for the following ions:
a. phosphate ion
b. chlorate ion
c. nitrite ion
3-
PO4
-
Harold
d. phosphide ion
-
ClO3