Question

If W, X, Y, and Z are pure substances which could either be elements or compounds, consider the following chemical equation and identify which statements are true:

W ------> X + Y + Z

Choose all that apply.

a) X is an element

b) X is a compound

c) X can not be classified due to lack of information

d) Y is an element

e) Y is a compound

f) Y can not be classified due to lack of information

19

How many mg (milligrams) are in 0.062 g?

Place your answer in the box. Express your answer using only a number or numbers without text. Report your result in decimal notation and to the proper number of significant figures. Use the following format to express a number smaller than one in decimal notation: 0.0771 (or -0.0771 if the number is negative). Note that there are no spaces within the expression. All numbers are measured.

20

Which of the following ions violates the octet rule?

a) B3+

b) Mg2+

c) Al3+

d) O-

e) Na+

21

Which of the following elements is incorrectly classified?

a) potassium --- alkali metal

b) manganese --- alkaline earth metal

c) germanium --- metalloid

d) vanadium --- transition metal

e) chlorine --- halogen

22

The density of a liquid is 1.19 g/mL. What is the volume, in mL, of 3.65 g of this liquid?

a) 3.07

b) 4.34

c) 0.326

d) no correct response

23

How many valence electrons does an atom with the following electron configuration have?

Place your answer in the box. Express your answer using only a number without text.

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6

24

Following the Aufbau principle, which element has distinguishing electrons 5p3?

Place your answer in the box. Do not spell out the name of the element. Express your answer using only the proper elemental symbol.

25

In the formation of an ion, what is the expected behavior of an atom with the following electron configuration:

1s22s22p63s23p4

a) gain 2 electrons

b) lose 2 electrons

c) gain 4 electrons

d) lose 4 electrons

e) no correct response

26

What is the ionic charge of the metal cation in the following compound?

Pb(SO4)2

a) 1+

b) 2+

c) 2-

d) 3+

e) 4+

27

Perform the following calculation (all numbers are measured).

0.9 + 8.9 + 0.81 =

a) 10

b) 11

c) 10.6

d) 10.61

e) 10.610

28

Indicate whether the following statement is true or false.

If an electron configuration ends with 4s2, the atom must have a total of 2 electrons.

a) true

b) false

29

What is the maximum number of electrons that can occupy the 4p subshell?

Place your answer in the box. Express your answer using only a number without text.

30

Which of the following measured numbers is expressed with 5 significant figures?

Choose all that apply.

a) 0.011300

b) 30,030

c) 0.3135

d) 2.3012 x 10-7

e) 2.30510 x 104

31

Name the following species according to IUPAC naming rules:

ZnBr2

Place your answer in the box. Write the name using lower case letters only. For variable metals, place the Roman numeral inside parentheses. Note that the Roman numeral is expressed with capital letters. Do not use any hyphens, number or numbers without text. Note that there is no space between the cation name and a parenthesis. However, there is a space between the cation and the anion names.

For example, the you should write the name for Fe2O3 as iron(III) oxide.

32

A substance has been isolated in the laboratory. Based on the two characteristics below, how can the substance be classified?

I. The substance can be separated by physical means.

II. Two phases are present.

a) The substance is an element.

b) The substance is a compound.

c) The substance is a homogenous mixture.

d) The substance is a heterogeneous mixture.

e) no correct response

33

What is the correct chemical formula for a compound named tin(II) nitrate?

a) Sn2NO3

b) Sn3(NO3)2

c) Sn(NO3)2

d) Sn2(NO3)3

e) SnNO2

34

Carry-out the following mathematical operation and report your answer to the proper number of significant figures.

(8.00 x 0.70) + (11.0 x 0.06) =

Place your answer in the box using decimal notation.

35

Which of the following statements is true?

Choose all that apply.

a) Chemistry is a scientific discipline that studies the geographical distribution of plants.

b) Chemistry is a scientific discipline that studies the composition of matter.

c) Chemistry is a scientific discipline that studies the transformations of matter.

d) Chemistry is a scientific discipline that studies microorganisms and fungi.

e) a through d are all true statements

f) no correct response; a through d are all false statements

36

Which of the following atoms has the most valence electrons?

a) Na

b) Mg

c) In

d) Te

e) Si

37

In an ionic compound made up of aluminum and nitrogen, how many aluminum ions are present?

Place your answer in the box. Express your answer using a number or numbers without text.

38

Which of the following phrases matches the proton?

a) has no charge

b) has a negative charge

c) is about 1800 more massive than an electron

d) was discovered by James Chadwick

e) more than one correct response

f) no correct response