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Chemistry Midterm SP25

Total questions: 42

Worksheet time: 7hrs 0mins

Name
Class
Date
1.

How many different type of atoms are in the following molecule C6H12O6?

a)
3
b)
6
c)
12
d)
24
2.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
3.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
4.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same  number of atoms
c)
Same subscripts
d)
Same coefficients
5.

What percentage of the total atomic mass of carbon monoxide (CO) is composed of carbon?

a)

29%

b)

43%

c)

57%

d)

73%

6.

How many electrons would a neutral atom of boron have?

a)

10.81

b)

5

c)

10

d)

15

7.

Which atom will have a +1 charge?

a)

3 protons

4 neutrons

3 electrons

b)

3 protons

4 neutrons

4 electrons

c)

3 protons

4 neutrons

2 electrons

d)

3 protons

3 neutrons

3 electrons

8.
Which subatomic particles contribute the most to the mass of an atom?
a)
Protons, Neutrons, Electrons
b)
Protons only
c)
Protons and Electrons
d)
Protons and Neutrons
9.

126C\frac{12}{6}C  What is the 12 represent

a)

mass number (n+p)

b)

proton/atomic number

c)

element symbol

d)

number of neutrons

10.

A neutral atom of the isotope 2612Mg would consist of

a)

12 protons, 26 neutrons

b)

26 protons, 12 neutrons

c)

26 protons, 14 neutrons

d)

12 protons, 14 neutrons

11.

What is the mass measurement shown in grams (g)?

a)

413.65 g

b)

413.7 g

c)

410 g

d)

413.650 g

12.

What type of reaction is the following:
BaCl2+2KI −> 2KCl + BaI2BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

13.

What type of reaction is the following:
2KI −> 2K + I22KI\ ->\ 2K\ +\ I_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

14.

What type of reaction is the following:
Zn + 2HCl −> ZnCl2+H2Zn\ +\ 2HCl\ ->\ ZnCl_2+H_2

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

15.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

16.

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula? Instructions: Change the % to g, then convert to moles, divide by smallest value, the ratio becomes the empirical formula.

a)
Mg4N3
b)
MgN2
c)
Mg3N2 
d)
MgN
17.

Molecular Formula = C2F6

Choose the correct empirical formula.

a)

CF

b)

C2F6

c)

C3F

d)

CF3

18.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
19.

Empirical Formula = CF2

Molecular formula mass = 192 g/mol

Molecular Formula = ?

a)

C4F8

b)

C8F4

c)

C3F6

d)

C2F4

20.
How do the following two elements bond together?
Cr3+  O2-         
a)
CrO
b)
Cr3O2
c)
Cr2O3
d)
CrO3
21.
Name the following ionic compound: Cr(NO2)3
a)
chromium nitrite
b)
chromium nitride
c)
chromium III nitride
d)
chromium III nitrite
22.
What atom matches this electron configuration?
1s22s22p63s23p64s23d10
a)
Zinc
b)
Copper
c)
Nickel
d)
Germanium
23.
What is incorrect about this orbital diagram?
a)
Both arrows in the 2p box should be pointing up
b)
There is nothing incorrect with this diagram
c)
In the there should only be 1 orbital in the first 2p box and one in the 2nd 2p box
d)
All the arrows should be pointing up.
24.
This orbital diagram represents:  
a)
C
b)
B
c)
N
d)
O
25.
There are __?__ significant digits in the number 0.00076
a)
2
b)
4
c)
5
d)
6
26.
There are __?__ significant digits in the number 90,000.00
a)
1
b)
2
c)
5
d)
7
27.
Solve & Round to Correct Sig Figs.
4.5 + 4.32 = 
a)
8.8
b)
8.7
c)
8
d)
8.0
28.
Name this compound: N2O4
a)
tetranitrogen dioxide
b)
nitrogen tetraoxygen
c)
dinitrogen tetroxide
d)
nitrogen
29.

Organize these options into properties of ionic compounds or properties of covalent compounds

Categorize the following

Made up a (+) metallic ions and (-) nonmetallic ions after metal transferred e- to nonmetal

Arranged in regular repeating patterns and crystals

High melting and boiling points

Can conduct electricity when dissolved in water

Made up of nonmetals sharing e-

Molecules that can be solid, liquid, or gas

Low melting and boiling point

Cannot conduct electricity when dissolved in water

Properties of Ionic Compounds
Properties of Covalent Compounds
30.

Group 18 elements are called

a)

Alkali metals

b)

Alkaline Earth metals

c)

Halogens

d)

Noble gases

e)

Transition metals

31.

Which group has 1 valence electron (ve-)?

a)

Alkali metals

b)

Alkaline Earth metals

c)

Halogens

d)

Noble gases

e)

Transition, Lanthanide, and Actinide metals

32.

What is another name for the elements in group 7?

a)

The Halogens

b)

The Oxides

c)

The Noble Gases

d)

The Alkali Metals

33.

What holds the atoms together in a covalent bond?

a)

The attractions between the protons and neutrons.

b)

Attractions between the shared protons.

c)

Attractions between the shared electrons and protons.

d)

Ionic valence electron transfer.

34.

What is the net charge of an ionic compound?

a)

Four

b)

Zero

c)

One

d)

Eight

35.
Anything that has mass and takes up space.
a)
volume
b)
matter
c)
solid
d)
temperature
36.
This part of the experiment serves as a basis of comparison; the one variable being tested has been omitted. 
a)
experimental group
b)
control group
c)
data
d)
variables
37.
This variable in an experiment is the one being deliberately changed by the scientist. 
a)
dependent variable
b)
independent variable
c)
data
d)
control group
38.
Tim notices there are less frogs in the creek this year and thinks pesticide is to blame.
He gathers 20 healthy frog eggs from a nearby lake.
He puts 10 eggs in a mason jar with 500mL of clean water.
He puts the other 10 eggs in a mason jar with 490 mL of clean water and 10 mL of pesticide.
Which is the CONTROL GROUP?
a)
The eggs in clean water
b)
The added pesticide
c)
The mason jars
39.
What is the molar mass of table salt (NaCl)?
a)
116.886 g/mol
b)
35.453 g/mol
c)
22.990 g/mol
d)
58.443 g/mol
40.

How many grams are in 2 moles of carbon (C)?

a)

12.0 grams

b)

24.0 grams

c)

36.0 grams

d)

48.0 grams

41.

How many moles of copper (II) chlorate contain 1.45x1021 molecules?

a)

8.73x1044

b)

1.20x1024

c)

0.00241

d)

1.45

42.

How many moles of sodium chloride are in a 321.8 g sample?

a)

18810 moles

b)

3.315 x 1024 moles

c)

5.507 moles

d)

4.767 moles

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