Exam 1

Navigation » List of Schools » Los Angeles Harbor College » Chemistry » Chem 065 – Introductory General Chemistry » Winter 2024 » Exam 1

Need help with your exam preparation?

Existing Quiz Clients Login here

Below are the questions for the exam with the choices of answers:

Try The Exam

Question #1

Naturally occurring neon (Ne) has three isotopes with the following data
neon-20, 90.92% (19.99 amu)
neon-21, 0.257% (20.99 amu)
neon-22, 8.82% (? amu)
The atomic mass for Ne is 20.183 amu. What is the mass in amu for neon-22? Report 2 decimal places in your final answer. No need to include unit.

A 2.216

B 21.16

C 22.16

D 22

Question #2

Which of the following is an example of a heterogenous mixture?

A Saline

B Coffee and milk

C Air

D Sand mixed with oil

Question #3

The state of matter that has a definite volume but no definite shape is

A Liquid

B Liquid and Gas

C Gas

D Solid

Question #4

Which of the following substances will float in ethanol?

A glass

B ice

C gold

D charcoal

Question #5

Which of the following is a physical change?

A A nail rusts

B A potato rots

C A pierce of sulfur is burned

D Steam condenses

Question #6

A mixture can be distinguished from a pure compound by its

A Lack of color

B Liquid State

C Heterogeneous nature

D Variable composition

Question #7

307 degree F is equivalent to _________ degree C.

A 150

B 510

C 351

D 300

E 153

Question #8

Which of the following gives the correct numbers of protons, neutrons, and electrons in a neutral atom of 118 50 Sn

A 118 protons, 50 neutrons, 118 electrons

B 68 protons, 68 neutrons, 50 electrons

C 50 protons, 68 neutrons, 50 electrons

D 50 protons, 50 neutrons, 50 electrons

E 118 protons, 118 neutrons, 50 electrons

Question #9

Which of the following is NOT true for the atoms 13N, 14N, and 15N?

A They all have the same atomic number.

B They all have 7 protons.

C They all have the same mass number.

D They are isotopes.

E They all have 7 electrons.

Question #10

A sample of silicon has three naturally occurring isotopes: Si-28 (mass 28.0 amu); Si-29 (mass 29.0 amu) and Si-30 (mass = 30.0 amu). Which isotope is the most abundant?

A Si-30

B Si-29

C All isotopes have the same natural abundance.

D Si-28

Question #11

What is the mass number of an atom of potassium that has 20 neutrons?

A 39

B 35

C 15

D 59

E 19

Question #12

What is the symbol of the Alkaline earth metals group and Period 3?

A Si

B Na

C Mg

D Al

E C

Question #13

Select the correct symbol for the element. Potassium

A P

B K

C Po

D Pt

E Ko

Question #14

Name the element that has average atomic mass closest to 12.

A Iron

B Oxygen

C Carbon

D Helium

Question #15

Fill in the blank with a “+” or “-” sign and a number. (example: +5 or -4). What is the charge of an ion that contains 50 protons and 46 electrons?

A -4

B -6

C +4

D +6

Question #16

Choose all that apply: which of the following element(s) is/are a transition metal(s)?

A Na, I

B Na,Ag

C Co, Ag

D I, Co

Question #17

Which of the following numbers has 3 significant figures? Mark all that apply.

A 2 dozen

B 9.11 x 10-31 kg 740 mph 1.60 x 10-19 C

Question #18

Written in scientific notation, 0.000 000 33 is

A 3.3 × 108.

B 3.3.

C 3.3 × 107.

D 3.3 × 10-7.

E 3.3 × 10-8.

Question #19

Convert the number 3.060 x 10-3 to decimal notation.

A 0.003060

B 0.00306

C 0.000306

D 0.0003060

Question #20

What is the volume (in mL) of 1.50 gram of titanium? Give the answer in decimal notation to the correct number of significant figures. Do NOT include unit.

A 333

B 0.333

C 33.3

D 33.3

Question #21

Round the number 36.01 to 2 significant figures. Give the answer in decimal notation (not scientific).

A 36

B 0.3601

C 3.601

D 36.2

Question #22

One human heartbeat requires about 1.0 joule of energy. How many kilojoules of energy would be consumed by the heart during 9.9 hours of sleep at a heart rate of 60. beats per minute? (Be careful with sig figs!). NO need to include unit in your answer.

A 3.6

B 0.36

C 360

D 36

Question #23

A student sets out to determine the density of a metal sample just like you did in experiment 2. To measure the volume, he immersed his sample in a graduated cylinder containing water and measured the volume of the displaced liquid. If after placing his metal sample in water some bubbles were formed in the graduated cylinder, how would his calculated density compare to the true density of his sample? Choose from higher, lower, no change, can’t tell.

A higher

B no change

C can’t tell

D Lower

Question #24

Find the average of the three trials: 7.674 mL, 7.672 mL, 7.672 mL. NO need to include unit in your answer.

A 7.772

B 7.683

C 7.673

D 7.679

Question #25

State whether the following is an extensive or intensive property:
Odor

A Intensive

B Extensive

Question #26

State whether the following is an extensive or intensive property:
Weight

A Intensive

B Extensive

Question #27

Give the answer to the following calculation using the correct number of sig figs. (2.53 x 6.87) ÷ (5.9 + 6) = ?

A 1.46

B 1

C 1.46

D 1.5

E 1.4

Question #28

How many significant figures are in each of the following numbers?
0.04350680

A 7

B 6

C 5

D 8

Question #29

How many significant figures are in each of the following numbers?
47 grams

A 2

B 4

C 0

D 1

Question #30

Doing experiments to test your hypothesis is part of the scientific method.

A FALSE

B TRUE

Question #31

Specific Heat is a sort of resistance to temperature change: the larger a substance’s Specific Heat, the more energy it takes to make the the substance’s temperature change.

A FALSE

B TRUE

Question #32

A substance’s boiling point is an example of a chemical property.

A TRUE

B FALSE

Question #33

In the number 123.4, which digit is not significant?

A 3

B all are significant

C 1

D 4

E 2

Question #34

You notice that there is more traffic between 8 and 9 in the morning. This would be a(n)

A all of these

B experiment.

C theory.

D hypothesis.

E observation

Question #35

In this list, which substance can be classified as a type of matter?

A heat

B sleep

C temperature

D cold

E salt

Try The Exam

Fresh Grad Lands Job as Real Estate Agent With Help from Professional Writers

Need help with your exam preparation?

Below are the questions for the exam with the choices of answers:

Christian S.

Tyra

Linda

Manush

We accept payment