Finals exam

Question 1

What is the following states of matter for Figure #1

A. Soild

B. Liquid

C. Gas

Answer 1

Gas

Question 2

Which of the following states of matter for figure #2

A. Soild

B. Liquid

C. Gas

Answer 2

Soild

Question 3

Figure #3 would be best described as

A. a liquid company
b. a gaseous mixture
c. a gaseous compound
d. a liquid mixture
e. a gaseous element

Answer 3

A gaseous compound

Question 4

Which one of the following would be a chemical property of a sample of neon gas?
a. It is a gas at room temperature
b. it is inert
c. it is colorless
d. it boils at -246 degrees Celsius

Answer 4

it is inert

Question 5

Which one of the following would be a physical property of glucose?
A. it is used by the body to generate energy
b. when combined with sulfuric acid it forms carbon
c. In its pure form, its s a white powder
d. it can be fermented to for ethanol

Answer 5

In its pure form, its s a white powder

Question 6

Which of the following describes a chemical change involving water Figure #3

Answer 6

c

Question 7

Which of the following is a chemical change?

A. cooking an egg
b. mixing oil and water
c. tearing a piece of paper
d. watching a dvd

Answer 7

cooking an egg

Question 8

Which of the following is a physical change?

A. an alkaline battery is a discharged
B. A lithium,-ion battery is recharged
C. water is boiled in a microwave
D. A car battery is jumping started
E. a pinch of salt is dissolved in water

Answer 8

water is boiled in a microwave

Question 9

Which of the following is a physical change?

A. rusting of a nail
B.tearing of a piece of paper
C.cooking an egg
D. Burning wood

Answer 9

tearing of a piece of paper

Question 10

If the density of a piece of aluminum metal is 2.70 g/cm³, will the item float or sink in pure water?

Answer 10

Sink

Question 11

A chemist is trying to identify an unknown metal, and finds that 25.0 cm³ of the substance has a mass of 224.43 g at 20 °C. Which of the following metals is it? Figure #4

Answer 11

8.98

Question 12

Which will have a higher density: 1.00 g of pure gold or 1.00 kg of pure gold?

A. 1.0 g of pure gold
B. 1.0 kg of pure gold
C. Both will have the same density
C. There’s no way to determine

Answer 12

They both will have the same density

Question 13

A chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume change is 6.1 mL. If the metal weighs 8.1 g, what is the density of the metal in g/mL?

Answer 13

1.32

Question 14

Density of a substance is its mass per unit volume. If the volume of the object decreases, what must happen to the mass in order for the density to stay the same?
A. mass must increase
B. Mass must decrease
C. Mass remains the same

Answer 14

Mass must decrease

Question 15

Convert 15.0 kilometers to centimeters. figure #5

Answer 15

1.5 x 10^6

Question 16

Convert 15.0 milligrams to kilograms. figure #6

Answer 16

1.5 x 10 ^-5

Question 17

The diameter of a milliner’s needle is 0.552 mm. What is this diameter in µm? figure #7

Answer 17

552

Question 18

Which particle(s) may be found in the nucleus of an atom?
A. protons only
B. neutrons only
C. Nutrons and electrons
D. Protons and Neutrons
D. Electrons and Neutrons

Answer 18

Proton and neutron

Question 19

How many protons are in an atom of strontium-90? Mass Number

A. 38
B. 2
C. 87.62
D. 90

Answer 19

38

Question 20

How many electrons are in a neutral carbon-14 atom?

A. 2
B. 4
C. 6

Answer 20

6

Question 21

How many neutrons are in an atom of uranium-235?

Note* atom #-mass#

Answer 21

143

Question 22

What does the mass number of an atom represent?

Answer 22

he total number of protons and neutrons in the atoms

Question 23

How many protons are in an atom of Co?

Answer 23

27

Question 24

Which of the following pairs represent isotopes?
Figure #8

Answer 24

c

Question 25

Neutral atoms of all isotopes of a given element have the same A. mass number B. Masses C. number electrons D. Number of neutrons E. Number of protons and neutrons

Answer 25

Number of electrons

Question 26

Determine the number of protons (p) and electrons (e) in Mg²⁺. A. 10 p, 12 e B. 12 p, 12 e c. 12p, 10e D.12p, 14e E. 10p, 10e

Answer 26

12p, 10e

Question 27

Atoms from which of the following pairs are most likely to form an ionic bond? (Remember, a pair of metallic and nonmetallic atoms usually forms an ionic bond.) A. Na and K B.N and F c. Ti and O

Answer 27

Ti and o

Question 28

A molar mass value is equivalent to any element's..... A. Weight B. Density C. temperature D. Boiling point

Answer 28

Weight

Question 29

Determine the mass in grams of 3.00 × 10²¹ atoms of arsenic. (The mass of one mole of arsenic is 74.92 g.) Figure #9

Answer 29

0.373

Question 30

what is Avogadro's number

Answer 30

6.022 x 10^23

Question 31

Determine the number of atoms in 51.0 grams of sodium, Na. (The mass of one mole of sodium is 22.99 g.) figure #10

Answer 31

1.34 x 10^24