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Chemistry 120 > Finals exam > Flashcards

Finals exam Flashcards

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1
Q

What is the following states of matter for Figure #1

A. Soild

B. Liquid

C. Gas

A

Gas

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2
Q

Which of the following states of matter for figure #2

A. Soild

B. Liquid

C. Gas

A

Soild

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3
Q

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

A

A gaseous compound

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4
Q

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

A

it is inert

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5
Q

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

A

In its pure form, its s a white powder

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6
Q

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

A

c

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7
Q

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

A

cooking an egg

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8
Q

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

A

water is boiled in a microwave

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9
Q

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

A

tearing of a piece of paper

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10
Q

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

A

Sink

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11
Q

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

A

8.98

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12
Q

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

A

They both will have the same density

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13
Q

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?

A

1.32

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14
Q

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

A

Mass must decrease

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15
Q

Convert 15.0 kilometers to centimeters. figure #5

A

1.5 x 10^6

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16
Q

Convert 15.0 milligrams to kilograms. figure #6

A

1.5 x 10 ^-5

17
Q

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

A

552

18
Q

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

A

Proton and neutron

19
Q

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

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

A

38

20
Q

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

A. 2
B. 4
C. 6

A

6

21
Q

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

Note* atom #-mass#

A

143

22
Q

What does the mass number of an atom represent?

A

he total number of protons and neutrons in the atoms

23
Q

How many protons are in an atom of Co?

A

27

24
Q

Which of the following pairs represent isotopes?
Figure #8

A

c

25
Q

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

A

Number of electrons

26
Q

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

A

12p, 10e

27
Q

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

A

Ti and o

28
Q

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

A

Weight

29
Q

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

A

0.373

30
Q

what is Avogadro’s number

A

6.022 x 10^23

31
Q

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

A

1.34 x 10^24

32
Q
A
33
Q
A

Chemistry 120 (1 decks)

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