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CHEM 139 > Quizzes > Flashcards

Quizzes Flashcards

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1
Q

You measure the temperate of solution in the lab and find it is 104.5 Celsius. What is this temperature in Kelvin? Please report your answer to four significant figures, and include units in your answer as “K”. For example, a possible answer would be 25.67 K

Do not write this answer using scientific notation.

A

377.7 K

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2
Q

You measure the temperate of solution in the lab and find it is 22.6 Celsius. What is this temperature in Fahrenheit? Please report your answer to three significant figures, and please include units in your answer as “F”. For example, a possible answer would be 25.67 F

Do not write this answer using scientific notation.

A

72.6 F

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3
Q

I have weighed our 456.7 milligrams (mg) of solid copper. How many grams is this? Please report your answer to the correct significant figures, and please include units in your answer as “g”. For example, a possible answer would be 25.67 g

Do not write your answer using scientific notation.

A

0.4567 g

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4
Q

A student just found a piece of solid sodium that has a mass of 5.2 g. How many micrograms (ug) is this?

A

5.2x10^6 ug

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5
Q

Match the numerical value with the correct number of significant figures

0.000230

A

three significant figures

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6
Q

Match the numerical value with the correct number of significant figures

1.2

A

two significant figures

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7
Q

Match the numerical value with the correct number of significant figures

12000

A

ambiguous

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8
Q

Match the numerical value with the correct number of significant figures

1.560

A

four significant figures

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9
Q

Match the numerical value with the correct number of significant figures

100 cm = 1 m

A

unlimited

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10
Q

Match the numerical value with the correct number of significant figures

1.0000x10^6

A

five significant figures

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11
Q

Solve the problem below, reporting your answer to the correct number of significant figures:

6.2 x 3.115 x 4.22 x 0.655

A

53

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12
Q

Solve the problem below, reporting your answer to the correct number of significant figures:

1239.3 + 12.73 + 3.42 =

A

1255.5

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13
Q

Solve the problem below, reporting your answer to the correct number of significant figures:

5.211 x 3.115 x (3.15 + 0.442)

A

58.3

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14
Q

A nanoparticle is measured and found to have a diameter of 325nm. What is the diameter of this particle in meters (m)?

A

3.25x10^-7

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15
Q

A student got carried away and weighed out 35kg of sodium. How much sodium is that in ug?

A

3.5x10^10

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16
Q

A titanium bicycle frame displaces 0.314 L of water and has a mass of 1.41kg. What is the density of this bicycle in g/cm^3?

A

4.49

17
Q

Convert 9.255 cm^3 to gallons (1 gallon=3.79L)

A

2.442 gallons

18
Q

Na+

A

eleven protons, ten electrons

19
Q

Na

A

eleven protons, eleven neutrons

20
Q

N-15

A

contains one additional neutrons as compared to number of protons

21
Q

Iodine

A

Nonmetal that likes to gain an electron

22
Q

Oxygen

A

nonmetal that likes to gain two electrons

23
Q

Ne-20

A

contains an equal number of protons and neutrons

24
Q

Magnesium has three naturally occurring isotopes with the masses and abundance listed below. What is the atomic mass of magnesium? Please report your answer using four significant figures. Do not include units, and do not write your answer using significant notation. ex. 35.67

Mg-24 Mass=23.9850 amu Abundance=78.99%
Mg-25 Mass=24.9858 amu Abundance=10.00%
Mg-26 Mass=25.9826 amu Abundance=11.01%

A

24.31

25
Q

A sample was found to contain 8.15x10^27 atoms of nickel. What is the mass of this sample in Kg?

Hint, the atomic mass of nickel is 58.69 amu.

Do not write your answer in scientific notation and do not include units. Your answer should contain 4 significant figures ex. 805.3

A

794.3

26
Q

How many atoms are present in 39.7 g of sulfur?

A

7.46x10^23 atoms

27
Q

How many moles are present in a sample that contains 12.89 g of the element Platinum?

A

6.608x10^-2 moles

28
Q

If the total mass of the reactants of a chemical reaction is 8.75g, then the mass of the products of that chemical reaction must be _________.

A

8.75g

29
Q

If an atom of a given element that has an overall neutral charge has 8 protons, it must have 8 electrons.

A

true

30
Q

How many protons do the atoms of the element Thorium (Th) contain?

A

90

31
Q

Calcium (Ca) atoms are most likely to ___________.

A

lose 2 electrons

32
Q

Chlorine (Cl) atoms are most likely to ___________.

A

form anions

CHEM 139 (3 decks)

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