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Chem103 > Module 1 > Flashcards

Module 1 Flashcards

1
Q

Convert 845.3 to exponential form and explain your answer

A

Because it is larger than 1, move the decimal 2 places = 8.453 x 10^2

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2
Q

Convert 3.21 x 10^-5 to ordinary form and explain

A

It would be 0.0000321, and because its -5, you move the decimal 5 spaces to the left.

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3
Q

24.6 grams to ? kg

A

24.6g x 1 kg / 1000 g = 0.0246 kg

Since 1kg is 1000 g, you’d move the decimal 3 spaces to the left of do the calculations.

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4
Q

6.3 ft = ? inches

A

Since every 1ft is 12in, you can do 6.3ft x 12 in / 1 ft = 75.6 inches

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5
Q

28C = ? K

A

28 + 273 = 301 K

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6
Q

158 F = ? C

A

158 -32 / 1.8 = 70C

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7
Q

343 K = ? F

A

343 - 273 = 70C
70C x 1.8 + 32 = 158 F

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8
Q

Show the calculation of the mass of 18.6 ml sample of freon with a density of 1.49 g/ml?

A

M = D x V = 1.49 x 18.6 = 27.7g

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9
Q

Show the calculation of the density of crude oil if 26.3 g occupies 30.5 ml.

A

D = M / V = 26.3 / 30.5 = 0.862 g/ml

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10
Q

3.0600 contains how many significant figures

A

5

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11
Q

0.0151 contains how many significant figures?

A

3

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12
Q

3.0600 / 0.0151 = ? (give answer to correct number of significant figures

A

3.0600 / 0.0151 = 202.649 = 203 so 3 significant figures

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13
Q

Classify each of the following as an element, compond, solution, or heterogenous mixture and explain your answer?

  1. Coca Cola
  2. Calcium
  3. Chili
A
  1. Coca Cola - Solution because it is not on the period table (element), and not an element name (compound), and evenly mixed so you can’t tell the ingredients apart (solution)
  2. Calcium - It is an element because you can find it on the periodic table
  3. Chili - Not an element, not a compound, and it appears to be a mixture, which indicates a hetero mix.
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14
Q

Classify each of the following as a chemical change or physical change?

  1. Charcoal Buns
  2. Mixing cake batter with water
  3. Baking the batter to a cake
A
  1. Chemical
  2. Physical
  3. Chemical
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15
Q

Show the full Nuclear symbol including any + or - charge (n), the atomic number (y), the mass number (x) and the correct element symbol (Z) for each element for which the protons, neutrons and electrons are shown - symbol should appear as follows: Zx+/- ny

A

31 protons = Ga31, 39 neutrons = ^70 Ga 31, 28 electrons = 31 - 28 = 3, which then equals ^70 Ga 31 ^+3

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16
Q

Name each of the following chemical compounds. Be sure to name all acids as acids (NOT for instance as binary compounds)

  1. PF
  2. Al2(CO3)3
  3. H2CrO4
A
  1. Binary and phosphorus pentafluoride
  2. Nonbinary and aluminmum carbonate
  3. Nonbinary and Chromic Acid
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17
Q

Write the formula for each of the following chemical compounds explaining the answer with appropriate charges and/or prefixes and/or suffixes.

  1. Carbon monoxide
  2. Manganese (IV) acetate
  3. Phosphorous acid
A
  1. Carbon Monoxide - ide = binary, mono = 1 0 = CO
  2. Manganese (IV) acetate - Mn^+4, C2H302^-1 = Mn(C2H3O4)4
  3. Phosphorus acid - nonbinary acid of H + phosphite (PO3^-3) = H3PO3
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18
Q

Melting ice to liquid water requires heat to be added, so process is

A

endothermic.

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19
Q

Cooling liquid water from 25° to 20° requires heat to be extracted, so the process is

A

exothermic

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20
Q

Determine the number of protons, electrons, and neutrons for the following: ^238 U 92

A

P: 92 E: 92 N: 146

21
Q

Determine the number of protons, electrons, and neutrons for the following: ^35 Cl 17 ^-1

A

P: 17 E: 18 N: 18

22
Q

For the following particles, write the symbol and charge:

A particle with 78 protons, 78 electrons and 117 neutrons:

A

^195 PT 78

23
Q

What is the name of this polyatomic ion: CO₃²⁻

A

Carbonate

24
Q

What is the name of this polyatomic ion: NH₄⁺

A

Ammonium

25
Q

What is the name of the polyatomic ion Acetate

A

C₂H₃O₂

26
Q

What is the name: NH4+

A

Ammonium

27
Q

What is SO4 2-

A

Sulfate

28
Q

What is SO3 2-

A

Sulfite

29
Q

What is NO3-

A

Nitrate

30
Q

What is the equation for Phosphate including charge

A

PO4 3-

31
Q

What is formula for Carbonate:

A

CO₃²⁻

32
Q

What is the formula for Hydroxide

A

OH¯

33
Q

What is the formula for Nitrate?

A

NO3-

34
Q

What is the formula for nitrite

A

NO2-

35
Q

340 ft = ? mi

A

340 ft x 1 mile / 5280 ft = 0.0644 mile

36
Q

68 km = ? m

A

68 km x 1000 m / 1 km = 68,000 m

37
Q

1.35601 contains ? significant figures.

A

6

38
Q

0.151 contains ? significant figures.

A

3

39
Q

1.35601 + 0.151 = ? (give answer to correct number of significant figures)

A
  1. 1.35601 + 0.151 = 1.50701 = 1.507 (to the thousands place for 0.151)
40
Q

Classify each of the following as an element, compound, solution or heterogeneous mixture and explain your answer.

  1. Wine
  2. Tomato soup
  3. Tin
A
  1. Wine - is not on periodic table (not element) - no element names (not compound)appears to be one substance = Solution
  2. Tomato soup - is not on periodic table (not element) - no element names (not compound)appears to be one substance = Solution
  3. Tin - is on periodic table = Element
41
Q

Classify each of the following as a chemical change or a physical change

  1. Milk becomes sour
  2. Leaves change color in the fall
  3. Grass is mowed
A
  1. Milk becomes sour - the sour taste is due to a new substance being formed= chemical change
  2. Leaves change color in the fall - color changes usually = chemical change
  3. Grass is mowed - grass is still just smaller pieces of grass = physical change
42
Q

Show the full Nuclear symbol including any + or - charge (n), the atomic number (y), the mass number (x) and the correct element symbol (Z) for each element for which the protons, neutrons and electrons are shown - symbol should appear as follows:

Zx+/- ny

53 protons, 74 neutrons, 54 electrons

A

53 protons = I, 74 neutrons = I, 54 electrons = (+53 - 54 = -1) =

127^ I 53 -1 charge

43
Q

Name each of the following chemical compounds. Be sure to name all acids as acids (NOT for instance as binary compounds)

  1. SF6
A

SF6- binary molecular =

sulfur hexafluoride

44
Q

Name each of the following chemical compounds. Be sure to name all acids as acids (NOT for instance as binary compounds)

  1. (NH4)3 PO4
A

(NH4)PO4- nonbinary ionic = ammonium phosphate

45
Q

Name H2S

A

Acid and Hydrosulfuric Acid

46
Q

Write the formula for each of the following chemical compounds explaining the answer with appropriate charges and/or prefixes and/or suffixes.

  1. Iron (III) cyanide
  2. Diiodine pentoxide
  3. Potassium phosphide
A
  1. Fe(CN)3
  2. I2O5 - 2 I’s, and 5 O’s
  3. K3P
47
Q

Classify each of the following as an element, compound, solution or heterogeneous mixture and explain your answer.

  1. Oreo Cookie
  2. Sulfur Dioxide
  3. Grape Juice
A
  1. Heterogenous - two substances put together
  2. Compound - two element names
  3. Solution - Not on periodic table, no element names, appears to be one substance
48
Q

Classify each of the following as a chemical change or a physical change

  1. Grape juice ferments to wine
  2. Paper Burns
  3. Peeling the shell from a hard boiled egg
A
  1. Chemical
  2. Chemical
  3. Physical
49
Q
A

Chem103 (2 decks)

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