Module 1 Flashcards
(49 cards)
Convert 845.3 to exponential form and explain your answer
Because it is larger than 1, move the decimal 2 places = 8.453 x 10^2
Convert 3.21 x 10^-5 to ordinary form and explain
It would be 0.0000321, and because its -5, you move the decimal 5 spaces to the left.
24.6 grams to ? kg
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.
6.3 ft = ? inches
Since every 1ft is 12in, you can do 6.3ft x 12 in / 1 ft = 75.6 inches
28C = ? K
28 + 273 = 301 K
158 F = ? C
158 -32 / 1.8 = 70C
343 K = ? F
343 - 273 = 70C
70C x 1.8 + 32 = 158 F
Show the calculation of the mass of 18.6 ml sample of freon with a density of 1.49 g/ml?
M = D x V = 1.49 x 18.6 = 27.7g
Show the calculation of the density of crude oil if 26.3 g occupies 30.5 ml.
D = M / V = 26.3 / 30.5 = 0.862 g/ml
3.0600 contains how many significant figures
5
0.0151 contains how many significant figures?
3
3.0600 / 0.0151 = ? (give answer to correct number of significant figures
3.0600 / 0.0151 = 202.649 = 203 so 3 significant figures
Classify each of the following as an element, compond, solution, or heterogenous mixture and explain your answer?
- Coca Cola
- Calcium
- Chili
- 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)
- Calcium - It is an element because you can find it on the periodic table
- Chili - Not an element, not a compound, and it appears to be a mixture, which indicates a hetero mix.
Classify each of the following as a chemical change or physical change?
- Charcoal Buns
- Mixing cake batter with water
- Baking the batter to a cake
- Chemical
- Physical
- Chemical
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
31 protons = Ga31, 39 neutrons = ^70 Ga 31, 28 electrons = 31 - 28 = 3, which then equals ^70 Ga 31 ^+3
Name each of the following chemical compounds. Be sure to name all acids as acids (NOT for instance as binary compounds)
- PF
- Al2(CO3)3
- H2CrO4
- Binary and phosphorus pentafluoride
- Nonbinary and aluminmum carbonate
- Nonbinary and Chromic Acid
Write the formula for each of the following chemical compounds explaining the answer with appropriate charges and/or prefixes and/or suffixes.
- Carbon monoxide
- Manganese (IV) acetate
- Phosphorous acid
- Carbon Monoxide - ide = binary, mono = 1 0 = CO
- Manganese (IV) acetate - Mn^+4, C2H302^-1 = Mn(C2H3O4)4
- Phosphorus acid - nonbinary acid of H + phosphite (PO3^-3) = H3PO3
Melting ice to liquid water requires heat to be added, so process is
endothermic.
Cooling liquid water from 25° to 20° requires heat to be extracted, so the process is
exothermic
Determine the number of protons, electrons, and neutrons for the following: ^238 U 92
P: 92 E: 92 N: 146
Determine the number of protons, electrons, and neutrons for the following: ^35 Cl 17 ^-1
P: 17 E: 18 N: 18
For the following particles, write the symbol and charge:
A particle with 78 protons, 78 electrons and 117 neutrons:
^195 PT 78
What is the name of this polyatomic ion: CO₃²⁻
Carbonate
What is the name of this polyatomic ion: NH₄⁺
Ammonium
