Nomenclature
What are the written formulas of: Ca(OH)2 and HCl?
Calcium Hydroxide and Hydrochloric Acid
What is the density of a material if a sample with a mass of 45.82 g takes up a volume of 8.75 mL?
5.24 g/mL
A carbon isotope has an atomic mass of 17, how many protons, neutrons and electrons does it have?
p: 6; n: 11; e: 6
What is the molarity of a solution if 0.00513 moles are suspended in 20 mL?
0.257 M
What is the oxidation state/number of P4?
0- elemental form
What are the chemical formulas of: hydrosulfuric acid and cobalt (III) oxide?
H2S and Co2O3
What volume of acetone would have a mass of 142.5 g? The density of acetone is 0.784 g/mL.
182 mL
What are the names of these polyatomic anions:
PO4-3 & OH-
Phosphate and Hydroxide
What is the concentration of a NaCl solution that results when 0.150L of a 0.556M solution is allowed to evaporate until the volume is reduced to 0.0105L?
0.794 M
What is the oxidation state/number for each element in NO?
N=+2; O=-2
Give the missing chemical and written formulas: CH3COOH and phosphorus trifluoride
Acetic Acid and PF3
What mass would a sample of 32.6 cm³ of copper be? The density of copper is 8.96 g/cm3.
292 g
28Si= 92.23% ;29 Si=4.67% ;30Si= 3.10%
What is the average atomic mass of Silicon?
28.1 amu
What is the Molarity of a 3.5L solution with 5.0kg of NaCl suspended in it?
24.5 M NaCl
What is the oxidation state/number for each element in SO3-2?
S= +4; O= -2
Give the missing chemical and written formulas: Carbon tetrachloride & NaBr & SO2
CCl4 & Sodium Bromide & Sulfur dioxide
A sphere has a diameter of 20.00 cm. Calculate the volume, in cm³, of the sphere. The volume of a sphere is given by the formula:
V=(4/3)πr3
π=3.1416
V= 4188.8cm3
The atomic masses of 6Li and 7Li are 6.0151 amu and 7.0160 amu, respectively. Calculate the natural abundances of these two isotopes in units of percent. The average atomic mass of Li is 6.941 amu.
6Li abundance = 7.49% and
7Li abundance = 92.51%
What is the molarity of a 4.00 L dilution made from a 0.350 M solution that was originally 2.35 L ?
0.206 M
What is the oxidation state/number for each element in CH2O?
C=0; H=+1; O=-2
Give the missing chemical and written formulas: Zn(NO2)2 & CuOH & potassium hydroxide
Zinc Nitrite & Copper(I) hydroxide & KOH
If a sphere has a volume of 4188.8cm3 and is made of pure titanium (density = 4.506 g/cm³), what is the sphere's mass in kg?
18.88 kg
The atomic masses of 35Cl and 37Cl are 34.9689 amu and 36.9659 amu, respectively.
Calculate the natural abundances of these two isotopes in units of percent.
The average atomic mass of chlorine is 35.453 amu.
³⁵Cl natural abundance = 75.8%
³⁷Cl natural abundance = 24.2%
What will be the molarity of a solution that contains 100 g of KOH and 1500 mL of solution? What would be the new molarity of the solution if it is diluted to 0.005M?
Initial molarity = 1.19 M
New volume after dilution to 0.005 M = 357 L
Identify what is being oxidized and what is being reduced.
2NO + Cl2 ---> 2NOCl
N: (+2)->(+3)
O: (-2) -> (-2)
Cl:(0)->(-1)
Cl is being reduced and N is being oxidized!