Honors OLD Chem
Give the name of the following compounds
a) CuO b) W2S5 c) P2O3
a) copper (II) oxide b) tungsten (V) sulfide c) diphosphorus trioxide.
When phosphorus becomes an ion
a) Does it gain or lose electrons?
b) how many electrons?
Carbon
12.01 g/mol
72.71%
The molecular formula of a compound with the empirical formula C2OH4 and a molar mass of 88 grams per mole.
What is C4O2H8
In the simplest whole number balanced equation for aluminum reacting with oxygen in a synthesis reaction, what is the coefficient of aluminum?
4
4Al + 3O2 → 2Al2O3
What element has an electron configuration ending with 4d9
Silver (Ag)
oxygen gas
32 g/mol
The Percent composition of carbon in HCN
What is H: 3.7% C: 44% N: 52%
Which of these is NOT an empirical formula
A) Mg3(PO4)2
B) C6H12O6
C) SO
B) can reduce to CH2O
Which of the following molecules are polar?
CO2 , PF3 , H2 , CH4
PF3
Give the name of the following compounds
a) W2S5 b) P2O3
a) tungsten (V) sulfide b) diphosphorus trioxide.
Water
18.02 g/mol
Percent oxygen in aluminum carbonate AND the volume in liters if the oxygen gas were extracted from 5 grams of aluminum carbonate
61.54% ; 2.15 L
Al2(CO3)3
A compound is found to contain 5.9% Hydrogen and 94.1% Oxygen and a molar mass of 34 g/mol. What are the empirical and molecular formulas of this compound?
HO and H2O2
Arrange the following from the most energy to the least energy.
radio, yellow, ultraviolet, microwave, blue, gamma
Gamma, UV, blue, yellow, microwave, radio
Which type of electromagnetic radiation has the most energy out of the following:
radio, yellow light, ultraviolet, microwave, blue light
UV
From most to least: UV, blue, yellow, microwave, radio
Aluminum
26.98 g/mol
What percentage of calcium hydroxide is calcium AND number of moles of calcium in 4 grams calcium hydroxide?
54.1% ; 0.054 moles
Ca(OH)2
A lab is performed to find a compound has a mass consisting of 9.03g of Magnesium which combines completely with 3.48 g of Nitrogen. What is the empirical formula?
Mg3N2
What is the shape of NH3?
Trigonal Pyramidal
In the simplest whole number balanced equation for aluminum reacting with oxygen in a synthesis reaction, what is the coefficient of aluminum?
4
4Al + 3O2 → 2Al2O3
Iron
55.84 g/mol
The percent of potassium in potassium nitrite.
What is 45.94%
KNO2
What is the molecular formula for a compound that has 36.0% C, 4.0% H, 28.0% N and 32.0% O and a molar mass of 300 g/mol
Molecular: C9H12N6O6
Empirical was C3H4N2O2