Unit 1
Which of the following elements is a halogen?
A) Bromine (Br)
B) Sodium (Na)
C) Carbon (C)
D) Magnesium (Mg)
E) Phosphorus (P)
Bromine (Br)
Provide the name or formula for the following:
- aluminum sulfate
- CuCl2
- sulfur hexafluoride
- Cl2O7
Al2(SO4)2
copper (II) chloride
SF6
dichlorine heptoxide
Which compound below becomes a strong electrolyte when dissolved in water?
A) CCl4
B) NaCl
C)C6H12O6
D) CH3OH
E) H2
B) NaCl
Name the following acids and bases:
1. hydrochloric acid
2. sulfuric acid
3. sodium hydroxide
4. ammonia
If the average energy value of fat is 3.80×104 J/g, how many calories of energy are produced from 25.0 grams of fat?
1 calorie (cal) = 4.184 J
2.27×105 cal
The mass of a neutron is 1.67×10−27 kg. What is the mass of the neutron in milligrams (mg)?
1.67×10−21mg
A gas has a volume of 10.0 L and is at a temperature of 300 K. If the temperature of the gas is increased to 600 K, what is the new volume of the gas, assuming pressure and the amount of gas stay constant?
20.0 L
In each of the following equations, identify the Brønsted–Lowry acid and base in the reactants:
A. HCl(aq)+H2O(l)→H3O+(aq)+Cl−(aq)
B. HF(aq)+H2O(l)→H3O+(aq)+F−(aq)
C. NH3(aq)+H2O(l)→NH4+(aq)+OH−(aq)
A.
B.
C.
The ground-state electron configuration of the element ________ is [Ar]4s23d5.
A) Mn
B) Cr
C) Fe
D) Co
E) Ti
Cr (Chromium)
Calculate the number of sulfur atoms in a 150 g sample of SO2.
1.41×1024 sulfur atoms
How much NaCl is in 500 g of a 12.5% (m/m) NaCl solution?
62.5 g
For the reaction of acetic acid and water, which is the stronger acid in the equilibrium?
CH3COOH(aq)+H2O(l)⇌CH3COO−(aq)+H3O+(aq)
acetic acid
Arrange the following elements in order of increasing ionization energy:
Na, Al, S, Cl
Na < Al < S < Cl
Rank the following compounds by increasing boiling point: NH3, CH2Cl2, H2, H2O
H2O, NH3, CH2Cl2, H2
Based on the solubility guidelines, which of the following cations would form a precipitate in water with carbonate (CO32−) anion but not with sulfate (SO42−) anion?
A) Ca2+
B) Ba2+
C) Mg2+
D) Fe3+
C) Mg2+
What is the equilibrium concentration of HClO if the equilibrium concentrations of ClO− and H3O+ are each found to be 3.1×10−3 M?
HClO(aq)+H2O(l)⇌H3O+(aq)+ClO−(aq)
Ka=2.8×10−8
345 M
A hypothetical element Y has two naturally occurring isotopes. The percent (%) abundance and atomic mass of each isotope are given below:
Isotope 1 - 25.00% abundance, 10.00 amu
Isotope 2 - 75.00% abundance, 11.00 amu
What is the average atomic mass of element Y?
10.75 amu
Draw the lewis structure for CH2O and the dipole arrows. What is the polarity of the compound as a whole? How many bonding and non-bonding electrons are present?
polar compound
8 bonding electrons
4 non-bonding electrons
According to the reaction given below, how many grams of solid Cu(OH)2 are formed when 150 mL of 3.50 M aqueous NaOH reacts with excess aqueous CuSO4? (Note: Molar Mass of Cu(OH)2 is 97.57 g/mol)
CuSO4(aq)+2NaOH(aq)→Cu(OH)2(s)+Na2SO4(aq)
25.6 grams of Cu(OH)2
Write a balanced chemical equation for the following reactions of acids:
1. HCl(aq)+Cu(OH)2(s)→CuCl2(aq)+2H2O(l)
2.HNO3(aq)+Na2CO3(s)→NaNO3(aq)+CO2(g)+H2O(l)