The "Don't Make Me Cry" Questions
Protons and neutrons are found in this region of the atom.
Nucleus
The key to stoichiometry is using a balanced chemical equation to determine the _____.
Mole ratio.
The unit for the ideal gas constant is _____.
L atm/mol K
Which of the following is not an electrolyte?
a) MgBr2 b) HNO3 c) CBr4 d) all of them
CBr4
What symbol shows that a reaction is reversible?
⇌
This aqueous substance turns blue litmus paper to red.
a) acid b) base c) salt
Acid
+3 by losing 3 electrons
The mass of 2 moles of sodium oxide is ______.
61.98 g
25 L of a gas at constant pressure and 150 K is heated to 450 K. What is the new volume?
25 x 3 = 75 L
A solution that is able to dissolve more solute at a given temperature is
a) saturated b) unsat'd c) supersat'd
Unsaturated
When a reaction at equilibrium is stressed, it will react in a way to relieve that stress is called
Le Chatelier's Principle
A solution has a hydronium ion concentration of 1.0 x 10-9 M. What type of solution is this (acidic, basic, neutral)?
basic
Name the families which contain each of the following elements.
a) Ca b) Br c) Ne
a) alkaline earth metals
b) halogens
c) inert or noble gases
The synthesis of water is represented in the balanced chemical equation 2H2 + O2 → 2H2O
If you have 24 mole O2, ____ mole of water will be produced.
48 mole water
Determine the new pressure of a balloon at 1.00 L and 1.00 atm if the volume is decreased to 0.750 L.
1.33 atm
What is the molarity of a solution that has 0.25 moles of solute mixed into 750 mL of solution?
0.33 M
For the reaction
heat + N2(g) + O2(g) <−> 2NO(g)
If the system is cooled, the concentration of N2 will
increase
Sodium hydroxide reacts with sufluric acid in a neutralization reaction. Write the balanced equation.
2 NaOH + H2SO4 --> Na2SO4 + 2 H2O
Write the formula for iron(III) hydroxide.
Fe(OH)3
Combining CaCl2 and AgNO3 produces silver chloride and calcium nitrate. If 0.0150 mol CaCl2 are combined with excess AgNO3, how many moles of solid will be produced? (remember s.f.)
0.0300 mol AgCl
What is the pressure for 0.037 moles of oxygen in a 1.2 L container at 42 °C?
0.80 atm
A solution made from 5.844 g of sodium chloride in 350.0 mL of solution has what molarity?
0.2857 M
H2(g) + Cl2(g) ⇌ 2HCl(g)
Removing Cl2(g) will shift the reaction (left or right) and make (more or less) HCl
shift reaction left and make less HCl
A solution has a hydroxide ion concentration of 2.3 x 10-11 M. It has a pH of ____.
3.36
C3H8 + 5 O2 --> 3 CO2 + 4 H2O
How many grams of water (the only product) are formed when 25.0 g oxygen gas reacts with excess hydrogen gas?
28.2 g H2O
2.5 L of 0.0250 M HCl is combined with excess magnesium at standard temperature and pressure. Under these conditions, ____ L of hydrogen gas are produced.
0.70 L H2?
Which of the following combinations of solutions will form a precipitate? Give the formula of the ppt(s) formed.
*KOH and Na2CO3
*Na2SO4 and CuSO4
*K3PO4 and NiCl3
K3PO4 and NiCl3 forms NiPO4 (s)
2SO2(g) + O2(g) ⇌ 2SO3(g) + heat
Increasing pressure will shift the reaction (left, right, or not at all) and make (more, less, or no change) of O2
Shift right and make less O2
A titration was conducted where 3.4 mL of hydrochloric acid of unknown concentration was neutralized to end point using 13 mL of 0.21 M sodium hydroxide. The concentration of the acid is ____.
0.080 M HCl