Math and Moles
The Atom
Chemical Bonds and Geometry
Math and Moles pt.2
Reactions + Gasses
100
A solution contains 0.750 mol NaCl dissolved in 3.00 L of solution. What is the molarity?
0.250 M
100
What particle is responsible for an atom’s identity?
Protons
100
What is the molecular geometry of CO₂?
linear
100
How many moles are in 22 g of CO₂?
What is 0.50 mol?
100
In the reaction between AgNO₃ and NaCl, this solid forms.
What is AgCl?
200
A chemist needs to prepare 250.0 mL of 1.50 M HCl using a 6.00 M stock solution. What volume of stock solution is required?
62.5 mL
200
Two atoms of chlorine have different mass numbers because they differ in this particle.
neutrons
200
Which molecule has a bent geometry?
A. CH₄
B. CO₂
C. H₂O
D. BF₃
C. H2O
200
Balance this equation:
___ Fe + ___ O₂ → ___ Fe₂O₃
What is 4Fe + 3O₂ → 2Fe₂O₃?
200
In the reaction:
Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)
What is magnesium (Mg)?
300
A solution has a pH of 3. What is the hydronium ion concentration?
1×10-3
300
An element has the electron configuration:
1s² 2s² 2p⁶ 3s² 3p¹
Identify the element.
What is aluminum?
300
A molecule has four bonding regions and one lone pair on the central atom. What is its molecular geometry?
What is trigonal pyramidal?
300
A student has 5.0 mol of N₂ and 12.0 mol of H₂.
N₂ + 3H₂ → 2NH₃
Identify the limiting reactant.
What is H₂?
300
What is the density of carbon dioxide gas, CO₂, at 0.950 atm and 310 K?
What is A. 1.64 g/L?
400
A 300.0 mL solution has a concentration of 1.20 M. Water evaporates until the concentration becomes 2.00 M. What is the new volume?
180 mL
400
An ion has 54 electrons and 53 protons. Identify the element and charge. (what ion?)
I⁻
400
Draw the Lewis dot structure for HCN
400
A student reacts 15.0 g of magnesium with excess oxygen gas according to the following equation:
2Mg+O2→2MgO
The student collects 22.4 g of MgO after the reaction. What is the percent yield?
74.2%
400
Consider the reaction:
3Ba(NO3)2(aq)+2Na3PO4(aq)→Ba3(PO4)2(s)+6NaNO3(aq)
Which ions are spectator ions?
Na⁺ and NO₃⁻
500
A solution of Ca(OH)₂ has a concentration of:
0.0035 M
What is the pOH of the solution?
2.15
500
Determine the number of protons, neutrons, and electrons in a neutral atom of Iron-56.
What is A. 26 p, 30 n, 26 e?
500
Which molecule is polar?
A. CF₄
B. CO₂
C. NH₃
D. BeCl₂
NH3
500
Consider the reaction:
2Al+3Cl2→2AlCl3
If 6.00 mol of Al reacts with 7.00 mol of Cl₂, how many moles of the excess reactant remain after the reaction is complete?
What is 1.33 mol Al?
500
Predict the products and balance the reaction:
Al(NO3)3(aq)+Na3PO4(aq)→
Al(NO3)3(aq)+Na3PO4(aq)→AlPO4(s)+3NaNO3(aq)