Sig Figs and Conversions
What is the sig fig for 0.43003400?
6
What is the balanced chemical formula for Na+1 and PO4-3?
Na3PO4
What does “soluble” mean?
Chemical mixes fully into solution. No solids appear. Solution looks clear.
Find the percent composition by mass of each element in Ni(NO3)2. Use 3 sig figs.
32.1% Ni
15.3% N
52.5% O
What is the difference between oxidizing and reducing? What is the difference between oxidizing agent and reducing agent?
Oxidizing and reducing agent mean that the element loses electrons or the charge becomes more positive.
Oxidizing agent and reducing mean that the element gains electrons or the charge becomes more negative.
324.5 x 43.0 ÷ 90.?
160 OR 1.6 x 102+
What is the balanced chemical formula for ammonium perchlorate?
NH4ClO4
What does “insoluble” or “slightly soluble” mean?
Chemical does not fully mix with solution. Solid particles are seen. Solution is "foggy" or "cloudy".
Find the empirical formula of a compound containing 14.64 g O, 16.43 g C and 2.3 g H.
C3H5O2
How do you make 2.50 L of 0.750 M Ba(NO3)2 from solid Ba(NO3)2?
Add 490. grams of Ba(NO3)2 and dilute to 2.5 L with H2O.
Convert 345302000 sec to years.
10.9495 years OR 1.09495 x 10+1 years
What is the balanced equation of the following:
_ Ba(NO3)2 + _ NaCl → _ BaCl2 + _NaNO3?
1 Ba(NO3)2 + 2 NaCl → 1 BaCl2 + 2 NaNO3
Is Na2SO4 soluble or insoluble/slightly soluble?
Soluble
Find the formula of a hydrate containing 56.1% LiNO3 and 43.9% H2O.
LiNO2 * 3H2O
How do you make 4.00 L of 0.250 M K2Cr2O7 from a 3.0 M stock solution?
Add 0.33 L of stock solution and dilute with 3.67 L of water.
Convert 3.00 mm/sec to mi/yr.
58.8 mi/yr OR 5.88 x 10+1 mi/yr
What is the balanced equation for the combustion of butane (C4H10)?
2 C4H10 + 13 O2 → 8 CO2 + 10 H2O
Is Iron III oxide aqueous or solid?
Aqueous
How many grams CO2 can be produced from 25.1 g C6H6 and 86.9 g O2?
84.8 grams of CO2
Label or state what is oxidized and reduced as well as the oxidizing agent and reducing agent.
Cu(s) + NO3-1(aq) → Cu2+(aq) + NO(g)
Cu is oxidized and the reducing agent.
N is reduced and the oxidizing agent.
Convert 87600 lb/m3 to mg/L.
3.97 x 10+7 mg/L
What is the balanced chemical equation of the double displacement of barium nitrate and aluminum sulfate?
3 Ba(NO3)2 + 1 Al2(SO4)3 → 3 BaSO4 + 2 Al(NO3)3
What are all the states of the acid-base reaction of potassium hydroxide and sulfuric acid? Write out the whole balanced equation.
1 Ba(OH)2(aq) + 1 H2SO4 (aq) → 2 H2O(l) + 1BaSO4(s)
What is the percent yield when you made 80. grams of carbon dioxide in the lab?
(Based on question: How many grams CO2 can be produced from 25.1 g C6H6 and 86.9 g O2?)
94%
Balance the following redox reaction in basic solution.
Cl2(g) → Cl-1(aq) + OCl-1(aq)
Cl2(g) + 2OH-1 → Cl-1(aq) + OCl-1(aq) + H2O