Download General Chemistry Worksheets Combined and more Exercises Chemistry in PDF only on Docsity!
IB Chemistry Worksheet 1: Significant Figures and Dimensional Analysis
For each problem below, write the equation and show your work. Always use units and box your final answer.
- Round each of the following numbers to four significant figures, and express the result in scientific notation:
a) 300.235800 _______________
b) 456,500 _______________
c) 0.006543210 _______________
d) 0.000957830 _______________
e) – 0.035000 _______________
- Carry out the following operations, and express the answers with the appropriate number of significant figures:
a) 1.24056 + 75.80 _______________
b) 23/67 - 75 _______________
c) 890,000 x 112.3 _______________
d) 78,132 / 2.50 _______________
- Perform the following conversions: (You need to go online to look up some conversion factors between metric and English units.)
a) 8.60 mi to m _______________
b) 3.00 days to s _______________
c) $1.55/gal to dollars per liter _______________
d) 75.00 mi/hr to m/s _______________
e) 55.35 ft 3 to cm 3 _______________
- The density of pure silver is 10.5 g/cm 3 at 20oC. If 5.25 g of pure silver pellets are added to a graduated cylinder containing 11.2 mL of water, to what volume level will the water in the cylinder rise?
- The density of air at ordinary atmospheric pressure and 25 o^ C is 1.19 g/L. What is the mass, in kilograms, of the air in a room that measures 12.5 x 15.5 x 8.0 ft?
IB Chemistry Worksheet 2: Structure of the Atom and the Periodic Table
For each problem below, write the equation and show your work. Always use units and box in your final answer.
- What were the main points of Dalton’s Atomic Theory? Which of these points are still accepted today? Which ones do we no longer accept, and why?
- Summarize the evidence used by J.J. Thomson to argue that cathode rays consist of negatively charged particles.
- Let’s pretend you are holding two atoms of carbon that are isotopes. Describe what the two atoms have in common and what they have different.
- Fill in the gaps in the following table, assuming each column represents a neutral atom:
Symbol
Protons 25 82
Neutrons 30 64
Electrons 48 56
Mass # 137 207
- Write the correct symbol, with both superscripts and subscripts, for each of the following:
a) the isotope of sodium with mass 23 _______________
b) the atom of vanadium that contains 28 neutrons _______________
c) the isotope of chlorine with mass 37 _______________
d) an atom of magnesium that has an equal number of
protons and neutrons _______________
- Give the name and the common charge for elements found in each of these groups of the Periodic Table: (a) Group 1
(b) Group 2
(c) Group 17
(d) Group 18
- Describe where each type of element is found on the Periodic Table. (a) Metals
(b) Non-metals
(c) Transition metals
(d) Lanthanides
(e) Actinides
- Write the balanced chemical equation for each reaction given below.
a. Zinc carbonate can be heated to form zinc oxide and carbon dioxide
b. On treatment with hydrofluoric acid, silicon dioxide forms silicon tetrafluoride and water.
c. Sulfur dioxide reacts with water to form sulfurous acid.
d. Liquid butane fuel (C 4 H 10 ) burns in the presence of oxygen gas.
e. Perchloric acid reacts with cadmium to form cadmium perchlorate and a gas.
f. A solution of sodium bromide reactions with a solution of vanadium (III) nitrate to form a brightly colored precipitate.
IB Chemistry Worksheet 4: Atomic and Molecular Masses
For each problem below, write the equation and show your work. Always use units and box in your final answer.
- What isotope is used as the standard in establishing the atomic mass scale?
- The atomic weight of magnesium is reported as 24.3, yet no atom of magnesium has the mass of 24. amu. Explain.
- Only two isotopes of copper occur naturally, Cu-63 (abundance 69.09 percent) and Cu-65 (abundance 30.91 percent). Calculate the average atomic mass of copper.
- Determine the molar mass of each of the following compounds:
(a) N 2 O 5
(b) FeCO 3
(c) Ca(C 2 H 3 O 2 ) (^2)
(d) (NH 4 ) 3 PO 4
(e) sodium nitrate
(f) copper (II) sulfate
(g) disilicon hexabromide
- Calculate the percentage by mass of oxygen in the following compounds:
a. NO 2
b. CH 3 COOCH 3
c. Cr(NO 3 ) (^3)
d. (NH 4 ) 2 CO 3
c. How can you determine the chemical formula of the product formed when the metallic element calcium combines with the nonmetallic element oxygen, O 2?
d. Write the balanced chemical equation for the reaction described in (c).
- Write a balanced chemical equation for the reaction that occurs when
a. the hydrocarbon heptane, C 7 H 16 (l), is combusted in air
b. the gasoline additive MTBE (methyl tertiary-butyl ether), C 5 H 12 O (l), burns in air
c. Rb (s) reacts with water
d. Mg(s) reacts with Cl 2 (g)
- Balance the following equations, and indicate what type of reaction each one is:
a. Al (s) + Cl 2 (g) → AlCl 3 (s)
b. C 2 H 4 (g) + O 2 (g) → CO 2 (g) + H 2 O (l)
c. Li(s) + N 2 (g) → Li 3 N (s)
d. PbCO 3 (s) → PbO (s) + CO 2 (g)
e. C 7 H 8 O 2 (l) + O 2 (g) → CO 2 (g) + H 2 O (l)
IB Chemistry Worksheet 6: The Mole
For each problem below, write the equation and show your work. Always use units and box in your final answer.
- The molecular formula of aspartame, the artificial sweetener marketed as NutraSweet, is C 14 H 18 N 2 O 5.
a. What is the molar mass of aspartame?
b. How many moles of aspartame are present in 1.00 mg of aspartame? (1000 mg = 1g)
c. How many molecules of aspartame are present in 1.00 mg of aspartame?
d. How many hydrogen atoms are present in 1.00 mg of aspartame?
- A sample of glucose, C 6 H 12 O 6 , contains 2.03 x 10^21 atoms of carbon.
a. How many atoms of hydrogen does it contain?
b. How many molecules of glucose does it contain?
c. How many moles of glucose does it contain?
d. What is the mass of the sample in grams?
IB Chemistry Worksheet 7: Empirical and Molecular Formulas
For each problem below, write the equation and show your work. Always use units and box in your final answer.
- Determine the empirical formula of each of the following compounds if a sample contains a) 0.104 mol K, 0.052 mol C, and 0.156 mol O
a) 5.28 g Sn and 3.37 g F
b) 87.5 percent N and 12.5 percent H by mass
- Determine the empirical formulas of the compounds with the following compositions by mass a) 10.4 percent C, 27.8 percent S, and 61.7 percent Cl
b) 21.7 percent C, 9.6 percent O, and 68.7 percent F
- What is the molecular formula of each of the following compounds? a) empirical formula CH 2 , molar mass = 84 g/mol
b) empirical formula NH 2 Cl, molar mass = 51.5 g/mol
- Determine the empirical and molecular formulas of each of the following substances: b) Ibuprofen, a headache remedy contains 75.69 percent C, 8.80 percent H, and 15.51 percent O by mass; molar mass about 206 g
c) Benzene contains only carbon and hydrogen and is 7.74% hydrogen by mass. The molar mass of benzene is 78.1 g/mol.
- Many homes in rural America are heated by propane gas, a compound that contains only carbon and hydrogen. Complete combustion of a sample of propane produced 2.641 g of carbon dioxide and 1.442 g of water as the only products. Find the empirical formula of propane. (Hint: Figure out how many moles of C and H were produced. They all came from the fuel.)
- (This is probably the hardest problem in the whole packet!) Menthol, the substance we can smell in mentholated cough drops, is composed of C, H, and O. A 0.1005 g sample of menthol is combusted, producing 0.2829 g of CO 2 and 0.1159 g of H 2 O. d) What is the empirical formula for menthol?
e) If the compound has a molar mass of 156 g/mol, what is its molecular formula?
m) How many grams of NaN 3 are required to produce 10.0 L of nitrogen gas if the gas has a density of 1. g/L?
- A piece of aluminum foil 0.550 mm thick and 1.00 cm square is allowed to react with bromine to form aluminum bromide. n) How many moles of aluminum were used? (The density of aluminum is 2.699 g/cm 3 .)
o) How many grams of aluminum bromide form, assuming that the aluminum reacts completely?
Name: ________________________
IB Chemistry Worksheet 9: Limiting Reactants & Theoretical Yield
For each problem below, write the equation and show your work. Always use units and box in your final answer.
- A manufacturer of bicycles has 50 wheels, 30 frames, and 24 seats. a) How many bicycles can be manufactured using these parts?
b) How many parts of each kind are left over?
c) Which part is like a limiting reactant in that it limits the production of bicycles?
- The fizz produced when an Alka-Seltzer tablet is dissolved in water is due to the reaction between sodium bicarbonate, NaHCO 3 , and citric acid, H 3 C 6 H 5 O 7
3 NaHCO 3 (aq) + H 3 C 6 H 5 O 7 (aq) --> 3 CO 2 (g) + 3 H 2 O(l) + Na 3 C 6 H 5 O 7 (aq)
- In a certain experiment 1.00 g of sodium bicarbonate and 1.00 g of citric acid are allowed to react. a) Which reactant is the limiting reactant? You must show work to support your answer.
b) How many grams of carbon dioxide form?
c) How much of the limiting reactant is left when the reaction is complete?
d) How much of the excess reactant remains after the reaction is complete?
- When hydrogen sulfide gas is bubbled into a solution of sodium hydroxide, the reaction forms sodium sulfide and water. How many grams of sodium sulfide are formed if 2.50 g of hydrogen sulfide is bubbled into a solution containing 1.85 g of sodium hydroxide, assuming that the limiting reagent is completely consumed?
IB Chemistry Worksheet 10: Personal Statement
- Write a paragraph to tell me about your Chemistry experience last year. What did you like and dislike? What were you good at and not so good at? What teaching and learning techniques work well for you?
- Write another paragraph to tell me about your hopes for IB Chemistry. What made you decide to take this class? How much effort are you willing to give to the class? What do you hope to take away from it?
(turn over for one last question!)
- Write one last paragraph to tell me about yourself. How would you describe yourself? What do you like to do? What are you involved in? What kind of goals do you have in your life?
