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CHEMISTRY 1: FAC 0015

Tutorial 1 (Chapters 1-2)

1. Label the following as either a physical (P) or chemical (C) process:a. Corrosion of aluminium metal b. Melting of icec. Condensation of water d. Digesting a candy bare. Explosion of nitroglycerin f. Burning of a metal in air

g. Conducting electricity h. Boiling of ethanol

2. Identify the following properties as either intensive (I) or extensive (E) property:a. triple point of water b. mass of NaClc. concentration d. density of acetonee. molar volume of O2 gas f. vapor pressure of hexane at 25C

3. Perform the following conversions and express the answer with the appropriate number ofsignificant figures:a. 25.5 mg to g b. 4.0 x 10-10 m to nm

c. 0.575 mm to m d. 0.076 L to mL

e. 1.55 kg/m3 to g/L f. 5.850 gal/hr to L/s.

g 0.02500 ft3 to cm3 h. 62 F to Ci. 216.7 C to F j. 2500 F to Kk. 246.1 C to K

4. A cube of an unknown metal measures 1.61 mm on one side. The mass of the cube is 36 mg.Calculate the density of the metal in g/cm3. (Answer 8.63 g/cm3)

5. Gold can be hammered into extremely thin sheets called gold leaf. If a 200 mg piece of gold(density = 19.32 g/cm3) is hammered into a sheet measuring 2.4 x 1.0 ft, what is the averagethickness of the sheet in meters? How might the thickness be expressed without exponentialnotation, using an appropriate metric prefix? (4.6x10-8 m, 46 nm)

6. Two students conducted a laboratory exercise to determine the percentage of lead in a sample.The true percentage is 3.55%. The students results in three trials are as follows:Student A: 3.20, 3.15, 3.22Student B: 3.65, 3.58, 3.45

a. calculate the average percentage for each set of data and determine which set is moreaccurate based on the average. (A: 3.19%, B: 3.55%, B is more accurate)

b. Precision can be judged from the average deviation value. Using this value, determinewhich set of data is more precise.

(Set A = 0.03 lower value, more precise, Set B = 0.08)

7. What is the number of significant figures in each of the following measurements:a. 1282 kg b. 0.00296 sc. 0.0029600 s d. 8.070 mme. 0.0105 L f. 9.7750 x 10-4 cmg. 5.000 cm h. 204.080 gi. 5.4040 x 102 km j. 143,700

8. Carry out the following operations, and express the answers with the appropriate number ofsignificant figures:a. 21.2405 + 5.80 b. 13.577 21.6c. (5.03 x 10-4)(3.6675) d. 0.05770 75.3

e. (0.0045 x 20,000.0) + (2813 x 12) f. 863 x [1255

(3.45 x 108)]g. [(285.3 x 105) (1.200 x 103)] x 2.8954

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9. An individual suffering from a high cholesterol level in her blood has 232 mg of cholesterol per100 mL of blood. If the total blood volume of the individual is 5.2 L, how many grams of totalblood cholesterol does the individual contain? (12 g cholesterol)

10. Give the definition for the following terms:a. Atomic number (Z)b. Mass number (A)

c. Isotopesd. Molecular formulae. Empirical formulaf. Atomic weight.g. Metalloids

11. Fill in the blanks with the correct values.

SYMBOL NO. PROTON ( Z) NO. NEUTRON NO. ELECTRON MASS NO. (A)Cr

33 42 3320 20 20

86 86 22277 77 193

O2- 16Al3+ 27K+ 39Cl- 35Na+ 23Br- 80

Ca2+ 40S2- 32

Fe3+ 56

12. Provide the correct names or formulae for the given compounds.Name Chemical formula

(a) Copper(II) perchlorate(b) Iron(III) carbonate(c) CrCl3(d) Calcium hydrogen carbonate(e) H2SO4(f) Sulfurous acid(g) HBrO3(h) HBr

(i) H3PO4(j) Co(NO3)3(k) CuSO4.5H2O(l) Vanadium(III) bromide(m) Hydrogen cyanide(n) Tetraphosphorous hexasulfide