Isaac Physics Answers B7
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11 Chapter A Formulae & Equations The boxed fraction shows how many questions need to be answered correctly to achieve mastery. A2 Equations 10/12 A2.1 Write the atomic mass equation for the elements in the table below. Include the minor atoms in the parentheses. Show all your working in neat, clearly-presented answers. A.1 Empirical formulae (a) A2.2 Write the kinetic molecular theory equation for molecular weight using the data from the table. (i.e. M = m/n) A2.3 Calculate the molecular weight of the compound with the empirical formula C6H6O4S. (N = 6) A2.4 Calculate the empirical formula of C2H6O3S2 by combining the empirical formulae of the elements in C2H6O3S2. (O = 15) 2
11 Chapter A Formulae & Equations The boxed fraction shows how many questions need to be answered correctly to achieve mastery. A3 Isotopes 10/12 A3.1. Which of the following isotopes are the most abundant in the ground-state arrangement of the isotopes of carbon? What is their elemental symbol? A3.2. What is the empirical formula of carbon-12?
(i.e. C12H24N4O12S2)
A3.3. What is the empirical formula of carbon-14? (i.e. C14H14N4O12S2)
A3.4. What is the empirical formula of hydrogen-3? (i.e. H3O)
A3.5. Which isotope of oxygen is the most abundant in the ground-state arrangement of oxygen? What is its elemental symbol? A3.6. What is the empirical formula of oxygen-16? (i.e. O16H32O16S2)
A3.7. Which of the following isotopes of fluorine is the most abundant in the ground-state arrangement of the isotopes of fluorine? What is its elemental symbol? A3.8. What is the empirical formula of fluorine-19? (i.e. F19H37N5O12S2)
A3.9.
30 6 CHAPTER B. AMOUNT OF SUBSTANCE 31 / 33 B4 Unit conversions Use standard form where answers are outside the range 0.01 to 1000 units. B4.1 Convert the following volumes into m 3 a) 0.86 m 3 b) 200 cm 3 c) 45 ml d) 120 m 3 e) nm 3 f) 30 m 3 g) 5.0 m 3 h) 1100 mm 3 B4.2 Convert the following masses into g: a) 16.0 kg b) 120 mg c) kg f) 70 cl g) 1.6 mm 3 h) 1100 cc i) 2.2 km 3 j) 42.5 3 d) 12 tonne e) 54 g B4.3 Convert the following into standard SI units: a) 68 km h 1 f) 5.
29 5 CHAPTER B. AMOUNT OF SUBSTANCE 30 / 33 B3 Unit conversions Use standard form where answers are outside the range 0.01 to 1000 units. B3.1 Convert the following volumes into cm 3 a) 0.86 m 3 b) 200 cm 3 c) 45 ml d) 120 m 3 e) nm 3 B3.2 Convert the following masses into g: a) 16.0 kg b) 120 mg c) kg f) 70 cl g) 1.6 mm 3 h) 1100 cc i) 2.2 km 3 j) 42.5 3 d) 12 tonne e) 54 g B3.3 Convert the following into standard SI units: a) 68 km h 1 f) 5.0 h b) 500 g g) 740 nm c) 24 dm 3 h) 72 mn cm 1 d) 20 mbar e) 77 C i) 1014 mbar j) 13.8 g cm 3 B3.4 Give the results of the following calculations in standard SI units: a) Density = 250 g / 400 cm 3 b) Speed = 96 km / 80 min c) Concentration = 2.50 mmol / 40.0 cm 3 (use mol dm 3 ) d) Momentum = g 900 m s 1 e) Pressure = 590 fn / 10 nm 2 f) Volume = 240 pm 240 pm 320 pm g) Amount = 2.0 mol dm 3 75 m 3 h) Energy = C 2.4 kv 827ec27edc