Chin Yuki 2207 - 1713 5653 APPLY YOUR KNOWLEDGE 1. Classify each of the following as Element (E), Compound (C), Heterogeneous mixtures (HT), Homogenous Mixture (HM) a) b) c) d) Silver nitrate C raisin bread HT fresh milk HM baby oil HM e) f) g) h) coconut shake HT gold F- (Aurum ) smoke exhaust HT Air HM i) j) k) l) saltwater HT tossed salad HT cream cheese HT / HM diamond F- Carbon) 2. Base on the properties of calcium carbide (a ripening agent for mangoes) in table below, identify the physical properties and chemical properties. ♦ is odourless pp ♦ Melts at 2160 °C pp ♦ greyish-white in colour pp ♦ Has a density of 2.22 g/cm3 pp ♦ one mole of calcium carbide has a mass of 64.10g pp ♦ react with water to produce acetylene and calcium hydroxide CP ♦ react with nitrogen to produce calcium cyanide and carbon CP 3. Identify each of the following scenario as a physical change or chemical change Scenario Change iron metal rusts Chemical Change magnesium metal gives off a bright light when it burns Chemical Change mixing baking soda and vinegar produces a gas Chemical Change Frost forms as the temperature drops on a humid winter night Perspiration evaporates when you relax after jogging Physical change Physical change A cornstalk grows from a seed that is watered and fertilized chemical change sugar dissolves in water Physical change All digits in a measurement are significant except zeroes used only to position the decimal point , Zeroes that significant before or point as , , end a whether number are they occur u after the decimal as a decimal point long present If no decimal point is present zeroes at the end of the is . , number are not 4. What are the rules for significant figures? Explain c5. Identify the measurement of these objects to the correct number of significant figures by using metric ruler. a) your own smartphone (width) 7.9cm c) 50 cents coin (diameter) 2.3cm b) A4 paper (length) 29.7cm CHAPTER 1; MATTER & MEASUREMENTS . significant . 6. Rewrite the following numbers using scientific notation -5cmx 10-5 a) 0.000097254 m = 9.7254×10 4.0087 b) 438 965 889 399 s = 4. 3897×10 6.2 xs 102 c) USD 1 089 720 = USD 1.089×106 d) Population of urban people in Brunei, 351 873 =43.519×105 x 105 people e) average distance from the Earth to the Moon, 383,000,000 m = 3.83 " ✗ 108m 7. Please read each instrument to their limits. Include units and correct number of Significance Figures. a) 85.7 % 85.5 Trans b) c) 7.35mL 7.5mm 8. Explain the observation of the following experiments (accuracy , precision & error) Not Accurate Systematic accurate Error Systematic Accurate Not Precise Precise error Precise Random error Not Accurate Not Precise Random error 9. Calculate the answers to the appropriate number of significant figures a) 669.5 mg -31.444 mg = 638.1mg d) 12.3652 m x 12.78 m / 1.057 cm = 14950m 0.9033781m b) 0.0022099 m + 0.9011682 m = e) 0.002683 x 0.033 = 8.9×10-5 c) 9568.5 kg/3.95 m3 = 2420kg / m3 CHAPTER 1; MATTER & MEASUREMENTS 67.0g 1mL 10. Convert the; -14.7mL 4.56g a) What is the density of an object that has a mass of 67.0 g and a volume of 14.7 mL? b) A child has a body temperature of 38.7°C, and normal body temperature is 98.6°F. Does the child have a fever? What is the child’s temperature in kelvins? 38.7°C 311.85K ' = Normal body temperature is 98.6°F Yes , the child had fever due = 37°C above to the normal temperature . 11. The gasoline in an automobile gas tank has a mass of 60.0kg and a density of 0.752 g/cm3. Identify the volume in cm3. 0.06g 104cm} 075255mi = 7-98 ✗ 12. To wire your stereo equipment, you need 325 centimeters (cm) of speaker wire that sells for $0.15/ft. What is the price of the wire? $-1.60 13. A prescription medication requires 0.00225 g per pound of body weight. Convert this quantity to the number of mg required per kg of body weight and identify the correct dose (in mg) per 80kg patient. 4.96×10-6 mg 1kg 3.969×10-4 my , 14. Oil of wintergreen is a colorless liquid used as a flavoring. A 28.1-g sample of oil of wintergreen has a volume of 23.7 mL. What is the density of oil of wintergreen? ??÷< =L -1991mL 15. The speed limit on many highways in Malaysia 90km/hr. convert this speed into; a) mph 55.926 mph c) m/day 2-16×106 ml day 1. 063×109 ft / 5 b) ft/s d) yd/min 1640 -4yd / min 12 . 325cm (325×2.5--4) in = = = = 13 0,0%25-9 . (0-00225×10-3) my 12795in ( 14¥ ) feet = 10.66 feet Price of wire = 10.60 = $1.60 ✗ $0.15 = 4.96×10-6 pose for mg / kg 80kg patient (80×4.96) my -_ = CHAPTER 1; MATTER & MEASUREMENTS 3.969×10 -4mg