Transcript
CHEM 101 2014 – Recitation Week 2
Ch. 1, 62. Which statements about subatomic particles are false?
a. Protons and electrons have charges of the same magnitude but opposite signs.____
b. Protons have about the same mass as neutrons.____
c. Some atoms don’t have any protons.____
d. Protons and neutrons have charges of the same magnitude but opposite signs.____
Ch. 1, 64. Write isotopic symbols in the form for each isotope.
a. The copper isotope with 34 neutrons.
c. The potassium isotope with 21 neutrons.
Ch. 1, 86. Fill in the blank boxes to complete the table below.
Symbol Z A Number
of p+
Number
of e- Number
of n Charge
Si
14
14 14
S2-
32
2-
Cu2+
34 2+
15
15 16
Ch. 2, 16. A scale used to weight produce at the market has markings every 0.1 kg. Which measurement for the mass of a dozen apples is correctly reported for this scale?
a. 1.67 kg b. 1.9 kg c. 1.875 kg
Ch. 2, 23. Ethylene glycol (antifreeze) has a density of 1.11 g/cm3.
a. What is the mass in g of 417 mL of this liquid?
b. What is the volume in L of 4.1 kg of this liquid?
Ch. 2, 40. An ibuprofen suspension for infants contains 100 mg/5.0 mL suspension. The recommended dose is 10 mg/kg body weight. How many mL of this suspension should be given to an infant weighing 18 lbs? (1 lb = 453.59 g)
Ch. 2, 52. What is the mass of 4.91 x 1021 platinum atoms?
Ch. 2, 70. The Honda Insight, a hybrid vehicle, has an US Environmental Protection Agency (EPA) gas mileage rating of 57 mi/gal in the city. How many km can the Insight travel on the amount of gasoline that would fit in a soda can? The volume of a soda can is 355 mL.
(1 gal = 3.78 L; 1 mile = 1.6 km)
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