Prefixes
Kilos: what is the symbol and conventional notation?
(k), 1000
Define Mass and Weight
Mass: a measure of the amount of matter in an object
Weight: the force that matter feels due to gravity
22 meters to km
0.022 km
When are leading zeros counted as a significant figure?
NEVER
A regulation NBA basketball has a surface area of 283 square inches. What is the surface area in square centimeters?
1830 square centimeters
centi: what is the symbol and conventional notation?
(cm), 0.01
Define element and compound
Element: A pure substance that cannot be broken down by a chemical change
Compound: a pure substance formed by chemically joining two or more elements
94 cm to inches
37.008 inches
How many significant figures in the following number?
10,500
3 significant figures
A patient is prescribed Esbriet for an autoimmune disease. The recommended maintenance dosage is 267mg/capsule, given in 9 capsules/day. What is the overall dosage in g Esbriet for a treatment duration of 2 weeks?
33.6 g Esbriet
(m), 0.001
Physical or Chemical change?
A truck door begins to rust after a winter storm
Chemical change
100 extra points: why? and what two molecules are reacting?
DOUBLE POINTS
24 miles to km
38.710
When are trailing zeros counted as significant figures?
When there is a zero anywhere in the number
The volume of an irregularly shaped solid can be determined from the volume of water it displaces. A graduated cylinder contains 19.9 mL of water. When a small piece of galena, an ore of lead, is added to the cylinder, it sinks and the volume increases to 24.5 mL. What is the volume of the piece of galena in cm3 and in L?
Volume of galena: 4.6 mL
Cubic cm: 4.6 cm3, Liters: 0.0046 L
micro: what is the symbol and conventional notation?
(µ), 0.000001
Physical or Chemical change?
water evaporating
Physical change
325 lbs to kg
147.727
How many significant figures are there in the following number?
0.0067080
5 significant figures
A furniture factory needs 31.5 ft2 of fabric to upholster one chair. Its Dutch supplier sends the fabric in bolts that hold exactly 200 m2. How many chairs can be upholstered with 3 bolts of fabric?
205 chairs
Tera: what is the symbol and conventional notation?
(T), 1,000,000,000,000
Physical or Chemical change?
salt dissolving in water
chemical change (hint: dissolving)
18.4 fl ounces to mL
544.64
DOUBLE POINTS
How do you round to the correct number of significant figures when multiplying/dividing two numbers?
Adding/subtracting?
*/÷ : the answer has the same number of sig figs as the original number with the fewest sig figs
+/- : The answer has the same number of sig figs as the number with the fewest DECIMAL places
Many international computer communications are carried by optical fibers in cables laid along the ocean floor. If one strand of optical fiber weighs 1.19 x 10-3 lb/m, what is the mass in kg of a cable made of six strands of optical fiber, each long enough to link to New York and Paris (8.84 x 103 km)?
28689.82 kg