Chemistry Unit 1 HW Quiz

[1] Determine the number of significant figures in each of the following:

a) _____65.03mm

b) _____19.80ml

c) _____13 test tubes

d) _____6,708g

e) _____200cm

f) _____210cm

g) _____200.cm

h) _____200.0cm

i) _____0.00038g

j) _____0.0308300g

k) _____23,450s

l) _____9.82x10

[2] Round Each of the Following to three significant figures:

a) _____16.8477L

b) _____0.14986L

c) _____4.203x104km

d) _____0.00318756

e) _____5.6732

f) _____861.85

g) _____5.0981x10-3

h) _____0.09025011

I) _____99.99

[3] Rewrite 678,000,000,000,000 to show

a) 1 significant figure_ __________________b) 2 significant figures __________________c) 3 significant figures __________________d) 4 significant figures __________________e) 5 significant figures __________________

[4] Explain the difference in significant figure rules when performing addition and subtraction compared to multiplication and division.

[5] Significant Figures and Arithmetic Operations: perform the following calculations and report the final result using the correct number of significant digits.

a) 0.0222 x 0.7000 x 8.702 =

b) 7.8 x 6.44 / 14.26

c) 360 x 52.8795

d) 7487.89 5.5 x 10-2

e) 2.378 1.03

f) 0.0677 + 48.1 + 82.7655

g) 43.8316 – 29.5706

h) 330.35 - 3297.1

Section 2: Scientific Notation

[6] Convert the following numbers into scientific notation (watch your sigfigs)

a) 5,000,000

b) 572,000

c) 5,607,000,000

d) 200008

e) 2

f) 0.2

g) 0.002

h)0.00200

i) 0.00006789

j) 0.0000708432

[7] Convert the following numbers into standard notation

a) 2x1013

b) 6.204x104

c) (2x1013) x (3x103)

d) 2.3x100

e) 2x10-4

f) 402.3x10-3

g) 0.22x10-4

h) 1x10-9

[8] Perform the following operations and answer in scientific notation and standard notation

a) (3x108) x (2x101)

b) (2.5x108) x (3x101)

c) (4x104) x (6x101)

d) (4x108) x (3x102)

e) (6x108) / (2x104)

f) (8x108) / (2x102)

g) (6x104) / (3x106)

h) (4x105) / (8x10-3)

i) (2x103) x (3x102) / (2x103)

j) (4x103) x (3x105) / (3x10-2)

k) (6x104) + (3x104)

l) (6x104) - (3x104)

m) (6x104) + (3x103)

n) (6x104) - (3x103

Section 3: Metric Mania[9] Fill in the metric prefixes and abbreviations in the box below:

[10] Perform the following conversions using the ladder method:

a) 360cm à _____m

b) 2345mm à _____m

c) 25m à _____km

d) 2,345cm à _____km

e) 400mL à _____L

f) 2L à _____mL

g) 23.4L à _____mL

h) 13kL à_____ L

i) 934g à _____kg

j) 2.3kg à _____g

k) 445mg à _____g

l) 0.4kg à_____g

[11] Indicate which measurement is larger

a) 560cm or 6m b) 7g or 6980mgc) 1500mL or 1.5L d) 1500mL or 1.5kLe) 6000.1mg or 6gf) 36cm or 0.36mg) 3,445mL or 3.5Lh) 5kg or 500

[12] Circle the more reasonable measure: a) length of an ant 5mm or 5cm

b) length of an automobile 5m or 50 m

c) distance from NY to LA 450 km or 4,500 km

d) height of a dining table 75 mm or 75cm

[13] Will a tablecloth that is 155 cm long cover a table that is 1.6 m long? Explain your answer.

[14] A dollar bill is 15.6 cm long. If 200 dollar bills were laid end to end, how many meters long would the line be?

[15] The ceiling in Jan’s living room is 2.5m high. She has a hanging lamp that hangs down 41 cm. Her husband is exactly 0.0021km tall. Will he hit his head on the hanging lamp? Why or why not (justify mathematically)?

[16] Dr. O is playing in her garden again She needs 1 kg of potting soil for her plants. She has 750 g. How much more does she need? Explain your answer.

[17] One cereal bar has a mass of 37 g. What is the mass of 6 cereal bars? Is that more than or less than 1 kg? Explain your answer.

[18] Wanda needs to move 110 kg of rocks. She can carry 10 hg each trip. How many trips must she make? Explain your answer.

[19The ceiling in Mr. O’Connell’s living room is 2.4 m high. He has installed a new hanging lamp that hangs down 61 cm. He is approximately .175dekameters tall. Will he hit his head on the hanging lamp? Draw a sketch and show your work!

[20] Rank each object from heaviest to lightest.

[21] Rank the length of each object from longest to shortest given the objects below are not drawn to scale.

[22] Rank each object from heaviest to lightest.

Section 4: Unit Conversions and the Factor Label Method

[23] Perform the following conversions using the factor-label method (show units cancelling).

a) 2 hours à minutes

b) 4,500 seconds à minutes

c) 3 days à hours

d) 35 feet à yards

e) 4.5 Miles à Feet

f) 22,345ft à Miles

g) 22 yards à feet

h) 40 feet à yards

i) 784eggs à dozens

j) 500 kilometers à meters

k) 4,234 meters à kilometers

l) 245 centimeters à meters

m) 1 day à minutes

n) 1 dayà seconds

o) 1yr à seconds

p) 54cups à gallons

q) 35cups à tablespoons

r) 346teaspoons à gallons

[24] If water drips from a faucet at a rate of one drop every five seconds, how many liters could be collected after one day? Assume 20 drops equal one milliliter.

[25] Bamboo can grow at a rate of sixty centimeters per day. What is this growth rate in millimeters per minute?

[26] On your 17th birthday, how many seconds will you have lived?

[27] On the planet Shnoidia, everyone earns 80 Quatloos a day. One Zerumba (a favorite food item) costs 7 Quatloos. How many Zerumba’s can be purchased if someone works for 3 days?

[28] A clock goes from 1:15pm to 12:30am, how many seconds went by?

Section 5: Reading Labels

[29] Use the label below to answer the following questions:

a) How many chips are in a serving of Doritos?

b) How many calories are in one serving of Doritoes?

c) About how many Doritos are in the whole bag?

d) If the bag cost $3.99, how much does one Dorito cost?

e) How many calories are in 84 Doritos?

f) How many grams of protein are in 38 Doritos?

g) How many grams of sodium are in a bag of Doritos?

h) If you eat 23 Doritos how many grams fat do you consume?

[30] Use the label below to answer the following questions:

a) How many calories are in 5 cookies?

b) how many grams of fat are in 3 cookies?

c) Coming off of a very sad breakup, you binge eat 10 cookies. How many grams of sugar did you consume?

d) Suppose you want to sell cookies to your classmates and want to double your money. How much do you need to sell a cookie for?

Section 8: A Misleading Label:

[31] Bamboozled by Poultry Notice the label below. When you buy some types of chicken breast at the store your poultry product may be “enhanced” with up to 15% chicken broth. Notice the wording. Rather than telling you that when you buy 5lbs of chicken at $2.49 per pound, fifteen percent of what you are buying is salt water, the label tells you your product is being “enhanced”. The poultry companies will say this makes the chicken more moist and better tasting. While that may be true it is important to read labels. The statement about enhanced chicken is usually very small (fine print) and chicken is claimed to be all natural. While salt is natural and so is chicken, how is pumping salt into chicken “natural”? You have to be careful of the word “natural” on food labels. Its not regulated by the FDA and anything can be considered “natural”.

Suppose you were to buy 6.3lbs of chicken at a price of $2.49/lb…

a) how much money would that cost?

b) How many pounds of chicken did you actually get?

b) How much money did you pay for salt water?

c) If you exclude the salt water, how much do you actually pay for a pound of chicken?

Supplemental Accuracy and Precision Problems:

[1] What is accuracy?

[2] What is precision?

[3] Explain range and error in terms of accuracy and precision.

[4] For the four images below, describe each one in terms of accuracy and precision.

[5] A student determines the density of an aluminum cube four separates times. He obtains results of 2.43g/cm3, 2.44g/cm3, 2.42g/cm3 and 2.42g/cm3. The actual density of aluminum is 2.69g/cm3. How would you describe his results in terms of accuracy and precision?

[6] A student determines the density of an aluminum cube four separates times. He obtains results of 2.43g/cm3, 2.84g/cm3, 2.65g/cm3 and 2.93g/cm3. The actual density of aluminum is 2.69g/cm3. How would you describe his results in terms of accuracy and precision?