Review questions honors chem

The coldest temperature recorded in Antartica, the home of the emperor penguin, was recorded to be -89 C at the Voskok Station on July 21, 1983. An American scientist converted -89 C to F for the benefit the media. What temperature did the media report to the public expressed in F?

-128 F

In Geneva, on the April 10, 2007, the first sector of CERN's Large Hadron Collider (LHC) was cooled to reach a temperature of 1.9 K. That is cooler than deep outer space! What was the temperature of this sector of the LHC expressed in F?

-456.0 F

The average energy consumption for a new Samsung refrigerator is 5.47 x 10^2 kWh/year. What is the average energy consumption of this refrigerator in gigajoules per day? (1 GJ = 277.8 kWh, 1 year - 365 days)

0.00539 GJ/day

Silver has a density of 10.5 g/cm3. If you have a pure silver coin with a mass of 6.00g, what is the volume of silver in the coin? Express your answer in units of mL (1mL = 1cm3)

0.571 mL

What is the meaning of each of the following labels? 1. fire symbol 2. human upper body with lines near respiratory 3. exclamation point 4. test tubes pouring on a hand and a substance 5. dead fish floating in water

1. flammable and combustible 2. carcinogen 3. irritant or narcotic effects 4. corrosion 5. aquatic toxicity

Give the use of the following pieces of equipment 1. Erlenmeyer flask 2. Graduated cylinder 3. Crucible 4. Utility clamp 5. Test tube holder

1. holds liquid 2. measures liquids or volume 3. heat 4. clamp a test tube upright 5. holds test tubes

Standard atmospheric pressure on a cold day(0 C) at sea level id 14.7 lb/in2 (psi). Determine this atmospheric pressure in units of kg/cm2. (1.00 lb = 454g)

1.03 kg/cm2

What is the smallest number that could result from subtracting 22m +/- 2m from 38m +/- 3 m?

11 m

The density of mercury metal is 13.6 g/mL. What is the mass of 1.00 L of mercury? Express your answer in kg.

13.6 kg

How many meters could a Mini travel if its tank contained 120 dL of fuel? (14.25 km/L)

170000 m

Determine the answer with the correct number of significant figures (1.415g/ 1.6mL) + (0.240 g/ 0.311mL) - (40.304 g/ 0.2113 mL)

192.4 g/mL

The density of pure iridium metal is 22.68 kg/dm3. Express this density in units of g/cm3)

22.68 g/cm3

The density of pure iridium metal is 22.68 kg/dm3. Express this density in units of g/cm3.

22.68 g/cm3

This ignition temperature is the temperature at which something catches fire and burns on its own. The ignition temperature of paper is 451 F. What is this value in C?

233 C

Isopropyl alcohol has density of 8.34 lb/gal. A large jug of it weighs 2.3 kg. Determine the volume of this jug in mL. (454 g= 1lb)

2800 mL

The maximum highway speed limit in some States is 110 km/h. Express this speed in units of meters per second.

31 m/s

The density of tantalum is 16.7 g/mL. What is this value in units of lb/L? (1.00kg = 22.1 lb)

36.9 lb/L

The official Mini website states the the Mini Cooper gets 14.25 km/L fuel economy. Express this value in miles per gallon. (1.609km =1mile, 1gal=4.546 L)

40.26 mi/gal

The dimensions of a rectangle are measured to be 19.9 +/- 0.1 cm and 2.4 +/- 0.1cm. What is the area of the rectangle, including the range of uncertainty?

48 +/- 3 cm2

A springlike day in Denver Colorado in February may register a temperature of 9.0 C. Convert to F.

48.2 F

What is the engine piston displacement in L of an engine whose displacement is listed as 325 in3? (1L = 1 dm3)

5.33 L

The planet of Purr is fond of cats of all types. The inhabitants trade animals with one another: 1 calico is worth 5 Siamese; 2 Siamese are worth 7 Persians; 3 Persians are worth 8 tabbies; 1 tabby is worth 6 Heinz Fifty-Sevens. An inhabitant of Purr owns 2 calico cats. How many Heinz Fifty-Sevens may she obtain?

560 Heinz Fifty-Sevens

The planet of Bark is fond of dogs of all types. The inhabitants trade the animals as much as art collections on Earth trade sculptures and paintings: 1 pit bull is worth 3 collies; 2 collies are worth 5 poodles; 3 poodles are worth 7 dobermans; 1 doberman is worth 9 german sheep dogs. An inhabitant of Bark owns 4 pit bulls. How many German sheep dogs may she obtain?

630 German sheep dogs

If a gallon of paint can cover 400 square feet what is this paint coverage expressed in square meters per Liter. (1 gal = 4.546 L)

8.17 m2/L

A chunk of nickel has a mass of 9.0 g and a volume of 1.01 mL. What is its density?

8.9 g/mL

What is the mass, including uncertainty, arrived at as the result of summing 45.04 g +/- 0.03g and 39.04g +/- 0.02g?

84.08 g +/- 0.05 g

The density of copper is 8.9 g/mL. What is the mass of a 10.8 mL piece of copper?

96 g

What do you think is safer: the laboratory or you kitchen? Explain.

A lab has more safety equipment but more hazards than a kitchen

Knowing you have lab on a particular school day, describe how you should dress

A student should wear close toed shoes, natural fibers, no dangling or loose clothes, or jewlery

What is an SDS? Where might an SDS be found in your school?

An MSDS is a material data safety sheet. They are often stored in a binder in the stockroom. They are also available online (a Canvas class page).

What is the most common injury in the chemistry lab? How might you avoid this injury? How would you treat this injury?

Burns are the most common injury in the chemistry lab. You might avoid the injury if you handle hot equipment with the appropriate tongs, test tube holders, or mitts. Bring hand neat the object to test for heat. A burn may be treated with ice.

Why do you suppose food and drink are not allowed during lab?

Food may become contaminated and you may drink the wrong substance

Outline the route you should follow in case of a fire alarm while your are in chemistry class

In case of a fire alarm while in chemistry class, we should go down the bell tower stairs, across the grass and towards the 7th street parking lot. In other words, exit North then East to 7th street.

is each qualitative or quantitative? a) attracts to a magnet b) Changes to Br2(/) at -7.2 C c) Has a density of 4.71 g/mL d) Is a bright orange solid crystal

Qualitative- a d Quantitative- b c

is each qualitative or quantitative? a) freezes at 52.0 C b) dissolves in ethanol glycol c) Fractures in cubic crystals d) 5.4 mol dissolve in each liter

Qualitative- b c Quantitative- a d

List three things you should do before beginning any chemistry experiment

Read the lab Know the safety procedures and wear safety glasses Have your instructor's permission

Where is the closest fire alarm to your chemistry laboratory?

The closest fire alarm is to the right of each classroom door

Two students weigh the same object with a known mass of 0.68 g. One student obtains a mass of 0.72 g, while the other gets a mass of 0.64 g. How do their percent error and absolute errors compare to each other?

Their percent errors are the same values but opposite signs absolute error of 0.72g = 0.04 g absolute error of 0.73g = -0.04 g total error= 6%

How many fire extinguishers are in your laboratory? What are their classifications?

There is 1 fire extinguisher in the laboratory. The classifications is for A, B, and C fires.

outline a three-step procedure for cleaning glassware at the end of the period

Using soap and the proper brush, wash glassware then rinse it. It may be left to air dry.

Give three uses for a fume hood

Vent toxic fumes, odors, and smoke Store organic substances Shield students from harmful reactions

Convert the following. a) 83.90 kJ--> MJ b) 2.54 kg--> cg c) 600.0 dW--> nW d) 355mL-->cL e) 185das-->ms f) 987km-->dm

a) 0.08360 MJ b) 2.54 x 10^5 cg c) 6.000 x 10^10 nW d) 35.5 cL e) 1.85 x 10^6 ms f) 9.87 x 10^6 dm

Solve a) (10^-4)^3 b) (4 x 10^5)^3 c) (7 x 10^9)^2 d) (10^2)^2 x (2 x 10)^3

a) 1 x 10^-12 b) 6.4 x 10^16 c) 4.9 x 10^19 d) 8 x 10^7

Give the product or quotient a) (3.5 x 10^4) x (3.0 x 10^5) b) (7.0 x 10^6) / (1.75 x 10^2) c) (2.5 x 10^-3) x (8.5 x 10^-5) d) (2.6 x 10^5) / (6.5 x 10^-2)

a) 1.1 x 10^10 b) 4.0 x 10^4 c) 2.1 x 10^-7 d) 4.0 x 10^6

Give the product or quotient of each of the following problems a) (8.0 x 10^3) x (1.5 x 10^6) b) (1.5 x 10^4) / (2.0 x 10^2) c) (3.5 x 10^-2) x (6.0 x 10^5) d) (2.6 x 10^7) / (6.5 x 10^-4)

a) 1.2 x 10^10 b) 7.5 x 10^1 c) 2.1 x 10^4 d) 4.0 x 10^10

How would you assist your lab partner in each of the following cases? a) Partner has spilled a chemical into their eyes b) Partner's clothing has caught fire c) Partner has spilled concentrated acid onto the floor d)Partner took more chemical than required for the lab e)Partner has broken a test tube on the floor

a) 10-15 min eyewash b) stop, drop, and roll c) notify the teacher and neutralize the acid (with sodium bicarbonate/baking soda) d)share or place in the proper chemical waste container e) notify the teacher then sweep up the broken glass and place in a broken glass waste container

The label on a bottle of mood-elevating medication states that each tablet contains 25.0 mg of imipramine. A test conducted by the bureau of standards shows a tablet to contain 28.0 mg. Legally, drug companies are allowed to be within plus or minus 5% of their labelled quantities. a) Give the percentage uncertainty for the imipramine tablets b) Is the drug company within the legally allowed limits for the tablets?

a) 12 b) no

Carry out the following operations and give the answers with the correct number of significant figures. Pay close attention to the units a) 14.6 cm x 12.2 cm x 9.3 cm b) 28.0 m x 16.0 m x 7.0 m

a) 1700 b) cm3 c) 3100 d) m3

Solve a) (6.4 x 10^-6 + 2.0 x 10^-7) / (2 x 10^6 + 3.1 x 10^7) b) (3.4 x 10^-17 x 1.5 x 10^4) / (1.5 x 10^-4) c) (2 x 10^3)^3 x [(6.84 x 10^3)/ (3.42 x10^3)] d) [(3 x 10^2)^3 + (4 x 10^3)^2)] / (1 x 10^4)

a) 2.0 x 10^-13 b) 3.4 x 10^-9 c) 1.6 x 10^10 d) 4.3 x 10^3

Solve a) (2.115 x 10^8) - (1.11 x 10^7) b) (9.332 x 10^-3) + (6.903 x 10^-4) c) (68.166 x 10^2) + (1 x 10^-1)

a) 2.00 x 10^8 b) 1.0022 x 10^-2 c) 6.1867 x 10^3

Solve a) (4.034 x 10^5) - (2.12 x 10^4) b) (3.114 x 10^-6) + (2.301 x 10^-5) c) (26.022 x 10^2) + (7.04 x 10^-1)

a) 3.822 x 10^5 b) 2.612 x 10^-5 c) 2.6029 x 10^3

Determine the number of significant figures in each of the following measurements a) 0.1407m b) 21.05mg c) 570.00km d) 0.0030cm e) 250m f) 10035.00 cm3 g) 2800g h) 5000 C i) 1.1 x 10^2 kPa j) 5.35 x 10^-2 m/h

a) 4 b) 4 c) 5 d) 2 e) 2 f) 7 g) 2 h) 1 i) 2 j) 3

Convert the following. a) 415 μg-->g b) 384.4 Mm-->m c) 3.976 g-->μg d) 4.5 dm--> m e) 1.05 x 10^-12 g-->ng f) 24.99 km --> m

a) 4.15 x 10^-4 g b) 3.844 x 10^8 m c) 3.976 x 10^6 μg d) 0.45 m e) 1.05 x 10^-3 ng f) 24990 m

Express the following in proper scientific notation. Then indicate the correct number of significant figures in the value a) 4907 L b) 0.000052 m c) 7900 g d) 0.06030 ft e) 790.0 lb

a) 4.907 x 10^3, 4 b) 5.2 x 10^-5, 2 c) 7.9 x 10^3, 2 d) 6.030 x 10^-2, 4 e) 7.900 x 10^2, 4

Determine the answer to each the following with the correct number of significant figures a) (8.4 g + 3.0 g + 4.175g)/ 3 b) (9.00 x 10^-23 units x 2.9900 x 10^-25 units)/ (2.9 x 10^-9 units) c) (5.9 x 10^-12 u + 7.80 x 10^-13 u)/ (4 x 10^12 u + 6.700 x 10^13 u)

a) 5.2 g b) 9.3 x 10^-39 units c) 9.4 x 10^-26 u

Carry out the following operations and give the answers with the correct number of significant figures a) 6.08 g + 7g + 0.05g b) 481.33 mL - 37.1 mL c) 6620s + 35.7 s + 1.00s d) 0.007m + 0.100m + 0.020m

a) 615 g b) 444.2 mL c) 6660 s d) 0.127 m

Determine the errors and correct them according to the SI system a) The package contained 750 Gm of linguine. b) The car accelerated to 90 km per hour in 10 sec. c) The recipe called for 1 ML of vanilla and 250 cc of milk. d) Jordan put 250 gms of mushrooms on his pizza.

a) 750 g b) km/h, 10 s c) mL, mL d) g, in.

Volume Copper Aluminum Platinum 2.0 17.4 5.4 42.9 8.0 71.7 21.6 171.6 12.0 107.5 32.4 257.4 15.0 134.4 40.5 321.8 19.0 170.2 51.3 407.6 a) determine the constant for each metal b) the constant represents the metal's density. Which is the most dense?

a) Cu 9.1 g/mL Al 2.7 or 2.0 g/mL Pt 21 g/mL b) platinum

Give the use of each of the following pieces of equipment a) beaker tongs b)crucible tongs c)ring stand d)ceramic pad (wire gauze)

a) pick up a beaker b) pick up a crucible c) hold rings, clamps d) sits on a ring for heating

Where would you dispose of each of the following? a) a few mL of excess dilute acid b) a sample of heavy metal precipitate c)an excess piece of glass tubing d) used litmus paper e)a few mL of excess acetone (nail polish remover)

a) sink (run water before and after) b) waste container (disposal jar) c) glass waster container d) garbage can e) organic waste container in fume hood

volume (L) time (h) 0.8 0.4 1.6 0.8 2.4 1.2 5.0 2.5 7.2 3.6 9.8 4.9 a) what axis would time be plotted on? b) determine the constant c) determine the relationship between volume and time (type and equation) d) what volume would be collected after 14 h. e) How long would it take to get a volume of 12.5 L

a) x-axis b) 2.0 c) V= 2.0 t and linear/direct d) V= 2.0 (14) = 28 L e) 12.5 = 2.0 t, t = 6.25 h

convert the following numbers from scientific notation to expanded and vis versa 1) 3.08 x 10^4 2) 960 3) 4.75 x 10^-3 4) 0.000484 5) 0.0062 x 10^5

a)30800 b) 9.6 x 10^2 c) 0.00475 d) 4.85 x 10^-4 e) 620

A student doing experimental work finds the density of a liquid to be 0.1679 g/cm3. The known density of the liquid is 0.1733 g/cm3. What is the absolute uncertainty of the student's work? What is the percent of error?

absolute uncertainty= -0.0054 g/cm3 % error= -3.1%

Give four things to keep in mid while heating a test tube half-filled with liquid.

clamp near the top of test tube keep moving the test tube around the flame hold the test tube at a 45 degree angle point the mouth/opening of the test tube away from other people

Y X 0.003 0.05 0.012 0.10 0.048 0.20 0.075 0.25 0.108 0.30 0.192 0.40 What type of relationship is this?

exponential

Y X 5.0 454 10.0 227 15.0 151 20.0 113 25.0 91 30.0 76 what type of relationship is this?

inverse

In an experiment to determine the density of a liquid, a maximum error of 5.00% is permitted. If the true density is 1.44 g/cm3, what are the maximum and minimum values within which a student's answer may fall into the acceptable range?

maximum: 1.51 g/cm3 minimum: 1.37 g/cm3

A zinc slug comes from a science supply company with a stated mass of 5.000 g. A student weighs the slug three times, collecting the following values: 4.891 g, 4.901 g, and 4.890 g. Are the student's values accurate and/or precise?

not accurate but precise

Why should long hair always be secured back during the lab?

to avoid contact with flame and chemicals

Where should binders, book bags, and backpacks be stored during the lab?

under a bench or out of the way