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Density (1) Name _____________________________________________
Date ____________ Period ____________
SHOW ALL WORK. INCLUDE UNITS IN YOUR ANSWER.
1) Formula for density: solve for each variable in terms of the other variables.
a) D =
b) M =
c) V =
2) A piece of aluminum has a mass of 5.4 grams and a volume of 2.00 mL. What is its density?
3) The density of oil is about 0.92 g/mL. What is the mass of 35.3 mL of oil?
4) Helium has a density of 0.18 g/L. If you put 3.0 grams of helium in a balloon, what will its volume be?
5) A piece of wood with a density of 0.40 g/cm3 has a mass of 2,500 grams. What is its volume?
6) A balloon with a volume of 4.3 L is filled with air, which has a density of about 1.3 g/L. What is the mass of the air in the balloon?
7) An unknown piece of metal has a mass of 34.2 grams and a volume of 3.0 cm3. What is its density?
Density (2) Name ____________________________________
Date ___________ Period __________
1) 25 cm3 = ______ mL
2) Density of water = ___________ (include units)
3) 2.5 grams of water = _________ mL of water.
4) 9.5 mL of water = __________ grams of water.
5) A block of wood has a mass of 50.0 grams. It is 6.00 cm x 5.00 cm x 3.00 cm. Find its density. Show work.
6) Which of the following would float in water? (Determine the density first.)
a) object with volume of 23 cm3 and mass of 21 g
b) object with volume of 150 mL, mass of 40. g
c) object with mass of 62 g, volume of 23 cm3
7) Given that gasolines density is 0.67 g/cm3, which of the above would float in gasoline?
8) 300.0 mL of a liquid is placed in a graduated cylinder which has a mass of 48.3 grams when empty and a mass of 265.4 grams with the liquid. Find the liquids density.
9) Gold's density is 19.3 g/cm3. What is the mass of a real gold bar, which measures 4.5 cm x 9.2 cm x 17.8 cm?
10) Take your answer from above and convert it to pounds given that 1 lb = 454 grams. How heavy is a gold bar in pounds? (Keep this in mind the next time you watch a movie where people are carrying around a sack full of gold bars.)
11) Given gold's density of 19.3 g/cm3, what is the volume of 1.00 kg of gold?
12) You need to find the density of a piece of metal. It has a mass of 27.04 grams. You drop it into a graduated cylinder with some water it in; the volume of water goes from 15.7 mL to 25.8 mL when the piece of metal is submerged. What is the density of the metal?
Name ___________________________________
HEAT & TEMPERATURE NOTES
HEAT: _____________________________________________________________________ _________________________________________________________________________
TEMPERATURE: _____________________________________________________________ _________________________________________________________________________
* How could two beakers of water have the same temperature but different amounts of heat?
ENDOTHERMIC: ______________________________________________________________ _________________________________________________________________________
Examples:
EXOTHERMIC: ______________________________________________________________ _________________________________________________________________________
Examples:
Water In Fahrenheit (OF)In Celsius (OC)In Kelvins (K)Freezing Pt.Boiling Pt.
Absolute zero is ______________________________________________________________ _________________________________________________________________________
At absolute zero, atoms and molecules _____________________________________________ _________________________________________________________________________
Draw a Celsius thermometer and a Kelvin thermometer side by side:
To go from OC to K, __________________. To go from K( OC, ______________.
Heat and Temperature Worksheet Name ____________________________________
Unit 2 Academic Chemistry Date ___________ Period __________
Answer the following questions:
1) The temperature scale which begins with "0" at absolute zero, the coldest temperature: _______________
2) The temperature scale which begins with "0" at water's freezing point: : _______________
3) Unit of energy equal to the energy needed to increase 1 g of water by 1 OC: _______________
4) Metric or SI unit of energy: _______________
5) The average kinetic energy of the particles of a substance is its: _______________
6) The total kinetic energy of the particles of a substance is its: _______________
7) 10 mL of water = ______ grams of water.
8) The specific heat of water = _______ J/gOC
Convert the following temperatures:
9) 349 K = _________ OC 11) -273 OC = _________ K 13) 100 K = _________ OC
10) -50 OC = _________ K 12) 273 OC = _________ K 14) 0 K = _________ OC
Do the following calculations to the correct number of significant figures:
15) Find the change in heat (q) in joules for a glass containing 100.0 g of water is heated from 25 OC to 47 OC.
16) Find (q) for a glass containing 25.3 mL of water whose temperature changes from 89.2 OC to 26.8 OC.
Find (q) for a drop of water that is heated from waters freezing point to its boiling point. A drop of water is about 1/20 mL.
17) A tub containing 75 liters of hot bath water cools from 60.0 OC to 25.0 OC. Find q. (Convert L to mL first!)
15 mL of water is heated from 280. K to 322 K. Find the total change in heat energy (q) in joules.
Heat and TemperatureMore Problems
400.0 Joules of energy are added to 1.00 grams of water at a temperature of 275 K.
What change in temperature would occur?
What is the water's final temp.?
400.0 Joules of energy are added to 50.0 mL of water at a temperature of 275 K.
What change in temperature would occur?
What is the water's final temp.?
The specific heat capacity (Cp) of iron is 0.444 J/gOC. Find the (q) for 25.00 g of iron being heated from 0.0 OC to
50.0 OC.
22) A 452.4 gram piece of iron is heated from 290. K to 450. K. How many joules of energy does this require?
23) You touch a 0.040 g piece of iron at 500.0 OC. It cools to about 50.0 OC from contact with your body. Find the q for the iron (which is the amount of energy transferred to your body.)
24) It takes 353.4 joules of energy to heat a 22.0 gram piece of metal from 249 K to 295 K. Find the specific heat capacity (Cp) of the metal.
25) You touch the piece of hot iron from question #23 above. If, about 1 gram of water in your skin gets absorbs the heat energy given off by the iron, and your skin starts off at 37 OC, what temperature will the water in your skin heat up to?
Practice Test Unit 2 Academic Chem Name ________________________________
1) Define heat:
2) Identify the following as endothermic or exothermic:
a) Touching a hot object (for your finger): ___________ d) Breaking a pencil (for you): ___________
b) Touching a piece of ice (for your finger): ___________ e) Freezing water (for the water): ___________
c) Touching a piece of ice (for the ice): ___________ f) Freezing water (for your fridge): ___________
3) What is absolute zero?
4) Give the following temperatures:
Freezing point of water in OC: ___________ Absolute zero in kelvins: ________
Boiling point of water in Kelvins: ___________ Absolute zero in Celsius: ________
45 OC = ___________ K 200 K = ___________ OC
5) When you put a hot piece of metal with a mass of 33.5 grams into cool water, it cools from
385. OC to 37. OC and loses 3290 Joules in the process. What is the specific heat of the metal?
6) Suppose that your pool contains 150,000 Liters of water, and you want to heat the pool up by 10.0 OC. How much energy will you need (in joules) to heat the water?
7) You decide to heat up your pool by heating bricks on your gas grill and throwing the hot bricks into the pool. You heat the bricks up to about 350 0C, and when they hit the pool water, they cool down to about 30 0C. The heat capacity of brick is 2.0 J/g0C. You need 6.3 x 109 J to heat up the pool by the desired amount. What mass of hot bricks do you need?
8) What is the density of a 125 gram piece of plastic with a volume of 58 mL? Does it float in water?
9) What is the mass of a 32.2 cm x 25.4 cm x 11.2 cm block of wood with a density of 0.540 g/cm3?
10) You put a 12.5 gram piece of metal into a graduated cylinder. The water level in the cylinder goes from 50.0 mL to 53.2 mL when you put the metal in. Find the density of the metal. Would it float in liquid mercury, which has a density of 13.6 g/mL?
Extra Practice: Unit 2 Name ____________________________________
1) Find the density of a block of metal that measures 3.2 cm x 2.3 cm x 4.5 cm and has a mass of 89.42 grams.
2) For the metal from question #1, lets say that you know that its either zinc, magnesium, aluminum, or nickel. Using your periodic table, find out which one it is.
3) Find the mass of air in a balloon if its volume is 4.5 L. The density of air is 1.3 g/L.
4) Find the volume of a 2.5 kg piece of lead. Get leads density from your periodic table.
5) Find the amount of heat needed to boil a pot of water that starts off at room temperature (22 oC). The pot contains 1200 mL of water.
6) Whats the heat capacity of a piece of metal if a 300.0 gram piece of it releases 20 000. J of energy when cooling from 250.0 oC to 25.0 oC?
7) THREE-STEP PROBLEM.
You go to the fridge to get a nice, cold glass of soda. But the cupboard is empty, so you have to get a glass from the dishwasher, and it is still hot. You put the cold soda in the warm glass, and of course, it makes your soda warm.
a) Your hot glass from the dishwasher started off at 75.0 oC and cooled to 10.0 oC after you put the soda in it. Your glass had a mass of 464.7 grams. Glass has a heat capacity of 0.25 J/g oC. Find the amount of heat released by the glass (q).
b) Suppose that all of the heat energy from the glass in part (a) went into your soda. Figure out how much the temperature of the soda will change. Your glass held 300.0 mL of soda. Remember, count the soda as if it is water.
c) If your soda started off at 4.0 oC, what temperature was it after being warmed up by the hot glass?
8) Convert 350 K into oC.
9) You put 4 different pots, all with the same mass, on the burners of a stove and heat them equally. The material that the pots are made of, and their heat capacities, are as follows:
Glass: C = 0.25 J/g oC
Copper: C = 0.385 J/g oC
Stainless Steel: 0.11 J/g oC
Aluminum: 0.22 J/g oC
After heating all of the pots for the same amount of time, which one will be the hottest, and why?
Unit 2 Test Review With Answers Name _______________________________________
Academic Chem Date ___________ Pd _____________
Put your answers on a separate sheet of paper.
Define heat.
What temperature scale starts at absolute zero?
What is absolute zero?
Find the volume of a 50.0 g piece of lead. Leads density is 11.4 g/mL.
Which is easier to heat up, lead or water? (Leads Cp = 0.129 J/goC; Waters Cp = 4.18 J/goC)
Find q if 50.3 g of water goes from 37.0 oC to 22.0 oC.
5 mL of water = _____ g of water.
Endo or exo? You pull apart 2 objects that are glued together. (For the objects.)
Check answers! Then do the next set.
Define temperature.
Find the mass of a 2.0 x 3.0 x 5.0 cm piece of aluminum (density = 2.7 g/mL.)
When does an object float?
25 cm3 = ____ mL
Find the Cp of a piece of a 1.2 kg piece of metal that needs 2000. J to heat from 18 oC to 21 oC.
Endo or Exo? Boiling water (for the water).
Endo or Exo? freezing water (for the water).
270. oC = ________ K.
What is the difference between interpolation and extrapolation on a graph?
Find the percent error if you calculate the density of copper to be 7.2 g/mL, but its actually 8.0.
Answers:
The total kinetic energy of the particles in a system.
Kelvins.
The coldest possible temperature, at which all particle motion stops (0 K.)
V = M/D = 50.0 / 11.4 = 4.39 mL
Lead. You need only 0.129 Joules to heat up 1 g of lead by 1 oC, but you need 4.18 Joules to heat up 1 g of water by 1 oC.
Q = M x C x DT = 50.3 g x 4.18 J/goC x 15.0 oC = - 3150 J
5 g (because water s density is 1 g/mL, this means that 1 g = 1 mL of water.)
Endo. You need to put energy in to the objects to pull them apart.
The average KE of the particles in a system.
M = D x V = 2.7 x 30 = 81 grams
When it is less dense than the liquid it s in.
25 mL. By definition, 1 cm3 = 1 mL.
Q = M x C x DT, so& C = q / (M x DT.) First convert 1.2 kg to 1200 grams.
C = 2000. / (1200 x 3.0 ) = 0.56 J/goC
Endo. You have to put heat INTO the water to make it boil.
Exo. You have to take heat OUT of water to freeze it.
270 + 273 = 543 K. (Add 273 to convert to kelvins.)
In terms of a regression line on a graph, interpolation means to estimate a value that is between known data points, and extrapolation means to estimate a value outside of the range of data points.
(8.0 7.2) / 8.0 = 10.% error
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