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**Bell Ringer 10/1/10 - minutes**

An object has a mass of 30 kg and a volume of 5 liters. What is its density? An object has a volume of 11 mL and a mass of 419 g. What is its density? A rock has a density of 20.0 g/cm3. What would the volume of 340 g of this rock be? Watch sig figs, units, & circle answers! A rock has a density of g/cm3. Jesse fills a graduated cylinder to a volume of 25.0 ml. He drops a sample of the rock into the g.c. and the water level rises to 29.5 ml. What is the mass of the sample? Show all work, round to the correct number of significant figures, and circle your answer. Give 3 units for volume. Give 3 units for mass. Give 3 units for density. A stack of nickels has a density of 8.6 g/cm3 and a volume of 7.5 cm3. What is the mass of the nickels? A kiwi has a mass of g and a density of 0.95 g/cm3. What’s it’s volume? A 5.0 kg object has a volume of 3.0 liters. What’s its density? An object with a density of 5.0 g/cm3 has a mass of 75.0 g. What is the object’s volume? A block has dimensions 5.0 cm by 3.0 cm by 2.0 cm and a mass of 75.0 g. What is it’s density?

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Today you are going to… turn in syllabus look over all of our ocean questions do a couple practice problems complete the Earth as a System Reading Guide So you can… better appreciate the size/scale of Earth identify the parts of the Earth system & how they interact convert from km to mi You’ll know you’ve got it when you can answer the questions on the reading guide

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**Bell Ringer 9/30/13 1 km = _____ m What is volume? Units?**

What is mass? Units? What is density? Units? W5SAYWoS

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**Mass, Volume, and/or Density**

Define mass in your own words. Define volume in your own words. Define density in your own words. Fundamental or derived units? What changes when you drink the pop out of a can? What changes when you crush the can? What changes when you cut an ice cube in half? Compare a Styrofoam peanut and a grain of sand.

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**Golf Ball in Graduated Cylinder**

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Density! What is it?

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Pass Around Bottles Hg & H2O

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**Density Density is the ratio of an object’s mass to its volume.**

Density = mass/volume Units of g/ml, kg/L, g/cm3, lb/gal, lb/ft3 1 g/cm3 = 1000 kg/m3

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Density A pure substance always has about the same density, no matter what size it is. (statue of liberty example)

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**The composition was pure copper from 1793 to 1837.**

From 1837 to 1857, the cent was made of bronze (95 percent copper, and five percent tin and zinc). From 1857, the cent was 88 percent copper and 12 percent nickel, giving the coin a whitish appearance. The cent was again bronze (95 percent copper, and five percent tin and zinc) from 1864 to (Note: In 1943, the coin's composition was changed to zinc-coated steel. This change was only for the year 1943 and was due to the critical use of copper for the war effort.) In 1962, the cent's tin content, which was quite small, was removed. That made the metal composition of the cent 95 percent copper and 5 percent zinc. The alloy remained 95 percent copper and 5 percent zinc until 1982, when the composition was changed to 97.5 percent zinc and 2.5 percent copper (copper-plated zinc). Cents of both compositions appeared in that year.

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**A pure substance always has the same density!**

The density is the same no matter how much or little of it you have. Metal Density g/cm3 Aluminum 2.7 Brass 8.4 – 8.7 Copper 8.9 Gold 19.3 Iron 7.9 Lead 11.3 Nickel 8.8 Platinum 21.4 Silver 10.5 Steel 7.5 – 8.0 Tin 7.3 Titanium 4.5 Zinc 7.1

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Bell Work 9/29 – 5 min If you increased the mass of an object while keeping it’s volume constant, what would happen to it’s density? If you increased the volume of an object while keeping it’s mass constant, what would happen to it’s density? What does inverse mean?

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**As you pass around these objects, put them in order of least to most dense.**

A. shiniest block B. other silver colored block C. yellow block D. golf ball E. marble F. mouse ball G. gray cylinder of zinc

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**Density, Floating, & Sinking**

If it’s more dense than a liquid, it’ll __________ in it. If it’s less dense than a liquid, it’ll __________ in it. Orbits, ping pong ball, golf ball Something with the same density as a liquid will ______. Cannonball in mercury

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Sink n Float Stuff Golf balls Metal sphere ball in rocks changes!

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**Review Anticipatory Set**

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**Now we’ll calculate the density of the objects! **

For which objects did it seem extremely easy to compare the density? To measure the volume of regularly shaped objects (cubes & rectangles) we measure the sides. A. shiniest cube B. other silver colored cube C. yellow cube

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Bell Ringer 10/2/12 Put your homework upsidedown (facing me) on your desk. 55.0 liters of a liquid has a mass of 41 kg. What is it’s density? Would it float in water? A rock has a density of 20.0 g/cm3. What would the volume of 340 g of this rock be? What is the volume of a 2 cm x 3 cm x 5 cm rectangle? When you finish, work on the back of your density worksheet.

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Today you are going to… review density hw & finish the back So you can… solve density problems & complete tomorrow’s lab recognize how problems are graded You’ll know you’ve got it when you can answer the questions on the back of the worksheet

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**3. A 58. 00 mL sample of mercury has a mass of 784. 74 g**

3. A mL sample of mercury has a mass of g. What is its density?

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**5. Pure gold has a density of 19. 32 g/cm3**

5. Pure gold has a density of g/cm3. How large would a piece of gold be if it had a mass of g?

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**6. A 200 cm3 sample of silver has a density of 10. 5 g/cm3**

6. A 200 cm3 sample of silver has a density of 10.5 g/cm What is it’s mass?

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Like # 12: Josh notes that 40.0 cm3 of a certain metal has a mass of g. What would the mass of 295 cm3 be?

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Object Mass (g) Volume (cm3) Density Shiniest cube Other cube Yellow cube Golf ball Marble Mouse ball Zinc cylinder Silverish wire

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**The density of gold is 19. 3 g/cm3**

The density of gold is 19.3 g/cm3. What would the volume of 1 oz of gold be? (1 oz = 28.3 g)

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**Good tutors Good learners**

Explain how and why, don’t just do the problem Ask questions to help lead to understanding Don’t give up! Good learners Ask questions when they don’t understand

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Calculating Density First, you must be able to identify your variables. 16.0 g 25 g/mL 0.56 kg/L 85 cm3 250 L 35 kg 20 mL 6.023 g/cm3 85 m3

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Bell Work 9/27 – 5 minutes The sides of a rectangle measure 0.5 cm x 1.0 cm x 1.5 cm, and it has a mass of 2.25 g. What is it’s density? Your trying to find the density of a 30.0 g irregularly shaped object. You put some water in a graduated cylinder and measure the water level to be 20.0 mL. You drop the object in, and the water level rises to 25.0 mL. What’s the object’s density?

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**Density Triangle - Cover the letter of the variable you want to find and you will have the formula! **

For example, if you cover the "V", you will see the formula for volume is mass/density. This can be done with any formula like this!

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**25 mL (milliliters) of liquid has a mass of 50 g (grams)**

25 mL (milliliters) of liquid has a mass of 50 g (grams). What is the liquid’s density?

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**25 mL (milliliters) of liquid has a mass of 50 g (grams)**

25 mL (milliliters) of liquid has a mass of 50 g (grams). What is the liquid’s density? D = M = 50 g = 2 g/ml V ml

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**An object has a mass of 30 kg and a density of 5 g/mL**

An object has a mass of 30 kg and a density of 5 g/mL. What is its volume?

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**An object has a density of 10. 0 g/mL and a mass of 419 g**

An object has a density of 10.0 g/mL and a mass of 419 g. What is its volume?

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Bell Ringer A rock has a density of g/cm3. Jesse fills a graduated cylinder to a volume of 25.0 ml. He drops a sample of the rock into the g.c. and the water level rises to 29.5 ml. What is the mass of the sample? Show all work, round to the correct number of significant figures, and circle your answer.

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Archimedes' principle Archimedes' principle: When a body is fully or partly immersed in a liquid, that body experiences an upward force (the buoyant force) equal to the weight of the displaced liquid. The displaced liquid is that volume of liquid equal to the volume of the body below the water surface. Density of Penny 3.11 grams [pre 1982] 2.50 grams [post 1982] Density of nail = 8.04 g/ml Density of alcohol = g/ml

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**Bell Work 10/4 – 6 minutes (Include units & tell if each will sink or float)**

1. A random solid has a mass of 24 g and a volume of 35 mL. What is its density? 2. An object has a mass of 18 kg and a volume of 3 liters. What is its density? 3. An object has a volume of 10.0 cm3 and a mass of 73 g. What is its density? 4. If 60 mL of liquid has a density of 0.70 g/mL, what is its mass? 5. An object has a mass of 36 g and a density of 2.5 ml/g. What is its volume?

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**Density Labs Show all of your work for all 4 objects (16 pts)**

Finding volume, equation, equation with substitution, answer with units 4 points for behavior Stay in own group Only take one item at a time Clean up

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**Find density of cylinder**

Show setup/procedure for finding density

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**Density Density of water (@ 4oC) = 1.000 g/ml = 1.000 kg/L**

Gram was defined as “mass of 1 mL of water” More dense than water sinks Less dense than water floats Same density can be suspended anywhere in it something with the same density as water will level out in the middle. (show examples of each)

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Mass, Volume, Density? 1. What changes when you drink the pop out of a can? 2. What changes when you crush the can? 3. Define mass in your own words. 4. Define volume in your own words. 5. What has more volume, a Styrofoam peanut or a marble?

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**25 mL (milliliters) of liquid has a mass of 50 g (grams)**

25 mL (milliliters) of liquid has a mass of 50 g (grams). What is the liquid’s density?

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**25 mL (milliliters) of liquid has a mass of 50 g (grams)**

25 mL (milliliters) of liquid has a mass of 50 g (grams). What is the liquid’s density? D = M = 50 g = 2 g/ml V ml

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**Grading of Problems Identify variables – units are clues!**

Write formula Substitution Circle answer with correct sig figs & units

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Density Triangle - For whatever you're trying to solve for, cover that letter with your finger and you will have the formula! For example, if you cover the "V", you will see the formula for volume is mass/density. (review how to find it)

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**Density Problems (Include units, correct # of sig figs, & tell if each will sink or float in water)**

A random solid has a mass of 24.0 g and a volume of 35 cm3. What is its density? A liquid has a mass of 18 kg and a volume of 3.00 liters. What is its density?

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**Density Problems (Include units, correct # of sig figs, & tell if each will sink or float in water)**

A liquid has a volume of 10.0 mL and a mass of 7.30 g. What would the mass of 97 mL of the liquid be?

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Bell Work 10/5 Sam measures the mass of a metal ball on a balance and it reads g. She drops the metal ball into a graduated cylinder and the water level goes from 25.5 mL to 28.8 mL. What would the volume of a of 5.5 kg metal ball be?

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**If 60 mL of liquid has a density of 0.70 g/mL, what is its mass?**

Density Problems (Include units, correct # of sig figs, & tell if each will sink or float in water) If 60 mL of liquid has a density of 0.70 g/mL, what is its mass? An object has a mass of 36 g and a density of 2.8 ml/g. What is its volume?

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Density Lab Problem Dan masses a metal cylinder and the balance reads g. He drops it into a graduated cylinder with some water in it, and the water level goes from 34.5 mL to 39.0 mL. What is the density of the metal cylinder?

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**Density Lab Problem Too**

Abbey masses a wooden block and the balance reads g. She measures the sides & finds the block to be 3.0 cm by 4.0 cm by 6.0 cm. What is the density of the wooden block?

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**4. If 60 mL of liquid has a density of 0.70 g/mL, what is its mass? **

Density Problems (Include units, correct # of sig figs, & tell if each will sink or float in water) 1. A random solid has a mass of 24.0 g and a volume of 35 cm3. What is its density? 2. A liquid has a mass of 18 kg and a volume of 3.00 liters. What is its density? 3. A liquid has a volume of 10.0 mL and a mass of 7.30 g. What would the mass of 97 mL of the liquid be? 4. If 60 mL of liquid has a density of 0.70 g/mL, what is its mass? 5. An object has a mass of 36 g and a density of 2.8 ml/g. What is its volume?

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**Density Problems (Include units, correct # of sig figs, & tell if each will sink or float in water)**

1. A random solid has a mass of 24.0 g and a volume of 35 cm3. What is its density? g/ cm3 Float 2. An object has a mass of 18 kg and a volume of 3.00 liters. What is its density? 6.0 g/L Sink 3. A liquid has a volume of 10.0 mL and a mass of 7.30 g. What would the mass of 97 mL of the liquid be? 0.730 g/mL g Float 4. If 60 mL of liquid has a density of 0.70 g/mL, what is its mass? 4 g Float 5. An object has a mass of 36 g and a density of 2.8 ml/g. What is its volume? mL Sink

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STOP

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**The Saltiest Sea – The Dead Sea**

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**Are nickels made of nickel?**

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**Are nickels made of nickel?**

The U.S. first struck 5¢ nickel coins in All nickels from that date to the present except for the famous "war nickels" (mid-1942 to 1945) are made of the same metal, an alloy of 75% copper and 25% nickel. "War nickels" were made of 35% silver, 56% copper, and 9% manganese because nickel was needed for the war effort. These coins are distinguished by the extra large mint mark over the dome of Monticello. They have been worth up to 90¢ for their silver content. In August 2009, the value of the metal in the standard nickel was about 5 cents, due to the rising costs of copper and nickel.

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Happy Birthday Jeff!

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Chapter 3 CHM 130 GCC Chemistry.

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