M D V 1 State the formula for density in words and mathematical symbols Density is mass divided by volume D MV 2 A rock has a mass of 210 grams and occupies a volume of 70 cm3 What is its density ID: 353624
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Slide1
Remember the Triangle
M
D VSlide2
1. State the formula for density in words and mathematical symbols
Density is mass divided by volume.
D = M/VSlide3
2
. A rock has a mass of 210 grams and occupies a volume of 70 cm3. What is its density?
D = M/V = 210g/70 cm3
D = 3 g/cm3Slide4
3. An unknown liquid occupies a volume of 5 mL and has a mass of 40 grams. Find its density:
D = M/V
= 40g / 5 mLD = 8 g/mLSlide5
4. Define the following words:
MASS = the amount of matter in a substance
VOLUME = how much space an object takes upSlide6
5. How does the volume occupied by a cubic centimeter (cm3) compare with the volume occupied by a milliliter (mL)
The volume is the same (cm3 is just measured for solids and mL is measured for liquids)Slide7
6. A rectangular solid of unknown density is 5 m long, 2 m high and 4 m wide. The mass of this solid is 300 grams. Calculate the density:
D = ?
M = 300 gV = 5 x 4 x 2 = 40 m3
= 300g / 40 m3D = 7.5 g/m3Slide8
7. A rock occupies a volume of 20 cm3 and has a mass of 54 grams. Find the density of the rock:
D = ?
M = 54 gV = 20 cm3 = 54g / 20 cm3
D = 2.7 g/cm3Slide9
8. A rock has a density of 4 g/mL and a mass of 16 grams. What is the volume this rock occupies?
D = 4 g/mL
M = 16 gV = ?V = M/D
= 16 g / 4 g/mLV = 4 mLSlide10
9. An unknown substance from planet X has a density of 10 g/
mL. It occupies a volume of 80 mL.
What is the mass?D = 10 g/mLM = ?
V = 80 mLM = D x V = 10 g/mL x 80 mL
M = 800 gSlide11
10. Water has a density of 1 g/mL and ocean water has a density of 1.025 g/
mL. Why?
Ocean water has salt in it and salt is more dense than waterSlide12
11. A cube made of an unknown material has a height of 9 cm. The mass of this cube is 3,645 g. Calculate the density.
D = ?
M = 3645 gV = 9x9x9 = 729 cm3 = 3645g / 729 cm3
D = 5 g/cm3Slide13
12. Beaker
STYROFOAM
BALSA WOODICEWATERBONEGOLDSlide14
13. What is the volume of the rock?
V= 30 ml – 20 ml
= 10 mLSlide15
13. What is the density of the rock?
D = ?
M = 23 gramsV = 10 mL
D = 2.3 g/mLSlide16
14. What is the density of object A?
D = ?
M = 5 gV = 5 cm3 = 5g / 5 cm3
D = 1 g/cm3
FLOATSlide17
15. What is the density of object B?
D = ?
M = 10 gV = 14 cm3 = 10g / 14 cm3
D = 0.7 g/cm3
FLOATSlide18
16. What is the density of object B?
D = ?
M = 23 gV = 24 cm3 = 23g / 24 cm3
D = 0.958 g/cm3
FLOATSlide19
17. An object with a mass of 24g and a volume of 32 mL is most like what substance?
D = ?
M = 24 gV = 32 mL = 24g / 32 mL
D = 0.75 g/mL
WOODSlide20
18. What is the only object in the table that would sink in corn syrup?
CopperSlide21
19. What is the mass of 100 mL of corn oil?
D = 0.92 g/cm3
M = ?V = 100 mL M = D x V
= 0.92 g/cm3 x 100 mL M = 92 g
Slide22
20. What is the volume of 35g of copper?
D = 8.80 g/cm3
M = 35gV = ? V = M/D
= 35g / 8.80 g/cm3 V = 3.977 cm3
Slide23
Density Practice
20 points total
Record score on top pageSlide24
Density Table Contest
With your table, create one density problem
Tables will have 2 minutes to answer the questions at each tableWrite final question & table number on whiteboardRULES:
Must have numbers less that 1000Must include units in questionMust provide teacher with the correct answerSlide25
Learning Goal: Density
4 – I can find and compare the density of different substances
3 – I can compare the density of different substances2 – I know the equation1 – I need to reviewSlide26
TOPIC: pH
EQ: What does pH tell us about different substances?Slide27
pH – a measurement of how acidic or basic a substance is (and the
rxn with water)Slide28
Applications with pH
Skin levels
(more acidic) (lotions, soaps, creams, face wash…)Plant growthCalcium Deposits – lime away, use an acid
Teeth – acids break down enamel yellow teethPool CareSlide29
Indicators to find pH
Slide30
pH Levels? A property to help us better understand a substance