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# Density Worksheet Answers Page 12 2280 g 21.8 g 972 g 766.1 g 5. 4.24 x 10 14 g

Density Worksheet Answers Page 12 2280 g 21.8 g 972 g 766.1 g 5. 4.24 x 10 14 g. Density Worksheet Answers Page 14 11. 3.16 x 10 -15 g/cm 3 12. 0.70 g/cm 3 13. 1500 g (or 1.5 x 10 3 g) 14. 93.24 cm 3 15. V fresh = 5000 cm 3

## Density Worksheet Answers Page 12 2280 g 21.8 g 972 g 766.1 g 5. 4.24 x 10 14 g

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1. Density Worksheet Answers Page 12 2280 g 21.8 g 972 g 766.1 g 5. 4.24 x 1014g

2. Density Worksheet Answers Page 14 11. 3.16 x 10 -15 g/cm3 12. 0.70 g/cm3 13. 1500 g (or 1.5 x 10 3g) 14. 93.24 cm3 15. Vfresh = 5000 cm3 Vsalt = 4850 cm3 so volume left unfilled is 150 cm3

3. Density Worksheet Answers (Bell ringer) Page 14 6. 5.49 cm3 7. 160 cm3 8. 0.43 cm3 9. 14800 cm3 (or 1.48 x 104 cm3) 10. 4000 cm3 (or 4.0 x 103 cm3)

4. Density of Water 1. Most liquids shrink when solidified. 2. Water acts differently than most. Has to do with hydrogen bonding. 3. Water density changes are based on temperature 4. Water has greatest density at 4°C

5. 5. V = m/D volume means density Since ice increases in volume from water liquid form, the density formula indicates will decrease density decreases. Ex: potholes frozen bottled water cracks container.

6. Chemical Properties – the ability of one substance to permanentlychange into a new substance. think “non reversible” or “permanently altered” Ex: melted butter will solidify in refrigerator – PHYSICAL milk can turn sour - CHEMICAL

7. Physical vs. Chemical Properties • Ability to rust • CHEMICAL • 2. The boiling point of a certain alcohol is • 78°C • PHYSICAL • 3. Diamond is very hard • PHYSICAL • 4. Sugar can ferment to alcohol. • CHEMICAL

8. Gallium metal melts in your hand PHYSICAL

9. Chemical Changes (Also known as chemical reactions) – a change that occurs where a new substance is formed that has different properties energy is either given off or entered into the reaction. reactants products “ yields”

10. Reactants – the substances that undergo a chemical change Products – the substance formed as a result of the chemical change Ex: flour + eggs + oil + baking soda cake

11. Ex: Wood burns in air CHEMICAL Ex: A rock is broken into small pieces PHSYICAL

12. Ex: 6H2 + 6H2O + sunlight ==> C6H12O6 + 6O2 Photosynthesis Endothermic reaction – energy stored or taken in Ex: C6 H12 O6 + 6 O2 ==> 6 H2O+ 6 CO2+ energy Cellular respiration in the cell Exothermic reaction – energy released

13. Homework: 2.3 review worksheet Read pgs 53 – 60 do problems 1, 3, 5, 6 on page 60 2 Quizzes on Wednesday one on section 2.3 one on lab Density Lab on Thursday

14. Quiz Topics: physical properties observed measured Chemical properties Physical properties vs. chemical properties Physical changes vs. Chemical changes Density Problems Density, mass, volume relationships Reactants products

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