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Grade Nine Science

Grade Nine Science. Properties of Matter II. Day 2: Handouts to Review. Matter concept map. Blackline master 1.2 “Properties of Matter”. Identify the property that best fits. 1.5 Density. Which is heavier: a 12 inch bar of gold or a pillow full of feathers?

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Grade Nine Science

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  1. Grade Nine Science Properties of Matter II

  2. Day 2: Handouts to Review Matter concept map. Blackline master 1.2 “Properties of Matter”. Identify the property that best fits.

  3. 1.5 Density • Which is heavier: a 12 inch bar of gold or a pillow full of feathers? • A 12 inch bar of gold weighs more than a pillow full of feathers even though the pillow takes up more space. Why? • Gold is more dense. It has more matter per unit volume.

  4. 1.5 Density • Density is the amount of matter per unit volume of that matter. • Density(D) = Mass(m) / Volume(V) • If you know any two of the three variables (D,m, or V), you can solve for the third. m = D x V V = m / D

  5. Sample density question #1 If a rock has a mass of 49 g and occupies a volume of 7 cm3, what is the density? D = m / V = 49 g / 7 cm3 = 7.0 g/ cm3

  6. Solve these sample density questions • An object has a mass of 250 g and occupies a volume of 14.5 cm3, what is the density? • A piece of wood occupies a volume of 46 cm3 and it has a mass of 100 g. What is the density of the wood? • An unknown metal has a density of 2.6 g/cm3 and a mass of 15 g. How much volume does this piece of metal occupy? • A sample of a particular liquid has a density of 6.85 kg/L and it occupies a volume of 3.4 L. How much does this particular sample weigh?

  7. Answer to question #1 D = m / V = 250 g / 14.5 cm3 = 17.24 g/ cm3

  8. Answer to question #2 D = m / V = 100g / 46 cm3 = 2.17 g/ cm3

  9. Answer to question #3 D = m / V V = m / D = 15 g / 2.6 g/cm3 = 5.77 cm3

  10. Answer to question #4 D = m / V M = D x V = 6.85 kg/L x 3.4 L = 23.29 kg ** Note that volume can be expressed as cm3, m3, ml or even L.

  11. Approximate Densities of Some Common Materials

  12. Water is more dense than ice! • Why is this so important? • It means that ice floats in water instead of sinking. Think of the poor fish if this was the not the case. • Why is ice less dense than water? • When water freezes, it expands which means that the same mass of water is spread over a greater volume.

  13. Homework • Answer questions 2,3,4 on page 25 of the text.

  14. Day 3: Lab #1 Identifying Substances

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