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LOWER FORM KBSM Science Density and Calculation
- 1. Wooden block Float on water. Wooden block is Less dense than water Aluminum blocksink in water. Aluminium block is more dense than water weight
- 2. 1.5 DENSITY • Arrangematerials sequentially based on their density. • Predict whether the materials will float or sink according to their density. • Define the operational definition of density. • Calculate density using the formula (density = mass / volume) and water displacement method. • Explain the phenomena related to density differences in everyday life. • Innovate objects, food or beverage using the concept of density.
- 3. THE FORMULA OFDENSITY density is mass per unit volume of the substance Density Unit = g/cm3 or kg/m3 Density of mercury = 13.6g/cm3 M M D V Every 1 cm3 has 13.6g of mercury.
- 4. EXAMPLE : A stonehas a volume of 10 cm3 and mass of 30 g. Find its density. Density = 30 g / 10cm3 = 3 g/cm3
- 5. EXAMPLE 2: A stonehas a volume of 10 cm3 and mass of 30 g. Find its density. Density Density Density 3 g/cm3 M M D V
- 6. EXAMPLE 3: A stonehas a volume of 100 cm3 and its density is of 3 g/cm3 . Find its mass. M M D V Mass density x volume Mass 3 g/cm3 x 100 cm3 Mass 300 g
- 7. Example 4 Density ofmercury is 13.60 g/cm3 . What is the volume of mercury if the mass of mercury is 12.5g. Volume = mass/density = 12.5 / 13.6 =0.9 cm3
- 8. Example 5 What isdensity of an object X if its volume is 30 cm3 with mass 45g. Density = mass /volume = 45/30 = 1.5 g/cm3
- 9. Example 6 Object Yhas density 12.8 g/cm3 . What is the volume of the object if the mass is 100g. Volume = mass/density = 100 / 12.8 = 7.8cm3
- 10. Example 7 An objecthas density of 8.90g/cm3. The mass of the object is 250g. Calculate the volume of the object. Volume= Mass Density = 250 8.90 = 28.1 cm3
- 11. Example 8 Density ofcopper is 8.92 g/cm3 . A block of copper has volume 100 cm3 . Calculate the mass of the copper. Mass= density * volume = 8.92 * 100 = 892g
- 12. Example 9 Alice hasa stone with mass 60g. The volume of the stone is 25cm3 . What is the density of the stone? Density = Mass / volume = 60 / 25 = 2.4 g/cm3
- 14. Different density ofliquid. 1. Which of the substances has the highest density? 2.Which of the substances has the lowest density? 3. State the substance has higher density than water but lower than Corn syrup.
- 15. 5 cm 10 cm 5cm The mass of the cuboid is 750 g. Calculate the density of the cuboid. Volume of cuboid = 10 *5*5= 250cm3 Density = mass / volume = 750 / 250 = 3 g/cm3
- 16. Wood is less dense than/ has lower density than the water.
- 17. Daniel wanted toknow the density of a stone. The mass of the stone is 65g. 1. Name the method used to determine the volume of stone. 2. State the volume of the stone. 3. Calculate the density of the stone. 1. Water displacement method 2. 180 ml – 150ml = 30ml= 30 cm3 * 1 ml = 1cm3 3. Density = mass/volume = 65 g / 30 cm3 = 2.17 g/cm3
- 18. Based on thediagram, which object has higher density than water? Explain your answer. (2m) • Marble (1m) • It sinks in the water (1m) candle marble
- 19. MATERIAL DENSITY (g/cm3 ) Gold19.30 Lead 11.30 Copper 8.92 Aluminium 2.70 Ice 0.92 Cork 0.24 Mercury 13.60 Seawater 1.03 Pure water 1.00 Petrol 0.80
- 20. Material Density Gold 19.30 Lead11.30 Copper 8.92 LEAD COPPE R GOLD Arrange the density in ascending order.
- 21. 1. Compare thedensity of tap water and salt water. (1m) Salt water has higher density than tap water.
- 22. A plasticine with50g in ball-shaped is sink in the water. KimWing make the same plasticine into bowl-shaped. He observed that the plasticine in bowl-shaped float on water. Explain why. (3m)
- 23. 1.Plasticine in ball-shapedhas higher density than the bowl- shaped. 2.Bowl-shaped plasticine has lesser density than ball-shaped because it has larger volume than the ball-shaped. 3.The density of bowl-shaped decreases when the volume is increase. Density
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