CHAPTER 26 – DENSITY


The densities of four materials commonly found in planets and moons are given in the table below. Material


Water


Granite Basalt Iron


A solid of mass 12 g has a volume of 1.5 cm3 .


Calculate the density of the material. Hence identify the material as either water, granite, basalt or iron.


3. Final Examination 2019, Question 2 A student was asked to measure the density of a block. The dimensions of the block are shown in the diagram. The mass of the block is 128 g. a. Calculate the volume of the block.


b. Calculate the density of the block. Include the unit for your answer.


Density (g/cm3 1.0 2.8 3.0 8.0


)


4cm


128 g 8cm :Fig. 26.12


c. Fig. 26.13 shows three glasses of water labelled A, B and C. An egg was placed into each glass. The photograph was taken when the eggs were stationary.


AB C 2cm


:Fig. 26.13


Which glass (A, B or C) contains the egg with the greatest density? Give a reason for your answer.


4. Final Examination 2022, Question 13


A student carried out a series of experiments to investigate the properties of sucrose (table sugar). In the first experiment, the student investigated the melting point of sucrose. Two metal cubes of equal volume were placed on a hotplate as shown in the diagram. One was made of zinc (Zn) and the other was made of aluminium (Al). One gram of sucrose was placed on top of each cube and the hotplate was turned on.


The aluminium cube had a smaller mass than the zinc cube. Explain why.


Metal cube (Zn)


Sucrose


Metal cube (AI)


Hot plate


:Fig. 26.14 j Go to page 134 of your Assessment Book to answer more exam-style questions. Elements of Science 261


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