Part B: Chemistry Review. Sample Questions: (Answer the following questions on separate sheets of paper where needed.) 16. Read each of the following sentences. Decide if the sente... Part B: Chemistry Review. Sample Questions: (Answer the following questions on separate sheets of paper where needed.) 16. Read each of the following sentences. Decide if the sentence is true or false, and correct sentences that are false. a) The colour of an object is a chemical physical property. b) A chemical physical property of salt is that it forms white crystals in the shape of a cube. c) Non-metals are usually malleable and ductile. d) A compound is an example of a mixture pure substance. e) To determine the density of a sample of material, you must measure the mass and volume of the sample. 17. Label each of the following properties as physical (P) or chemical (C). a) Copper sulphate crystals are blue b) Gold is an excellent conductor of electricity c) Iron rusts when exposed to air and water. d) Salt is soluble in water. e) Calcium reacts with water to produce hydrogen. f) Gasoline burns in an automobile engine. 18. For each of the following pairs of substances, identify a difference in property that would allow you to distinguish between the substances. a) glass and diamond b) salt and sugar c) salt and white sand d) water and rubbing alcohol e) blocks of aluminium and nickel 19. Indicate whether each of the statements that follow is true (T) or false (F). If the statement is false, rewrite it to make it correct. a) A molecule consists of two or more different atoms chemically combined together. b) A molecule may contain thousands of atoms. c) Hydrogen is an alkali metal non-metal. d) Bohr Thomson suggested that atoms are made up of positive and negative parts. e) In a pure substance element, there is only one kind of atom present. f) When molecules atoms combine, they form atoms molecules. g) Metals are usually shiny and poor good conductors of electricity. h) The particle theory usually states that forces of attraction between particles get stronger weaker as the particles move farther apart. i) Helium, rather than hydrogen, is used in blimps because helium is non-flammable while hydrogen is flammable. 20. Decide if each of the following statements is True (T) or False (F). If the statement is false, rewrite it to make it correct. a) Protons and electrons neutrons have almost the same mass. b) The charged particles in an atom are the protons and neutrons electrons. c) Atomic number refers to the number of protons in an atom. d) Every element has a unique number of neutrons protons in its atoms. e) The atom represented by cobalt-60 has 60 27 electrons. f) All metals on the periodic table are solid at room temperature (except mercury). g) In the modern periodic table, elements with similar prop. appear in the same row column. h) Most of the known elements are metals. i) The noble gases are very not reactive elements. j) Elements in the same column have the same number of electrons in their highest orbit. k) Potassium belongs to the group of elements known as halogens alkali metals. l) An alloy of copper and zinc is an example of a heterogeneous homogeneous mixture. 21. A bar of soap measures 10 cm x 5 cm x 3 cm and has a mass of 120g. Calculate the density of the soap. If the density of water is 1g/cm3, will the soap sink or float? Explain. 22. Describe one significant similarity and difference between elements and compounds. 23. Match the following scientists with their contributions to our knowledge of the structure of the atom. 24. Complete the blanks in the following table. 25. Write the elements in question 24 in standard atomic notation 26. Draw Bohr-Rutherford Diagrams for each of the following elements: 27. Observe the following diagrams. Which sample is an example of the following: a. an element. b. a compound. c. a mixture of elements and compounds. d. Which samples are pure substances? Why? 28. Count the number of each atom in a. Ca3(PO4)2 b) C6H12O6 c) Na2SO4 29. Provide one example of a heterogeneous and homogeneous mixture. Read more