Chemistry_Grade_10-12 (1).pdf

A potassium nitrate b sodium iodide c barium sulphate

Info icon This preview shows pages 26–28. Sign up to view the full content.

View Full Document Right Arrow Icon
(a) potassium nitrate (b) sodium iodide (c) barium sulphate (d) nitrogen dioxide (e) sodium monosulphate 4. Refer to the diagram below, showing sodium chloride and water, and then answer the questions that follow. (a) What is the chemical formula for water? (b) What is the chemical formula for sodium chloride? (c) Label the water and sodium chloride in the diagram. (d) Which of the following statements most accurately describes the picture? i. The picture shows a mixture of an element and a compound ii. The picture shows a mixture of two compounds iii. The picture shows two compounds that have been chemically bonded to each other 5. What is the formula of this molecule? H C C O H H H H H A C 6 H 2 O B C 2 H 6 O C 2C6HO D 2 CH 6 O 12
Image of page 26

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
CHAPTER 1. CLASSIFICATION OF MATTER - GRADE 10 1.4 1.4 Metals, Semi-metals and Non-metals The elements in the Periodic Table can also be divided according to whether they are metals , semi-metals or non-metals . On the right hand side of the Periodic Table is a dark ’zigzag’ line. This line separates all the elements that are metals from those that are non-metals. Metals are found on the left of the line, and non-metals are those on the right. Metals, semi-metals and non-metals all have their own specific properties. 1.4.1 Metals Examples of metals include copper (Cu), zinc (Zn), gold (Au) and silver (Ag). On the Periodic Table, the metals are on the left of the zig-zag line. There are a large number of elements that are metals. The following are some of the properties of metals: Thermal conductors Metals are good conductors of heat and are therefore used in cooking utensils such as pots and pans. Electrical conductors Metals are good conductors of electricity, and are therefore used in electrical conducting wires. Shiny metallic lustre Metals have a characteristic shiny appearance and are often used to make jewellery. Malleable This means that they can be bent into shape without breaking. Ductile Metals can stretched into thin wires such as copper, which can then be used to conduct electricity. Melting point Metals usually have a high melting point and can therefore be used to make cooking pots and other equipment that needs to become very hot, without being damaged. You can see how the properties of metals make them very useful in certain applications. Activity :: Group Work : Looking at metals 1. Collect a number of metal items from your home or school. Some examples are listed below: hammer electrical wiring cooking pots jewellery burglar bars coins 2. In groups of 3-4, combine your collection of metal objects. 3. What is the function of each of these objects? 4. Discuss why you think metal was used to make each object. You should consider the properties of metals when you answer this question.
Image of page 27
Image of page 28
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern