click below
click below
Normal Size Small Size show me how
Chapter 16, 24, 25
Revise Atoms, Elements, Compounds and Periodic Table
Question | Answer |
---|---|
Give the definition for an element and a compound? | An element is a substance that cannot be split into simpler substances by chemical means. A compound is a substance hat is made up of two or more different elements chemically combined together. |
Give the definitions for an atom and a molecule? | An atom is the smallest part of an element. A molecule is two or more elements combined. |
Give the definition for an isotope? | isotopes are atoms of the same element that have different mass numbers. |
Can you give the properties of iron, sulphur and iron sulphide? | Iron: Magnetic, metal, pure elment, shiny silver Sulphur: Non magnetic, non metal, pure element, yellow. Iron Sulphide: Non magnetic, compound, dark grey. |
Can you show how the properties of the Iron Sulphide differ from that of the individual elements of iron and sulphur? | Passing a magnet near the new substance shows that it is not magnetic any more. |
Can you compare the properties of the following compounds to their individual elements – H2O, CO2? | H2O: Hydrogen is a flammable gas and oxygen is essential in combustion, but combined they make a liquid that is not flammable. CO2: Carbon is a solid and part of all life and oxygen is necessary for breathing, combined in CO2 it makes a gas that can kill |
Can you give the definition for atomic number? | The atomic number is the number of Protons in the nucleus. |
Who was the inventor of the periodic table? | Dimitri Mendeleev. |
Can you identify groups 1 to 8 on the periodic table? | The elements in a group have similar physical or chemical characteristic of the outermost electron shells of their atoms |
Can you identify periods 1 to 7 on the periodic table? | The elements of the same period have the same number of shells. Period 1 = 1 shell, Period 2 = 2 shells... |
Can you give the names for group 1, group 2, group 7 and group 8? | 1 Alkali, 2 Alkaline earth metals, 3 Boron group, 4 Carbon group, 5 Nitrogen, 6 oxygen group, 7 Halogens, 8 Noble gasses. |
Can you describe why group 8 elements do not react with other elements? | Their outer shells are full and they do not want to take on or give away any electrons. |
Can you list the symbols for the metallic elements copper, zinc, aluminium, iron, silver and Gold? | Cu, Zn, Al, Fe, Ag, Au. |