Science

• the sun is the source of energy on earth
• Periodic table : The collection of all the elements, arranged from smallest to largest.
• What is the Periodic Table?

  A collection of all the elements, arranged from smallest to largest.
• What is a metal?

  A group of elements with similar properties on the left-hand side of the periodic table.
• What is a non-metal?

  A group of elements with similar properties on the right-hand side of the periodic table.
• What is a metalloid?

  Elements that have properties similar in common with both metals and non-metals.
• What is a physical property?

  The property of a material that you can observe or measure.
• What is a chemical property?

  How a substance behaves when it is reacted with other substances.
• What does malleable mean?

  Can be hammered into shape.
• What does ductile mean?

  Can be pulled to make wires.
• What does sonorous mean?

  Makes a ringing sound when hit.
• What does brittle mean?

  Something that breaks easily.
• What is a group in the context of the Periodic Table?

  A vertical column on the Periodic Table with elements having similar properties.
• What is density?

  How much mass there is of a certain material in a certain volume.
• What is a period in the context of the Periodic Table?

  A horizontal row on the Periodic Table.
• What is Group 1 known for?

  The group on the most left-hand side of the periodic table.
• What does reactive mean in chemistry?

  How quickly a substance reacts in a chemical reaction.
• What is Group 7 known as?

  Halogen.
• What is a displacement reaction?

  A reaction where a more reactive metal displaces a less reactive metal from its compound.
• What is Group 0 known for?

  Noble gases.
• What does unreactive mean?

  Substances that do not take part in many (or any) reactions.
• Who is Dmitri Mendeleev?

  A Russian scientist who published the first Periodic Table in 1865.
• What are the properties of metals?

  • Good conductor of electricity and heat
  • Shiny
  • High density
  • Malleable and ductile
  • Sonorous
• What are the properties of non-metals?

  • Poor conductor of electricity and heat
  • Dull
  • Low density
  • Brittle
  • Not sonorous
• What are the important groups of the Periodic Table?

  • Group 0: Noble gases (very unreactive)
  • Group 1: Alkali metals (reactivity increases down the group)
  • Group 7: Halogens (reactivity increases up the group)
• What happens in a displacement reaction with chlorine and potassium bromide?

  Chlorine displaces potassium from potassium bromide to form potassium chloride and bromine.
• What is a mixture?

  Something made up of substances that are not chemically joined together.
• What is a pure substance?

  Something made up of just one substance, with no other substance mixed in.
• What is an impure substance?

  Something which isn't pure; it has different substances mixed in.
• What is a solution?

  A mixture of a liquid with a dissolved solid or gas.
• What does it mean to dissolve?

  The mixing of a solute with a solvent.
• What is a solvent?

  The liquid in which a solid or gas dissolves.
• What is a solute?

  A solid or gas that dissolves into a liquid.
• What is a saturated solution?

  A solution in which no more particles can dissolve.
• What is solubility?

  How easily a solute will dissolve into a solvent.
• What does soluble mean?

  A substance that dissolves.
• What does insoluble mean?

  A substance that doesn't dissolve.
• What is filtration?

  A way of separating insoluble solids that are mixed with a liquid using filter paper.
• What is filtrate?

  The name of the liquid that collects after a mixture has been passed through filter paper.
• What is residue?

  The name of the solid that doesn't pass through filter paper during filtration.