| Question | Answer |
|---|---|
| What is the name given to the small particles that all substances are made of | Atoms |
| What is the definition of an atom | An atom is the smallest part of an element that still has the properties of that element |
| What is the definition of an element | An element is a substance which cannot be broken down into simpler substances by chemical means |
| Which non metal element can exist in two form, graphite or diamond | Carbon |
| Which yellow non metal solid element is used in fireworks and matches | Sulfur |
| Which silver metal element is used in the manufacture of ships and skysrapers | Iron |
| Which brown solid metal element is an excellent conductor of electricity | Copper |
| Which yellow solid metal is used in making of jewellery | Gold |
| Which soft silver white metal can easily be cut with a knife | Sodium |
| What is the definition of a compound | A compound is formed when two or more elements combine together chemically |
| What is the definition of a molecule | A molecule is the smallest part of an element or compound that can exist on its own |
| What is the definition of a mixture | A mixture consists of two or more different substances mixed together but not chemically combined |
| In a mixture, does the proportions of each substance in the mixture matter | No |
| Does the proportions of each substance matter in a compound | Yes |
| Is a mixture difficult or easy to separate | Easy |
| Is a compound difficult or easy to separate | Difficult |
| Give two examples of a compound | Water and sodium chloride |
| Give two examples of a mixture | Air and seawater |
| What is a physical change | A reaction in which nothing new is made |
| What is a chemical change | A reaction in which something new is made |
