Properties and Changes of Materials - Answers

The answers for Year Five's Properties and Changes of Materials quiz provide a comprehensive overview of basic scientific concepts related to materials and their interactions. For instance, the three essential elements for combustion are identified as oxygen, fuel, and heat, with carbon dioxide being the typical gas released during the burning process. When classifying materials as fuels or not, paper, wood, petrol, alcohol, and wool are all considered fuels, while glass, copper, and pebbles are not. The quiz also touches on acids, with vinegar being an example, and other acids such as hydrochloric and citric are acceptable answers. The characteristic colour change of indicator paper when introduced to an acid is noted, with red, orange, or yellow being acceptable colours.

Furthermore, the answers delve into the properties of solutions, with solutes being the substances that dissolve, and solvents being the liquids in which they dissolve. The quiz also explores the solubility of various substances in water, and the methods used to separate mixtures, such as evaporation for separating salt from water, and filtration for sand and water. The concept of material hardness is addressed, with steel being the hardest material in the test and chalk the softest. The materials are also classified based on their ability to transmit light, with terms like transparent, translucent, and opaque being used. Additionally, the quiz assesses understanding of thermal and electrical properties of materials, with ceramic being recognized as a good insulator, making it suitable for mugs and teacups, while materials like metal and graphite are identified as electrical conductors.