Download Science Focus 1, 2nd Edition by Greg Rickard and others PDF
By Greg Rickard and others
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Extra resources for Science Focus 1, 2nd Edition
Sample text
A spatula b There is 200 mL of water in this beaker. b beaker c The packet of sugar states that it is 200 g but when you hold it, it feels a lot lighter. d tripod e evaporating basin f Bunsen burner. 3 Recall equipment used in the laboratory by drawing 2D scientific diagrams for the following pieces of equipment: d The thermometer reads that the temperature of the room is 25°C. 9 Identify four observations you could make about: a a glass of tomato juice b an ice cube a a beaker used to boil 200 mL of water c rain b a 50 mL measuring cylinder d grass.
For example, scientists cannot see individual particles of water, but they can observe how water (and ice and steam) behaves. From these observations scientists have developed the particle model to better understand different forms of water and other solids, liquids and gases. 1 Liquid water, solid ice and the water vapour in this man’s breath are all the same substance. Models in science Quick Quiz Scientists often use models to help them understand the world and the way it works. Computer models, for example, are commonly used to simulate weather patterns and to predict the movements of the planets, tides and tsunamis, and the effects of earthquakes.
Gas to liquid The opposite of vaporisation is condensation. Condensation occurs when gas particles lose heat energy and turn into liquid. When you breathe out on a very cold day, the water vapour in your breath (a gas) condenses to form tiny droplets of water that are suspended in air and appear fog-like. A similar thing happens when you breathe on a window. Small water droplets condense on the glass, making it difficult to see your reflection. Unit Sublimation is a much less common change. Sublimation occurs when a solid absorbs heat and changes directly to a gas without melting and going through the liquid phase.