(If you cannot get hold of marbles you could try finding small stones or pebbles that are more or less the same size. a physical property that does not depend on the amount of the material. The boiling point of a material is the temperature at which the liquid state of that material turns into a gas. To select greener materials you need to consider the material’s environmental, cost, and performance impacts on your design. What are the disadvantages of a car made of gold? Read the measurement on the thermometer. Coefficient of Area Thermal Expansion Sometimes, just the handles of the cooking pot are made from plastic or wood. If you have time you can also test some other materials such as plastic shopping bags or aluminium foil. What is your hypothesis for this investigation? Once they have located where this is on the diagram, ask them what state water will be at 25°C? Creative Commons Attribution License. When water is boiled over a bigger flame, it will boil at the same temperature, namely 100°C (at lower altitude/at sea level). Why do you think this is so? Can you think of materials that are both strong and flexible? Water boils at 100°C at sea level and at temperatures slightly below that at elevated altitudes. When the person tried to heat the water, the kettle melted as a result of contact with the flame/heat. Learners' graphs should have the following general shape and features: Water can boil at room temperature, inside a vacuum. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. At what temperature does water boil? Suppose we used a Bunsen burner with a bigger flame. Diamond mines require huge amounts of diesel which produce greenhouse gases which build up in the atmosphere. They are mixed but they have not changed into something else. 5 and 6 Matter and Materials. Each of the environmental issues is accompanied by a short video. Bulk density 2. (5) Density Index: The ratio of bulk density of a material to its density is known as its density index and it thus denotes the degree to which its volume is filled up with solid matter. Suggest three possible uses of a material that is a good conductor of heat. Discuss this as a class and write some notes on the lines provided. If you want to create a circuit for a bulb, the material that you use in the circuit to connect the battery to the bulb must have a high electrical conductivity. Note: Once all the ice has melted, the temperature of the water begins to rise. Learners could be encouraged to look for signs of these treatments. in order of increasing tearing strength. In other words, these are the properties which are exhibited by a material when the heat is passed through it. Specific gravity 7. It also contaminates the air for other organisms. It is denoted by ‘S’. Below is a concept map for what we have learnt about the properties of materials. This means there may not be a big difference between the experiments carried out with ethanol and methylated spirits. Table of Contents. The particles in solids are tightly packed into fixed positions, so solids retain their shape. Nitrogen would be a gas at room temperature, because room temperature is higher than the boiling point of nitrogen. 5. ductile: the property of a material that allows it to be drawn out into a wire. What is fracking? 8 Discuss this as a class. However, if you would also like to look at melting point of ice, this second part has been included in the teachers guide later. Which of the above properties would be important if you were choosing a material for making the wires used for distribution of electricity (shown in the next photo)? Not all substances melt at 0°C either. These quantitative properties may be used as a metric by which the benefits of one material versus another can be compared, thereby aiding in materials selection. Porosity 3. Is the ice getting warmer or does the temperature remain constant? You could let the learners cut the paper into strips of 20 x 5 cm each, or you could do this beforehand to save time. The physical properties of a material are greatly influenced by its density. The ‘properties of materials’ chapter from That’s Chemistry! Every process used to produce materials for our benefit has an impact on the environment. Can you see how we can summarise a lot of information onto one page? Why do you think plastics can be 'melted and moulded' with ease? Piezoelectric materials give off a small electrical discharge when deformed. The principle of thermal equilibrium means that the water and ethanol/methanol will be at the same temperature, so the temperature of the water can be substituted for the temperature of the ethanol/methanol. Density of a material or substance is defined as “the mass per unit volume”. The test tube containing the ethanol or methanol should be suspended in a beaker of tap water, and slowly heated. We also mine and produce other metals such as chromium, platinum, as well as coal and iron ore. How would you test how strong a material is? Allow learners to debate this for a short while. Its unit in SI system is watts per meter per K. It is the property of materials which represents that how easily the electricity can be conducted by the material. New properties introduced are boiling point and melting point, and these are introduced using water as example. Have a look at the table that you filled in for part 1 to give you some hints. Here are some guidelines for drawing the graph: Learners should be reminded that the independent variable is the one that was `manipulated'; in this case the total amount of energy added to the water increased with time. This question helps learners to realise that for a fixed amount of water, a fixed amount of energy will be needed to bring it to the boiling point. What are the advantages of having a car made of gold? The concept of making predictions in science investigations is introduced here. Melting occurs at the melting point which is 0°C. This is because the layer of fibers is thicker, so more fibers to cling to each other. They reduce the biodiversity in the area. Tell them to bring the biggest pieces they can find. Form the paper clip into an S-shape and hang it from the hole in the paper. It is represented as the ratio of mass with volume of a material. Is it a straight line? Let's imagine you have different types of paper. At what temperature do you think water will freeze? Flammability and corrosion/oxidation resistance are examples of chemical properties. Physical properties testing expertise includes key physical property characteristics for a wide range of materials. Water is a liquid at 25°C. 1.1 Physical properties of materials (5 hours), Activity: Thinking about materials and their properties, Accessing and recalling information, classifying and sorting, Activity: Advantages versus disadvantages, Accessing and recalling information, comparing, identifying problems and issues, writing. Chapter 2 Physical Properties of Food Materials 25 . If you have time, you can also test different kinds of materials, such as a plastic shopping bag, aluminium foil or plastic wrap. What happened to the temperature of the water when all the ice had melted? Take the average of the number of marbles. http://planetearthherald.com/top-10-environmental-issues/. 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