12/17/2023 0 Comments Chemical changes video for kids![]() No chemical changes took place when you melted the ice. Physical actions, such as changing temperature or pressure, can cause physical changes. You added enough energy to create a phase change from solid to liquid. When you melt an ice cube (H 2O), you have a physical change because you add energy. No chemical bonds were created or broken. Also, since this was a physical change, the molecules in the can are still the same molecules. It wasn't a change in the state of matter because the energy in the can did not change. However, you only changed the shape of the can. When you step on a can and crush it, you have forced a physical change. Chemical changes happen when atomic bonds are broken or created during chemical reactions. Chemical changes happen on a molecular level when you have two or more molecules that interact. Physical changes are usually about physical states of matter. Some changes are obvious, but there are some basic ideas you should know. these physical properties can be measured.It is important to understand the difference between chemical and physical changes. The boiling point is also the temperature at which a gas will condense into a liquid. For example, the boiling point of pure water is 100☌. The melting point is also the temperature at which a liquid will freeze to a solid., or a liquid's boiling point close boiling point The temperature at which a pure substance boils from a liquid into a gas. For example, the melting point of pure water is 0☌. By observing a solid's melting point close melting point The temperature at which a pure substance melts from a solid into a liquid.the object may snap, or if it is flexible close flexible A substance is flexible if you can bend it and it returns to its original shape after the bending force is removed. ![]() If something is brittle close brittle Something which is brittle is easily broken or shattered. By applying force to an object you can observe it's physical properties. ![]() Physical properties can be seen and can usually be measured quite easily in an experiment. I don’t think a plastic frying pan would be very useful! It’s important to pick the right material for a job based on its chemical and physical properties. Whereas normal steel will rust when exposed to air and water.Īnd wood will react with oxygen if heated. Like the stainless steel metal in cutlery, which doesn’t react with food and remains shiny after washing. Sometimes, we choose the right material based on its chemical properties - which describe how reactive it is. Whereas other materials, like the glass bulb of this lamp, are brittle. Metal is a good electrical conductor.īoth the metal and the plastic can be easily shaped into long flexible wires - we say they’re ductile. The electric current can flow through the inner metal part of the wire to light the lamp. And plastic has a lower melting point too.īut plastic is a good electrical insulator, meaning we can touch the outside of electrical plugs and wires without getting an electric shock. Whereas the plastic of the handle doesn’t conduct heat so well, it’s an insulator. Metal is a good conductor of heat, and has a high melting point, making it good to cook with. Physical properties are the basic features of a material that affects how it behaves in different situations. It’s because of the physical properties of the materials. I’m going to find out why we make frying pans out of metal, and why the case around electrical plugs out of plastic, but not the other way round. ![]()
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