click below
click below
Normal Size Small Size show me how
PS 05b Changes in Ma
8th Grade 2022
Question | Answer |
---|---|
Changes to matter that alter the appearance of a substance, but do not make something new. | Physical Changes |
Changes to matter that produce a new substance through a chemical reaction. | Chemical Changes |
Chemical reactions that take in heat energy. | Endothermic |
States that matter cannot be created or destroyed. | Law of Conservation of Matter |
Chemical reactions that release heat energy. | Exothermic |
The left side of a chemical equation that shows the materials you start with in a reaction. | Reactants |
Changes that alter the center of an atom. | Nuclear |
The right side of a chemical equation that shows the materials you make or end up with in a reaction. | Products |
Nuclear reaction that happens in stars, which combines smaller hydrogen atoms into bigger helium atoms and releases huge amounts of energy. | Fusion |
Nuclear reaction that happens in nuclear power plants that splits larger uranium/plutonium atoms into smaller atoms and releases huge amounts of energy. | Fission |
Give examples of chemical changes | Burning, rusting, digesting, reacting |
Give examples of physical changes | Melting, boiling, freezing, evaporating, breaking, dissolving |
Efficient energy, no pollution, alternative to fossil fuels. | Pros of Nuclear energy |
Radioactive waste that must be safely stored for thousands of years. | Cons of Nuclear energy |