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Physical & Chemical
| Question | Answer |
|---|---|
| What is a Physical Property | a characteristic of matter that can be observed and measured without changing the identity or chemical makeup of the substance. |
| Color | the color of a substance, found by observing it |
| Odor | the smell a substance produces |
| Size | can be measured without altering the chemical makeup of the substance |
| Hardness | the measure of how difficult or easy it is to scratch a substance |
| Luster | describes how light is reflected off the surface of an object (How shiny is the object?) |
| Mass | the amount of matter in an object; never changes |
| Density | how tightly packed the atoms in an object are. |
| What is a Boiling Point | the point at which a substance changes from a liquid to a gas |
| What is a Melting Point | the point at which a substance changes from a solid to a liquid |
| Solubility | the measure in which an object dissolves into another object |
| Electrical Conductivity | the measure of a material’s ability to allow the transport of an electric charge |
| What is a Chemical Property | a trait or behavior of a substance that gives it the ability or inability to undergo a chemical change |
| Combustibility and Flammability | the ability a substance has to burn |
| Combustion | a chemical reaction that produces heat and light |
| Toxicity | the ability or strength of a substance to cause poisonous effects to living things |
| What is a Physical Change | a change that happens without changing the chemical composition of a substance. No new substance is formed. The change is usually (but not always) reversible. |
| What is a Chemical Change | occurs when a substance undergoes a change that creates a new substance with different chemical and physical properties than the original substance. The change is not reversible. |
| What causes the odor when milk sours? | When milk begins to ferment (break down), it smells bad because of the bacteria that is being formed. Chemicals with a sour odor are released by this bacteria. |
| What causes the bubbles in a chemical reaction? | Some chemical reactions occur and cause a gas to form. The bubbles are the evidence of the gas fumes escaping. |
| What is a precipitate? | It is an insoluble (can’t dissolve) solid that is formed when two liquids combine. |
| Melting | |
| Freezing | |
| Cutting | |
| Dissolving | |
| Breaking | |
| Burning | |
| Cooking | |
| Metabolism | |
| Oxidation | |
| Fermentation |
Created by:
Matthew Bryant
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