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physical & chemical
Physical &Chemical
Question | Answer |
---|---|
physical property | A physical property is a characteristic of matter that can be observed and measured without changing the identity or chemical makeup of the substance. |
color | We can easily observe the color of a substance by looking at it. |
odor | Many substances have a noticeable odor. |
size | The size of a substance can be measured without altering the chemical makeup of the substance. |
hardness | Hardness is the measure of how difficult or easy it is to scratch a substance. |
luster | Luster describes how light is reflected off the surface of an object. (How shiny is the object?) |
mass | the amount of matter in the object. ;The same everywhere. |
weight | is the measure of the amount of matter in your body. ; changes depending on gravity. |
density | Density is how tightly packed the atoms in an object are. |
boiling point | The boiling point is the point at which a substance changes from a liquid to a gas. |
melting point | The melting point is the point at which a substance changes from a solid to a liquid. |
solubility | Solubility is the measure in which an object can dissolve into another object . |
electrical conductivity | Electrical conductivity is the measure a material's ability to allow the transport of an electric charge. |
chemical property | A chemical property is a trait or behavior of a substance that gives it the ability or inability to undergo a chemical change. |
combustibility and flammability | Combustibility and flammability both mean the ability a substance has to burn. |
combustion | Combustion is a chemical reaction that produces heat and light. |
toxicity | Toxicity is the ability or strength of a substance to cause poisonous effects to living things. |
physical change | A physical change is 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. |
chemical change | 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. |
reactivity | How easy an atom has a chemical reaction with another element. |
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. |
examples of chemical property | Oxidation, Flammability, Toxicity, Reactivity, Combustibility, Radioactivity |
examples of chemical change | Oxidation, Toxicity, Formation of compound, Reacting |
examples of physical change | Dissolving, Cutting, Changing phases |
examples of physical property | Melting point, Luminescence, Odor, Size, Boiling point, Luster, Hardness, Solubility, Conductivity, Ability to dissolve, Magnetism, Color, Ductile, Malleable, Mass, Density, Phase, Special gravity, Metal, Nonmetal, Metalloids |