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Chemical & Physical
Question | Answer |
---|---|
Physical Properties | 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 | Amount of matter in an object (Stays the Same) |
Weight | The amount of an object's weight. (Varies when you change the mount of gravity. |
Density | Density is how tightly packed the atoms in an object are. |
The boiling point is the point at which a substance changes from a ___________________ to a ______________? | Liquid to a gas. |
The melting point is the point at which a substance changes from a _________________ to a ____________________? | Solid to a Liquid. |
Solubility is the measure in which an ______________ ________________________________________________? | Measurement of which an object dissolves into another object. |
Electrical conductivity is the measure __________________________________________________? | Of which an object can conduct electricity through it into another object. |
Chemical Properties | 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. |
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 Physical Properties | Boiling Point, Hardness, Odor, Size, Magnetism, Ability to Dissolve, Ductile, Luster, Conductivity, Malleable, Phase, Solubility. |
Examples of Chemical Properties | Flammability, Oxidation, Toxicity, Reactivity, Combustibility, and Radioactivity. |
Examples of Physical Changes | Examples of dissolving, cutting, and changing phase. |
Examples of Chemical Changes | Formation of compound, example of reacting, example of oxidation, and example of toxicity. |