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chemical & physical

chemical and pysical

QuestionAnswer
what is a physical property? can be observed without changing the identity or 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?)
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
mass the amount of matter in an object
weight mass x gravity (weight changes!)
density how tightly packed the atoms in an object are.
solubility the measure in which an object Dissolves into another object..
electric conduction the measure of a material's ability to allow the transport of an electric charge.
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 strengths of a substance to cause poisonous effects to living things.
physical change a change that happens without changing the chemical composition of a substance (usually reversible)
chemical change occurs when a substance undergoes a change that creates a new substance (not reversible)
examples of physical property color, odor, size, hardness, luster, phase of matter, mass, density, boiling point, melting point, solubility, and conductivity.
examples physical change form, size, shape, or color of an object can be changed without affecting what makes up the substance.
reactivity the state or power of being reactive
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. (chemical)
physical property color, odor, ductile, malleable, metal, nonmetal, mataloid boiling point, size, hardness, solubility, ability to dissolve, luster, conductivity, density, malleable, specified gravity
chemical property oxidation, flammability, combustibility, radioactivity, toxicity, reactivity
physical change example of dissolving, cutting, phase change
chemical change formation of compound, example of reacting, example of oxidation, example of toxcicity
Created by: mal14