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11 Cards in this Set
- Front
- Back
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Physical property is any property you can observe without changing its identity. Ex. Color, shape, size, state of matter, smell, malleability, ductility, plasticity, magnetism, viscosity. |
Physical change is a change in size, shape or state of matter; the substance is the same after. |
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Chemical properties are characteristics of a substance that indicate whether it can undergo a chemical change. Ex. Reactivity, flammability, stability, toxicity. |
Chemical change is the identity if the substance changes, physical properties are changed. |
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Law of conservation of mass is the mass of all substances before a chemical change equal to the mass of all substances after. |
Solids have definite shape and volume |
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Liquids have a definite volume but not a definite shape. |
Gases have no definite shape or volume. |
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More thermal energy applied to a substance = closer it is to becoming a gas. |
As objects get hotter, they begin to expand. |
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A fluid is a liquid or gas. |
Density = M -- V |
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Diatomic molecules are two atoms of the same type bonded together Ex. H2 O2 Br2 F2 I2 N2 Cl2 |
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Endothermic means energy is being absorbed. |
Exothermic means energy is being released. |
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Nucleus in center of an atom is made of protons and neutrons. |
Protons have a positive charge. Neutrons are neutral. Electrons have a negative charge. |
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The mass number is the number of protons and neutrons in an atom of an element. |
An isotope is an element with a different number of neutrons in the nucleus. Ex. Carbon 12 and Carbon 14 |
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Every atom wants 8 electrons in their outer shell. Electrons on the outer shell are called valence electrons. |
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