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19 Cards in this Set
- Front
- Back
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matter
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anything that has mass and takes up space.
made of atoms |
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energy
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anything that brings about change
(energy can hold matter together or break t apart) |
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element
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something that is made up of only one kind of atom
(CANNOTbe broken down into a simpler form by a chemical reaction) |
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S, P, O, N, C, H
99 percent of living matter |
sulfur
phosphorus oxygen nitrogen carbon hydrogen |
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compounds
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made up of 2 or more elements in EXACT proportions.
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2 types of compounds
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molecular compounds
ionic compounds |
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molecule
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a group of atoms held together by the energy of chemical bonds
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What happens to a molecule when a chemical reaction occurs
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chemical bonds break, atoms are rearranged, and new bonds form
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molecular compounds form when...
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different atoms share their outermost electrons.
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ions
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electrically charged atoms (positive or negative)
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What happens when an atom LOSES an electron?
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it has more protons than electrons = positively charged
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What happens when an atom GAINS an electron?
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it has more electrons than protons = negatively charged
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ionic compounds
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ions of opposite charges attract one another to form electrically neutral compounds
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examples of importance of ions in life processes that take place in your body
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1. messages are sent along your nerves as potassium and sodium ions move in and out of nerve cells.
2. calcium ions are important in causing your muscles to contact 3. transportation of oxygen by your blood. |
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The movement of some substances into and out of a cell would not be possible without
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ions
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mixture
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a combination of substances in which individual substances retain their own properties
(can be solid, liquid, gas or combination of them) |
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suspension
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mixtures contained in living things.
formed when a liquid or a gas has another substance evenly spread throughout it. substances in a suspension eventually sink to the bottom |
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what keeps blood cells suspended
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the pumping of the heart
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organic compound
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always contains carbon and hydrogen and usually are associated with living things
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