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23 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Cohesion |
The linking together of like molecules, often by hydrogen bonds |
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Adhesion |
The clinging of one substance to another, such as water to plant cell walls, by means of hydrogen bonds |
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Surface Tension |
A measure of how difficult it is to stretch or break the surface of a liquid. Water has a high surface tension b/c of the hydrogen bonding of surface molecules |
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Temperature |
A measure in degrees of the average kinetic energy (thermal energy) of the atoms and molecules in a body of matter |
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Heat |
Thermal energy in transfer from one body to another |
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Specific heat |
The amount of heat that must be absorbed or lost for 1 g of a substance to change its temperature by 1°C |
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Solution |
A liquid that's a homogenous mixture of 2 or more substances |
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Solvent |
The dissolving agent of a solution |
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"Solvent of life" |
Water Dissolves things b/c of its polar covalent bonds Allows living things to get & use salt, proteins, sugars, etc. |
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Solute |
A substance that is dissolved in a solution |
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Acid |
A substance that increases the hydrogen ion concentration in a solution H+ > 7 |
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Base |
A substance that reduces the hydrogen ion concentration in a solution H+ < 7 |
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pH |
Potential of the hydrogen atom pH < 7 ----> acid pH = 7 ----> neutral pH > 7 ----> base |
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Buffer |
A solution which limits pH changes in a solution Usually a weak acid w/ a corresponding base |
Ex: blood, cells, other bodily fluids |
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Hydrophobic |
Doesn't like water |
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Hydrophilic |
Loves water |
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Dense/Density |
The # of individuals per unit area or volume |
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What's the structure of water? |
-polar covalent bonds -H bonds |
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4 emergent properties of water |
1. cohesion 2. moderation of temperature 3. less dense solid than as a liquid 4. universal solvent |
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Cohesion of water (& adhesion of water) |
Water sticks to itself (H2O molecules sticking to other H2O molecules) Also adhesion: it hydrogen bonds to other molecules Creates surface tension, this is how plants get water everywhere |
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Does water have high or low specific heat? What does this mean? |
High It's slower than most liquids to absorb/lose heat ---> less change in temperature. Therefore large bodies of water regulate our climate |
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Why is it important that water is more dense as a solid than as a liquid? |
Because ice floats, and therefore life can live beneath it |
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Why is it important that water is the solvent of life? |
It allows living cells/things/organisms to obtain and use nutrients |
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