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15 Cards in this Set
- Front
- Back
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Elements are...
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A substance that can't be broken down into simpler chemical substances.
(Examples are:gold, qxygen, hydrogen and carbon) |
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An atom and what's inside of it is...
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The smallest particle of an element that has all the characteristics of that element. The nucleus is at the center or an atom.
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An isotope is...
Some examples are... |
Atoms of the same element that have a different number of neutrons.
(examples are: most carbon nuclei) |
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A compound is...
Some examples of compounds are... |
A compound is composed of atoms of two or more different elements that are chemically combined.
(Examples: table salt) |
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Two types of bonds are...
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covalent bond and ionic bond
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A chemical reaction occurs...
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when bonds are formed or broken, causing substances to recombine into differnt substances.
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The difference between a mixture and solution is...
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A mixture is a combination of substances in which the individual components retain their own properties while a solution is a mixture in which one or more substances are distributed evenly in another substance (solvent).
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A ph scale is a measure...
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of how acidic or basic a solution is. It goes from 0-14
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A base is...
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any substance that forms hydroxide ions (OH-) in water.
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An acid is...
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any substance that forms hydrogen ions (H+)
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Water and its importance to life is...
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Water is the most important compound in living organisms. It makes up 70-95% of most organisms)
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Water polar is...
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water molecules that attract ions as well as other polar molecules. Because of this attraction, water can dissolve many compounds.
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Some of water's properties are...
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*water expands when it freezes
*water is an excellent vehicle for carrying substances in living systems *Water requires a lot of heat to increase temperature *water acts as an insulator in the environment (coast vs. desert) |
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Brownian motion is...
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The random motion of molecules in gas, liquid, & some solid molecules. All objects in motion have kinetic energy (Movement)
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The process and results of diffusion in water is...
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Process: The net movement of particles from an area of higher concentration to an area of lower concentration.
Results: Occurs because of random motion of molecules. Concentration, temp., & pressure can effect the rate of diffusion. Diffusion is one of the ways cells move substances in & out. |
