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15 Cards in this Set

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  • Back
Elements are...
A substance that can't be broken down into simpler chemical substances.
(Examples are:gold, qxygen, hydrogen and carbon)
An atom and what's inside of it is...
The smallest particle of an element that has all the characteristics of that element. The nucleus is at the center or an atom.
An isotope is...
Some examples are...
Atoms of the same element that have a different number of neutrons.
(examples are: most carbon nuclei)
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)
Two types of bonds are...
covalent bond and ionic bond
A chemical reaction occurs...
when bonds are formed or broken, causing substances to recombine into differnt substances.
The difference between a mixture and solution is...
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).
A ph scale is a measure...
of how acidic or basic a solution is. It goes from 0-14
A base is...
any substance that forms hydroxide ions (OH-) in water.
An acid is...
any substance that forms hydrogen ions (H+)
Water and its importance to life is...
Water is the most important compound in living organisms. It makes up 70-95% of most organisms)
Water polar is...
water molecules that attract ions as well as other polar molecules. Because of this attraction, water can dissolve many compounds.
Some of water's properties are...
*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)
Brownian motion is...
The random motion of molecules in gas, liquid, & some solid molecules. All objects in motion have kinetic energy (Movement)
The process and results of diffusion in water is...
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.