Unit 1 CBA Review
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Vocabulary flashcards reviewing basic chemistry concepts and properties of water for 8th Grade Unit 1 CBA.
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32 Terms
Element
A pure substance made of the same type of atoms that cannot be chemically broken down (examples: silver, gold, hydrogen).
Compound
A pure substance made of 2 or more elements chemically combined (examples: H2O, rust, NaCl, CH4).
Mixture
A substance made of 2 or more elements or compounds that are not chemically combined.
Heterogeneous Mixture
A mixture with a non-uniform composition and distinct layers, different
Homogeneous Mixture
A mixture with a uniform composition where particles are evenly distributed throughout, same.
pH of 0-6
Acidic
pH of 7
nuetral
pH of 8-14
base
sour taste, acid or base
acid
bitter taste, base or acid
base
pH higher than 7, base or acid
base
pH lower than 7 acid or base
acid
feels slippery when touching acid or base
base
feels smooth when touching base or acid
acid
reacts with metals to produce hydrogen base or acid
acid
usually does not react with metals base or acid
base
has a higher +H concentration acid or base
acid
produced hydroxide ions OH
base
as the pH number decreases, the strength of an acid ___
increase
strong based often have a ___ taste
bitter
pure water has a pH of ___, with means its ___
7, neutral
what is the strongest acid 0-6
0
what is the strongest base 8-14
14
has a pH less than 7
acid
tastes bitter
base
feels slippery when touched
base
reacts with certain metals to produce hydrogen gas
acid
Cohesion
A property of water where water molecules stick to water molecules (example: water drops).
Adhesion
A property of water where water molecules stick to another substance (example: water sticking to a stem).
Surface Tension
The skin-like layer on the surface of H2O caused by water molecules pulling together.
Insect Support on Water
Enabled by cohesion and surface tension, which create a skin-like layer on top of the water that allows small insects to stay on top instead of sinking.