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Review Sheet for POST TEST. 1. What is the difference between an element and a compound?.

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An element is a “pure” form of matter; examples include Hydrogen (H), Sodium (Na), Copper (Cu), and everything else on the periodic table.Compounds are combinations of elements; 2 or more elements; Examples include Water (H2O), Salt (NaCl), and Nitric Acid (HNO3)

b) Moving top to bottom… 1. atomic radius increases 2. reactivity increases (on the left) 3. atomic number increases
3. Due to the LOCM, matter is not created or destroyed…so, how in a chemical reaction can matter gain/lose weight?

- if something is burned, gas is given off (causing a loss in mass, Ex. CO2)- if some new material is formed then gas can be added (causing a gain in mass, Ex. O2)

Because the relationship between speed and KE is a complex relationship….If speed doubles, the KE increases 4 times.

If something exceeds its limit (the amount it can bend) then it will break. (Example, two plates come together and the rocks continue to bend until it reaches its limit and breaks causing an earthquake)

a transfer is when energy moves into another object a transformation is when energy changes forms
A transfer is when energy moves into another object. A transformation is when energy changes forms.
igneous rock granite is very dense not porous sedimentary rock sedimentary rock is not dense porous
Igneous Rock (granite) is very dense; not porous; Sedimentary Rock (sedimentary rock) is not dense; porous
The one with people allows the sound waves to be absorbed but the empty one allows those to bounce around causing echoes.
There was a solar nebula; the matter spun and gravity pulled the matter to the center forming the Sun.
because they are made out of different bonds sugar is molecular covalent and copper is metallic
Because they are made out of different bonds; sugar is molecular covalent and copper is metallic.