Review Game. What is the difference between a law and a theory? A law is a summary of observed behavior A theory is an explanation of behavior. How many grams are in a Decagram? 10. What is the appropriate SI unit for the mass of a block of gold? kilogram.
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6.125 + 70. = ?
Cooking an egg
The products are different substances from the starting materials.
Anything on the periodic table.
Water and air are NOT elements.
Who is credited with doing an experiment showing that the nucleus contains positive charges?
Lead (II) Oxide
Solid (precipitation) formation
It is assumed and therefore not needed to be written.
Why do we NOT change subscripts when writing a balanced chemical equation?
Compounds with different numbers of atoms in their arrangement are different substances.
Who discovered new information on acids by experimenting with conductivity solutions?
Why are the standard units of mass (grams) not useful when studying atoms?
Because atoms are so small
2Mg(s) + O2(g) 2MgO(s)
tells us that this many moles of magnesium are needed to produce 2 moles of magnesium oxide?
2 moles Mg produce 2 moles MgO
Which color of visible light has the greatest amount of energy per photon?
EXCEPTION - HYDROGEN
Nonmetals make ______ ions.
Metals make cations.
Nonmetals make anions.
(1.5 mol) (0.08206 L mol/K atm) (295K)
= 12 atm
If the temperature of an ideal gas is raised from 50°C to 100°C while the pressure remains constant, what will happen to the volume?
A solid changes directly into a gas without changing into a liquid first.
What is the term used by chemists to describe a solution in which a small amount of solute is dissolved in the solution?
The total mass of a solution is 50g. The solvent mass is 30 g. What is the mass percent of the solute?
Mass % = mass of solute x 100%
mass of solution
Mass of solute = 50g – 30 g = 20 g
Mass% = 20g/50g x 100% = 40%
H2PO4 + HCl H3PO4+ + Cl-
H2PO4 + HCl H3PO4++ Cl-
A substance that donates a proton
100 times more basic.
You are mixing two solutions of citric acid. One container is 2M. The other solution contains almost twice as much and is at 4M. If you mix them together, what would you guestimate the new Molarity is?
Between 3 and 4