Measurement and Matter
What is the formula to measure the density of a liquid?
density = mass / volume
State the difference between a neutral element and an ion.
number of electrons
Define electron affinity.
energy needed to add 1 mole of electron to one mole of gaseous molecule
What is the Avogadro's number?
6.02x10^23
How many significant figures are there in 1230 grams of sugar?
three
Explain how light is produced.
excited state going back to ground state to release photon
Iron, more shielding effect
Balance the equation:
CO2 (g) + H2O (l) --> C6H12O6 (s) + O2 (g)
6 6 1 6
Draw the particle diagram of pure solid gold.
circles with no space
State the condensed electron configuration of aluminum.
[Ne] 3s2 3p1
State and explain which is more reactive -- Oxygen or Fluorine atom?
Fluorine, higher electronegativity
Calculate the molar mass of Ba(OH)2
171.34 g/mol
Give and explain 2 random errors and 2 systematic errors of the flame test experiment.
Random - wrong position of stick, wrong length of time
Systematic - yellow fire, incomplete combustion
Draw the orbital diagram of fluorine ion (F-1)
drawing must end with 2p6
Explain why a sulfide ion, S2–, is larger than a chloride ion, Cl-
S gained 2 electrons, Cl only gained 1
In one minute, get the percent composition of CO.
42.88%C, 57.12%O
Outline the steps of separating copper wires, water, soil, and rocks.
handpicking for rocks, magnet for wires, filtration for soil and water
Determine the last electron configuration given the following quantum numbers:
n=3, l=1, ml= +1, ms= -1/2
3p6
Explain why nonmetals are generally more electronegative than metals.
more valence electrons, more ability to form covalent bonds
How much carbon is needed to produce 8 moles of carbon dioxide in the reaction: C + O2 --> CO2
96.08grams