Module #6
What is a stoichiometric coefficient?
The number to the left of a substance in a chemical equation.
Which is longer, a string that measures 0.25 km or a string measuring 101 mm?
The string measuring .25km is longer.
Two masses are positively charged. Will they repel or attract each other?
They will repel.
A substance has 47 positive charges and 47 negative charges. What is its overall charge?
Neutral
When atoms share electrons to make a molecule, is the compound ionic or covalent?
Covalent
What is the empirical formula for Al2Cl6?
AlCl3
Convert 34.5 kL into L.
34,500 L
What is the name of an atom that is made up of 10 protons and 10 electrons?
Neon
How many protons, electrons, and neutrons are in 40Ar?
18 protons, 18 electrons, and 22 neutrons
What column in the periodic chart contains the elements (atoms) with the ideal electron configuration?
Column 8A
What is the empirical formula for K2Cr2O7?
K2Cr2O7
Convert 0.001400 into scientific notation.
1.400 x 10-3
Which has a higher wavelength: Red light or Blue light?
Red light
What is an isotope?
atoms with the same number of protons but different numbers of neutrons.
Which of the following atoms gives up its electrons most easily? Mg, Na, or P
Na
What does Gay-Lussac's Law tell us?
the volume of gases in a chemical equation
Convert 0.00045 kg to mg.
450 mg
What does mass number tell you?
the total number of neutrons and protons in an atom.
Draw the full electron configuration of Ca on the board.
1s22s22p63s23p64s2
Draw the Lewis structure for the following molecule on the board: PH3
Mr. Phillips will check on board
What is molar mass?
the mass of one mole of a given compound.
Gold has a density of 19.3 grams per mL. If a gold nugget has a volume of 5.60 L, what is its mass?
1.08 x 105 grams
What is the wavelength of light whose frequency is 6.15 x 1014 Hz?
c = 3.0 x 108 m/sec
f = c / wavelength
4.9 x 10-7 m
Draw the abbreviated electron configuration of Cd on the board.
[Kr]5s24d10
Give the chemical formula for the following molecule:
Chromium (III) oxide
Cr2O3