The name given to number of atoms in a mole of any pure substance is called...
What is Avogadro's number
100
The atomic mass of magnesium is 24.3 amu. The reason that this value is not a whole number is that.............?
--Magnesium only exists as a dimmer.-----
--The mass of magnesium is the sum of the masses of the potons and electrons in the atom.-----
--Magnesium has 12 electrons.-----
--Magnesium has more than one isotope.-----
What is ---Magnesium has more than one isotope
100
Find the molar mass of KMnO4....
158 atoms-----
158 grams-----
110 grams-----
6 grams-----
none of these are close
What is 158 grams
100
Find the volume of 3 moles of any gas at STP ?....
67.2 L,-----
.134 L,-----
.134 mL,-----
6.02 x 1023 mL,-----
None of these is even close
What is 67.2 L
100
If the atoms that share electrons have an unequal attraction for the electrons, the bond is called?..........
Nonpolar covalent-----
Polar covalent-----
Ionic-----
Tripolar-----
None of these-----
What is -- Polar covalent
200
How many moles of copper are in a 254 gram peice of copper?
What is 4 MOLES
200
Find the mass of 4.3 moles of Oxygen (at STP).
What is 68.8 g
200
If you have a sample of Carbon 12 that weighs 600 grams, how many atoms are in that sample?....
3.01 x 1025-----
6.02 x 1023-----
50 x 1023-----
50-----
7.2 x 103-----
What is 3.01 x 1025
200
Draw the Lewis structure for Benzene, C6H6
See answer key
200
The type of bond in bromine gas, Br2 is… (electronegativity of Br is 2.8,electronegativity for Li is 1.0)...............................................
nonpolar covalent-----
polar covalent-----
electropositive-----
pirolovalent-----
ionic-----
What is..Nonpolar covalent
300
How many atoms are in 2.5 moles of Carbon?
What is 1.5 x 10^24 atoms OR 15. x 10^23
300
Find the molar mass of Potassium Chromate
What is... 194g
300
How many lead (Pb) atoms are in a piece of lead that weighs 392 grams?
What is 1.14 x 10^24 OR 11. x 10^23
300
find the volume of 15.3 x 10^23 atoms of krypton gas (at STP) ?.....
2.54 x 1023 L-----
2.54 L-----
342.7 x 1023 L-----
56.9 L-----
None of these is even close-----
What is 56.9 L
300
The boiling point of water (H2O) is higher (hotter) than the boiling point of hydrogen sulfide (H2S) because water is................?
More covalent-----
Ionic----- More polar-----
Less polar-----
What is ...more polar
400
If samples of two different elements each represents one mole, then what is the same about them?
What is---they contain the same number of atoms
400
Find the mass of 4 L of mercury (at STP) Note: Mercury, Hg, is a liquid, not a gas at STP. Density of Hg is 13500 grams/Liter D = M/V........................................
----54000 g---
----15052.8 g---
----3375 g---
----2.96 x 10-4 g---
----None of these is close
What is 54000 g
400
What is the formula for the ionic compound formed by the barium ion, Ba2+, and the hydroxide ion OH-?....
BaOH-----
BaOH2-----
Ba(OH)2-----
Ba(OH2)-----
Ba(OH)-----
What is... Ba(OH)2
400
Find the moles of lead (Pb) if you have 4 liters of Pb (at STP) Note: Lead is not a gas at STP. The density of Pb is 11350 grams/Liter D = M/V......................................
45400 moles-----
3.53 x 10-4 moles-----
4540 moles-----
219 moles-----
None of these is close-----
What is 219 moles
400
Draw the Lewis structure for CH2O, how many unbonded pairs of electrons are left on the oxygen atom?.................
zero-----
one-----
two-----
three-----
more than three-----
What is...TWO
500
As the atomic masses of the elements in the periodic table increase, the number of atoms in 1 mol of each element...............?
Decreases,-----
Increases,-----
Remains the same,-----
Becomes a negative number,-----
What is---remains the same
500
find the mass of 48 L of Neon (at STP).......
2.14 g-----
1075.2 g-----
15052.8 g-----
43 g-----
2.14 mole-----
What is... 43 grams
500
How many atoms are present in 60.2 grams of calcium? (this one will require two steps)?.....
1.5-----
60.2-----
60.2 x 10^23-----
9.04 x 10^23-----
none of these is close
What is 9.04 x 10^23
500
find the number of moles in 600 L of Argon gas (at STP)?..........
3612 x 10^23 moles-----
3.612 x 10^23 moles-----
13440 moles-----
15 moles-----
None of these is even close
What is... None of these is close
500
Draw a Lewis structure for N(CH3)3 on scratch paper.