Conversions!
Convert 52,793 Tmol to pmole. Express the answer to three significant figures.
5.28 x 1028pmol
What is the mass (in grams) that corresponds to 0.0653 mol of Hg?
Round to 3 sf
13.1g
Balance the following equation:
NH3 + O2 ---> N2 + H2O
4NH3 + 3O2 ---> 2N2 + 6H2O
How many valence electrons does oxygen have and what is its' charge?
How many valence electrons does boron have and what is its' charge?
6 valence and -2.
3 valence and +3
Name the following Binary Compounds:
N2O4
Ca3Cl
CH4
OF2
Dinitrogen tetroxide
Tricalcium chloride
Carbon tetrahydride
Oxygen difluoride
Convert 47.260 fg to cg. Round your answer to four significant figures.
4.726x10-12cg
Determine the number of Zn atoms in 98.9 grams of Zn.
3 sf
9.11x1023atoms
What is the mass % of each element in sodium chloride?
%Na = 39.3%
%Cl = 60.7%
Which of the following is an isotope of Carbon?
a) A = 30, Z=15
b) A = 15, Z= 6
c) A= 14, Z = 7
B
Carbon has 6 protons.
List the polyatomic ion formulas for nitrite, nitrate, sulfite, and sulfate.
Nitrite: NO2-
Nitrate: NO3-
Sulfite: SO32-
Sulfate: SO42-
John traveled 313,600 inches on his bike. His sister, Sarah, biked 5.03 miles. Who traveled the farthest distance and by how much? (answer in km)
(1m=39.37in)
(1 mi = 1.609 km)
John traveled 7.965 km
Sarach traveled 8.093km
Sarah traveled farther by about 0.128km
How many Na+ ions are in 9.898 grams of sodium sulfide?
4 sf
1.527 x 1023ions
A chloride of silicon contains 83.2 mass % Cl. What is the empirical formula?
SiCl4
Argon has three naturally occurring isotopes Ar-40, Ar-36, and Ar-38.
Determine the number of protons, neutrons, and electrons in each carbon isotope.
Ar-40: 18 protons, 18 electrons, 22 neutrons
Ar-36: 18 protons, 18 electrons, 18 neutrons
Ar-38: 18 protons, 18 electrons, 20 neutrons
List the polyatomic ion formulas for hypochlorite, chlorite, chlorate, and perchlorate.
Also for hypoiodite, iodite, iodate, and periodate.
Hypo- : ClO- and IO-
-ite : ClO2- and IO2-
-ate : ClO3- and IO3-
Per - : ClO4- and IO4-
Lois wants to send a box of oranges to a friend by mail. The box of oranges cannot exceed a mass of 15lbs. If each orange has a mass of 7.05oz , what is the maximum number she can send? (2sf)
(1oz=28.35g)
(1lb=453.6g)
She can send 34 oranges!
2K + 2H2O ---> 2KOH + H2
How many grams of hydrogen gas are produced from 2.35 moles of water?
2.37 g H2
Determine the empirical and molecular formula for chrysotile asbestos. Chrysotile has the following percent composition: 28.03% Mg, 21.60% Si, 1.16% H, and 49.21% O.
The molar mass for chrysotile is 520.8 g/mol.
Empirical: Mg3Si2H3O8
Molecular: Mg6Si4H6O16
Between which types of elements does covalent bonds form between?
Draw the lewis dot structure for water.
Covalent bonds occur when nonmetals share electrons.
What are the names for the following ionic compounds?
Al4C3
HgO
Ca(NO3)2
aluminium carbide
mercury (II) oxide
Calcium nitrate
To connect your computer to the internet via a wired connection, you need 546 cm of cable, which sells for $0.235 / ft. What is the cost of the cable?
(1 in = 2.54cm ; 12 in = 1ft)
Keep in mind sig figs!
$4.21
Balance the following equation:
Cr + AgNO3 ---> Cr(NO3)2 + Ag
How much silver can be produced from 12.7 grams of silver nitrate?
8.06 grams Ag
A strip of zinc metal weighing 5.00 g is placed in an aqueous solution containing 6.25g of silver nitrate, causing the following reaction:
Zn + AgNO3 → Ag (s) + Zn(NO3)2
Balance the following chemical equation to answer the following questions:
- What is the limiting reagent?
- How many grams of silver is formed?
- How many grams of the excess reagent is left over?
(3sf)
AgNO3 is the limiting reagent
3.97 g of Ag is formed
3.79 g of Zn is left over
Draw the lewis dot structure for phosphorous. Based on this, the preferred bonding pattern for phosphorous is ____ bonds and ___lone pairs.
What is the preferred bonding pattern for oxygen?
3 bonds and 1 lone pair
2 bonds and 2 lone pairs
Write the formulas that are connected to the ionic compound name:
Iron (II) nitrate
Potassium permanganate
Silver bicarbonate
ammonium phosphate
Fe(NO3)2
KMnO4
AgHCO3
(NH4)3PO4