Conversions
What is 65010000 in scientific notation?
6.501 x 107
Pb is a...
& (metal or nonmetal)
Br is a...
metal, nonmetal
MgO is a covalent compound
True or false?
False
How many grams are in 8.76 mol Sr?
768 g Sr
LiNO3 is insoluble
True or false
False
If I have 16.1 m of rope, how many nm do I have?
1.61 x 1010 nm
How many protons, electrons, and neutrons are in Be?
4 protons, 4 electrons, 5 neutrons
What is the name of CCl4?
Carbon tetrachloride
How many atoms are in 45.23 g CH4?
1.70 x 1024 atoms
Complete the reaction:
Al(NO3)3(aq) + Na3PO4(aq) -->
AlPO4(s) + 3 NaNO3(aq)
If the density of iron is 7.87g/cm3 and it has a mass of 325.7 g, what is the volume?
41.4 cm3
What element has the isotope 3216X2-?
Sulfur
What is the formula for copper(II) nitrate?
Cu(NO3)2
What is the percent by mass of each element in Al2(SO4)3?
15.77% Al, 28.11% S, 56.12% O
How many molecules sodium sulfate will be formed if you start with 238 grams of sodium hydroxide?
2 NaOH + H2SO4 --> 2 H2O + Na2SO4
1.79 x 1024
A bike tire has pressure of 47.9 pounds/in2, what is the pressure in g/cm2? (1 pound= 454 g, 1 in= 2.54 cm)
8560 g/cm2
How many protons, electrons, and neutrons are in Ca ion with a charge of +2?
20 protons, 18 electrons, 20 neutrons
What is the name of Fe2S3?
iron(III) sulfide
What is the empirical formula of a compound containing 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen?
CH2O
What mass of O2 will be needed to burn 51.6 g of B2H6?
B2H6 + 3 O2 --> 2 HBO2 + 2 H2O
179 g O2
If I deliver a certain medication at rate of 5.2 mg/min, what is the rate in micrograms/sec?
87 micrograms/sec
What ion has 53 protons, 54 electrons, 74 neutrons, and a charge of -1?
Iodine ion
What is the name of Mn3(PO4)2?
manganese(II) phosphate
What is the molecular formula of a compound with 28.03% Mg, 21.60% Si, 1.16% H, and 49.21% O with a molar mass of 520.8 g?
Mg6Si4H6O16
What is the complete and net ionic equation of CoBr3(aq) + K2S(aq) --> Co2S3(s) + KBr(aq)? (Hint: Don't forget to balance)
Complete: 2 Co3+(aq) + 6 Br-(aq) + 6 K+(aq) + 3 S2-(aq) --> Co2S3 (s) + 6 K+(aq) + 6 Br-(aq)
Net: 2 Co3+(aq) + 3 S2-(aq) --> Co2S3(s)