Chapter 1
How many significant figures is 0.0034 g?
2
Which of the following elements is chemically similar to potassium?
a. calcium
b. arsenic
c. phosphorus
d. cesium
d. cesium
How many moles of O are in 2.45 moles of H2CO3?
a. 7.35 moles O
b. 39.2 moles O
c. 118 moles O
d. 2.45 moles O
a. 7.35 moles O
Based on solubility rules, which of the following compounds should be soluble in water?
a. Hg2Cl2
b. Na2S
c. Ag2CO3
d. BaSO4
b. Na2S
Indicate the mass number, protons, neutrons, and electrons:
Isotope: Pb-209
Atomic number: 82
Mass number: 209
Protons: 82
Neutrons: 127
Electrons: 82
The density of a block of metal is determined by weighing it, then submerging it in water. Based on the data below, what is the density of the block?
Mass of block: 25.472 g
Volume of block: 9.5 cm3
2.7 g/cm3
Use the periodic table to locate where the halogen elements are located
Group 7A
What percent by mass of oxygen is present in carbon monoxide, CO?
a. 58%
b. 59%
c. 57%
d. 60%
c. 57%
Based on solubility rules, which of the following compounds should be insoluble in water?
a. NaCl
b. MgBr2
c. FeCl2
d. AgBr
d. AgBr
The formula for magnesium sulfate is:
a. MnS
b. MgS
c. MgSO3
d. MgSO4
d. MgSO4
Determine the number of neutrons in 15N
neutrons: 8
What is the formula for the ionic compound containing iron (III) ions and iodide ions?
a. FeI
b. Fe2I
c. FeI2
d. FeI3
d. FeI3
When balanced the coefficient for O2 in the following equation is:
_C2H4 + _O2 -> _CO2 + _H2O
3
Predict the products of the following single replacement reaction.
Fe(s) + CuSO4(aq) ->
Cu(s) + FeSO4(aq)
Calculate the mass of O in 4.36 g of Cl2O7?
2.67 g O
Answer with the correct number of significant figures to the problem below:
4.5x1014 / 8.3x108
5.4 x 105
Name the following binary compound: MnCl2
Manganese (II) chloride
Ammonia reacts with oxygen to form nitric oxide and water vapor:
4NH3 + 5O2 -> 4NO + 6H2O
When 40.0 g of NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent?
O2
What will occur when solutions of ZnSO4 (aq) and MgCl2 (aq) are mixed?
No precipitate will form
What mass of K2CO3 is needed to prepare 200. mL of a solution having a potassium ion concentration of 0.150M?
2.07 g
A runner averages 8 minutes and 25 seconds per mile. What is the runner's average velocity in miles per hour?
7.13 mi/hr
Give the formula of iron (II) phosphate
Fe3(PO4)2
The first step in the Ostwald process for producing nitric acid is
4NH3(g) + 5O2(g) -> 4NO(g) + 6H2O(g)
If the reaction of 150. g of ammonia with 150. g of oxygen gas yields 87. g of nitric oxide (NO), what is the percent yield of this reaction?
77%
Sulfur trioxide (SO3) is prepared by oxidation of 12.0 g sulfur dioxide (SO2) and 20.0 g of oxygen according to the unbalanced reaction below:
SO2 (g) + O2 (g) -> SO3 (g)
At the end of the experiment, 12.1 g of SO3 is produced.
What is the limiting reagent?
Calculate the percent yield of the reaction
Limiting reagent: SO2
Percent Yield: 80.7%
A 4.691 g sample of MgCl2 is dissolved in enough water to give 750. mL of solution. What is the magnesium ion concentration in this solution?
6.57 x 10-2 M