Unit 1: Matter & Measurement
Unit 2: Atoms/Molecules/Ions
Unit 3: Mass Relationships in Chemical Rxns
Unit 4: Solutions
Potpourri
100
Which of the following particles are isotopes?
B and D
100
Name the following compounds:
a. H2SO4
b. FeCO3
c. SCl3
a. sulfuric acid
b. iron (II) carbonate
c. sulfur trichloride
100
Balance the equation
___ H2 (g) + _____ O2(g) ----> ____ H2O(l)
_2__ H2 (g) + _____ O2(g) ----> ___2_ H2O(l)
100
Write the net ionic equation for the reaction between Li2CO3 and AgNO3.
2 Ag(aq)+1 + CO3(aq)-2 ---> Ag2CO3(s)
100
You are curious to know whether adding fabric softener to your laundry will reduce the amount of static cling. What would the independent variable be in this investigation?
amount or type of fabric softener
200
Write the correct isotopic symbol for elements A, B, and C.
115B
2715P-3
157N
200
Write formulas for each of the following compounds:
a. carbon tetrachloride
b. chlorous acid
c. magnesium phosphite
a. CCl4
b. HClO2
c. Mg3(PO3)2
200
If you start with 15 g of H2 and 50 g of O2, how many grams of H2O will you produce?
___ H2 (g) + _____ O2(g) ----> ____ H2O(l)
56.31 g H2O
200
Identify each type of reaction:
a. decomposition
b. double replacement
c. single replacement
d. double replacement
e. hydrocarbon combustion
200
Identify the physical properties:
a. must be kept in mineral oil so it doesn't react with water in the air
b. less dense than water
c. silvery color
d. reacts with chlorine gas to produce NaCl
e. Melting point of 97.5 0C
b,c,e
300
Select all that apply.
A. diatomic molecules
D. compounds
300
Determine the most abundant isotope for each of the following elements:
a. Fe
b. H
c. Al
a. Fe-56
b. H-1
c. Al-27
300
How many oxygen atoms are in 45 g of CaCO3?
8.11 x 1023 atoms of O
300
a. Give the oxidation number of every element.
b. Identify the oxidized and reduced elements.
2 KClO3 ------> 2 KCl + 3 O2
2 KClO3 ------> 2 KCl + 3 O2
+1+5-2 +1-1 0
Oxidized element = oxygen
Reduced element = chlorine
300
Name 2 elements that would have similar chemical and physical properties as calcium.
Magnesium, Strontium, Barium, Beryllium
400
Select all that apply.
B. Polyatomic molecules
D. compounds
400
Determine the percent by mass of each element in ammonium sulfate.
21.2% N
6.1% H
24.3% S
48.43% O
400
__Na + ____ H2O ----> ____ H2 + ____NaOH
1. How many grams of hydrogen gas will be produced when 40 g of sodium is reacted with unlimited water?
2. What is the % yield if you produce 1.0 g of hydrogen gas in lab?
1. 1.76 g
2. 56.8%
400
Determine the Molarity of a solution made with 75 g of CaCl2 in 450 mL of water.
1.50 M
400
Predict the products of the following 3 reactions:
a. CH4 + O2----->
b. F2 + NaCl ------>
c. HNO3 + Ba(OH)2------>
a. CH4 + 2 O2-----> CO2 + 2 H2O
b. F2 + 2 NaCl ------> Cl2 + 2 NaF
c. 2 HNO3 + Ba(OH)2------>Ba(NO3)2 + 2 H2O
500
Element X has 3 isotopes with the following abundances. Calculate its average atomic mass.
70% X-45
25% X-46
5% X-44
45.2 amu
500
A major textile dye manufacturer developed a new yellow dye. The dye has a percent composition of 75.95% C, 17.72% N, and 6.33% H by mass with a molar mass of about 240 g/mol. Determine the empirical and molecular formula of the dye.
C5H5N
C15H15N3
500
___N2 + ____H2 ------> _____NH3
1. You have 10 g of H2 and 40 g of N2, which is the limiting reagent?
2. What is your theoretical yield?
1. N2
2. 48.65 g NH3
500
Assign oxidation numbers to all elements in the following particles:
a. CaH2
b. HCO3-1
c. HClO4
d. Fe(NO3)3
a. CaH2
+2-1
b. HCO3-1
+1+4-2
c. HClO4
+1+7-2
d. Fe(NO3)3
+3+5-2
500
A drug company has developed a drug that they claim will boost your brain power by 50%. If you develop an investigation to test their claim, determine each of the following:
a. dependent variable
b. independent variable
c. constants (2)
d. control group
a. dependent variable - brain power
b. independent variable - whether you take the drug or not
c. constants - same amount of sleep, food, exercise, etc.
d. control - group given placebo (fake) pill