Exam #1
Determine the correct nuclear symbol for the isotope containing 82 protons and 126 neutrons.
12682Pb 12644Ru 22286Rn 20882Pb 4019K
20882Pb
An element has the following successive ionization energies. Determine the number of valence electrons for this element.
1st IE: 632
2nd IE: 1380
3rd IE: 1889
4th IE: 2486
5th IE: 3217
6th IE: 18778
7th IE: 22657
5 valance electrons
How many sigma bonds and pi bonds make up single, double, and triple bonds?
single- 1 sigma
double- 1 sigma, 1 double
triple- 1 sigma, 2 double
Write the formula for Nitrate
Write the formula for phosphate
Write the formula for chlorate
Write the formula for carbonate
Write the formula for sulfate
NO3-
PO43-
ClO3-
CO32-
SO42-
What are the six strong acids?
H2SO4, HI, HBr, HCl, HNO3, HClO4
SO4 I brought NO3 clean ClO4thes
Complete the following calculation, keeping the correct number of significant figures:
10.03-1.11-8x10-3
8.91
Which of the following is/are diamagnetic? Select all that apply.
a.) Pb4+
b.) Cd2+
c.) Ti2+
d.) Ge
A & B
How many moles of KCl are contained in each solution?
0.556 L of a 2.3 M KCl solution
1.8 L of a 0.85 M KCl solution
114 mL of a 1.85 M KCl solution
1.28 moles
1.53 moles
.211 moles
Write the formula for cyanide
Write the formula for peroide
Write the formula for acetate
CN-
O22-
C2H3O2-
The ground state electron configuration for the Cu+ ion is?
1s22s22p63s23p63d10
An engineering firm uses a custom unit of distance for a client called pules when working with a metal alloy. The metal alloy has a density of 8.12g/cm3. What volume in pules3 (cubic pules) of this alloy will 45.9 kg occupy? Give your answer to 3 SigFigs. 1m+ 25.2 pules
90.5 pules3
What percent of bromine by mass in cobalt(II) perbromate?
46.1%
Write a molecular equation for the precipitation reaction that occurs (if any) when each pair of aqueous solutions is mixed. If no reaction occurs, write NO REACTION.
potassium carbonate and lead(II) nitrate
lithium sulfate and lead(II) acetate
copper(II) nitrate and magnesium sulfide
strontium nitrate and potassium iodide
PbCO3 (s) + 2KNO3 (aq)
PbSO4 (s) + 2LiC2H3O2 (aq)
CuS (s) + Mg(NO3)2 (aq)
NO reaction
You're planning on driving across the country with 5 friends for spring break, to a city 682 miles away( one way). Your van averages 17.3 mpg. The average cost of gasoline is $3.21 per gallon. How much will each person need to pay toward gas for the trip ( both there and back), assuming the cost is evenly divided between you and your 5 friends? Give your answer to the nearest penny.
$42.18 per person
Which of the following is/are polar?
a.) XeF2
b.) CH2F2
c.) SiF4
d.) SF4
e.) SF2
CH2F2
SF4
SF2
Calculate the de Broglie in pm of a xenon gas atom (chemical symbol: Xe) moving 308 m/s. Give your answer to 3 sig figs
9.87 pm
Calculate the total number of atoms in 83.8 ng C51H72N5O13. Give your answer to 3 significant figures.
7.39X1015 atoms
What is the sum of the coefficients for the balanced chemical reaction between aqueous sodium carbonate and aqueous hydrobromic acid?
7
What is the mass in μg of 9.18x1016 atoms of iodine (Chemical symbol: I) Give your answer to 3 sig figs
19.3 μg
A fictional element has 3 naturally occurring isotopes. The first has a mass of 57.241 amu and an abundance of 24.43%. The second has a mass of 62.223 amu and an abundance of 27.28%. The third has a mass of 65.646 amu. Calculate the atomic mass of the fictional element, giving your answer to 4 significant figures.
62.66 amu
An electron in a hydrogen atom transitions from n=3 to n=1. Find the frequency of the emitted photon in Hz. Give your answer to 3 significant figures.
2.92x1015 Hz
How many molecules are contained in 4.63 g C2H2? Give your answer to 3 significant figures.
1.07x1023 molecules
You dissolve 78g of calcium chloride in enough water to make 80 mL of stock solution. What volume of this stock solution is needed to make 823 mL of solution with a chloride ion concentration of 0.348M?
16.3 mL stock solution
A 28.50 g sample of an organic compound containing only carbon, hydrogen, and oxygen undergoes combustion analysis and produces 57.828 g CO2 and 19.727 g H2O. Find the empirical formula for the organic compound.
C6H10O3
Complete the Lewis structure below for CH3CH2COOH by adding lone pairs. Which of the following is/are true? Select all that apply.
a.) The molecular geometry around the bolded atom is trigonal pyramidal: CH3CH2COOH
b.) The molecular geometry around the bolded atom is tetrahedral: CH3CH2COOH
c.) The molecular geometry around the bolded atom is trigonal planar: CH3CH2COOH
d.) The molecular geometry around the bolded atom is linear: CH3CH2COOH
B & C