Adam
Classify the following molecules as covalent or ionic and name them:
CCl4
SnO2
NH4Cl
Covalent - carbon tetrachloride
Ionic - tin (IV) oxide
Ionic - ammonium chloride
A balloon has one mole of methane(CH4) and another ballon has one mole of oxygen gas. Which will weigh more?
The balloon with one mole of oxygen gas
Identify each of the following as a chemical or physical change:
Milk turning sour
Boiling water
Heating sugar until it becomes caramel
Baking a cake
Shredding paper
Chemical Change
Physical Change
Chemical Change
Chemical Change
Physical Change
Identify the acid, base, conjugate acid, and conjugate base in the following equation:
NH3 + H2O => NH4+ + OH-
NH3 - base
H2O - acid
NH4+ - conjugate acid
OH- - conjugate base
What are five variables that can make a chemical reaction go faster?
Surface Area, Catalyst, Temperature, Pressure, and Concentration
Order the following elements from least to highest ionization energy, and least to highest atomic radius
Helium, Carbon, Neon
Ionization energy - Carbon, Neon, Helium
Atomic radius - Helium, Neon, Carbon
If a non flexible container is filled with oxygen gas, and then undergoes a decrease in temperature, what happens to the internal pressure? What if the container was flexible?
The internal pressure would go down. If it was a flexible container, the volume would go down and the internal pressure would remain constant.
Balance the following equations if necessary and classify them as synthesis, decomposition, single replacement, double replacement, or combustion:
Fe(s) + CuCl2(aq) => Cu(s) + FeCl2(aq)
C3H8(g) + O2(g) => CO2(g) +H2O(g)
CaCO3(s) => CaO(s) + CO2(g)
Fe(s) + CuCl2(aq) => Cu(s) + FeCl2(aq)
Single Replacement
C3H8(g) + 5O2(g) => 3CO2(g) +4H2O(g)
Combustion
CaCO3(s) => CaO(s) + CO2(g)
Decomposition
Name the following acids:
H+ + N3- = H3N
H+ + NO3- = HNO3
H+ + NO2- = HNO2
Hydronitric Acid
Nitric Acid
Nitrous Acid
Classify the following reactions as exothermic or endothermic:
Melting ice
Forming bonds
CaCl2 + H2O => energy + 2HCl + CaO
Endothermic
Exothermic
Exothermic
Determine the molecular geometry of an SiH4 molecule and identify if the molecule is polar or nonpolar and the most significant intermolecular force present.
Tetrahedral
Non-polar
Dispersion
A sample of Chlorine gas occupies a volume of 3.5 L at a pressure of 15 psi. After undergoing an increase of pressure, the new volume is 2.5 L. What must the new pressure be?
21 psi
Use the following equation to answer the question: 2KClO3 => 2KCl + 3O2
How many moles of oxygen will be produced from 50 grams of KClO3?
0.612 moles of Oxygen
Write out the chemical formula for the following acids:
Carbonic Acid
Hydroiodic Acid
Sulfurous Acid
H2CO3
HI
H2SO3
In an exothermic reaction, which direction of the reaction is benefited by an increase in temperature?
Reverse
In a sample of Lithium, 30 atoms are Li-6 and 370 atoms are Li-7. Calculate the percent abundance for each of the isotopes and then calculate the average atomic mass of lithium.
Li-6 7.5% Li-7 92.5%
6.925 g/mol
Two balloons are filled with gas at the same volume, temperature, and pressure. One is filled with neon and the other helium.
Which balloon has more moles of gas?
Which balloon weighs more?
Which balloon will deflate faster?
They have the same moles of gas
The balloon with neon weighs more
The balloon with helium will deflate faster
In this oxidation-reduction reaction, identify the element being oxidized and the element being reduced: Fe2O3 + 3CO => 2Fe + 3CO2
Fe was reduced and C was oxidized
A solution has a pH of 4.56. Is it an acid or a base? Identify the [OH-], pOH and [H+] values.
The solution is a acid.
[OH-]= 3.631*10-10
pOH = 9.44
[H+]= 2.754*10-5
A 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature increases from 25°C to 175°C. Calculate the specific heat of iron.
0.46 J/g*°C
Polonium-208 undergoes an alpha decay. Write out the equation for this process.
208/84 Po => 4/2 He + 204/82 Pb
How many grams of Argon gas (Ar) are contained in a 500-mL tank at 328°C, with a pressure of 0.57 atm?
0.23 grams
Balance this equation and then answer the following question:
Na(s) + Fe2O3(s) => Na2O(s) + Fe
How many grams of Iron can be produced with 45 grams of Iron (III) Oxide and excess Sodium?
6Na(s) + Fe2O3(s) => 3Na2O(s) + 2Fe
31.47g of Iron
26.2 mL of 0.2M Ca(OH)2 is used to neutralize 25 mL of hydrofluoric acid. What is the concentration of HF? (Hint: begin by writing out and balancing the chemical equation) M=moles/liters
.4192 M
A 1.50-g sample Sodium Perchlorate (NaClO4) decomposes and the energy is applied to a 175 g sample of water at 25.0°C. The sample of water rises to a final temperature of 35.5°C. What is molar heat of the solution?