Chemistry 1 comprehensive questions
What is the concentration (M) of a NaCl (MM: 58.46 g/mol) solution prepared by dissolving 18.6 g of NaCl in sufficient water to give 350 mL of solution
0.9
How many molecules are there in 104.12 g of carbon dioxide? Avogadro's number is 6.023 x 10^23
1.424 x 10^23
Convert 63°F to C
17
Given the following reactions N2 (g) + O2 (g) → 2NO (g) ΔH = +180.7 kJ2 N2O (g) → O2 (g) + 2N2 (g) ΔH = -163.2 kJ The enthalpy of reaction for 2 N2O (g) → 2NO (g) + N2 (g) is _________ kj
17.5
33) The ground state electron configuration of Ga is _______
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1
How many moles of gas are there in a 50.0 L container at 22.0°C and 825 torr?
2.23
A sample of a gas originally at 25°C and 1.00 atm pressure in a 2.5 L container is subject to apressure of 0.85 atm and a temperature of 15°C. The final volume of the gas is __________L.
2.8
10.0 grams of argon and 20.0 grams of neon are placed in a 1200.0 ml container at 25.0°C. The partial pressure of neon is __________ atm
20.4
What volume (mL) of a concentrated solution of sodium hydroxide (6.00 M) must be diluted to 200.0 mL to make a 0.880 M solution of sodium hydroxide?
29.3
3) Balance the following reaction. What coefficient goes in front of O2(g)? C2H4O (g) + O2 (g) → CO2 (g) + H2O (g
3
An electron cannot have the quantum numbers n = __________, l = __________, ml = __________
3, 2, 3
The value of ΔH° for the reaction below is -72 kJ. __________ kJ of heat are released when 80.9 grams of HBr is formed in this reaction? H2 (g) + Br2 (g) → 2HBr (g)
36
How many quantum numbers are necessary to designate a particular electron in an atom?
4
The molecular weight of the ethanol (C2H5OH), rounded to the nearest integer, is __________ amu
46
In which orbital would an electron (on average) be farthest to the nucleus?
4f
The density of lead is 11.4 g/cm3. The mass of a lead ball with a radius of 0.50 mm is __________ g
6.0 x 10^-3
A 13.8 mL aliquot of 0.176 M H3PO4 (aq) is to be titrated with 0.110 M NaOH (aq). What volume (mL) of base will it take to reach the equivalence point?
66.2
The temperature of a 35.2 g sample of iron increases from 23.7 °C to 29.5 °C. If the specific heat of iron is 0.450 J/g-K, how many joules of heat are absorbed?
92
There are __________ protons, __________ neutrons, and __________ electrons in 238U +5
92, 146, and 87
Using the appropriate number of significant figures, circle the most appropriate answer for thecalculation below: (Hint: 4 and 2 are exact whole numbers!)(4 × 15.9994) + 32.066 + (2 × 1.0079)
98.079
Which element is REDUCED in the following reaction? Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s)
Ag
What is the correct formula for aluminum sulfate
Al2(SO4)3
What best describes a net ionic equation?
An equation that only shows the species that participate in a reaction
A compound that is composed of carbon, hydrogen, and oxygen contains 70.6% C, 5.9% H, and 23.5% O by mass. The molecular weight of the compound is 136 amu. What is the molecular formula?
C8H8O2
Of the molecules below, only __________ is non polar
CO2
The net ionic equation for the reaction between aqueous nitric acid and aqueous sodium hydroxide is
H+ (aq) + OH- (aq) → H2O (l)
A combination of sand, salt, and water is an example of a ________
Heterogenous mixture
Of the following, which gives the correct order for atomic radius for Mg, Na, P, Si and Ar?
Na > Mg > Si > P > Ar
Write the formula for sodium chlorite
NaClO2
Which statement is true about kinetic molecular theory?
The average kinetic energy of the gas molecules is proportional to temperature
Of the possible bonds between carbon atoms (single, double, and triple), _________
a double bond is longer than a triple bon
Molecular Orbital theory correctly predicts diamagnetism of fluorine gas, F2. This is because__________
all electrons in the MO electron configuration of F2 are paired.
In general, as you go across a period in the periodic table from left to right: (1) the atomic radius __________; (2) the electron affinity becomes __________ negative; and (3) the first ionization energy _________
decreases, increasingly, increases
The basis of the VSEPR model of molecular bonding is _________
electron domains in the valence shell of an atom will arrange themselves so as to minimize repulsions
A anion is defined as an atom that has_________
gained an electron
Accuracy refers to _________
how close a measured number is to the true value
6) The uncertainty principle states that _________
it is impossible to know the exact position and momentum of an electron
Electrons in the 1s subshell are much closer to the nucleus in Ar than in He due to the larger __________ in Ar
nuclear charge
A typical triple bond consists of _________
one sigma and two pi bond
Based on the octet rule, phosphorous most likely forms a __________ ion.
p3-
What is the name for H3PO4?
phosphoric acid
Isotopes are atoms that have the same number of __________ but differing number of __________
protons, neutrons
5) The photoelectric effect is __________
the ejection of electrons by a metal when struck with light of sufficient energy
What best describes a limiting reactant?
the reactant that is completely consumed
Given the data in the table below, ΔH°rxn for the reaction C2H5OH (l) + O2 (g) → CH3CO2H (l) + H2O (l) is ________kj
-492.6
How many moles of magnesium oxide are produced by the reaction of 3.82 g of magnesium nitride with 7.73 g of water? (Hint: one of the reactants might be limiting) Mg3N2 + 3 H2O → 2NH3 + 3Mg
0.114
