AP Chemistry 1st Semester Exam Study Guide

How many iron atoms are contained in 354 g of iron?

3.82*10^24 atoms

The outside temperature is 35°C, what is the temperature in K?

308K

Calculate the molar mass of Ca3(PO4)2

310.18 g/mol

What answer should be reported, with the correct number of significant figures, for the following calculation? (249.362+41)/63.498

4.6

Calculate the atomic mass of element "X", if it has 2 naturally occurring isotopes with the following masses and natural abundances: X-45 44.8776 amu 32.88% X-47 46.9443 amu 67.12%

46.27 amu

How many significant figures are in the measurement, 20.300 m?

5

Calculate the mass (in kg) of 4.87*10^25 atoms of Zn

5.29kg

What element is being oxidized in the following redox reaction? C3H8O2(aq) + K2Cr2O7(aq) → C3H4O4(aq) + Cr^+3(aq)

C

What element is being oxidized in the following redox reaction? MnO4^-(aq) + H2C2O4(aq) → Mn^2+(aq) + CO2(g)

C

To prevent rust, nails are coated with _______. A)Sodium B)Salt C)Zinc D)Calcium E)Lithium

C) Zinc

Determine the molecular formula of a compound that is 70.79% carbon, 8.91% hydrogen, 4.59% nitrogen, and 15.72% oxygen.

C18H27NO3

Which of the following compounds is ethanol?

C2H5OH

Which of the following is the one possible form of pentane?

C5H12

Determine the molecular formula of a compound that has a molar mass of 183.2 g/mol and an empirical formula of C2H5O2

C6H15O6

Determine the name for H2CO3

Carbonic acid

Determine the name for CoCl2*6H2O.

Cobalt(II) chloride hexahydrates

Ions differ in the number of

Electrons

Which of the following statements if false? a) the alkali metals are fairly unreactive b) Zn is a transition metal c) sulfur is a main group element d) Noble gases do not usually form ions e) Halogens are very reactive elements

a) the alkali metals are fairly unreactive

Give the formula for sulfurous acid

H2SO3

Write a balanced equation to show the reaction of sulfurous acid with lithium hydroxide to form water and lithium sulfite.

H2SO3(aq) + 2 LiOH(aq) → 2 H2O(l) + Li2SO3(aq)

What is the empirical formula for Hg2(NO3)2?

HgNo3

What element is defined by the following information? p+=11 n0=12 e-=11

Sodium

Give the name for NaHSO3

Sodium hydrogen sulfite

In a chemical reaction, matter is neither created or destroyed. Which law does this refer to?

The Law of Conservation of Mass

Identify the characteristics of a spontaneous reaction

ΔG° < 0 ΔE°cell > 0 K > 1

Determine the volume of an object that has a mass of 455.6 g and a density of 19.3 g/cm^3

23.6mL

Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C. (The equation is balanced.) Sn(s) + 2 Ag⁺(aq) → Sn2+(aq) + 2 Ag(s) Sn2+(aq) + 2 e⁻ → Sn(s) E° = -0.14 V Ag⁺(aq) + e⁻ → Ag(s) E° = +0.80 V

+0.94 V

Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C. (The equation is balanced.) 3 Cl2(g) + 2 Fe(s) → 6 Cl⁻(aq) + 2 Fe3+(aq) Cl2(g) + 2 e⁻ → 2 Cl⁻(aq) E° = +1.36 V Fe3+(aq) + 3 e⁻ → Fe(s) E° = -0.04 V

+1.40 V

Predict the charge that a calcium ion would have

+2

Predict the charge that an aluminum ion would have

+3

Use the tabulated half-cell potentials to calculate ΔG° for the following balanced redox reaction. Pb2+(aq) + Cu(s) → Pb(s) + Cu2+(aq)

+91 kJ

How many N2O4 moles of N2O4 are in 76.3 g N2O4? The molar mass of N2O4 is 92.02 g/mol.

.829 mol

Determine the volume of Hexane that contains 5.33x10^22 molecules of hexane. The density of hexane is 0.6548 g/mL and its molar mass is 86.17 g/mol.

11.6 mL

Determine the density of an object that has a mass of 149.8 g and displaces 12.1 mL of water when placed in a graduated cylinder.

12.4 g/mL

Calculate the mass percent composition of lithium in Li3PO4

17.98

What mass of silver can be plated onto an object in 33.5 minutes at 8.70 A of current? Ag⁺(aq) + e⁻ → Ag(s)

19.6 g

Write a balanced equation to show the reaction of gaseous ethane with gaseous oxygen to form carbon monoxide gas and water vapor

2 C2H6(g) + 5 O2(g) → 4 CO(g) + 6 H2O(g)

Calculate the molar mass of Al(C2H3O2)3

204.13 g/mol

How many electrons are transferred in the following reaction? (The reaction is unbalanced.) Mg(s) + Al3+(aq) → Al(s) + Mg2+(aq)

6

the molecular weight of urea ((nh2)2co) a compound used as a nitrogen fertilizer is ______ amu

60.1

How many C2H4 molecules are contained in 45.8 mg of C2H4? molar mass of C2H4 is 28.05

9.83 x 10^20 C2H4 molecules

Describe how water can be a good conductor of current

Add salt

Identify the location of oxidation in an electrochemical cell

Anode

Identify a solid

Definite volume and definite shape

Identify a liquid

Definite volume and no definite shape

Determine the name for N2O5

Dinitrogen Pentoxide

What species is represented by the following information? p+=12 n0=14 e-=10

Magnesium+2

What element is being reduced in the following redox reaction? C3H8O2(aq) + KMnO4(aq) → C3H2O4K2(aq) + MNO2(aq)

Mn

What element is being reduced in the following redox reaction? MnO4^-(aq) + H2C2O4(aq) → Mn^+2(aq) + CO2(g)

Mn

Determine the empirical formula for a compound that is 36.86% N and 63.14% O by mass.

N2O3

A student performs an experiment to determine the density of a sugar solution. she obtains the following results: 1.11g/ml, 1.81gml, 1.95g/ml, 1.75g/ml. If the actual value for the density of the sugar solution is 1.75g/ml, what is her accuracy and precision?

Neither accurate nor precise

Identify a gas

No definite volume or shape

Give the composition of water

One Hydrogen and two Oxygen. 11.19% of H and 88.81% of O

Define a salt bridge

Pathway by which ions can flow between the half-cells, completing the electrical circuit, without the solution in the half cell totally mixing

Give the name for KMnO4

Potassium permanganate

Identify the charges of the protons, neutrons, and electrons

Proton +, Neutron 0, electron -

Determine the number of protons, neutrons and electrons in the following 40X18

Proton: 18 Neutron: 22 Electron: 18

Identify the description of an atom

Protons and neutrons in nucleus, electrons in orbitals

15.10 cm

Read the length of the metal bar with the correct number of significant figures.

5.4 mL

Read the water level with the correct number of significant figures.

A covalent bond is described as

The sharing of electrons between atoms

An ionic bond is best described as

The transfer of electron form one atom to another

Give the name for SnO.

Tin (II) oxide

Determine the name for TiCO3. Remember that titanium forms several ions

Titanium (II) carbonate

Molecules can be described as

Two or more atoms joined together

Which of the following statements is false? a) the halogens tend to form 1+ ions b) metals tend to form cations c) nonmetals tend to gain electrons d) anions are resulted from their corresponding atom gaining electrons from other atoms e) atoms are usually larger than their corresponding cation

a) the halogens tend to form 1+ ions

Which of the following does not describe a metal? a) Good conductor of electricity b) tend to gain electrons c) good conductor of heat d) found on the left side of the periodic table e) form ionic compounds with nonmetals

b) tend to gain electrons

Identify the battery that is in most automobiles

lead-acid storage battery