Chemistry Final Exam

Which of the following is an alkaline earth metal?

Mg

What is the symbol of the ion having 12 protons and 10 electrons?

Mg+2

Which one of the following compounds is insoluble in water?

MgC2O4

Active metals often form a protective oxide surface film that prevents further reaction of the metal with oxygen in the air. Which one of the following formulas for the metal oxide is not correct?

MgO2 is magnesium oxide.

Which one of the following statements is not correct?

Mixtures can not be homogeneous.

Manganese(IV) oxide is a brown insoluble solid often found as a product of reactions of potassium permanganate. What is the formula of manganese(IV) oxide?

MnO2

Titanium forms different ionic oxides. One, TiO2, is a white oxide used in paints. What is the proper name for TiO2?

titanium(IV) oxide

Which of the following represents a physical property of water?

water boils at 100°C.

Which one of the following is not a chemical reaction?

water turning to steam

Which one of the following acids has an incorrect formula or is not named correctly?

H2SO3, sulfuric acid

Sulfur combines with oxygen and hydrogen to form two acids. Sulfuric acid has the formula ________, and sulfurous acid has the formula ________.

H2SO4, H2SO3

Aqua regia is a mixture of hydrochloric acid and nitric acid that is capable of dissolving gold. What are the formulas of these acids?

HCl, HNO3

Which one of the following acids has an incorrect formula or is not named correctly?

HNO2, nitric acid

Which represents an intensive property?

Hydrogen gas has a given density

Which statement is not correct?

In an atom, the interaction between electrons and neutrons is repulsive

At what temperature do the Celsius and Fahrenheit scales read the same?

-40°

For each of the elements below, there are only two naturally occurring isotopes. Using information in your periodic table, identify the pair in which the heavier isotope is the more abundant one.

10B and 11B

A 35, 17Cl atom has ________ protons, ________ neutrons, and ________ electrons.

17,18,17

Which of the following atoms contains the least number of neutrons?

27Al

If the following operations are carried out, how many significant figures should be reported in the answer? 213 - 0.32 + 2.3 - 57.432

3

The sixth period of the periodic table contains ________ elements.

32

The measurement 54.40 meters contains ________ significant figures.

4

For each of the elements below, there are only two naturally occurring isotopes. Using information in your periodic table, identify the pair in which the lighter isotope is the more abundant one.

79Br and 81Br

A 16 8O2- ion has ________ protons, ________ neutrons, and ________ electrons.

8,8,10

Molecules are represented in various ways. Which statement A-D about molecular representations is not correct.

A molecular or chemical formula identifies the elements and the number of atoms of each that comprise a molecule of a compound. A structural formula shows how the atoms are bonded together but does not necessarily indicate the bond angles or three-dimensional shape of the molecule. A ball-and-stick model shows bond angles and the three-dimensional shape of a molecule. A space-filling model best represents the size of the atoms and distribution of electrons in a molecule.

An unknown element is found to contain isotopes with the following masses and natural abundances: 38.9637 amu (93.08%), 39.9640 amu (0.012%), and 40.9618 amu (6.91%). Using these data, identify the element.

K

Identify the binary compound that has ionic bonding.

LiF

The formula for a lutetium carbonate compound is Lu2(CO3)3. What would be the formula for a lutetium nitrate compound given that the charge of lutetium is the same in both compounds?

Lu(NO3)3

Which of the following mixtures can be separated by filtration?

sand and water

Which statement below is not correct?

silicon is a nonmetal

When you place a piece of dry ice (solid carbon dioxide) on a plate at room temperature, you notice that no liquid forms, unlike ice that melts to form liquid water. This is because dry ice ________

sublimes instead of melting

Which of the following is a pure substance?

sucrose (table sugar)

Which one of the following is not a correct statement?

sugar dissolved in water is a heterogeneous mixture.

The elements below are used in fireworks. Which one is not classified correctly according to its position in the periodic table?

sulfur is a metalloid

Which one of the following is not classified correctly?

table salt (sodium chloride) is a mixture.

Which one of the following experiments provided evidence that atoms contained small massive nuclei with positive charges?

the Rutherford Geiger Marsden experiment

Which of the following is an element?

Cl2

Which one of the following ionic compounds has an incorrect formula or is not named correctly?

CoO, cobalt oxide

Locate each element in the periodic table and identify which statement is not correct. The common ion of ________ has ________ electrons and a charge of ________.

Cs, 55, +1

Identify the statement regarding H2, He, and NH3 that is correct.

H2 and He are chemical elements

Which statement is not correct? In atomic mass units (amu or u), ________

the mass of an electron, proton, or neutron is approximately 1 u.

The formula for a terbium phosphate compound is Tb3(PO4)4. What would be the formula for a terbium sulfate compound given that the charge of terbium is the same in both compounds?

Tb(SO4)2

Combustion analysis of an organic compound to determine the percentages of carbon, hydrogen, and oxygen in the compound depends on which of the following assumptions?

The compound burns completely to form carbon dioxide and water.

Which statement about a balanced chemical reaction equation is always correct?

The number of atoms of each kind is the same for the products as for the reactants.

When are an empirical formula and a molecular formula the same?

When the mass of the empirical formula unit is equal to the molecular mass

Zinc oxide is found in ointments for the skin. What formula best describes this compound, which has Zn as a doubly charged cation?

ZnO

Indicate which of the following common laboratory devices will deliver 25 mL of a solution with the greatest precision.

a 25 mL volumetric pipette (with a to-deliver error of 0.01 mL at 25°C)

Which one of the oxoacid formulas and names is not correctly matched?

all are correct

Which anion is not labeled correctly?

all are labeled correctly

Which one of the following is a mixture?

an aqueous solution of sugar

Extensive properties are ________

dependent on the amount of substance present

During winter in Siberia, a tenant in a high-rise apartment building dumped a liter of steam (gaseous water) from a container off his balcony. Before it reached the ground, solid snow formed without observation of liquid water. The phase transition described by this process is called ________.

deposition

Which one of the following is not a physical property?

flammability

Which statement A-D about the reaction of methane with oxygen, which is called combustion and is represented by the reaction equation below, is not correct? The reaction products are carbon dioxide and water. CH4 + 2O2 → CO2 + 2H2O

four atoms of hydrogen combine with four atoms of oxygen to produce water.

Which of the following is not a chemical property of chlorine?

freezing occurs at -102 ºC.

Elements in group 17 (VIIA) are called ________

halogens

Orange juice with pulp is an example of ________

heterogeneous mixture

What is the correct name for FeCl3?

iron (III) chloride

1H, 2H, and 3H are examples of ________ because they have different numbers of ________.

isotopes, neutrons

Sodium does not occur in nature as Na (s) because ________.

it is easily oxidized to Na+

Which of the following is the SI base unit for mass?

kg

Aqueous potassium chloride will react with which one of the following in an exchange (metathesis) reaction?

lead nitrate

Which one of the following statements is not correct?

liquid water turning into steam is a chemical reaction.

Based on its position in the periodic table, which atom would you predict to form a compound with one chlorine atom?

lithium

Dalton s law of multiple proportions deals with ________

the relative masses of two elements that can combine to form two or more compounds

Which statement about isotopes of the same element is not correct?

they have the same atomic mass

Which one of the following statements is not consistent with Dalton s atomic view of matter?

Atoms of one element can be converted into atoms of another element.

Identify the incorrect statement(s). A pure substance can be ________ I. an element or a compound. II. heterogeneous or homogeneous. III. a solution.

Both II and III are incorrect.

Which one of the following is a molecular compound? Molecular compounds also are known as covalent compounds.

CCl4

Which polyatomic ion is not labeled correctly?

CN- cyanate

Which of the following is most likely to exhibit covalent bonding?

CO2

Based on the element s position in the periodic table, which statement below is not correct?

Ca 2+ has more electrons than Ar.

Which one of the following is a cation?

Ca+2

Which statement is correct?

Electrons have a much smaller mass than that of protons and neutrons

Which one of the following statements is not correct?

Elements occur only in the form of individual atoms.

Which statement about the following chemical reaction is not correct? 3H2 + N2 −−> 2NH3

For every two moles of nitrogen consumed, three moles of ammonia are produced.

What is the correct formula for the compound formed between sodium and iodine based on their positions in the periodic table?

NaI

Sodium nitrite, which is used in meat processing, has been implicated as a possible health hazard because it can react with amines present in meat to form trace quantities of carcinogenic nitrosamines. What is the formula of sodium nitrite?

NaNO2

Which combination will produce a precipitate?

NaOH (aq) and Fe(NO3)2 (aq)

Identify the incorrect statement(s). A solution ________ I. can be a solid, liquid, or gas. II. can be heterogeneous or homogeneous. III. is a homogeneous mixture.

Only II is incorrect.

Dalton's law of multiple proportions can be applied to ________

PF3 and PF5

Which combination will produce a precipitate?

Pb(NO3)2 (aq) and HCl (aq)

Which statement A-D about accuracy and precision is not correct?

Precision refers to the reproducibility of repeated measurements. Accuracy refers to how close a measured value is to the true value. It is possible for measurements to be precise but not accurate. Accuracy is determined by comparison with some standard.

Radium often is found in uranium ores and can be separated from solutions by precipitation as radium sulfate. What is the formula for radium sulfate?

RaSO4

Which statement below is not correct?

Silicon is a non metal

Which of the following is not a base SI unit?

cm

What is the proper name for Co(ClO4)3?

cobalt (III) perchlorate

Which of the following processes is a chemical reaction?

combustion

A gas forming a liquid is called ________.

condensation

Which of the following represents a chemical property of copper metal?

copper metal reacts with nitric acid to produce copper(II) nitrate

A solid forming a liquid is called ________.

melting

Potassium is best described as a ________

metal

Which one of the following is not a physical process or change?

natural gas is burning

Based on its position in the periodic table, which atom would you predict to form a compound with three lithium atoms?

nitrogen

With which of the following will the ammonium ion form an insoluble salt?

none of the above

Oxygen is best described as a ________

nonmetal

In the atoms in the Rutherford Geiger Marsden experiment, the alpha particles were repelled by ________

nuclei

Table sugar (sucrose) with the formula C12H22O11 is ________ I. an element. II. a compound. III. a mixture.

only II

With which ion will the mercury ion form an insoluble salt?

phosphate