Multiple Choice

Question 1

A solution can be distinguished from a compound by its a)liquid state b)lack of color c)variable composition d)heterogeneous nature

Answer 1

c)variable composition

Question 2

The description “two substance present, two phases present” is correct for a)heterogeneous mixture b)homogeneous mixture c)elements d)compounds

Answer 2

a)heterogeneous mixtures

Question 3

Which of the following is an element a)brass b)salt c)water d)oxygen e)earth

Answer 3

d)oxygen

Question 4

Which of the following is an element a)silver b)brass c)water d)wood e)iron ore

Answer 4

a)silver

Question 5

Which of the following is an element a)wood b)blood c)water d)iron e)none of these

Answer 5

d)iron

Question 6

In which of the following sequences of elements do each of the elements have a two letter symbol a)magnesium, nickel, phosphorus b)bromine, iron, calcium c)aluminum, copper, sulfur d)boron, barium, beryllium

Answer 6

b)bromine, iron, calcium

Question 7

In which of the following sequences of elements do each of the elements have a one letter symbol a)lead, nitrogen, zinc b)potassium, fluorine, carbon c)aluminum, copper, sulfur d)oxygen, silicon, chlorine

Answer 7

b)potassium, fluorine, carbon

Question 8

Considering the formulas CoCl2 and COCl2, which is true a)they contain the same number of elements b)are identical in meaning c)contain different numbers of atoms d)are both examples of homoatomic molecules

Answer 8

c)contain different numbers of atoms

Question 9

Which of the following statements about atoms is incorrect a)an atom is the the smallest piece of an element that can exist and still have properties of the element b)free isolated atoms are rarely encountered in nature c)atoms may be decomposed using chemical change d)only one kind of atom may be present in a homoatomic molecule

Answer 9

c)atoms may be decomposed using chemical change

Question 10

The total number of atoms present in one formula unit of Al2(SO4)3 a)14 b)15 c)16 d)17

Answer 10

d)17

Question 11

The measurement of 4.3 x 10 to the 3 grams also could be written as a) 4.3 dg b) 4.3 mg c) 4.3 kg d) 4.3 pg e) 4.3 g

Answer 11

c) 4.3 kg

Question 12

Which of the following classifications of matter could not possibly contain heteroatomic molecules a)heterogeneous mixture b)homogeneous mixture c)pure substance d)element

Answer 12

d)element

Question 13

Which of the following elements is an alkali metal a)Ca b)Sc c)Cu d)Na e)Fe

Answer 13

d)Na

Question 14

Which of the following elements is an alkaline earth metal a)Fe b)Sc c)Ca d)Cu e)Na

Answer 14

c)Ca

Question 15

Which of the following is a noble gas a)H2 b)CO2 c)O2 d)Ar e)N2

Answer 15

d)Ar

Question 16

Which of the following is a binary compound a)H2SO4 b)HCN c)H2S d)NaOH e)O2

Answer 16

c)H2S

Question 17

The shape of a p orbital is a)conical b)spherical c)dumbbell d)donut

Answer 17

c)dumbbell

Question 18

The elements chlorine and iodine have similar chemical properties because they a)are in the same chemical period b)have the same number of stable isotopes c)have the same number of electrons in their outer energy levels d) are both metals

Answer 18

c)have the same number of electrons in their outer energy levels

Question 19

All these atoms have seven electrons in their outermost energy levels except: F, H, Cl, I or Br

Answer 19

H

Question 20

If atom X forms a diatomic molecule with itself the bond is a)nonpolar covalent b)polar covalent c)polar coordinate covalent d)ionic

Answer 20

a)nonpolar covalent

Question 21

The electron configuration for Ca2+ is identical with a)Ne b)Kr c)Ar d)Ca

Answer 21

c)Ar

Question 22

Which element listed below has the electron configuration 1S2 2S2 2P6 3S2 3P4 a)S b)P c)O d)Se e)none of these

Answer 22

a)S

Question 23

1S2 2S2 2P6 3S2 3P5 is the correct electron configuration for which of the following atoms a)P b)Cl c)F d)S e) none of these

Answer 23

b)Cl

Question 24

Which of the following statements is false a)When there are two products, the order in which they are written does not matter b)There must always be a coefficient of 1 in an equation balanced in standard form c)The total number of atoms must be the same on the reactants side and the product side of a balanced equation d)The ratio of coefficients is much more meaningful than an individual coefficient in a balanced equation

Answer 24

b)There must always be a coefficient of 1 in an equation balanced in standard form

Question 25

Choose the response that best answers the question, “Why do we not change the subscripts when balancing a chemical equation?” a)We can change subscripts, just no coefficients b)We never change subscripts because atoms are neither created nor destroyed per the law of conservation of matter c)Compounds composed of the same elements and having different subscripts are different substances d)There’s no real reason not to, it’s just not done e)It’s fine to do once in a while but don’t make a habit of it

Answer 25

c)Compounds composed of the same elements and having different subscripts are different substances.

Question 26

Which of the following contains the greatest number of atoms a) 1 mole Co2 b)2 moles of He c)3 moles of N2O d)4 moles of CO

Answer 26

c)3 moles of N2O

Question 27

Which set of coefficients balances the equation C4H10 + O2 reacts to form CO2 + H2O a)1,6,4,5 b)1,7,4,5 c)1,3,4,5 d)2,13,8,10

Answer 27

d)2,13,8,10

Question 28

Which of the following is the correct equation for the combined gas law a) P2 = P1V1T1/V2T2 b) V2 = V1P2T2/P1T1 c)T2 = T1P2V1/P1V2 d) more than one correct response e) no correct response

Answer 28

e) no correct response

Question 29

The correct form of the equation for the ideal gas law is a)PV=nRT b)PT=nRV c)P/V=nrt d)PV=n/RT

Answer 29

a) PV=nRT

Question 30

In a solution the solvent is a)the substance being dissolved b)always a liquid c)the substance present in the greatest amount d)always water

Answer 30

c)the substance present in the greatest amount

Question 31

A solution may contain a)only one solvent but many solutes b)many solvents but only one solute c)only one solvent and one solute d)many solvents and many solutes

Answer 31

a)only one solvent but many solutes

Question 32

Which of the following statements concerning a saturated solution is incorrect a)undissolved solute must be present b)undissolved solute may or may not be present c)undissolved solute, if present, is continually dissolving d)undissolved solute, if present, is in equilibrium with dissolved solute

Answer 32

a)undissolved solute must be present

Question 33

The defining expression for the molarity concentration unit is a)moles of solute/liters of solution b)moles of solute/liters of solvent c)grams of solute/liters of solution d)grams of solute/liters of solvent

Answer 33

a)moles of solute/liters of solution

Question 34

Which of the following statements about solutions is correct a)a solution is a homogenous mixture b)it is possible to have solutions in which both solute and solvent are solids c)solutions readily separate into solute and solvent if left undisturbed for 24 hours d)more than one correct response e)no correct response

Answer 34

d)more than one correct response

Question 35

A crystal of solid NaCl is placed into an aqueous NaCl solution. It is observed that most, but not all, of the crystal dissolves. This means the original solution was a)supersaturated b)unsaturated c)dilute d)more than one correct response e)no correct response

Answer 35

b)unsaturated

Question 36

In which of the following pairs of properties are both members of the pair colligative properties a)density, boiling point, b)vapor pressure, osmotic pressure c)solubility, freezing point d)more than one correct response e)no correct response

Answer 36

b)vapor pressure, osmotic pressure

Question 37

Which of the following general reaction types is characterized by there being a single reactant a)combination b)decomposition c)single replacement d)double replacement

Answer 37

b)decomposition

Question 38

Combustion reactions are characterized by a)oxygen always being one of the reactants b)water always being one of the products c)carbon dioxide always being one of the products d)both reactants always being elements

Answer 38

a)oxygen always being one of the reactants

Question 39

Which of the following statements concerning redox reactions incorrect a)the oxidizing agent is the substance reduced b)the reducing agent is the substance oxidized c) the oxidizing agent loses electrons d)the substance oxidized loses electrons

Answer 39

c)the oxidizing agent loses electrons

Question 40

Most reactions are carried out in liquid solution or in the gaseous phase because in such situations a)activation energies are higher b)it is easier for reactants to come in contact with each other c)kinetic energies of reactants are lower d)products are less apt to decompose

Answer 40

b)it is easier for reactants to come in contact with each other

Question 41

The minimum combined kinetic energy reactant particles must possess in order for their collision to result in a reaction is called the a)dissociation energy b)collision energy c)activation energy d)orientation energy

Answer 41

c)activation energy

Question 42

For a system in equilibrium a)forward and reverse reaction rates are equal b)forward and reverse reaction rates are zero c)reactant and product concentrations are equal d)reactant and product concentrations are zero

Answer 42

a)forward and reverse reaction rates are equal

Question 43

Le Chatelier’s principle states that a)only exothermic reactions can reach equilibrium b)only reactions in which a catalyst is present can reach equilibrium c)if a chemical equilibrium is disturbed, the system will try and reestablish equilibrium d)if a chemical equilibrium is disturbed, the temperature of the system will always decrease

Answer 43

c)if a chemical equilibrium is disturbed, the system will try and reestablish equilibrium

Question 44

CO2 + H2 reacts to form H2O + CO What will be the effect on the equilibrium of removing CO from the equilibrium mixture? a)the equilibrium will favor the reactants side b)H2 concentration will double c)CO and CO2 concentrations will double d)H2 concentration will decrease and H2O concentration will increase

Answer 44

d)H2 concentration will decrease and H2O concentration will increase

Question 45

According to Le Chatelier’s principle which of the following changes will shift the position of the equilibrium to the left of the reaction N2 + 3H2 reacts to form 2NH3 + heat a)double the concentration of N2 b)decrease the concentration of NH3 c)increase the concentration of H2 d)triple the temperature

Answer 45

d)triple the temperature

Question 46

For a collision between molecules to result in reaction, the molecules must possess a certain minimum energy and a)exchange electrons b)interact with a catalyst for at least one second c)have a favorable orientation relative to each other when they collide d)more than one correct response e)no correct response

Answer 46

c)have a favorable orientation relative to each other when they collide

Question 47

In a redox reaction, the oxidizing agent is the substance a)that is oxidized b)that loses electrons c)that contains an element that undergoes a decrease in oxidation number d)more than one correct response e)no correct response

Answer 47

c)that contains an element that undergoes a decrease in oxidation number

Question 48

What term is used by chemists to quantitatively describe a solution in which a relatively small amount of solute is dissolved a)supersaturated b)unsaturated c)concentrated d)saturated e)dilute

Answer 48

e)dilute

Question 49

Which of the following statements about activation energy is correct a)it is the same for all reactions b)it is low for reactions that take place rapidly c)it is the maximum energy a reacting molecule may possess d)more than one correct response e)no correct response

Answer 49

b)it is low for reactions that take place rapidly

Question 50

Increasing the temperature at which a chemical reaction occurs a)will lower the activation energy b)causes more reactant collisions to take place at a given time c)increases disorder in the system, thus decreasing reaction rate d)more than one correct response e)no correct response

Answer 50

b)causes more reactant collisions to take place in a given time

Question 51

CO2 + H2 reacts to create H2O + CO Which causes the equilibrium to shift to the right a)increase the concentration of H2 b)decrease in the concentration of CO c)decrease in the concentration of CO2 d)more than one correct response e)no correct response

Answer 51

d)more than one correct response

Question 52

According to Le Chatelier’s principle which of the following effects will occur if NH3 is removed from this equilibrium mixture N2 + 3H2 reacts to form 2NH3 + heat a)concentration of N2 will increase b)heat will be generated c)concentration of H2 will decrease d)more than one correct response e)no correct response

Answer 52

d)more than one correct response