Chemistry Final All old tests, quizzes, practice tests

The oxidation state of selenium in NaSeO3 is+5

+5

The oxidation state of chlorine in ClO4- is

+7

How many ions are represented by the formula CBr4?

0

The oxidation state of an element in its elemental state is

0

How many moles are in a 12.0 g sample of iron (II) oxide which has the formula FeO?

0.167 mole FeO

A given set of s orbitals consists of ______________ orbital(s).

1

Which represents the smallest mass?

1.0 mol Al

What is the mass of 0.015 moles of Ca(OH)2?

1.1 g Ca(OH)2

A d sublevel can hold a maximum of

10 electrons

What is the mass of 0.95 mol of K2S?

105 g

The molar mass of Na2CO3 is: The atomic masses are: Na = 23.0, C = 12.0, and O = 16.0

106.0 g/mol.

What is the molar mass of calcium chloride (CaCl2)?

111.1 gCaCl2 / 1 moleCaCl2

The electron configuration for the phosphorus atom is

1s22s22p63s23p3

The correct electron configuration for Mn is

1s22s22p63s23p64s23d5

A sulfur atom needs to gain ______________ electrons to achieve a noble gas configuration.

2

Answer the following question(s) that refer to the unbalanced reaction shown below as it occurs in acidic solution: _______ Cr2O72- (aq)+ _______ I-(aq)-> _______ Cr3+(aq) + _______ I2(s) Determine the coefficient for the Cr3+ ions.

2

When the following equations are balanced, what is the coefficient of the underlined species? Br2(l) + KI(aq) -> I2(aq) + KBr(aq)

2

When the following equations are balanced, what is the coefficient of the underlined species? MgO(s) -> Mg(s) + O2(g)

2

When the following equations are balanced, what is the coefficient of the underlined species? Na(s) + H2O(l) -> NaOH(aq) + H2(g)

2

A given set of p orbitals consists of ______________ orbital(s).

3

How many ions are represented by the formula Li2CO3?

3

When the following equations are balanced, what is the coefficient of the underlined species? Al(s) + O2(g) -> Al2O3(s)

3

How many silver (Ag) atoms are contained in 0.650 grams of silver?

3.63 * 10²¹

A 9.56 g sample of CuS is found to contain 6.35 g of copper. What is the percent by mass of the copper and sulfur in this compound?

336% Cu

What is the percent by mass of Ca in calcium chloride (CaCl2)?

36.1%Ca

The maximum number of electrons allowed in each of the d orbitals is

4

The number of unpaired electrons in a Fe atom is

4

What mass of calcium metal contains the same number of atoms as 24.3 g of magnesium?

40.1 g

A given set of d orbitals consists of ______________ orbital(s).

5

Which of the following contains the largest number of molecules?

5.0 g H2

Which represents the least number of atoms?

50.0 g Zn

Answer the following question(s) that refer to the unbalanced reaction shown below as it occurs in acidic solution: _______ Cr2O72- (aq)+ _______ I-(aq)à _______ Cr3+(aq) + _______ I2(s)

6

How many atoms are represented by the formula Li2CO3?

6

Answer the following question(s) that refer to the unbalanced reaction shown below as it occurs in acidic solution: _______ Cr2O72- (aq)+ _______ I-(aq)-> _______ Cr3+(aq) + _______ I2(s)

7

The number oxygen atoms represented by the formula Pb(C2O4)2 is

8

Which of the diagrams below best represents a particle of aluminum carbonate which has the formula Al2(CO3)3? PICTURE

9 green oxygen dots, 3 red carbon dots, 2 blue aluminum dots

Which of the above would you expect to have the lowest melting point?

All blue picture

In which of the following is the 2nd level completely filled?

All of these choices have a completely filled 2nd level. Na Mg Al Ar

What element has the electron configuration 1s22s22p63s23p6?

Ar

What is the correct formula unit for the compound named barium nitrate?

Ba(NO3)2

What is the empirical formula of an oxide of bromine which contains 71.4% bromine?

BrO2

Which of the following has a double bond?

C2H4

Given the diagram below of a compound composed of only carbon and hydrogen, what is the molecular formula for the compound? PICTURE: Three red dots, 7 blue dots

C2H6

Which of the following has the empirical formula CH3?

C2H6

The empirical formula of a compound is CH2O, and its mass is 90 amu/molecule. Calculate its molecular formula.

C3H6O3

Given the diagram below of a compound composed of only carbon and hydrogen, what is the empirical formula for the compound? PICTURE: Three red dots, 7 blue dots

CH3

Which of the following compounds contains one or more covalent bonds?

CO2

Which element or ion listed below has the electron configuration 1s22s22p63s23p6?

Ca2+

Calcium reacts with fluorine to form

CaF2

Identify the following compounds as ionic (a) or molecular (b).

CaI2= ionic SO3= molecular Mg(NO2)2= ionic ZnCO3= ionic CS2= molecular silver chromate= ionic carbon tetrachloride= molecular copper (II) nitrate= ionic iron (III) bromide= ionic sodium phosphate= ionic

Which of the following pairs of atoms or ions are isoelectronic, i.e. they have the same number of electrons in the same electronic configuration.

Cl-, Ar

The Lewis structure for which of the following contains the greatest number of lone pairs of electrons?

F2

1s22s22p63s23p64s23d6is the electron configuration for which of the following atoms?

Fe

All these atoms have seven electrons in their outermost energy levels except

H

NH4+ has the Lewis dot structure:

H .. H : N : H .. H

Which of the following contains only non-polar bonds:

H2

Which of these is not an ionic compound?

H2Te

Match the ion formula with the ion name

Mg2+= magnesium ClO3-= chlorate Cd2+ =cadmium (II) NO3-= nitrate NH4+= ammonium Cl-= chloride Sn4+= tin(IV)

Which of the following compounds contains an ionic bond?

MgCl2

Magnesium reacts with oxygen to form

MgO

Which of the following has the electron configuration 1s22s22p63s23p64s23d5?

Mn

Which gas has the lowest molar mass?

Ne

Which one of the following atoms has a partly filled d sublevel?

Ni

Which of the following has a double bond?

O2

Calculate the relative mass of each coin as compared to the lightest using the data table below. Dime= 2.30 g (A) Nickel=5 g (B) penny= 2.50 g (C) quarter=5.66 g (D)

Relative Mass A= 1.00 Relative Mass B= 2.17 Relative Mass C= 1.09 Relative Mass D= 2.46

1s22s22p63s23p6 is the electron configuration for which one of the following ions?

S2-

The element with the electron configuration [Kr]5s24d105p3 is

Sb

For the compound with the formula NH4ClO3, select all statements below that are true.

The NH4 part of the formula represents a positive ion. The ClO3 part of the formula represents a negative ion. The compound has a net neutral charge. The compound is ionic. All the ions in the compound are polyatomic. There are 2 ions in the compound.

Is it possible for a non-polar molecule to contain polar bonds? (note - the reason must be correct on this one)

Yes - if the polar bonds are arranged in space such that their individual electric fields cancel out

What is the correct electron configuration for the iron (III) ion?

[Ar]3d5

Unit 8

_________

Unit 5

____________

unit 7

________________

Unit 6

__________________

A packet of energy of electromagnetic radiation is called

a photon

The smallest unit of Hf is an example of a(n)

atom

"Empirical" means

based on experimental evidence.

Which of the following substances would you expect to conduct electricity?

bleach (a solution of sodium hypochlorite, NaOCl, in water)

What is the name of the compound CBr4?

carbon tetrabromide

Which gas has the highest mass per mole?

chlorine

J.J. Thomson

concluded that atoms contained mobile particles with a (-) charge

A chemical mole

contains 6.02 x 1023 particles

In the Electrolysis Lab, we concluded that copper ions have a (+) charge because the experimental evidence showed that

copper metal formed on the negative electrode

When they react chemically, the alkali metals (Group 1)

gain one electron

Which of the above would you expect to have the highest melting point? PICTURE

green and purple picture

In the reaction 2Ca(s) + O2(g) à 2CaO(s), calcium is ______________.

oxidized

Below left is group of atoms of aluminum foil and a (+) tape . Which diagram best represents how the electrons would be arranged if a (+) tape were placed close to the right of the sample of aluminum foil? PICTURE

picture with dots most spread apart in the atoms

Below left is group of atoms of paper and a (+) tape . Which diagram best represents how the electrons would be arranged if a (+) tape were placed close to the right of the sample of paper? PICTURE

picture with dots most spread apart in the atoms

When electrons are shared unequally, chemists characterize these types of bonds as ______________.

polar covalent

In the hydrogen chloride (HCl) molecule, the atoms are held together by a(n)

polar covalent bond

In the Sticky Tape Lab, we determined the top piece of tape was:

positive, because it was attracted to the plastic rod, which was defined as having negative charge.

Which of the following has a molecule as its smallest repeating particle? PICTURE

red and grey picture

What is the name of the compound Na2CO3?

sodium carbonate

Match the ion name with the ion formula.

sodium= Na+ calcium= Ca2+ aluminum= Al3+ phosphate= P3- copper(II)= Cu2+ iodide= I− sulfide= S2-

Which of the following is not true about one mole?

the mass of 1 mole of carbon atoms = the mass of 1 mole of boron atoms

In the zinc chloride lab, if eight pieces of zinc had been used in the reaction rather than four, the ratio of zinc to chloride

would remain the same