Chem tests for final

Ammonium chromate

(NH4)2 CrO4

What is the net charge of the ionic compound calcium fluoride? A. 2- B. 1- C. 0 D. 1+

0

How many pi bonds are formed when sp^2 hybridization occurs in ethene, C2H4? A. 3 B. 1 C. 2 D. 0

1

What is the charge on the action in the ionic compound sodium sulfide? A. 0 B. 1+ C. 2+ D. 3+

1+

How many valid electron dot formulas-having the same number of electron pairs for a molecule or ion-can be written when a resonance structure occurs? A. 0 B. 1 only C. 2 only D. 2 or more

2 or more

Which equation is NOT balanced? A. 2H2+O2=2H2O B. 4H2+2O2=4H2O C. H2+H2+O2=H2O+H2O D. 2H2+O2=H2O

2H2+O2=H2O

Rewrite the following word equation as a backed chemical equation (Nitrogen trifluoride=nitrogen+fluorine). What is the coefficient and symbol for fluorine? A. 6F2 B. F3 C. 6F D. 3F2

3F2

How many valence electrons are in a silicon atom? A. 2 B. 4 C. 6 D. 8

4

How many valence electrons are in an atom of phosphorus? A. 2 B. 3 C. 4 D. 5

5

What is the representative unit in a molecular compound? A. A molecule B. An ion C. A formula unit D. Shared electrons

A molecule

Determine molecules: CS2

A. Tetrahedral B. Non polar C. 180 degrees

Determine the molecules: CF4

A. Tetrahedral B. Non polar C. 109 degrees

Determine the molecules: CH2O

A. Trigonal planar B. Polar C. 120 degrees

In order to predict whether or not a single-replacement takes place, you need to consult a chart that shows the.... A. Periodic table B. Activity series of metals C. Common polyatomic ions D. Ionic charges of representative elements

Activity series or metals

After the first steps in writing an equation the equation is balanced by..... A. Adjusting subscripts to the formulas B. Adjusting coefficients to the smallest whole-number ratio C. Changing the products formed D. Making the number of reactants equal to the number of products

Adujusting coefficents to the smallest whoe-number ratio

Silver Oxide

Ag₂O

In order for the reaction 2Al+6HCl= 2AlCl3+3H2 to occur, which of the following must be true? A. Al must be above Cl on the activity series B. Al must be above H on the activity series C. Heat must be supplied for the reaction D. A precipitate must be formed

Al must be above H on the activity series

What is the formula unit of aluminum oxide? A. AlO B. Al3O C. AlO3 D. Al2O3

Al2O3

Element: Aluminum and chlorine

AlCl3; Aluminum Chloride

Most ionic compounds.... A. Are crystalline solids at room temperature B. Have low melting points C. Conduct an electric current in the solid state D. Are composed of nonmetallic elements

Are crystalline solids ar room temperature

In every balanced chemical equation, each side of the equation has the same number of... A. Atoms of each element B. Molecules C. Moles D. Coefficients

Atoms of each elements

What causes dipole interactions? A. Sharing of electron pairs B. Attraction between polar molecules C. Bonding of a covalently bonded hydrogen to an unshared electron pair D. Attraction between ions

Attraction between polar molecules

Phosphorus trichloride is an example of a.... A. Polyatomic ion B. Polyatomic compound C. Monatomic ion D. Binary compound

Binary compound

Which of the following statements is true about what happens in all chemical reactions? A. The ways in which atoms are joined together is not changed B. New atoms are formed as products C. The final substances are called reactants D. Bonds between atoms are broken and new bonds are formed

Bonds between atoms are broken and new bonds are formed

In which of the following are the symbol and name for both of the ions are given correctly? A. PO3^3-: phosphate; PO4^3-: phosphite B. C2H3O2-: acetate; C2O4^2-: oxalate C. NH4+: ammonia; H+: hydride D. OH-: hydroxide; O^2: peroxide

C2H3O2-: acetate; C2O4^2-: oxalate

Element: Calcium and Sulfur

CaS; Calcium Sulfide

Which of the following is a cation? A. Sulfate B. SO3^2- C. Ca^2+ D. Chlorite

Ca^2+

Which of the follwoing correctky represents an ion pair and the ionic compound the ions form? A. Na+, Cl-; NaCl2 B. Pb^4+, O^2-; Pb2O4 C. Ba^2+, O^2-; Ba2O2 D. Ca^2+, F-; CaF2

Ca^2+, F-; CaF2

Which molecule has a single covalent bond? A. CO2 B. Cl2 C. CO D. N2

Cl2

A double-replacement reaction takes place when aqueous cobalt (III) chloride reacts with aqueous lithium hydroxide. One of the products of this reaction is.... A. Co(OH)3 B. Co(OH)2 C. LiCo3 D. LiCl3

Co(OH)3

A reaction of a hydrocarbon, in which carbon dioxide and water are produced, is classified as a ....... reaction.... A. Decomposition B. Combustion C. Double-replacement D. Synthesis

Combustion

Molecular compounds are usually.... A. Composed of two or more nonmetallic elements B. Exceptions to the law of definite proportions C. Composed of two or more transition elements D. Composed of positive and negative ions

Composed of two or more no metallic elements

CuS

Copper(II) Sulfide

Which of the following correctly provides the name of the element, the symbol for the ion, and the name of the ion? A. Fluorine, F, fluorite ion B. Zinc, Zn^2+, zincate ion C. Copper, Cu+, cuprous ion D. Sulfur, S^2, sulfurous ion

Copper, Cu+, cuprous ion

Chemical equations.... A. Describe chemical reactions B. Show how to write chemical formulas C. Give directions for naming chemical compounds D. Describe only biological changes

Describe chemical reactions

N2O4

Dinitrogen tetroxide

The word equation for the formula equation "C2H5OH+=CO2+H2O+ energy" is.... A. Carbon dioxide + water= ethanol + oxygen + energy B. Ethanol + oxygen= carbon dioxide + water + energy C. Ethanol + oxygen + energy= carbon dioxide + water D. Ethanol + oxygen +energy= carbon dioxide + water +energy

Ethanol + oxygen= carbon dioxide + water + energy

Which of the following atoms acquires the most negative charge in a covalent bond with hydrogen? A. F B. O C. S D. Na

F

Place the following atoms in order of increasing size: Al, Cl, Mg, F, and P....

F, Cl, P, Al, Mg

In which of the following are the symbol and name for the ion given correctly? A. Sn^2+: stannic ion; Sn ^4+: stannous ion B. Fe ^2+: ferrous ion; Fe^3+: ferric ion C. Co^2+: cobalt (II) ion; Co^3+: cobaltous ion D. Pb^2+: lead ion; Pb^4+: lead (IV) ion

Fe ^2+: ferrous ion; Fe^3+: ferric ion

After the correct formula for a reactant in an equation has been written, the.... A. Symbols in the formula must not appear on the product side of the equation B. Formula should NEVER be changed C. Same formula must appear as the product D. Subscripts are adjusted to balance the equation

Formula should NEVER be changed

What does the symbol ^ above the arrow in a chemical equation mean? A. Heat is supplied to the reaction B. A catalyst is needed in the reaction C. Electricity is need in the reaction D. A precipitate will form during the reaction

Heat is supplies to the reaction

Which of the following covalent bonds is the most polar? A. H—C B. H—H C. H—N D. H—O

H—O

Sulfuric Acid

H₂SO₄

Fe2(SO4)3

Iron (III) Sulfate

How does oxygen obey the octet rule when reacting to form compounds? A. It gains electrons B. It gives up electrons C. It does not change its number of electrons D. Oxygen does not obey the octet rule

It gains electrons

How does calcium obey the octet rule when reacting to form compounds? A. It gains electrons B. It gives up electrons C. It does not change its number of electrons D. Oxygen does not obey the octet rule

It gives up electrons

Which of the following is true about an ionic compound? A. The chemical formula shows the atoms in a molecule B. The formula unit gives the number of each type of ions in crystal C. It is composed of anions and cations and yet it is electrically neutral D. The chemical formula shows the ions in a molecule

It is composed of anions and cations and yet it is electrically neutral

Element: Lithium and oxygen

Li2O; Lithium Oxide

What is the shape of a 3-atom molecule with two double bonds? A. Bent B. Tetrahedral C. Linear D. Pyramidal

Linear

Which of the following pairs of elements is most likely to form an ionic compound? A. Magnesium and fluorine B. Nitrogen and sulfur C. Oxygen and chlorine D. Sodium and aluminum

Magnesium and fluorine

Which of the following compounds contains the Mn^3+ ion? A. MnBr2 B. MnS C. MnO D. Mn2O3

Mn2O3

What is thought to cause the dispersion forces? A. Differences in electronegativity B. Motion of electrons C. Sharing of electron pairs D. Attraction between ions

Motion of electrons

Dinitrogen pentoxide

N2O5

Place the following atoms in order of increasing ionization energy: C, Na, N, Mg, and Si.......

Na, Mg, Si, C, N

What is the correct name for the N^3- ion? A. Nitrate ion B. Nitrite ion C. Nitride ion D. Nitrogen ion

Nitride ion

Which of the following correctly provides the names and formulas of polyatomic ions? A. Nitrite: NO^2-; nitrate: NO3- B. Carbonate: HCO3-; Bicarbonate: CO3^2- C. Sulfite: S^2-; sulfate: SO3- D. Chromate: CrO4-; dichromate: Cr2O7^2-

Nitrite: NO^2-; nitrate: NO3-

Under what conditions can potassium bromide conduct electricity? A. Only when melted B. Only when dissolved C. Only when it is in crystal form D. Only hear melted or dissolved in water

Only when melted or dissolved in water

Which of the following occurs in an iconic bond? A. Oppositely charged ions attract B. Two atoms share two electrons C. Two atoms share more than two electrons D. Like- hatred ions attract

Oppositely charged ions attract

A pair of molecular orbitals is formed by the... A. Overlap of two atomic orbitals from the same atom B. Reproduction of a single atomic orbital C. Overlap of two atomic orbitals from different atoms D. Splitting of a single atomic orbital

Overlap of two sromic orbitald from different atoms

In a combustion reaction, one of the reactants is..... A. Hydrogen B. Nitrogen C. Oxygen D. A metal

Oxygen

Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorous combines with oxygen gas to form diphosphorus pentoxide? A. P(s)+O2(g)=PO2(g) B. P(s)+O(g)=P5O2(g) C. P(s)+O2(g)=P2O5(s) D. P2O5(s)=P2(s)+O2(g)

P(s)+O2(g)=P2O5(s)

According to VSEPR theory, molecules adjust their shapes to keep which of the following as far apart as possible? A. Mobile electrons B. Inner shell electrons C. The electrons closest to the nuclei D. Pairs of valence electrons

Pairs of valence electrons

H3PO4

Phosphoric Acid

In the chemical equation H2O2(aq)=H2O(l)+O2(g), the O2 is a..... A. Catalyst B. Solid C. Product D. Reactant

Product

In a double-replacement reaction, the... A. Products are always molecular B. Reactants are two New Ionic compounds C. Reactants are two elements D. Products are a new element and a new compound

Reactants are two ionic compounds

A skeleton equation shows just the reactants and products whereas a balanced equation shows the... A. Approximate amounts of the reactants only B. Approximate amounts of the products only C. Products on the left, the reactants on the right D. Relative amounts of reactants and products

Relative amounts of reactants and products

What causes water molecules to have a bent shape, according to VSEPR theory? A. Ionic attraction and repulsion B. The unusual location of the free electrons C. Interaction between the fixed orbitals of the unshared pairs of oxygen D. Repulsive forces of unshared pairs of electrons

Repulsive forces of unshared pairs of electrons

When naming a transition metal ion that can have more than one common ionic charge, the numerical value of the charge is indicated by a..... A. Roman numeral following the ion name B. Roman numeral preceding the ion name C. Prefix D. Superscript after the name

Roman numeral following the ion name

Which of the following formulas represents a molecular compound? A. ZnO B. SO2 C. Xe D. BeF2

SO2

A bond that symmetrical along the axis between two atomic nuclei is a... A. Sigma bond B. Beta bond C. Alpha bond D. Pi bond

Sigma bond

The equation A+BX->AX+B is the general equation for a.......reaction. A. Double-replacement B. Decomposition C. Single-displacement D. Combustion

Single-displacement

Ionic compounds are normally in which physical state at room temperature? A. Solid B. Liquid C. Gas D. Plasma

Solid

What type of hybrid exists in the methane molecule? A. Sp^3 B. Sp C. Sp^2 D. Sp^3d^2

Sp

In which of the following is the name and formula given correctly? A. Cobaltous chloride, CoCl3 B. Barium nitride, BaN C. Sodium oxide, NaO D. Stannic fluoride, SnF4

Stannic fluoride, SnF4

Element: Strontium and bromine

Strontium Bromide

The equation A+X->AX is the general equation for a..... reaction. A. Combustion B. Ionic C. Synthesis D. Double-displacement

Synthesis

What is the basis of a metallic bond? A. The attraction of metal ions to mobile electrons B. The attraction between neural metal atoms C. The neutralization of protons by electrons D. The attraction of oppositely charged ions

The attraction of etal ions to mobile electrons

Chemical equations must be balanced to satisfy... A. The law of definite proportions B. The law of multiple proportions C. The law of conservation of mass D. Avogadro's principle

The law of conservation of mass

The chemical formula of an iconic compound shows... A. How many atoms of each element a molecule contains B. The lowest whole-number ratio between ions in the ionic compound C. Which molecules the ionic compound contains D. How the atoms bond

The lowest whole-number ratio between ions in the ionic compound

What information does a molecular formula provide? A. The number and king of atoms that are bonded by the transfer of electrons B. The simplest whole-number ratio of atoms that are bonded by the transfer of electrons C. Information about a molecules structure D. The number and kind of atoms present in a molecule

The number and kind of atoms present in a molecule

Which of the following is true about the composition of ionic compounds? A. They are formed from two or more nonmetallic elements B. They are composed of anions and cations C. They are composed of anions only D. They are composed of cations only

They are composed of anions and cations

What characteristic of metals makes them good electrical conductors? A. They have mobile valence electrons B. They have mobile protons C. They have mobile cations D. Their crystal structures can be arranged easily

Thy have mobile valemce electrons

How do atoms achieve noble-gad electron configurations in single covalent bonds? A. One atom completely loses two electrons to the other atom in the bond B. Two atoms share two pairs of electrons C. Two atoms share two electrons D. Two atoms share one electron

Two atoms share two electrons

What is the name given to the electrons in the highest occupied energy level of an atom? A. Orbital electrons B. Valence electrons C. Anions D. Cations

Valence electrons