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