CHEM115 Midterm review 2 Flashcards

The formula for ammonium chloride is ___.

a. AlCl₃

b. NH₄Cl

c. NCl

d. AmCl

The name of the compound Na₂CO₃is

a. sodium carbonate.

b. disodium carbonate.

c. sodium bicarbonate.

d. disodium bicarbonate.

Helium forms an ion with a 2+ charge.

True

False

SO₃ ^2- is called the sulfur trioxide ion.

True

False

Which is the appropriate description ofSr²⁺?

a. This is an atom and can be used to form chemical compounds.

b. This is an atom with a charge of +2 because there are more neutrons than protons.

c. This is an ion with a charge of +2 because there are two more protons than electrons.

d. This is an ion with a charge of +2 because there are more electrons than protons.

Which of the following is an anion?

a. F

b. Al³⁺

c. Mg

d. I^-

Sodium carbonate is an ionic compound whose formula is NaCO₃.

True

False

Nitrogen can have an anion, N^3-. This ion

a. is the result of the atom gaining three electrons.

b. can form three ionic bonds.

c. has eight electrons in the outside orbit.

d. All of these choices are correct.

A compound commonly called trisodium phosphate, Na₃PO₄, is used to clean grease and other organic materials from concrete surfaces. Calculate the formula weight of this cleaner.

a. 70.20 amu

b. 116.70 amu

c. 118.30 amu

d. 164.00 amu

How many protons and electrons does Mg²⁺have?

a. 12 protons and 12 electrons

b. 12 protons and 14 electrons

c. 14 protons and 12 electrons

d. 12 protons and 10 electrons

The name of the compound N₂O₄is

a. nitrogen oxide.

b. nitrogen tetroxide.

c. dinitrogen tetroxide.

d. nitrogen dioxide.

What is the mass in grams of 3 moles of calcium carbonate, CaCO₃, a common antacid?

a. 300 grams

b. 150 grams

c. 100 grams

d. 68 grams

What is the proper name of the compound N₂O₃?

a. nitrate

b. nitrogen(II) oxide

c. nitrogen trioxide

d. dinitrogen trioxide

Chose the formula of cobalt(II) nitrate.

a. CoN

b. Co₂ NO₃

c. Co(NO₃)₂

d. Co_(II)(NO₃)₂

The proper name for P₂O₅is

a. acetate

b. hydrogencarbonate (bicarbonate)

c. carbonate

d. cyanide

A Roman numeral is used in the name of transition metal ions. That numeral indicates the charge of the ion.

True

False

Aluminum sulfate, Al₂(SO₄)₃, can be used in water purification. What is the formula weight of this salt?

a. 75.10 amu

b. 342.30 amu

c. 315.30 amu

d. 150.10 amu

A compound is

a. two or more elements well mixed.

b. two or more elements combined chemically.

c. two or more elements carrying a positive charge.

d. a physical blend of two or more elements.

What is the formula of beryllium sulfide?

a. BeS

b. Be₂S

c. Be₂S₃

d. Be₃S₂

Serotonin is a molecule involved in the transmission of nerve impulses. One of the organic families present in serotonin is ___.

a. ester

b. alkyne

c. phenol

d. aldehyde

The correct condensed structure of Propylene glycol, a compound used as a solvent for drugs is

a. CH₃CH₂CH₂OH

b. CH₂HOHCOH₂COHc.

CH3

c. CH3-CH-OH

CH3

d. CH3-CH-OH

Which of the following organic families is present in the molecule provided below?

a. ether

b. ketone

c. aldehyde

d. phenol

Which atoms in the following molecule would have δ^-charge based on the electronegativities of the elements?

a. H and O

b. O and C

c. C and N

d. N and O

Hydrocarbons can take part in dipole-dipole interactions.

True

False

The following molecule belongs to which family of compounds?

a. alcohols

b. Ethers

c. sulfides

d. Thiols

Which of the following contains a nonpolar covalent bond?

a. LiBr

b. CaCl₂

c. H₂O

d. O₂

Which of the following molecules is polar?

a. H₂CO (hint: C is the central atom)

b. CH₄

c. N₂

d. BCl₃(hint: B is the central atom and doesn’t have an octet)

The ability of an atom in a molecule to attract bonding electrons to itself is its ___.

a. polarity

b. electronegativity

c. ionic nature

d. bonding character

The Si-Si bond in Cl₃SiSiCl₃ is expected to be polar.

True

False

Which molecule has a linear geometry?

a. SO₂

b. H₂O

c. OF₂

d. CO₂

The greater the difference in electronegativity of the atoms involved, the more polar the covalent bond.

True

False

Organic compound must contain which of the following atoms?

a. O

b. H

. S

d. C

he kinds of interactions that exist between CH₃COOH molecules include dipole-dipole (including hydrogen bonding) interactions and London forces

True

False

Which of the following statements is (are) true about hydrogen bonding interaction?

a. It occurs only in molecules that contain H bonded to a highly electronegative atom, such as N, O, or F.

b. It is a special type of dipole-dipole interaction.

c. It is present in H₂O.

d. All of these choices.

Which pairs of molecules can form a hydrogen bond with one another?

a. NF₃

b. CH₃CH₂CH₂CH₂CH₃

c. CH₃CH₂NH₂

d. CCl₄

Which bond is least polar?

a. H-F

b. H-Cl

c. H-Br

d. H-I

The molecule CH₄ has a tetrahedral shape. The angle between the bonds in CH₄ is approximately ___.

a. 104.5°

b. 109.5°

c. 90°

d. 120°

Choose the type of shape from Column 2 that best matches each item in Column 1.

CO_{2 - Linear}

NH_{3 pyrmidal}

CH₂O Tetrahedral

SO_{2 Bent}

Which atoms in the following molecule would have δ^-charge based on the electronegativities of the elements?

a. H, C, and O

b. N, O, and S

c. C and N

d. N, S, and C

The name for the Ti⁴⁺ion is

a. Tin ion.

b. Tin (IV) ion.

c. Titanium ion.

d. Titanium (IV) ion.

Generally, the octet rule works fairly well for predicting the behavior of atoms. However, there is an exception:

a. The halogens do not form ions on the basis of the octet rule.

b. The alkali metals only conform to the octet rule when producing neutral atoms.

c. The transition metals do not necessarily conform to the octet rule.

d. The nonmetals do not conform to the octet rule.

When considering the octet rule, the explanation of the O^2- ion is

a. a loss of two electrons to get closer to 8 in the energy level.

b. when an oxygen atom gains two electrons, it has the same electron arrangement as neon, an inert gas.

c. oxygen’s nuclear charge of 8 can only hold 8 electrons in the outer shell.

d. oxygen is an exception to the octet rule.

What is the proper name of the compound FePO₄?

a. iron phosphide

b. iron(III) phosphide

c. iron(III) phosphate

d. iron phosphorus tetraoxide

The formation of ions typically occurs when

a. nonmetal atoms lose electrons and metals gain them.

b. metal and nonmetal atoms are close together in the number of valence electrons.

c. metal and nonmetal atoms have the same number of electrons.

d. nonmetal atoms gain electrons and metal atoms lose them.

Which of the following is a cation?

a. Ca²⁺

b. Na

c. Br

d. O^2-

Elements in family 8A tend to form anions.

True

False

According to the octet rule, strontium (Sr) will form which of the following monoatomic ions?

a. Sr^2-

b. Sr³⁺

c. Sr²⁺

d. Sr^3-

Predict the number of covalent bonds by N atom.

a. 1

b. 2

c. 3

d. 4

Which of the following is a binary compound?

a. NaOH

b. FeCl₃

c. Ca₃(PO₄)₂

d. None of these choices is a binary compound.

Calculate the mass of 10.00 moles of nickel(II) cyanide, Ni(CN)₂.

a. 847.0 grams

b. 987.0 grams

c. 1107 grams

d. 1694 grams

What is the formula of the ionic compound that forms between lithium ions and dichromate ions?

a. LiCr₂O₇

b. Li₃ Cr₂O₇

c. Li₂ Cr₂O₇

d. Li₄Cr₂O₇

In which bond does the oxygen atom possess a partial positive charge?

a. O-H

b. O-F

c. N-O

d. O-C

Dioxygen difluoride whose actual three dimensional shape is provided below is non-polar.

True

False

Ethanol, C₂H₅OH, is found in alcoholic beverages. If a 125-g sample is pure ethanol, how many moles of ethanol are present?

a. 0.419 moles

b. 2.72 moles

c. 5750 moles

d. 46.3 moles

What is the correct name of the compound Cl₂O₃?

a. dichlorine trioxide

b. Chlorine oxide

c. Chlorine trioxide

d. Chloride oxide

How many valence electrons must S atom gain to reach an octet?

a. 1

b. 2

c. 3

d. 4

Ag⁺ is an ion with 47 protons and 108 electrons.

True

False

What is the shape around C atom in OCN^-?

a. linear

b. bent

c. pyramidal

d. Trigonal planar

Which of the following bonds can be classified as polar?

a. NaCl

b. CH

c. CsBr

d. ClF

Potassium has lower electronegativity than F.

True

False

Which bond is most polar?

a. B-Cl

b. C-Cl

c. O-Cl

d. Cl-Br

The strongest noncovalent interaction that can occur between hydrocarbons is ___.

a. dipole-dipole forces

b. hydrogen bonding

c. ion-dipole interaction

d. London force

Which of the following is an ionic compound?

a. CS₂

b. CO₂

c. Mg(OH)₂

d. CH₄

Calcium chloride has the formula CaCl₂. As an ionic compound it is

a. composed of one cation and 2 anions.

b. held together by means of covalent bonds.

c. composed of two cations and one anion.

d. more likely a molecular compound.

The formula of a phosphate ion is ___.

a. PO₄ ^3-

b. P^3-

c. HPO₄ ^2-

d. H₂PO₄ ^-

How many electrons are contained in sulfide ion?

a. 18

b. 14

c. 30

. 16

Which symbol is representative of a halide ion?

a. He

b. Ne

c. I^-

d. Fe²⁺

All molecules with polar covalent bonds are polar.

True

False

General Organic and Biological Chemistry: CHEM115 Midterm review 2 Flashcards