Introduction To Chemistry

What is the percent abundance of the third isotope? A) 9.22% B) 0.0922% C) 90.78% D) none of the choices

A) 9.22%

What is the formula for an ionic compound made from barium and nitrogen? A) Ba3N2 B) Ba2N3 C) BaN D) Ba2N4

A) Ba3N2

Which of the following is NOT an alkali metal? A) H B) Li C) Na D) K

A) H

Choose the pair of name and formula that do not match. A) magnesium nitrite: Mg(NO3)2 B) calcium carbonate: CaCO3 C) aluminum sulfate: Al2(SO4)3 D) sodium hydrogen carbonate: NaHCO3

A) magnesium nitrite: Mg(NO3)2

What is the formula of the compound formed by ammonium and sulfate? A) (NH3)2SO4 B) (NH4)2SO4 C) NH4(SO4)2 D) none of the choices

B) (NH4)2SO4

What is the isotopic mass of the third isotope (should have the correct number of significant figures)? A) 22.02 amu B) 22.0 amu C) 21.99 amu D) 21.9 amu

B) 22.0 amu

According to Dalton's atomic theory, A) All atoms are different. B) Indestructible atoms make up matter. C) All atoms contain protons, electrons and neutrons. D) The nucleus is positively charged.

B) Indestructible atoms make up matter.

An element has a mass number of 119. It has 69 neutrons and 46 electrons. Which of the following is TRUE about this element? A) The element is Pd. B) Its nuclear charge is +50. C) The charge of the atom of this element is 4. D) Its atomic number is 46.

B) Its nuclear charge is +50.

Which of the following gives an INCORRECT name for the compound? A) BCl3 - boron trichloride B) Li2S - lithium(I) sulfide C) HF(aq) - hydrofluoric acid D) CCl4 - carbon tetrachloride

B) Li2S - lithium(I) sulfide

What is the correct formula for phosphide? A) P B) P3 C) Pd2 D) P2

B) P3

What is the proper name for HBr(aq) ? A) hydrobromous acid B) hydrobromic acid C) hydrousbromic acid D) bromous acid

B) hydrobromic acid

How many protons and electrons are present in O2-? A) 8 protons and 8 electrons. B) 6 protons and 8 electrons. C) 8 protons and 10 electrons. D) 16 protons and 8 electrons.

C) 8 protons and 10 electrons.

A certain oxyacid is derived from 2 3SO . The formula for the oxyacid is A) H2SO4(aq) B) HSO3(aq) C) H2SO3(aq) D) H3SO3(aq)

C) H2SO3(aq)

Identify the ions composing Mn(SO3)2. A) Mn2+ and SO32 B) Mn3+ and SO32 C) Mn 4+ and SO32 D) Mn 2+ and SO3

C) Mn 4+ and SO32

Which of the following is a metalloid? A) Al B) Sn C) Sb D) Se

C) Sb

Which of the following gives an INCORRECT group for the given element? A) F - halogen B) Rn - noble gas C) Sr - alkali metal D) none of the choices

C) Sr - alkali metal

What is the name of the compound with the formula Ni3(PO4)2? A) nickel phosphate B) nickel(III) phosphate C) nickel(II) phosphate D) trinickel diphosphate

C) nickel(II) phosphate

Oxygen containing ionic compound has the formula M2O where M is an unknown ion. Ion M has 78 electrons. What is the identity of the M ion? A) Pt+ B) Ir+ C) Au2+ D) Au+

D) Au+

What is the name of the molecular compound SF5? A) sulfur hexafluoride B) monosulfur pentafluoride C) sulfur heptafluoride D) sulfur pentafluoride

D) sulfur pentafluoride

Gold and silver are inner transition elements.

False

If He-4 is the standard with an assigned mass of exactly 2 amu, C-12 will have an assigned mass 24 amu.

False

Protons and electrons each have a mass of 1 amu.

False

The acid derived from nitrite is nitric acid and its formula is HNO3(aq)

False

The alkali metal in the 4th period is calcium.

False

The correct formula for calcium fluoride is CaF3.

False

The correct name for the compound whose chemical formula is Cu2CrO4 is copper chromate.

False

The correct name for the compound with the formula XeO2 is monoxenon dioxide.

False

The formula for the compound formed by calcium and chlorate is CaClO3.

False

The name of the compound CH4 is ammonia.

False

The name of the ion N3 is nitrogen.

False

According to Mendeleev's periodic law, when elements are arranged in increasing atomic mass, certain properties recur periodically.

True

Based on the current standard for atomic mass, the mass of 1 amu is 1/12 the mass of the C-12 atom.

True

Ionic compounds have a net charge of zero.

True

The formula for the oxyacid formed by carbonate is H2CO3(aq).

True

The name of the acid formed from CN is hydrocyanic acid.

True

The name of the ion with the symbol Hg22+ is mercury(I).

True

The nucleus of an atom is tiny and massive.

True

The subscripts in a chemical formula do not change for a given compound.

True

The symbol for the hypoiodite ion is IO .

True