Exam I Review

The formula of ammonium carbonate is ________. A) (NH4)2CO3 B) NH4CO2 C) (NH3)2CO4 D) (NH3)2CO3 E) N2(CO3)3

A) (NH4)2CO3

________ typically form ions with a 2+ charge. A) Alkaline earth metals B) Halogens C) Chalcogens D) Alkali metals E) Transition metals

A) Alkaline earth metals

Which one of the following is not one of the postulates of Dalton's atomic theory? A) Atoms are composed of protons, neutrons, and electrons. B) All atoms of a given element are identical. The atoms of different elements are different and have different properties. C) Atoms of an element are not changed into different types of atoms by chemical reactions: atoms are neither created nor destroyed in chemical reactions. D) Compounds are formed when atoms of more than one element combine. A given compound always has the same relative number and kind of atoms. E) Each element is composed of extremely small particles called atoms.

A) Atoms are composed of protons, neutrons, and electrons.

Which one of the following compounds is chromium(III) oxide? A) Cr2O3 B) CrO3 C) Cr3O2 D) Cr3O E) Cr2O4

A) Cr2O3

Of the choices below, which one is not an ionic compound? A) PCl5 B) MoCl6 C) RbCl D) PbCl2 E) NaCl

A) PCl5

Elements in Group 6A are known as the ________. A) chalcogens B) alkali metals C) alkaline earth metals D) halogens E) noble gases

A) chalcogens

Precision refers to ________. A) how close a measured number is to other measured numbers B) how close a measured number is to the true value C) how close a measured number is to the calculated value D) how close a measured number is to zero E) how close a measured number is to infinity

A) how close a measured number is to other measured numbers

Which of the following has the same number of significant figures as the number 1.00310? A) 1 × 106 B) 199.791 C) 8.66 D) 5.119 E) 100

B) 199.791

What is the molecular formula for ethanol? A) CH3OH B) C2H5OH C) C3H7OH D) C4H9OH E) C5H11OH

B) C2H5OH

The correct formula of iron (III) bromide is ________. A) FeBr2 B) FeBr3 C) FeBr D) Fe3Br3 E) Fe3Br

B) FeBr3

Which one of the following is the formula of perchloric acid? A) HClO3 B) HClO4 C) HClO D) HCl E) HClO

B) HClO4

What is the formula of the compound formed between strontium ions and nitrogen ions? A) SrN B) Sr3N2 C) Sr2N3 D) SrN2 E) SrN3

B) Sr3N2

The correct name for HNO3 is ________. A) nitrous acid B) nitric acid C) hydronitroxide acid D) nitroxide acid E) nitrogen hydroxide

B) nitric acid

Which atom has the smallest number of neutrons? A) carbon-14 B) nitrogen-14 C) oxygen-16 D) fluorine-19 E) neon-20

B) nitrogen-14

All atoms of a given element have the same ________. A) mass B) number of protons C) number of neutrons D) number of electrons and neutrons E) density

B) number of protons

In the following list, only ________ is not an example of a chemical reaction. A) dissolution of a penny in nitric acid B) the condensation of water vapor C) a burning candle D) the formation of polyethylene from ethylene E) the rusting of iron

B) the condensation of water vapor

A combination of sand, salt, and water is an example of a ________. A) homogeneous mixture B) heterogeneous mixture C) compound D) pure substance E) solid

B. Heterogeneous Mixture

Predict the empirical formula of the ionic compound that forms from aluminum and oxygen. A) AlO B) Al3O2 C) Al2O3 D) AlO2 E) Al2O

C) Al2O3

Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties? A) H, Li B) Cs, Ba C) Ca, Sr D) Ga, Ge E) C, O

C) Ca, Sr

Of the following, the smallest and lightest subatomic particle is the ________. A) neutron B) proton C) electron D) nucleus E) alpha particle

C) Electron

When a metal and a nonmetal react, the ________ tends to lose electrons and the ________ tends to gain electrons. A) metal, metal B) nonmetal, nonmetal C) metal, nonmetal D) nonmetal, metal E) None of the above. These elements share electrons.

C) metal, nonmetal

Which pair of elements is most likely to form a molecular compound with each other? A) aluminum, oxygen B) magnesium, iodine C) sulfur, fluorine D) potassium, lithium E) barium, bromine

C) sulfur, fluorine

3) Which one of the following has the element name and symbol correctly matched? A) S, sodium B) Tn, tin C) Fe, iron D) N, neon E) B, bromine

C. Fe, iron

1 kilogram = ________ milligrams. A) 1 × 10-6 B) 1,000 C) 10,000 D) 1,000,000 E) none of the above

D) 1,000,000

Round the number 3456.5 to two significant figures. A) 3400.0 B) 3400 C) 3000 D) 3500 E) 3000.0

D) 3500

Which formula/name pair is incorrect? A) Mn(NO2)2 - manganese(II) nitrite B) Mg(NO3)2 - magnesium nitrate C) Mn(NO3)2 - manganese(II) nitrate D) Mg3N2 - magnesium nitride E) Mg(MnO4)2 - magnesium permanganate

D) Mg3N2 - magnesium nitride

________ is the chemical symbol for elemental sodium. A) S B) W C) So D) Na E) Sn

D) Na

Of the following, ________ contains the greatest number of electrons. A) P3+ B) P C) P2- D) P3- E) P2+

D) P3-

The correct name for NaHCO3 is ________. A) sodium hydride B) persodium carbonate C) persodium hydroxide D) sodium bicarbonate E) carbonic acid

D) sodium bicarbonate

The correct name for MgF2 is ________. A) monomagnesium difluoride B) magnesium difluoride C) manganese difluoride D) manganese bifluoride E) magnesium fluoride

E) magnesium fluoride