Final Exam Review

Which best describes the current atomic theory?

• Atoms consist of electrons circling in definite orbits around a positive nucleus.

• Atoms are composed of electrons in a cloud around a positive nucleus.

• Atoms can easily be split, at which time they become radioactive.

• An atom’s mass is determined by the mass of its neutrons.

What is the nuclear composition of uranium-235?

• 92 electrons and 143 protons

• 92 protons and 143 electrons

• 143 protons and 92 neutrons

• 92 protons and 143 neutrons

Which best describes the relationship between subatomic particles in any neutral atom?

• The number of protons equals the number of electrons.

• The number of protons equals the number of neutrons.

• The number of neutrons equals the number of electrons.

• The number of neutrons is greater than the number of protons.

What is the name of the compound Rb₂O?

• Rubidium oxide

• Rubidium (II) oxide

• Rubidium oxide (II)

• Rubidium (IV) oxide

What is the chemical formula for calcium nitrate? (Nitrate = NO₃⁻¹)

• CaNO₃

• Ca(NO₂)₂

• Ca(NO₃)₂

• Ca₃N₂

What is the correct formula for dinitrogen pentoxide?

• N₂O

• NO₂

• N₂O₅

• NO₄

If the volume of an 18.5 g piece of metal is 2.35 cm³, what is the identity of the metal? (D=m/v)

• Iron 7.87 g/cm³

• Lead 11.35 g/cm³

• Nickel 8.90 g/cm³

• Zinc 7.14 g/cm³

Which pair of elements would most likely bond to form a covalently bonded compound?

• Sodium and fluorine

• Barium and chlorine

• Phosphorus and oxygen

• Magnesium and sulfur

The compound formed between element Q and oxygen has the chemical formula Q₂O. Which element would Q most likely represent?

• Ca

• Zn

• Li

• Sn

Which correctly lists four atoms from smallest to largest radius?

• I, Br, Cl, F

• F, I, Br, Cl

• Si, P, S, Cl

• Cl, S, P, Si