PRACTICE-CHEMISTRY POST TEST

A student measured the mass of a chemical sample to be 6.00 g. The number of significant figures in this mass is—

• 3

• 4

• 6

• 7

Answer explanation

Where are protons, neutrons, and electrons located in an atom?

• Protons and neutrons in the nucleus; electrons in the orbitals

• Protons and electrons in the nucleus; neutrons in the orbitals

• Neutrons and electrons in the nucleus; protons in the orbitals

• All three in the orbitals

Answer explanation

Refer to the Periodic Table diagram. What group is indicated by 8A?

• Halogens

• Alkaline Earth Metals

• Alkali Metals

• Noble Gases

Answer explanation

Refer to the Periodic Table diagram. What group is indicated by 1A?

• Halogens

• Alkaline Earth Metals

• Alkali Metals

• Noble Gases

Answer explanation

Refer to the Periodic Table diagram. What group is indicated by 8A?

• Halogens

• Alkaline Earth Metals

• Alkali Metals

• Noble Gases

Answer explanation

Refer to the Periodic Table diagram. What group is indicated by 2A?

• Halogens

• Alkaline Earth Metals

• Alkali Metals

• Noble Gases

Answer explanation

Which of the following group 1 elements has the largest atomic radius?

• Potassium

• Lithium

• Sodium

• Rubidium

Answer explanation

Atomic radius gets larger as you move down a group in the Periodic Table because of an increasing number of energy levels.

• pentabromine fluoride

• bromine fluoride

• bromine pentafluoride

• bromine pentafluorine

Answer explanation

Binary molecular compounds ( compounds composed of two nonmetals) are named with prefixes indicating the number of atoms of each element.

The first element keeps its name and the second element changes its ending to -ide.

bromine pentafluoride

Tags

NGSS.MS-PS1-1

___C6H5COOH + ___O2 → ___CO2 + ___H2O What are the correct coefficients to balance this equation?

• 3C6H5COOH + 18O2 → 14CO2 + 8H2O

• C6H5COOH + 12O2 → 7CO2 + 3H2O

• 2C6H5COOH + 15O2 → 14CO2 + 6H2O

• 2C6H5COOH + 16O2 → 16CO2 + 8H2O

Tags

NGSS.MS-PS1-5

FeS(s) + 2HCl(aq) → H2S(g) + FeCl2(aq)

• FeS(s) + 2HCl(aq) → H2S(g) + FeCl2(aq)

• FeS(s) + 2HCl(aq) → H2(g) + FeCl2(aq)

• FeS(s) + 2HCl(aq) → H2S(g) + FeCl3(aq)

• FeS(s) + 2HCl(aq) → H2(g) + FeCl3(aq)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5