On the periodic table, the atomic mass of oxygen is listed as 15.9994 amu. Based on this, one can deduce that the most common ______ of oxygen contains a total number of protons plus neutrons equalling ______.

• atom, 15.9994

• molecule, 8

• ion, 32

• isotope, 16

• element, 18

Which of the examples is potassium?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-1

What set of coefficients will balance this equation? ___HCl + ___CaCO₃ → ___CaCl₂ + ___H₂O + ___CO₂

• 2,2,2,1,3

• 2,1,1,1,1

• 3,1,1,2,2

• 2,3,3,1,3

• 1,1,1,1,1

Tags

NGSS.HS-PS1-7

Name this compound according to IUPAC nomenclature rules: NO

• nitrogen oxide

• nitrogen oxygen

• nitrogen monoxide

• mononitrogen monoxide

A carbon-12 atom has 6 protons, 6 neutrons, and 6 electrons. How many protons does a carbon-14 atom have?

• 6

• 8

• 1

• 2

Tags

NGSS.MS-PS1-1

AX + BY ---> AY + BX Classify the chemical reaction.

• synthesis reaction

• decomposition reaction

• single replacement reaction

• double replacement reaction

Both fructose and glucose have an empirical formula of CH₂O and a molecular mass of 180.15948 g/mol. Determine the molecular formula.

• C H₂O

• C₃H₆O₃

• C₆H₁₂O₆

• C₁₂H₂₄O₁₂

Sulfur oxides combine with water in the atmosphere to produce acid rain. What is the empirical formula of a sulfur compound that is 40% sulfur and 60% oxygen?

• S_²O₆

• SO

• SO₂

• S₃O₉

Determine how many grams of KI are required to produce 1.2g of PbI₂.

2KI + Pb(NO₃)₂ → 2KNO₃ + PbI₂

• 0.43 g

• 0.86 g

• 1.67 g

• 3.33 g

Tags

NGSS.HS-PS1-7

Based on the data, Carl has concluded that substance B must have __________ bonds.

• covalent

• diatomic

• ionic

• metallic

Tags

NGSS.HS-PS1-1