Chemical Quantities

What is the SI unit for the amount of a substance?

• meter

• mass

• molecule

• mole

How many hydrogen atoms are in the compound: (NH₄)₂CO₃

• 3
• 4
• 6
• 8

What is the percent composition of nitrogen in NH₃?

• 25%
• 14%
• 28%
• 82%

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇
• C₂H₄O₂ and C₆H₁₂O₆
• C₃H₆O₃ and C₂H₆O₂
• CH₄ and C₂H₆

A formula with the lowest whole # ratio of elements in a compound is called

• Molecular Formula
• Chemical Formula
• Empirical Formula 
• Distance Formula

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

• CH₂O
• C₂H₄O₂
• C₄H₈O₄
• C₆H₁₂O₆

Tags

NGSS.HS-LS1-6

C₆H₁₂O₆ has how many total atoms?

• 6

• 12

• 24

Tags

NGSS.MS-PS1-1

What is STP?

• States of Temperature and Pressure, 1 $1\degree C$  0 atm

• Standard Tire Pressure, 65 psi

• Standard Temperature and Pressure,  $0\degree C$  1 atm

• Standard Timing and Pressure, 273 K 0 atm

Diatomic molecules are __________ found in nature as their single element: I, O, N, H, Br, Cl, or H.

• often
• never
• sometimes
• always

What is Avogadro's Number? 

• 6.02 x 10²³
• - 6.02 10²³
• 6.02 x 10²²
• 6,020,000,000,000