Stoichiometry Unit Review

What is the measurement using the correct number of sig. figs.?

• 39.5 mL
• 40 mL
• 39 mL
• 40.0 mL

This bullseye demonstrates...

• High Accuracy & High Precision
• High Accuracy & Low Precision
• Low Accuracy & High Precision
• Low Accuracy & Low Precision

Which of the following numbers have two significant figures?

• 21

• 4900.

• 0.000210

• 0.023

Which has more molecules?

• 1 mole H₂O
• 1 mole NH₃

• 1 mole CCl₄

• There are all the same

The molar mass of an element is equal to its...

• Atomic mass expressed in grams

• Atomic number
• Oxidation number
• Valence electrons

Tags

NGSS.HS-PS1-7

A mass of 6 g of Carbon contains

• 1 mole of C
• 2 moles of C
• 0.5 moles of C
• 72 moles of C

Tags

NGSS.HS-PS1-7

Which of the following quantities are conserved in every chemical reaction? (select all that apply)

• mass

• number of atoms

• number of molecules

• moles

Tags

NGSS.HS-PS1-7

When balancing a chemical equation, you can only change _________, you can never change _______!

• coefficients, subscripts

• subscripts, coefficients

• formulas, subscripts

• coefficients, formula units

Mole Ratios used for conversions are derived from:

• the molar mass of the reactants in the balanced chemical equation

• the coefficients of the balanced chemical equation

• the subscripts of the products in the balanced chemical equation

• the group number of each element in the balanced chemical equation

Tags

NGSS.HS-PS1-7

If there are 2 moles of oxygen available, which mole ratio will tells how much water is produced?

C₃H₈ +5O₂ → 3CO₂ + 4H₂O

• 4 mol H₂O/ 5 mol O₂

• 5 mol O₂/ 4 mol H₂O

• 2 mol O₂/ 4 mol H₂O

• 4 mol O₂/ 2 mol H₂O

Tags

NGSS.HS-PS1-7