Stoichiometry Test

2H₂  +   O₂  →  2H₂O
How many moles of oxygen are consumed if 8 moles H₂ are used?

• 2

• 4

• 6

• 8

Tags

NGSS.MS-PS1-5

NaClO₃ (s) --> 2NaCl (s) +3 O₂ (g)
12.00 moles of NaClO₃ will produce how many grams of O₂?

• 256 g of O₂

• 576 g of O₂

• 288 g O₂

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from  6 moles H₂? 

• 4 moles Fe

• 6 moles Fe

• 9 moles Fe

• 2 moles Fe

Tags

NGSS.HS-PS1-7

2H₂   +   O₂  →  2H₂O
How many moles of water can be produced if 8 moles H₂ are used?

• 4 moles

• 8 moles

• 16 moles

• 2 moles

Tags

NGSS.HS-PS1-7

In the chemical equation below, Na is the symbol for sodium

• 4

• How many sodium atoms are on the left side

• 2

• How many sodium atoms are on the left side?

• 4

• How many hydrogen atoms are on the left side?

• 2

• How many hydrogen atoms are on the right side?

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The blue numbers in the image below represent ________

• I don't know, and don't want to try

• coefficients

• subscripts

• none of the answers are correct

Tags

NGSS.HS-PS1-7

A number written in front of a chemical formula is called a(n)

• subscript

• superscript

• yield

• coefficient

What is a coefficient?

• The small number on the right of the chemical symbol.

• The large number to the left of a formula.

Balance the following reaction :
 
CaC₂(s)   +   H₂O(l)   -->   C₂H₂(g)   +   Ca(OH)₂(aq)

• 1,2,2,2

• 1,2,1,1

• 2,1,1,1

• 2,1,2,1

What is the first thing you must do to solve a stoichiometry problem?

• Write a Balanced Equation

• Panic

• Write an Unbalanced Equation

• Ask for help