Why is it important to write chemical equations using both symbols and words?

• To make the equations look more complex

• To help in verbal communication of chemical reactions

• To confuse the reader

• To make the equations longer

What does the phase symbol (s) represent in a chemical equation?

• Aqueous

• Liquid

• Gas

• Solid

Tags

NGSS.MS-PS1-4

In the reaction Na(s) + H2O(l) -> NaOH(aq) + H2(g), what does NaOH(aq) represent?

• Sodium hydroxide in solid phase

• Sodium hydroxide in liquid phase

• Sodium hydroxide in aqueous phase

• Sodium hydroxide in gas phase

Tags

NGSS.MS-PS1-2

How would you describe H2(g) in words?

• Hydrogen gas

• Hydrogen aqueous

• Hydrogen liquid

• Hydrogen solid

What is the chemical symbol for fluorine gas?

• Fl2

• F2

• F

• Fl

What does the Roman numeral III indicate in iron(III) fluoride?

• The phase of the compound

• The oxidation state of iron

• The number of fluoride ions

• The number of iron atoms

How many fluoride ions are needed to balance one iron(III) ion?

• One

• Four

• Two

• Three

What is the balanced form of the equation Fe(s) + F2(g) -> FeF3(s)?

• Fe + 2F2 -> FeF3

• Fe + F2 -> FeF3

• 3Fe + 2F2 -> 3FeF3

• 2Fe + 3F2 -> 2FeF3

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the purpose of balancing a chemical equation?

• To change the reactants

• To ensure the same number of atoms of each element on both sides

• To change the products

• To make the equation look neat

Tags

NGSS.MS-PS1-5

What should you do if the number of atoms of an element is not the same on both sides of a chemical equation?

• Add more reactants

• Change the subscripts

• Ignore it

• Balance the equation by adjusting coefficients

Tags

NGSS.MS-PS1-5