Word and Skeleton Equations

Which of the following is a correct word equation for the reaction between hydrogen and oxygen to form water?

• Hydrogen + Oxygen -> Water

• Hydrogen + Water -> Oxygen

• Oxygen + Water -> Hydrogen

• Water -> Hydrogen + Oxygen

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the skeleton equation for the combustion of methane?

• @@ ext{CH}_4 + ext{O}_2 ightarrow ext{CO}_2 + ext{H}_2 ext{O}@@

• @@ ext{CH}_4 + ext{O}_2 ightarrow ext{CO} + ext{H}_2 ext{O}@@

• @@ ext{CH}_4 + ext{O}_2 ightarrow ext{C} + ext{H}_2 ext{O}@@

• @@ ext{CH}_4 + ext{O}_2 ightarrow ext{C} + ext{H}_2@@

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a word equation, what does the arrow (->) represent?

• The direction of the reaction

• The equality of reactants and products

• The separation of reactants

• The separation of products

Which of the following is a balanced skeleton equation for the reaction of sodium with chlorine gas?

• @@ ext{Na} + ext{Cl}_2 ightarrow ext{NaCl}@@

• @@2 ext{Na} + ext{Cl}_2 ightarrow 2 ext{NaCl}@@

• @@ ext{Na} + 2 ext{Cl}_2 ightarrow ext{NaCl}_2@@

• @@2 ext{Na} + 2 ext{Cl}_2 ightarrow 2 ext{NaCl}_2@@

Tags

NGSS.MS-PS1-5

What is the word equation for the reaction of iron with oxygen to form iron(III) oxide?

• Iron + Oxygen -> Iron(III) Oxide

• Iron + Iron(III) Oxide -> Oxygen

• Oxygen + Iron(III) Oxide -> Iron

• Iron(III) Oxide -> Iron + Oxygen

Tags

NGSS.MS-PS1-5

Which of the following represents a skeleton equation for the decomposition of water?

• @@ ext{H}_2 ext{O} ightarrow ext{H}_2 + ext{O}_2@@

• @@ ext{H}_2 ext{O} ightarrow ext{H}_2 + ext{O}@@

• @@ ext{H}_2 ext{O} ightarrow ext{H} + ext{O}_2@@

• @@ ext{H}_2 ext{O} ightarrow ext{H} + ext{O}@@

Tags

NGSS.MS-PS1-5

In a chemical equation, what does the term 'skeleton equation' refer to?

• An unbalanced equation showing the reactants and products

• A balanced equation with coefficients

• An equation with only products

• An equation with only reactants

Which of the following is a correct word equation for the reaction of magnesium with hydrochloric acid?

• Magnesium + Hydrochloric Acid -> Magnesium Chloride + Hydrogen

• Magnesium + Hydrochloric Acid -> Magnesium + Chlorine

• Magnesium + Hydrochloric Acid -> Magnesium Hydroxide + Chlorine

• Magnesium + Hydrochloric Acid -> Magnesium Oxide + Water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the skeleton equation for the reaction of calcium carbonate with hydrochloric acid?

• @@ ext{CaCO}_3 + ext{HCl} ightarrow ext{CaCl}_2 + ext{CO}_2 + ext{H}_2 ext{O}@@

• @@ ext{CaCO}_3 + ext{HCl} ightarrow ext{CaCl}_2 + ext{H}_2 ext{O}@@

• @@ ext{CaCO}_3 + ext{HCl} ightarrow ext{CaCl}_2 + ext{CO}_2@@

• @@ ext{CaCO}_3 + ext{HCl} ightarrow ext{CaCl}_2 + ext{H}_2@@

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a balanced skeleton equation for the reaction of aluminum with oxygen?

• @@4 ext{Al} + 3 ext{O}_2 ightarrow 2 ext{Al}_2 ext{O}_3@@

• @@2 ext{Al} + 3 ext{O}_2 ightarrow ext{Al}_2 ext{O}_3@@

• @@ ext{Al} + ext{O}_2 ightarrow ext{Al}_2 ext{O}_3@@

• @@4 ext{Al} + ext{O}_2 ightarrow 2 ext{Al}_2 ext{O}_3@@

Tags

NGSS.MS-PS1-5