Word Equations to Chemical Formulas in Chemical Reactions

When a CHEMICAL reaction occurs, what is made?

• No new substance is made.
• A new substance is made with new atoms formed
• A new substance is made, with existing atoms rearranged
• All substances remain the same, but physical state may change.

Tags

NGSS.HS-PS1-7

What does this word equation represent: Iron + oxygen → Iron (III) oxide

• A physical change in iron (nothing new gets made)

• A chemical reaction between iron and oxygen, where rust (iron oxide) is produced

• A chemical reaction between iron and rust, where oxygen is produced

• A physical change between iron and oxygen that forms a red color

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Magnesium can be burned in air to produce solid magnesium oxide.

• 2Mg(s) + O₂(g)→ 2MgO(s)
• Mg(s) + O(g) → MgO(s)
• 2Mg(s) + CO₂(g) → 2MgO(s) + C(s)
• 2Mg(s) + O₂(g) → Mg₂O₂(s)

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

NGSS.HS-PS1-7

Sodium reacts with chlorine to produce sodium chloride.

• NaCl(s) → Cl(g) + Na(s)
• Na(s) + CO₂(g) → NaCO₂(s)
• 2Na(s) + Cl₂(g) → 2NaCl(s)
• Na(s) + Cl(g) → NaCl

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Iron reacts with sulfur to produce iron (II) sulfide powder.

• 2Fe(s) + S(s) → Fe₂S(s)

• Fe(s) + S(s) → FeS(s)

• Fe(s) + S(g) → FeS(s)

• 4Fe(s) + S₂(g) → 2Fe₂S

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When lead reacts with oxygen, a yellow lead (II) oxide powder is produced.

• 2Pb(s) + O₂(g) → 2PbO(s)

• Pb(s) + O₂(g) → PbO₂(aq)

• 4Pb(s) + O₂(g) → 2Pb₂O(g)

• Pb(s) + O(g) → PbO(s)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

When hydrogen reacts with sulfur, a smelly gas is produced:

• H₂(g) + 2S(s) → 2HS
• H₂(g) + S(s) → H₂S(g)
• H(g) + S(s) → HS(g)
• 2H(g) + S(s) → H₂S(g)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the correct balanced equation for the following reaction:

A solution of phosphoric acid is mixed with lithium hydroxide forming lithium phosphate and water.

• HPO₄ + LiH → LiPO₄ + H₂

• H₂PO₃ + 2LiOH → 2H₂O + Li₂PO₄

• H₃PO₄ + 3LiOH → 3HOH + Li₃PO₄

• H₃P + 3 LiH → Li₃P + 6H

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Aqueous zinc chloride reacts with dihydrogen monosulfide gas to yield a zinc sulfide precipitate and hydrochloric acid.

• ZnCl₂ + H₂S→ 2HCl + ZnS

• ZnCl + H₂S → SCl + ZnH₂

• ZnCl₂ +2HS → 2HCl + ZnS₂

• HS₂ + ZnCl → HCl + SZn₂

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the correct balanced equation for the following reaction. Aqueous barium nitrate reacts with sulfuric acid to yield a barium sulfate precipitate and nitric acid 

• Ba(NO₃)₂ + H₂SO₄ → BaSO₄ + 2HNO₃
• BaNO₃ + H₂S → H₂NO₃ + BaS
• BaNO₃ + H₂S → HNO₃ + BaSO₄
• Ba₂NO₃ + H₂SO₄ → H₂NO₃ + BaS

Tags

NGSS.HS-PS1-7