Describing 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 oxide

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

• A chemical reactinon 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

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

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-PS1-2

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.HS-PS1-2

NGSS.HS-PS1-7

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-PS1-2

NGSS.HS-PS1-4

NGSS.HS-PS1-7

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

Magnesium + hydrochloric acid --> _____________ + hydrogen

What is missing?

• Magnesium oxide

• Magnesium hydride

• Magnesium chloride

• Magnesium hydroxide

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Iron + ________________ --> iron sulphate + copper

What is missing?

• Copper oxide

• Copper sulphate

• Iron sulphate

• Iron oxide

Magnesium + ________ --> magnesium oxide

What is missing?

• Hydrogen

• Sulphur

• Oxygen

• Oxide

Tags

NGSS.HS-PS1-1