Chem. Ch. 10

Color change is an indication of a chemical change. Color change is __________ property.

• a physical

• a chemical

• both a chemical and a physical

• neither a chemical nor a physical

Which of the following balances the equation Li(s) + H2O ⎯ Δ→ LiOH(s) + H2(g)?

• 2Li(s) + H2O(l) ⎯ Δ→ 2LiOH(s) + H2(g)

• 2Li(s) + 2H2O(l) ⎯ Δ→ 2LiOH(s) + H2(g)

• Li(s) + 2H2O(l) ⎯ Δ→ 2LiOH(s) + H2(g)

• 2Li(s) + H2O(l) ⎯ Δ→ LiOH(s) + H2(g)

Tags

NGSS.HS-PS1-7

Which of the following shows the correct balanced equation describing copper(I) oxide forming when solid copper reacts with oxygen gas?

• 2Cu(s) + O2(g) ⎯→2Cu2O(s)

• 4Cu(s) + O2(g) ⎯→ 2Cu2O(s)

• 4Cu(s) + O2(g) ⎯→ 4CuO(s)

• 2Cu(s) + O2(g) ⎯→ CuO2(s)

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following correctly balances the equation Li + N2 ⎯→ Li3N?

• 6Li + N2 ⎯→ 2Li3N

• 6Li + N2 ⎯→ 3Li3N

• 3Li + N2 ⎯→ Li3N

• 6Li + 2N2 ⎯→ 2Li3N

Tags

NGSS.HS-PS1-7

Which of the following correctly balances the equation Cr (OH)3 + HClO4 ⎯→ Cr(ClO4)3 + H2O?

• Cr (OH)3 + HClO4 ⎯→ Cr (ClO4)3 + 2H2O

• 2Cr (OH)3 + 2HClO4 ⎯→ Cr (ClO4)3 + 3H2O

• Cr (OH)3 + 3HClO4 ⎯→ Cr (ClO4)3 + 3H2O

• 3Cr (OH)3 + 3HClO4 ⎯→ 3Cr (ClO4)3 + 3H2O

When balancing a chemical equation, it is usually best to begin with the __________.

• simplest molecule

• most complicated molecule

• products

• reactants

Double arrows between reactants and products indicate that a reaction is a __________ reaction.

• synthesis

• decomposition

• reversible

• single-replacement

The reaction 4Fe + 3O2 ⎯→ 2Fe2O3 is a __________ reaction.

• synthesis

• single-replacement

• decomposition

• double-replacement

What type of reaction is the equation 2H2 SO4 (l)⎯ Δ→2H2O(g) + 2SO2(g) + O2(g)?

• synthesis

• single-replacement

• double-replacement

• decomposition

The combustion of hydrocarbons produces __________.

• CO2

• H2O

• C2OH

• CO2 +H2O

Tags

NGSS.MS-PS1-5