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14 Cards in this Set
- Front
- Back
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The products of NaCl + AgNO₃ are ___ + ___ |
AgCl + NaNO₃ |
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Of these two products, AgCl + NaNO₃, which one is the "precipitate" and which is soluble in water? |
AgCl is the (s) precipitate NaNO₃ is (aq) |
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Sodium hydroxide + Copper II sulfate → ? + ? |
Sodium sulfate + Copper II hydroxide |
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Evidence that a double replacement reaction has occurred is the production of.... |
a gel, solid, or gas |
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Does this reaction occur?: NaCl (aq) + KI (aq) → NaI (aq) + KCl (aq) |
No. Both products are (aq). There's no evidence of a solid or gas. |
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In this reaction, NaOH + CuSO₄ → Na₂SO₄ + Cu(OH)₂ which product is the precipitate/solid? |
Cu(OH)₂ [Hydroxides are insoluble except IA.] |
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Finish this reaction & ID the (aq) & (s): Pb(NO₃)₂ (aq) + KCl (aq) → ? + ? |
KNO₃ (aq) + PbCl₂ (s) |
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In this equation, why does NO₃ on the left have a subscript 2, but not after NO₃ on the right? Pb(NO₃)₂ (aq) + KCl (aq) → KNO₃ (aq) + PbCl₂ (s) |
Pb is +2 & NO₃ is -1. So, they cross-down to make the formula balance. On the right, Na is +1 and NO₃ is -1. So, it doesn't need any subscript to make the formula balance? |
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In this equation, why does Cl on the left have no subscript, but has subscript 2 on the right? Pb(NO₃)₂ (aq) + KCl (aq) → KNO₃ (aq) + PbCl₂ (s) |
Because K⁺¹ Cl⁻¹ are balanced; Pb⁺²Cl⁻¹ need to cross-down to balance that formula |
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Do balancing subscripts from the left side of an equation automatically get moved to the right side of an equation? |
No. Subscripts are only to be used if one is needed to balance a formula. |
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Do you need to move subscripts from polyatomic ions like SO₄⁻² or CO₃⁻² from left side to right side? |
Absolutely. Those subscripts can never be changed. |
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The pattern for double replacement reactions is |
AD + CB |
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In this pattern, does it matter if AD or CB is written first? AB + CD → AD + CB |
No |
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In this pattern, does it matter if you write BC instead of CB? AB + CD → AD + CB |
Yes. You must write it as CB, because the positive must be written first in the formula. B is the negative ion, which is written second. |
