Unit 3 Flashcards

(12 cards)

1
Q

Chemical Reactions

A

Processes by which atoms of one or more substances rearrange to form new substance(s) (represented by chemical equations).

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2
Q

Evidence of Reactions

A
  1. Temperature Change
    • exothermic - energy released (hot)
    • endothermic - energy absorbed (cold)
  2. Change of State
    • formation of precipitate - solid formed when two aqueous solutions react
    • gas release (bubbling, effervescence)
    • disappearance of a solid
  3. Smell
  4. Colour Change
    • transparent, translucent, opaque
  5. Other Energy Changes: Light, Sound, Electrical
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3
Q

Parts of Chemical Equations

A
  • reactants (left side)
  • products (right side)
  • arrow symbol (yields or produces)
  • state symbols (s, l, g, or aq subscripts)
  • Stoichiometric coefficients
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4
Q

Types of Equations

A
  1. Word Equation: Uses names of substances
  2. Skeleton Equation: Uses formulas of substances (HOFBrINCl -g, g, g, l, s, g, g, are diatomic molecules with the subscript 2)
  3. Balanced Equation: Uses coefficients in front of formulas to make atoms equal on both sides
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5
Q

Law of Conservation of Mass

A

In any chemical reaction, the mass of the reactant(s) is equal to the mass of the product(s) (balanced).

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6
Q

Synthesis

A

More than one reactant, one product formed.

A + B -> C

A and B are compounds or elements, C is always a compound.

Metal oxide (s) + Water (l) -> Metal Hydroxide (Base)

Nonmetal oxide (g) + Water (l) -> Acid

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7
Q

Decomposition

A

One reactant, more than one product formed.

A -> B + C

A is always a compound, B and C are compounds or elements.

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8
Q

Single Displacement (Cation Single Displacement)

A

An element on the Activity Series replaces another below it (ionic compound + element on Activity Series).

AX + B -> BX + A

If B is not higher than A on the Activity series, there is no reaction.

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9
Q

Single Displacement (Anion Single Displacement)

A

A halogen replaces another below it (ionic compound + halogen)

AX + Y -> AY + X

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10
Q

Double Displacement (Neutralization)

A

Two ionic compounds switch ions
Acid + Base -> Salt + Water
AX + BY -> BX + AY

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11
Q

Double Displacement (Gas Releasing Double Displacement)

A

An acid or base reacts with a salt to form an acid or base that decomposes into water and the corresponding gas.

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12
Q

Double Displacement (Precipitation)

A

A solid is formed when two aqueous solutions react
AX (aq) + BY (aq) -> BX + AY
Use solubility chart to predict precipitate (one must be solid or no reaction)

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