Unit 6 - Chemical Equations Flashcards Preview

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Flashcards in Unit 6 - Chemical Equations Deck (38):
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Symbols used in writing chemical equations

 

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Definition of a balanced chemical equation:

 

no atoms are lost or gained

 

the number of reacting atoms is equal to the number of product atoms

 

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Law of Conservation of Mass

 

Mass is neither created or destroyed during a chemical reaction - it is conserved.

 

 

Mass Reactants = Mass Products

 

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Subscript

 

 

Small numbers to the lower right of chemical symbols. Represent the number of atoms of each element in a molecule.

 

O₂

4

 

Coefficients

 

 

The large numbers in front of chemical formulas. Represents the number of molecules of the substance.

 

2Al

 

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Diatomic Molecules

 

 

If these elements appear by themselves in an equation, the must be in pairs with the subscript 2.

 

(H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂)

 

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Reactants

 

 

Substances being mixed in a chemical reaction. The left side of the equation.

 

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Products

 

 

Substance(s) being made. Right side of the equation.

 

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Synthesis or Combination

 

 

Two or more elements combine to make one product.

 

 

A + B --> AB

 

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Decomposition Reaction

 

 

One reactant breaks down into two or more elements.

 

 

AB --> A + B

 

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Single Replacement

 

 

An element and a compound are located on each side of the equation. The element on the reactant side switches with the similarly charged ion within the compound on the reactant side.

 

 

A + BC --> AC + B

 

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Double Displacement

 

 

There are two compounds on each side of the equation. During a DD Reaction the positively charged cations in each compound switch places. Also known as Precipitate Reaction.

 

 

AB + CD --> AD + CB

 

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Precipitate

 

 

Formation of a solid in a solution.

 

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Combustion

 

 

Any compound formed from only Carbon an Hydrogen (fuel) added to Oxygen to produce Carbon Dioxide and Water.

 

14

 

Predict the products and write a balanced equation from the following word statement:

 

Methane (CH₄) plus Oxygen Gas forms:

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How to PREDICT PRODUCTS of the 4 Main Types of Chemical Reactions.

 

 

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Predict the products of and write a balanced equation from the following word statement:

 

Methane (C3H8) reacts with Oxygen gas to form __________.

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17

Write a chemical equation from the following word equation:

Magnesium reacts with oxygen to form magnesium oxide.

2Mg + O₂ --> 2MgO

18

Write a chemical equation from the following word equation:

Magnesium reacts with aluminum chloride to form magnesium chloride and aluminum.

3Mg + 2AlCl₃--> 3MgCl₂ + 2Al

19

Write a chemical equation from the following word equation:

Sodium reacts with fluorine to form sodium fluoride

2Na + F₂--> 2NaF

20

Write a chemical equation from the following word equation:

Lithium chloride reacts with magnesium nitrate to form lithium nitrate and magnesium chloride.

2LiCl + Mg(NO₃)₂ --> 2Li(NO₃) + MgCl₂

21

Write a chemical equation from the following word equation:

Water decomposes into hydrogen gas and oxygen gas:

2H₂O → 2H₂ + O₂

22

Predict the products of and write a balanced equation from the following statement:

C₄H₆ + O₂ →

2C₄H₆ + 7O₂ →4CO₂ + 6H₂O

Combustion

23

Predict the products of and write a balanced equation from the following statement:

Mg + I₂ →

Mg + I₂ →MgI₂

Synthesis

24

Predict the products of and write a balanced equation from the following statement:

CuCl₂ + H₂S →

CuCl₂ + H₂S →CuS + 2HCl

Double Replacement

25

Predict the products of and write a balanced equation from the following statement:

HCl + Zn →

2HCl + Zn →ZnCl₂ + H₂

Single Replacement

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Predict the products of and write a balanced equation from the following statement:

H₂O₂ →

H₂O₂ → H₂ + O₂

DECOMPOSITION

27

Balance the following chemical equation:

__Al₂(SO₄)₃ + __Ca(OH)₂ → __Al(OH)₃ + __CaSO₄

Al₂(SO₄)₃ + 3Ca(OH)₂ → 2Al(OH)₃ + 3CaSO₄

28

Balance the following chemical equation:

__C₂H₆ + __O₂ → __CO₂ + __H₂O

2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

29

Balance the following chemical equation:

__C + __O₂ → __CO₂

1C + 1O₂ → 1CO₂

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C₄H₆ + O₂ →

2C₄H₆ + 7O₂ →4CO₂ + 6H₂O Combustion

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Mg + I₂ →

Mg + I₂ →MgI₂ Synthesis

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CuCl₂ + H₂S →

CuCl₂ + H₂S →CuS + 2HCl Double Replacement

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NaOH + HClO₄ →

NaOH + HClO₄ →NaClO₄+ H₂O Double Replacement

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HCl + Zn →

2HCl + Zn →ZnCl₂ + H₂ Single Replacement

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Na + MgCl₂ →

2Na + MgCl₂ →2NaCl + Mg Single Replacement

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CaCl₂ + K₂CO₃ →

CaCl₂ + K₂CO₃ →CaCO₃ + 2KCl Double Replacement

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K + Cl₂ →

2K + Cl₂ →2KCl Synthesis