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TEAS7 > Chemistry - Balancing Chemical Reactions > Flashcards

Chemistry - Balancing Chemical Reactions Flashcards

1
Q

What is the law of conservation of mass?

A

mass can neither be created nor destroyed

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2
Q

In equations, _____ represent moles.

A

coefficients

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3
Q

What is the number of moles in: 2H2O

A

2

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4
Q

A mol is equal to the ____ in ___ of an element

A

weight in grams

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5
Q

How many moles of oxygen are there, knowing that oxygen has an amu of 16.

A

1 mol is equal to the element weight (in grams); therefore 1 mol of Oxygen = 16g

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6
Q

What is the general formula for a combination/synthesis reaction?

A

A + B -> AB

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7
Q

What is the general formula for a decomposition reaction?

A

AB -> A + B

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8
Q

What is the general formula for a single deplacement reaction?

A

AB + C -> AC + B

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9
Q

What is the general formula for a double replacement reaction?

A

AB + CD -> AD + CB

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10
Q

What is the general formula for a combustion reaction?

A

CxHyOz + O2 -> CO2 + H2O

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11
Q

In combustion reactions, _____ (_____)reacts with ______ to create products of _______ + _______It will release _________ in the form of _______ and __________

A

fuel (CxHyOz/hydrocarbons)
O2
CO2 + H20
Energy
light and heat

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12
Q

PRACTICE: What type of reaction is being shown?

H₂ + Br₂ -> 2HBr

A

Combination/Synthesis RXN

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13
Q

PRACTICE: What type of reaction is being shown?

2Fe₂ + 3Cl₂ -> 2FeCl₃

A

Combination/Synthesis RXN

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14
Q

PRACTICE: What type of reaction is being shown?

H₂O -> 2H + O₂

A

Decomposition RXN

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15
Q

PRACTICE: What type of reaction is being shown?

Na₂S + 2HCl -> 2NaCl + H₂S

A

Double Replacement RXN

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16
Q

PRACTICE: What type of reaction is being shown?
H₂ + CuO -> Cu + H₂O

A

Single Displacement RXN

17
Q

If you begin with 2 moles of P₄ and 12 moles of Cl₂ in the reaction: P₄ + 6Cl₂ -> 4PCl₃, how many moles of PCl3 are produced?

A

8 mols

The reactants side is increasing by a factor of 2 (x2), so you must also multiple the coefficient by 2 on the products side: 4 x 2 = 8

18
Q

2C₂H₆ + 7O₂ -> 4CO₂ + 6H₂O

If C₂H₆ has a mass of 30g, what is the total mass of C₂H₆ needed in regards to the equation?

A

2 mols x 30g = 60g

TEAS7 (48 decks)

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