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Chemistry > Chem test - counting atoms, balancing equations, etc > Flashcards

Chem test - counting atoms, balancing equations, etc Flashcards

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1
Q

Acid reactions with metals

A

Acid + metal = metal salt + hydrogen

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2
Q

Acid reaction with metal carbonate

A

Acid + metal carbonate = metal salt + carbon dioxide + water

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3
Q

Acid reaction with metal oxide (neutrilization)

A

Acid + base = salt + water

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4
Q

A salt is…

A

A chemical compound formed in a specific structure made by combining an acid and base

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5
Q

Hydrochloric (HCL) acid becomes…

A

(metal name) chloride

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6
Q

Sulphuric acid (H2SO4) becomes…

A

(metal name) sulphate

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7
Q

Nitric acid (HNO3) becomes…

A

(metal name) Nitrate

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8
Q

Carbon acid (H2CO3) becomes…

A

(metal name) carbonate

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9
Q

What is a chemical reaction?

A

A chemical reaction describes a chemical change

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10
Q

What is a reactant?

A

Left side of equation
Where the arrow begins
Contains the chemical(s) you start with

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11
Q

What is a product?

A

Right side of equation
Where arrow leads to
Contains new chemical(s) formed

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12
Q

What is the coefficient?

A

Shows how many molecules there are in a specific chemical

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13
Q

What is a subscript?

A

Shows how many atoms of a specific element there are in a molecule

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14
Q

Chemical reactions and the law of conservation of mass

A

In a chemical reaction, the law of conservation of mass must be upheld. The same number and same types of atoms going into the equation, must be the same going out (just rearranged)

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15
Q

Can Subscripts be changed?

A

NO

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16
Q

Can you change the coefficient?

A

YES

17
Q

Where do coefficients go?

A

They go at the front of the chemical formula, not in the middle

18
Q

Practice! K2CO3 –>

A 
K = 2
C = 1
O = 3
TOTAL = 6
19
Q

Practice! 2(NH4)2Cr2O7

A 
N = 4
H = 16
Cr = 4
O = 14 
TOTAL = 38
20
Q

What do we do with a coefficient?

A

When there is a coefficient, multiply it by all of the subscripts.

21
Q

What do we do with parenthesis?

A

When there are parenthesis, you must multiply whatever subscript that’s in the parenthesis by the outer subscript

22
Q

How do we balance equations?

A

In order to balance an equation, we add in coefficients to make there be the same amount of atoms per element. Basically, making sure there are the same amount of subscripts going in as going out.

23
Q

What is the 2 and 3 and 3 and 2 rule?

A

That rule is basically, when there are two subscipts on either side of the arrow and one is odd while the other is even. The Law says that you add the coefficient of the opposite subscript. Ex. CO2 –> CO3 soooo
3CO2 –> 2CO3. now they both have 6.

Chemistry (5 decks)

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