Section 1.5 Chemical Equations Flashcards

1
Q

What are the components of a chemical reaction?

A

Reactants (the substances you start with) and the products (the new substances made)

Can be a word or symbol equation

Has an arrow to represent the reactants forming the products (never use equals sign)

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2
Q

What is a chemical reaction?

A

In a chemical reaction, the atoms get rearranged but are never destroyed or created

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3
Q

What does an equation being balanced mean?

A

When there is the same number of each types of atom on both sides of the equation. This is because the total mass of the products formed in a reaction is equal to the total mass of the reactants (because atoms are not destroyed or created)

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4
Q

What are state symbols?

A

State symbols show the state of the compound/element:

(s) for solid
(l) for liquid
(g) for gases
(aq) for substances dissolved in water or aqueous solutions

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5
Q

Balance this equation:

H2 + O2 → H2O

A

2H2 + O2 → 2H2O

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6
Q

Balance this equation:

KNO3 → KNO2 +O2

A

2KNO3 → 2KNO2 + O2

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7
Q

Balance this equation:

Li + O2 → Li2O

A

4Li + O2 → 2Li2O

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8
Q

Balance this equation:

Fe + O2 → Fe2O3

A

4Fe + 3O2 → 2Fe2O3

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