Stoichiometry Fundamentals
Flashcard
•
Science
•
6th - 8th Grade
•
Hard
Barbara White
FREE Resource
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18 questions
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1.
FLASHCARD QUESTION
Front
Stoichiometry Noun
[stoy-kee-om-i-tree]
Back
Stoichiometry
The calculation of quantities, such as mass or moles, of reactants and products involved in a chemical reaction.
Example: This image shows a chemical reaction where atoms in the reactants (left) rearrange to form the products (right), demonstrating that atoms are conserved.
2.
FLASHCARD QUESTION
Front
Reactant Noun
[ree-ak-tuhnt]
Back
Reactant
A substance that takes part in and undergoes change during a chemical reaction, found on the left side of an equation.
Example: This diagram shows that reactants, like methane and oxygen, are the starting substances on the left side of a chemical reaction that are transformed into products.
3.
FLASHCARD QUESTION
Front
Product Noun
[prod-uhkt]
Back
Product
A substance that is formed as the result of a chemical reaction, found on the right side of an equation.
Example: In a chemical reaction, reactants like hydrogen (H₂) and oxygen (O₂) combine to form a new substance, which is called the product (water, H₂O).
4.
FLASHCARD QUESTION
Front
Mole Noun
[mohl]
Back
Mole
The SI unit for the amount of a substance, defined as containing exactly 6.022 x 10²³ elementary entities.
Example: This diagram shows that one mole is a specific quantity of a substance, defined as the number of atoms in exactly 12 grams of carbon-12.
5.
FLASHCARD QUESTION
Front
Law of Conservation of Mass Noun
[law uv kon-ser-vey-shuhn uv mas]
Back
Law of Conservation of Mass
The principle that mass is neither created nor destroyed in a chemical reaction; total reactant mass equals total product mass.
Example: In a closed container, the total mass of the chemicals before a reaction (184.34 g) is exactly equal to the total mass after the reaction, proving mass is conserved.
6.
FLASHCARD QUESTION
Front
Coefficient Noun
[koh-uh-fish-uhnt]
Back
Coefficient
A number placed before a chemical formula in a balanced equation indicating the relative number of moles of that substance.
Example: The number '2' in front of O₂ and H₂O is a coefficient, showing that two molecules of oxygen react to produce two molecules of water.
7.
FLASHCARD QUESTION
Front
Avogadro's Number Noun
[av-uh-gah-drohz nuhm-ber]
Back
Avogadro's Number
The number of particles, such as atoms or molecules, in one mole of a substance, approximately 6.022 x 10²³.
Example: The image defines Avogadro's number as the quantity in one mole (6.02 x 10^23) and shows how to use this value to convert moles of a substance into the number of atoms.
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