C3.1 Introducing chemical reactions Flashcards

1
Q

Avogadro constant

A

the number of entities in one mole, equal to the number of atoms in 12.0 g of 12C atoms, 6.02 × 1023

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2
Q

balanced equation

A

a model for a reaction showing formulae and number of units for all substances involved. The numbers of each atom are the same on both sides of the equation

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3
Q

closed system

A

apparatus in which substances cannot enter or leave the reaction mixture during a reaction

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4
Q

compound ion

A

an ion formed when a group of atoms loses of gains electrons

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5
Q

diatomic molecule

A

molecule containing two atoms

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6
Q

excess

A

when a reactant is present in an amount greater than that needed to react with the other reactant

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7
Q

half equation

A

a type of chemical equation that models the change that happens to one reactant in a reaction

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8
Q

ionic equation

A

a type of chemical equation that models how oppositely charged ions form an ionic compound

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9
Q

law of conservation of mass

A

the principle that states that the total mass stays the same during a chemical reaction, because atoms are not created or destroyed during a chemical reaction

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10
Q

limiting reactant

A

a reactant present in an amount less that that needed to react completely with the other reactant in a chemical reaction

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11
Q

molar mass

A

the mass in grams of one mole of a substance

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12
Q

mole

A

amount of substance that contains the same number of particles (6.02 × 1023) as there are atoms in 12.0 g of 12C

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