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chemistry > quantitive chemisty (p1) > Flashcards

quantitive chemisty (p1) Flashcards

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1
Q

What is the law of conservation of mass?

A

No atoms are lost or gained in chemical reactions, therefore the total mass of reactants = the total mass of the products

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2
Q

What are isotopes?

A

Atoms of an element with the same number of protons but different number of neutrons

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3
Q

What is the atomic number?

A

The number of protons in the nucleus of an atom

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4
Q

What is the mass number?

A

The number of protons and neutrons in the nuclues of an atom

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5
Q

What is the relative atomic mass (RAM) ?

A

The average mass of an atom of an element that takes into account the abundance of isotopes

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6
Q

What is the relative formula mass (Mᵣ)?

A

The sum of the relative atomic masses of the atoms in a molecule or compound

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7
Q

What is the equation used to calculate % mass?

A

(mass of element in compound ÷ relative formula mass) x 100

mass
——– x 100
Mr

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8
Q

What happens to the measured mass when a gas is produced in a chemical reaction?

A

Measured mass decreases

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9
Q

What is systematic error?

A

An error caused by a problem with equipment or technique

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9
Q

What happens to the measured mass when a gas is a reactant in a chemical reaction?

A

Measured mass increases

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10
Q

What is random error?

A

An error caused by unpredictable variation

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11
Q

What is a solute?

A

A solid that dissolves

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12
Q

What is a solvent?

A

The liquid in which the solid dissolves

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13
Q

What is a solution?

A

The mixture formed when a solute dissolves in a solvent

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14
Q

What are the units for concentration?

A

g/dm³

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15
Q

What is the value of 1 mole

A

6.02 x 10²³

16
Q

What is the mass of one mole of a substance equal to?

A

The relative formula mass (Mᵣ)

17
Q

What is a mole?

A

The amount of substance containing the Avogadro number of particles (6.02 x 10²³).

18
Q

What is the equation for mole?

A

Moles = Mass ÷ Mᵣ

19
Q

What is the equation for mass?

A

Mass = Moles x Mᵣ

20
Q

What is a limiting reactant?

A

The reactant that is completely used up and so limits the amount of product produced

21
Q

What is a reactant in excess?

A

The reactant that is not completetly used up in the reaction

chemistry (15 decks)

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