Unit 3 Flashcards

1
Q

What is the conservation of mass?

A

in a chemical reaction, atoms are not created or destroyed, just rearranged, so total mass before = total mass after the reaction

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2
Q

When a metal forms a metal oxide, why does the mass increase?

A

atoms from gaseous oxygen have been added

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3
Q

When an acid reacts with a metal, why does the mass decrease?

A

a gas is produced and escapes

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4
Q

What is relative formula mass?

A

the sum of the relative atomic masses of each atom in a substance

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5
Q

What are the four state symbols and what do they stand for?

A

(s) solid
(l) liquid
(g) gas
(aq) aqueous or dissolved in water

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6
Q

How can you tell when a symbol equation is balanced?

A

the number of atoms of each element is the same on both sides

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7
Q

What is a unit for concentration?

A

g/dm3

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8
Q

Which formula is used to calculate concentration from mass and volume?

A

concentration=mass/volume

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9
Q

Which formula is used to calculate volume from concentration and mass?

A

volume=mass/concentration

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10
Q

Which formula is used to calculate mass from concentration in g/dm3 and volume?

A

mass (g) = concentration (g/dm3) × volume (dm3)

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11
Q

How can you convert a volume reading in cm3 to dm3?

A

divide by 1000

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12
Q

If the amount of solute in a solution is increased, what happens to its concentration?

A

increases

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13
Q

If the volume of water in a solution is increased, what happens to its concentration?

A

decreases

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