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Chemistry > C3 > Flashcards

C3 Flashcards

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1
Q

What is the law of conservation of mass?

A

No atoms are lost or made during a chemical reaction so the mass of products equal the mass of reactants

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2
Q

What are ionic compounds made of?

A

Metals reacting with non metals

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3
Q

Metals form what ions?

A

Positive

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4
Q

What are negative ions typically formed from?

A

Metals

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5
Q

What is iron an example of?

A

A transition metal

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6
Q

What are transitions metals?

A

Groups of elements in the periodic table that have unique properties and are found in the middle of the table

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7
Q

Examples of metal ions that are positive

A

Hydrogen - H+
Ammonium - NH*4+

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8
Q

In an ionic compound the charged of the overall ions have to what?

A

Cancel out to leave an overall charge of zero

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9
Q

How do you calculate percentage by mass of an element?

A

Total relative atomic mass of the atoms
———————————— x 100
Relative formula mass (Mr) of compound

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10
Q

What is avagadros number?

A

6.02 x 10 ^23

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11
Q

What is the relative formula mass?

A

The mass of a compound is the sum of the relative atomic masses of the atoms in the numbers shown in the formula

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12
Q

What does the percentage by mass tell us?

A

What percentage of the relative formula mass is due to one of the elements in a compound

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13
Q

What is the equation for the number of moles?

A

Mass / relative atomic mass

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14
Q

What is the limiting reactant?

A

The reactant that is fully used up

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15
Q

If one mole of magnesium is required to make one mole of magnesium chloride, but we use 0.5 moles of magnesium. How many moles of magnesium chloride will we make?

A

0.5 moles

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16
Q

What does concentration tell us?

A

The mass of a solute in a given volume of solution

17
Q

What is a solute?

A

A chemical that is dissolved in a solvent

18
Q

One unit of concentration is what?

A

g/dm^3

19
Q

What is the equation for concentration?

A

Mass / volume

20
Q

If we increase the mass of solute and keep the volume the same, what happens to the concentration?

A

It increases

21
Q

If we increase the volume of solution and keep the mass of the solute, the same, what happens to the concentration?

A

It will decrease

Chemistry (6 decks)

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