Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chemistry > C3 > Flashcards

C3 Flashcards

You may prefer our related Brainscape-certified flashcards:
AP® Chemistry flashcards Periodic Table flashcards Chemistry 101 flashcards Organic Chemistry 101 flashcards
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 the products = the mass of the reactants.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What charge do metals form as ions?

A

Positive ions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How to find the formula of ionic compounds?

A

Find the charges and make sure they cancel out.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Define relative atomic mass

A

Average mass of the isotopes of that element weighed to take into account the abundance of each isotope.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Define relative formula mass of a compound

A

The sum of the relative atomic masses of the atoms in the numbers shown in the formula (has no units).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How to calculate percentage by mass?

A
  1. Find the relative formula mass. 2. total RAM of the atoms of that element / Mr of the compound * 100
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Define mole

A

An amount of a substance that contains the Avogradro number of particles - 6.02 * 10^23

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How to find the number of moles?

A

Number of moles = Mass (g) / RAM (Ar) or RFM (Mr)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How to use moles to balance equations?

A

Find the moles of each substance (mass / Mr) and then find the lowest possible ratio by dividing all of them by the smallest number.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Calculate the number of moles of atoms in one mole of water molecules.

A

1 molecule of water contains 3 atoms so 1 mole of water molecules contains 3 moles of atoms.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Calculate the number of atoms in one mole of hydrogen chloride.

A

2 x 6.03 * 10^23 = 1.204 * 10^24 atoms.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How to calculate the number of atoms in a given mass of a substance?

A

Find the number of moles and then multiply that by number of atoms and then by Avogadro’s constant.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How to calculate the mass of a substance produced from a given mass on another substance and unlimited mass of another?

A
  1. Find the number of moles by dividing the given mass by the Mr. This is the same as the product. 2. Multiply the number of moles in the product by the Mr to find the mass.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Define limiting reactant

A

The reactant that is fully used up.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Define excess reactant

A

The reactant that is not fully used up.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Define concentration

A

Gives us the mass of a solute (water dissolved in a solvent) in a given volume of solution.

17
Q

How to work out concentration (g/dm^3)?

A

Mass (g) / volume (dm^3)

18
Q

How do we increase the concentration?

A

Increase the mass of the solute and keep the volume the same.

19
Q

How do we decrease the concentration?

A

Increase the volume and keep the mass of the solute the same.

Chemistry (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions