Chemistry-flashcards whole year

Question 1

physical changes–>

Answer 1

*Create no new substances.
*Are usually easy to reverse.
*Absorb or release small amounts of energy

Question 2

Chemical changes–>

Answer 2

*Create new substances.
*Are usually difficult to reverse.
*Absorb or release large amounts of energy.

Question 3

Test for water

Answer 3

*Anhydrous copper (II) sulphate: turns from white to blue
This tells you that water is present, but not how pure it is.
Two physical tests for water:
*Melting point (MP) = 0 oC
*Boiling point (BP) = 100 oC
Purer water matches these properties more closely

Question 4

Definition of an element

Answer 4

one type of atom

Question 5

Definition of a compound

Answer 5

A compound is a substance containing more than one type of atom, chemical bonded together

Question 6

Definition of a mixture

Answer 6

two or more substances that are mixed together but not chemically combined

Question 7

How can compounds be formed

Answer 7

Compounds can often be formed by heating their elements together. e.g. For example: if you heat the elements zinc and sulphur, they form the compound zinc sulphide

Question 8

Solute

Answer 8

The substance which is going to be dissolved

Question 9

solvent

Answer 9

The liquid which is going to do the dissolving

Question 10

solution

Answer 10

The resulting mixture of solute dissolved in solvent

Question 11

soluble

Answer 11

A substance which can be dissolved

Question 12

saturated

Answer 12

A solution in which no more solute can be dissolved

Question 13

insoluble

Answer 13

A substance which cannot be dissolved

Question 14

suspension

Answer 14

A solid floating in a liquid because it cannot dissolve

Question 15

Salt = ?
Water =?
Saltwater = ?

Answer 15

*Salt = solute, it’s going to be dissolved
*Water = solvent, it’s going to do the dissolving
*Saltwater = solution, formed because some of the salt dissolves in the water

Question 16

what do we measure solubility in

Answer 16

We measure solubility in g per 100 g of solvent.

Question 17

solubility lines on graph=
on the line =?
under the line=?
above the line=?

Answer 17

on the line= saturated
under the line= soluble
above the line= insoluble

Question 18

what is the relative mass of a proton

Answer 18

1.000

Question 19

what is the relative mass of a neutron

Answer 19

1.000

Question 20

what is the relative mass of an electron

Answer 20

0.0005

Question 21

now bozo whats the relative charge of a proton bet you dont know this one

Answer 21

+1 IF YOU DONT PUT THE SIGN INFRONT YOU WILL WAKE UP IN THE BACKROOMS XOXO

Question 22

whats the relative charge of a neutron

Answer 22

0 CUZ ITS NEUTRAL?!

Question 23

what’s the relative charge of a electron

Answer 23

-1 DONT FORGET THE SIGN DUMMY

Question 24

What are in the nucleus

Answer 24

protons and neutrons!

Question 25

what are in the shells (energy levels)

Answer 25

ELECTRONS #ALONE#DEPRESSED

Question 26

WHAT IS THE ATOMIC NUMBER

Answer 26

THE NUMBER OF PROTON

Question 27

WHAT IS THE MASS NUMBER

Answer 27

THE TOTAL NUMBER OF NEUTRONS ANDDDD PROTONS

Question 28

28
Si
14
How many neutrons?

Answer 28

14 (the bottom number is the number of protons and protons only) aka the atomic number

Question 29

28
Si
14
How many neutrons?

Answer 29

14 since the mass number is protons AND neutrons so the mass number minus the atomic number will give us 14 ITS SO SIMPLE BRO

Question 30

Number of electrons=?

Answer 30

number of electrons= number of protons

Question 31

what are isotopes (istg if you dont include them two things your fish is gonna drown you)

Answer 31

isotopes are ATOMS that have the SAME NUMBER OF PROTONS BUT DIFFERENT NUMBER OF NEUTRONS

Question 32

isotopes: Mass number Abundance
chlorine-35¦ 35 ¦ 75%
chlorine-37¦ 37 ¦ 25%

Answer 32

RAM= (75%x35) + (25%x37)
—————————— = 35.5
100

Question 33

What is RAM

Answer 33

Relative atomic mass is the average mass of an atom of an element, taking into account the different masses of each isotope