Chemistery

Question 1

Element

Answer 1

A natural occurring substance and is made up of its own atoms.

Question 2

Compound

Answer 2

Are two or more elements chemically combined together.

Question 3

Mixture

Answer 3

two or more elements not chemically combined together.

Question 4

what were Levoister’s discoveries

Answer 4

some elements and he planned the periodic table.

Question 5

When did Levoister’s discoveries come out?

Answer 5

1789

Question 6

When were triads discovered?

Answer 6

1817

Question 7

When were Newland’s 8 similarities came out?

Answer 7

1857

Question 8

When was Meendelev’ s first periodic table come out?

Answer 8

1887

Question 9

When isotopes and atomic number found?

Answer 9

1913

Question 10

The first scientist to arrange elements in order of atomic weight?

Answer 10

Meendelev

Question 11

Molecule

Answer 11

are made up of two or more atoms. It can be formed by two atoms of the same element or by atoms from different elements.

Question 12

What is the full form of AR and what does it mean?

Answer 12

Relative atomic mass tells you the number of protons and neutrons.

Question 13

Atomic mass

Answer 13

tells you the number of protons and electrons

Question 14

isotopes

Answer 14

an atom of the same element but different number of neutrons

Question 15

what are the changes and not and why if you are an isotope

Answer 15

chemically reactions are the same because the numbers of electrons and protons are the same. Physical properties are affected like melting point and density because of the changes of neutrons.

Question 16

How many electrons are needed in the outer shell to be more stable?

Answer 16

8

Question 17

which noble gases can hardly make compounds?

Answer 17

Krypton(Kr) and Xenon(Xe)

Question 18

which noble gases are lighter than air?

Answer 18

Helium, Neon

Question 19

which noble gases are heavier than air?

Answer 19

Argon and Krypton

Question 20

Are noble gases in colors

Answer 20

No, they are transparent

Question 21

What is xenon used for?

Answer 21

in car lights

Question 22

What happens when an electric current goes through neon?

Answer 22

It glows orange

Question 23

Which noble gas is highly radioactive?

Answer 23

Radon(Rn)

Question 24

What are other names for noble gases?

Answer 24

Group0, Group18

Question 25

What happens is you go down the noble gases(5)

Answer 25

``` Increases: the atomic number number of shells Size of the atom Density boiling point ```

Question 26

sublimation

Answer 26

changing from a solid to gas directly

Question 27

What happens to Iodine when it is heated gently?

Answer 27

Sublimation happens

Question 28

Does the melting point and the size decrease or increase as you go down group 7

Answer 28

decrease

Question 29

what happens when two elements of group 7 react together?

Answer 29

Covalent bond forms

Question 30

what state are fluorine and chlorine at room temperature?

Answer 30

gas

Question 31

what state are Iodine at room temperature?

Answer 31

solid

Question 32

Does the RAM increase or decrease as you go down group 7?

Answer 32

increase

Question 33

what happens when halogens accept one electron in the outer shell

Answer 33

It becomes stable

Question 34

Which halogen has a reddish-brown color?

Answer 34

Bromine

Question 35

Which halogen has the highest melting point

Answer 35

Fluorine

Question 36

Which halogen is the only liquid halogen

Answer 36

Bromine

Question 37

Which halogen has the lowest melting point

Answer 37

Astatine

Question 38

Which halogen is a pale yellow/green gas?

Answer 38

Chlorine

Question 39

Which halogen is a solid

Answer 39

iodine, Astatine

Question 40

Which halogen is a pale green gas

Answer 40

Fluorine

Question 41

Which halogen is purple in color

Answer 41

Iodine

Question 42

What happens when halogens react with metals

Answer 42

Ionic bonding

Question 43

Ionic bonding

Answer 43

Really strong bonding between a non-metal and metal where the metal gives electron/s to the metal. It is really strong because it is formed from positive and negative ions.

Question 44

Covalent bonding

Answer 44

Where two or more elements share one electron to be more stable, this way they both can gain an electron.

Question 45

Describe the attraction(inter molecular) between simple molecular substances

Answer 45

they are really weak so melting points and boiling points are low. Because the inter molecular forces are really weak the covalent bond is not broken. At room temperature, most are liquids or gases.

Question 46

What are the qualities of transition metals?

Answer 46

Lustrous(bright and shiny) hard and strong high density malleable(can be bent &pressed into different shapes) ductile(can be drawn into wires) good conductors of heat and electricity high melting and boiling point except for mercury which is liquid at room temperature

Question 47

What are the qualities of transition metals compared to group 1

Answer 47

are denser | higher melting and boiling point except for mercury