Chemistry

Question 1

What is chemistry?

Answer 1

Chemistry is the science that deals with matter (properties, composition, structure, interactions) and the energy involved in these interactions.

Question 2

18th Group Name?

Answer 2

Inert Gases

Question 3

How many atoms are in HO2

Answer 3

1 Hydrogen Atom

2 Oxygen Atoms

Question 4

Is KI an Element or Compound?

Answer 4

Compound, Potasisum and Iodine

Question 5

What atoms are in MgCl3

Answer 5

1 Magnesene atom

3 Chlorine Atoms

Question 6

What were the two sets of information that chemists were trying to put
together in designing the periodic table?

Answer 6

The masses of the elements, and the chemical families.

Question 7

An element

Answer 7

A pure substance with only one kind of atom

Question 8

Period

Answer 8

A horizontal Row across on the periodic table

Question 9

Group

Answer 9

A vertical Row on the periodic table

Question 10

Family

Answer 10

A coloum/group of atoms with similar chemical properties

Question 11

Valence shell

Answer 11

The outermost electrons in an element

Question 12

What did Mendeleev do about the “missing elements” in his periodic table?

Answer 12

He left spaces for them in the future

Question 13

What was another reason why it was difficult to create an organization that made sense?

Answer 13

Many elements had not yet been discovered.

Question 14

Elements _ exist naturally

Elements _ have only ever exist in a labratory

Answer 14

Elements 1 to 94 exist naturally
Elements 95 to 224 have only ever been synthesized in a laboratory
(The bottom two rows Lathaides and Actinides)

Question 15

How do you determine the number of electrons in an Element?

Answer 15

The period number is equal to the number of electron shells. (Except transition metals)

Question 16

How do you know how many Valence Electrons are in an Element?

Answer 16

Elements in the same column have the same number of electrons in their outermost shell called Valence Electrons. (Except transition metals)

Question 17

3 categories of matter

Answer 17

Metals, non-metals, metaliods

Question 18

How do you tell how many Protons are in an Element?

Answer 18

of protons = Atomic Number

Question 19

How do you tell how many Electrons are in an Element?

Answer 19

of electrons = Atomic Number

Question 20

How do you tell how many neutrons are in an Element?

Answer 20

of Neutrons = Atomic Mass – Atomic Number

Question 21

4 statements of Daltons Atomic Theory

Answer 21

Dalton Atomic Theory stated:

1. All matter is made up of small particles called atoms.
2. Atoms cannot be created, destroyed or divided into smaller
   particles.
3. All atoms of the same element are identical, but they are different
   from the atoms of other elements.
4. Compounds are created when atoms of different elements link
   together in definite proportions.