chemistry

Question 1

Anything that occupies space and has mass

Answer 1

Matter

Question 2

What are the weights of measurement of:

length, mass, time, temperature?

Answer 2

Length: meter (m)
Mass: kilograms (kg)
Time: seconds (sec)
Temperature: Kelvin (K)

Question 3

What are the classifications of Matter and defined each?

Answer 3

Element - simplest form of matter, 1 kind of material or atom
Compound - substances composed of two or more elements united chemically in definite proportion
Mixture - composed of 2 or more substances that are not chemically combined

Question 4

What are the different types of Metals and define each and the mnemonics of metalloids

Answer 4

Metals
Non metals
Metalloids

Question 5

What is the meaning of chemical bond?

Answer 5

Chemical bond is the forces that holds atoms together to make compounds or molecules

Question 6

What are the two types of compounds and define each?

Answer 6

ionic bond - transfer of electrons

covalent bond - sharing of electrons

Question 7

Ionic Bonding Mnemonics? and explain the ionic bonding?

Answer 7

MetLoPos

NonMetGaNe

Question 8

What is the difference between Nonpolar covalent bond and polar covalent bond?

Answer 8

nonpolar - shared equally

polar - not share equally because of unequal attraction

Question 9

What is the difference between inorganic compound and organic compound?

Answer 9

inorganic - contains few carbons and other elements

organics - contains carbon atoms in the molecules

Question 10

What are the properties of colloids?

Answer 10

Brownian movement - zigzag movement of colloidal properties due to perfectly elastic collision
Tyndall effect - Light Scattering
Electrically charged - used in gel electrophoresis for absorption

Question 11

What is the classification of matter and the difference between each?

Answer 11

solids
liquids
gas
plasma
liquid crystals

Question 12

110

Answer 12

Darmstadtium

Question 13

111

Answer 13

Roentgenium

Question 14

112

Answer 14

Copernicium

Question 15

114

Answer 15

Flerovium

Question 16

116

Answer 16

Livermorium

Question 17

What is the meaning of Chemical Reaction?

Answer 17

Chemical reaction occurs when the outermost or valence electrons around the nucleus interacts
- entails the removal of valence electrons, adding electrons to a partly filled valence shell, sharing a pair of electrons between two atoms

Question 18

Reactants

Answer 18

substance that enter into a chemical reactions

Question 19

Products

Answer 19

substance that are formed after a chemical reaction

Question 20

Law of Conservation of Mass

Answer 20

a law that states that chemical equation has to be consistent. The same number of atoms of each element must appear on both sides of the equation. FUNDAMENTAL LAW OF BALANCING CHEMICAL EQUATION

Question 21

Involves the reaction of two or more substances that react to form one compound

Answer 21

Direct Union/Synthesis/Composition

Question 22

Once compound decomposes to form two or more substances or simpler substances

Answer 22

Decomposition/Analysis

Question 23

Reaction in which one element replaces similar element in a compound

Answer 23

Single Relplacement Reaction

Question 24

Reaction in which 2 compounds exchange partners

Answer 24

Double displacement

Question 25

atoms with same number of protons

Answer 25

isotopes

Question 26

atoms with same number of neutrons

Answer 26

isotones

Question 27

atoms with same number of mass numbers

Answer 27

isobars

Question 28

atomic number

Answer 28

number of protons | and number of electrons

Question 29

mass number

Answer 29

number of protons plus number of neutrons

Question 30

protons

Answer 30

atomic number

Question 31

electrons

Answer 31

atomic numbers

Question 32

neutrons

Answer 32

mass number - atomic number

Question 33

electrons

Answer 33

protons - charge

Question 34

matter is made up of small indivisible particles

Answer 34

democriyus

Question 35

billiard ball model which is disapproved

Answer 35

john dalton

Question 36

discovered electron using CRT; raisin bread model / pudding model

Answer 36

jj thompson

Question 37

discovered proton; gold film experiement: atom is mostly an empty space

Answer 37

ernest rutherford

Question 38

planetary model

Answer 38

neil bohr

Question 39

quantum mechanim model

Answer 39

erwin schrodinger

Question 40

discovered neutron

Answer 40

james Chadwick

Question 41

atomic weight

Answer 41

weighted average of the mass numbers of the isotopes of the elements

Question 42

define allotrope

Answer 42

the existence of a chemical element in two or more forms; atoms of different elements can link together in different ways to form substances with different properties

Question 43

allotropes of carbon

Answer 43

diamond and graphite

Question 44

allotropes of oxygen

Answer 44

[O] - nascent o2 - molecular o3 - ozone