elements and compounds

Question 1

Compounds that are physically combined form another kind of matter known as

Answer 1

mixtures

Question 2

Both elements and compounds participate in ———— to create ew compounds

Answer 2

Chemical reaction

Question 3

Compounds that are physically combined form another kind of matter known as

Answer 3

Mixtures

Question 4

the simplest form of matter
made up of only one kind of atom
elements of different kinds also differ in the atoms that make them up

Answer 4

Element

Question 5

composed of two or more different elements that are combined in a fixed ratio by a chemical reaction

Answer 5

Compound

Question 6

How many elements known to exist arranged in the periodic table of elements

Answer 6

118

Question 7

cannot be decomposed into simpler forms by physical or chemical means

Answer 7

Elements

Question 8

React to form new substances

Answer 8

Element

Question 9

Ennumerate element symbol:

Hydrogen

Answer 9

H

Question 10

BORON SYMBOL

Answer 10

B

Question 11

Helium

Answer 11

HE

Question 12

Lithium

Answer 12

Li

Question 13

Cobalt

Answer 13

Co

Question 14

Antimony

Answer 14

Sb

Question 15

Copper

Answer 15

Cu

Question 16

Gold

Answer 16

Au

Question 17

Four new elements have been officially added to the periodic table of elements in June of 2016. The four new elements namely (NMTO)

Answer 17

Nihonium, Miscovium, Tennessine, Organnessine

Question 18

is the arrangement of all known elements according to their chemical properties.

Answer 18

The periodic table of elements

Question 19

properties repeat themselves every few elements

Answer 19

pERIODIC

Question 20

elements arranged in rows and columns
columns:
rows:

Answer 20

columns: groups
rows: periods

Question 21

Periodic Table
shows the division of elements to ————–, ——————-. AND —————

Answer 21

METALS, NON-METALS, METALLOIDS

Question 22

lustrous solid at room temperature (except Hg, which is liquid)
hardness and tensile strength
ductility and malleability
good heat/electricity conductors
high melting point/boiling point

Answer 22

Metals

Question 23

General properties:
either solid or gas at room temperature (except Br2, which is liquid)
brittle and dull solids
poor conductors of heat and electricity
low melting and boiling points

Answer 23

Non-metals

Question 24

exhibit properties of both metals and nonmetal
conducts heat and electricity but not as good as how metals act as conductors

They are also semi-conductors

Answer 24

Metalloids/Semimetals

Question 25

a material that can conduct some electricity better than an insulator some can conduct electricity as much as metals

Answer 25

Semiconductors

Question 26

Compound a pure substance that is made up of different elements atoms are joined together by

Answer 26

chemical bonds

Question 27

the process of creating compounds

Answer 27

Chemical Reaction

Question 28

kinds od chemical reaction

Answer 28

exothermic or endothermic

Question 29

a chemical reaction that gives off heat (i.e. combustion reaction)

Answer 29

Exothermic Reaction

Question 30

a chemical reaction that absorbs heat as it occurs, allowing it to produce new compounds (i.e. photosynthesis)

Answer 30

endothermic reaction

Question 31

Compounds may be categorized based on the presence of the element carbon: ------ may be categorized based on the type of bonding between the constituent elements: ------------

Answer 31

organic or inorganic, ionic or covalent

Question 32

a class of compounds in which one or more carbon atoms are bonded to other elements, most commonly hydrogen, oxygen, or nitrogen

Answer 32

Organic Compounds

Question 33

a class of compounds lacking carbon-hydrogen bonds everything else except carbon comprise most of Earth’s crust

Answer 33

Inorganic Compounds

Question 34

compounds that exhibit ionic bonding

Answer 34

Ionic Compounds

Question 35

compounds that exhibit covalent bonding electron sharing

Answer 35

Covalent Compounds

Question 36

are forms of matter that have a definite or fixed composition. They can be classified as elements or compounds

Answer 36

Pure Substances