week 2

Question 1

what is the chemical behaviour of an atom determined by a- no. protons b- no. neutrons c- no. and arrangement of electrons d- size of the atom

Answer 1

c

Question 2

when atoms complete the outer shell of electrons they form what bond?

Answer 2

covalent

Question 3

in a nitrogen atoms, 3 pairs of electrons are shared by 2 nitrogen atoms. what bond is this?

Answer 3

triple covalent

Question 4

If a pair of electrons is unequally shared between 2 atoms, what bond occurs?

Answer 4

polar covalent

Question 5

ions with a positive charge are called

Answer 5

cations

Question 6

ionics bonds are formed by a- atoms sharing electrons b- electrons are completely transferred c- share the electron

Answer 6

b

Question 7

the weakest bond between 2 or more atoms

Answer 7

hydrogen

Question 8

is this a reaction of decomposition?

h2 + CL 2 = 2 HCL

Answer 8

yes

Question 9

what reaction is this ?

A+B =AB

Answer 9

synthesis

Question 10

inorganic compounds that are soluble and whose ions will conduct electrical current

Answer 10

electrolytes

Question 11

the bond between sodium and chloride in the compound sodiumchloride is what bond?

Answer 11

ionic

Question 12

identify cations a- Na b-Cl c- K d- Na & Cl d- Na & K

Answer 12

d

Question 13

which one is an anion a-Na b-Cl c-K d-a&b e- a&c

Answer 13

b

Question 14

which of the following indicate one containing only trace elements a-sulphur/Cl/O b- selenium/H/Ca c-boron/O/C d- silicon/florine/tin

Answer 14

d

Question 15

when a needle is floating on the surface of a glass of water what is it called

Answer 15

surface tension

Question 16

Eg of an organic substance a-table sugar b-sodium c-table salt d-oxygen

Answer 16

a

Question 17

Eg of an inorganic substance a-fructose b-water c-lipid d-glycogen

Answer 17

b

Question 18

what element is plentiful in the human body

Answer 18

oxygen

Question 19

what element is 2nd abundant

Answer 19

carbon

Question 20

what is CO2 ?

Answer 20

carbon dioxide

Question 21

what is the molecule H2 called?

Answer 21

hydrogen

Question 22

H2O is an eg of what formular?

a-ionic b-molecular c-covalent

Answer 22

b

Question 23

a nanometre is ?

Answer 23

10-9 metre

Question 24

when electrons are transferred from one to another what bond is formed

Answer 24

ionic

Question 25

calcium has 2 electron in outer shell, when they form ions what charge would it be ? +2 / -2

Answer 25

+2

Question 26

a substance that consists entirely of atoms with the same atomic number is what?

Answer 26

element

Question 27

when electrons move around the centre at high speed it forms what?

Answer 27

electron cloud

Question 28

electrons is an atom occupy an orderly series of electron shells or ?

Answer 28

energy levels

Question 29

a __ is a combination of 2+ atoms with different physical/chemical properties

Answer 29

compound

Question 30

ions with positive charge

Answer 30

cations

Question 31

ions with negative charge

Answer 31

anions

Question 32

chemical bond between atoms were new chemical substance made is?

Answer 32

chemical reaction

Question 33

a __ is a homogeneous mixture containing a solvent and a solute

Answer 33

solution

Question 34

readily dissolve in water is ?

Answer 34

hydrophilic

Question 35

does not dissolve in water is?

Answer 35

hydrophobic

Question 36

what is a heterogeneous mixture with visible solutes that tend to settle out ?

Answer 36

suspensions

Question 37

what is a heterogeneous mixture whose solutes do not settle out ?

Answer 37

colloid

Question 38

what is 2+ mixtures components physically intermixed but not chemically bonded

Answer 38

mixtures