chem as level 1

Question 1

atom

Answer 1

smallest unit of matter that can take part in a chemical reaction

Question 2

element

Answer 2

pure substance that is made up of only 1 type of atom

Question 3

ion

Answer 3

charged particle

Question 4

molecule

Answer 4

substance made up of 2 or more atoms(unit of a pure substance)

Question 5

compound

Answer 5

pure substance made up of 2 or more elements that are chemically combined

Question 6

molecular formula

Answer 6

formula that shows the exact number of each type of atom in a molecule of a compound

Question 7

empirical formula

Answer 7

formula that shows the simplest ratio in which atoms combine in a molecule of a compound

Question 8

acid+metal

Answer 8

salt+h2

Question 9

metal oxide+acid

Answer 9

salt+h2o

Question 10

metal hydroxide+acid

Answer 10

salt+h2o

Question 11

alkali+acid

Answer 11

salt+h2o

Question 12

metal carbonate+ acid

Answer 12

salt+h2o+co2

Question 13

combustion
(grp1)

Answer 13

respective oxide
(peroxide)

Question 14

metal+water

Answer 14

metal hydroxide+h2

Question 15

metal peroxide+water

Answer 15

metal hydroxide+o2

Question 16

metal oxide+water

Answer 16

metal hydroxide

Question 17

displacement reaction

Answer 17

more reactive replaces less reactive

Question 18

decomposition of nitrates
(grp 1 ex li)

Answer 18

metal oxide+no2+o2
(metal nitrate +o2)

Question 19

decomposition of carbonates
(grp 1 ex li)

Answer 19

metal oxide+co2
(don’t decompose)

Question 20

heat+hydrogen carbonate
(grp1)

Answer 20

metal oxide+co2+h2o
(metal carbonate+h2o+co2)

Question 21

metal+halogen

Answer 21

salt

Question 22

moles

Answer 22

amount of substance that contains 6.02x10^23 particles

Question 23

mole formula

Answer 23

mass/rfm
conc x volume
volume/24

Question 24

concentration

Answer 24

amount of substance present per unit volume or mass

Question 25

conc formula

Answer 25

mole/volume

Question 26

ram

Answer 26

average mass of an ATOM compared to 1/12th of a c12 atom

Question 27

molar mass

Answer 27

mass of 1 mole of substance UNIT - gmol^-1

Question 28

rmm

Answer 28

average mass of a MOLECULE as compared to 1/12th of a c12 atom

Question 29

rfm

Answer 29

sum of ram of all atoms in a chemical formula

Question 30

%by mass

Answer 30

conc represented as a ratio of mass of solute to mass of solution x 100

Question 31

%by volume

Answer 31

ratio of volume of a fluid to total volume x 100

Question 32

test for co2

Answer 32

bubble co2 through ca(oh)2 white ppt

Question 33

test for sulfates

Answer 33

add ba ions baso4 is formed white ppt

Question 34

test for halides

Answer 34

silver ions ppt

Question 35

Dilution

Answer 35

Mc x Vc = Md x Vd

Question 36

ppm

Answer 36

volume /total volume x 10^6

Question 37

%yield

Answer 37

actual yield/theoretical yield x 100

Question 38

atom economy

Answer 38

mass of desired / mass of total x 100

Question 39

molar volume at rtp

Answer 39

24 dm3

Question 40

molar volume at stp

Answer 40

22.4dm3

Question 41

ideal gas eqn

Answer 41

PV=nRT