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chem definitions > chem as level 1 > Flashcards

chem as level 1 Flashcards

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1
Q

atom

A

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

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2
Q

element

A

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

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3
Q

ion

A

charged particle

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4
Q

molecule

A

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

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5
Q

compound

A

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

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6
Q

molecular formula

A

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

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7
Q

empirical formula

A

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

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8
Q

acid+metal

A

salt+h2

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9
Q

metal oxide+acid

A

salt+h2o

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10
Q

metal hydroxide+acid

A

salt+h2o

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11
Q

alkali+acid

A

salt+h2o

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12
Q

metal carbonate+ acid

A

salt+h2o+co2

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13
Q

combustion
(grp1)

A

respective oxide
(peroxide)

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14
Q

metal+water

A

metal hydroxide+h2

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15
Q

metal peroxide+water

A

metal hydroxide+o2

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16
Q

metal oxide+water

A

metal hydroxide

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17
Q

displacement reaction

A

more reactive replaces less reactive

18
Q

decomposition of nitrates
(grp 1 ex li)

A

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

19
Q

decomposition of carbonates
(grp 1 ex li)

A

metal oxide+co2
(don’t decompose)

20
Q

heat+hydrogen carbonate
(grp1)

A

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

21
Q

metal+halogen

A

salt

22
Q

moles

A

amount of substance that contains 6.02x10^23 particles

23
Q

mole formula

A

mass/rfm
conc x volume
volume/24

24
Q

concentration

A

amount of substance present per unit volume or mass

25
Q

conc formula

A

mole/volume

26
Q

ram

A

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

27
Q

molar mass

A

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

28
Q

rmm

A

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

29
Q

rfm

A

sum of ram of all atoms in a chemical formula

30
Q

%by mass

A

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

31
Q

%by volume

A

ratio of volume of a fluid to total volume x 100

32
Q

test for co2

A

bubble co2 through ca(oh)2
white ppt

33
Q

test for sulfates

A

add ba ions baso4 is formed white ppt

34
Q

test for halides

A

silver ions
ppt

35
Q

Dilution

A

Mc x Vc = Md x Vd

36
Q

ppm

A

volume /total volume x 10^6

37
Q

%yield

A

actual yield/theoretical yield x 100

38
Q

atom economy

A

mass of desired / mass of total x 100

39
Q

molar volume at rtp

A

24 dm3

40
Q

molar volume at stp

A

22.4dm3

41
Q

ideal gas eqn

A

PV=nRT

chem definitions (3 decks)

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