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Chem LEC > LEC MOD 3 > Flashcards

LEC MOD 3 Flashcards

1
Q

A written statement that uses chemical symbols and chemical formulas instead of words to describe the changes that occur in a chemical rxn

A

Chemiical Equation

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2
Q

starting material in a chem reaction that undergoes change

A

Reactants

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3
Q

what does the meaning of arrow in a chem equation?

A

to produce

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4
Q

substance produce as a result of chem rxn

A

products

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5
Q

what does the plus sign mean in a chem equation?

A

reacts with and with

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6
Q

monoatomic

A

He,Ne,Ar,Kr,Xe

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7
Q

Diatomic

A

H2, O2, N2, F2, Cl2, Br2, I2

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8
Q

Tetraatomic

A

P4, As4

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9
Q

when elements ends with suffixes -ggen and -ine, what are their classification?

A

Diatomic

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10
Q

equation that has the same number of atoms on each element involved in the reaction on each side of the equation

A

Balanced Chemical equation

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11
Q

law of conservation of mass

A

atoms are neither created nor destroyed

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12
Q

process in which at least one new substance is produced as a result of chemical change

A

Chemical reactions

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13
Q

evidences of chemical change

A

color change
precipitate
gas and heat
odor change

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14
Q

Synthesis reaction; single product is produced from two or more reactants

A

Combination; A + B=AB

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15
Q

single compound breaks into 2 or more simpler substance

A

Decomposition; AB= A+B

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16
Q

AKA single displacement rxn; atom or molecules replaces an atom from a compound

A

Single replacement rxn;A+BC=Ac+B

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17
Q

two substances exchange parts with one another and form two different substancess

A

Double replacement; AB+CD=AD+CB

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18
Q

occurs when two ionic compounds are dissolved in h2o and form new ionic compound that does not dissolve

A

precipitation

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19
Q

“acid-base reaction”; an aquaeous acid-base rxn generally produces water and salt

A

Neutralization

20
Q

reaction between substance and O2 that evolves to heat and light

A

CH+O2=CO2+H2O+fire

21
Q

determination of the dimensionss,capacity, quantity or extent of something

A

Measurement

22
Q

a measure of the total quantity of matter in an object

23
Q

basic unit of mass in metric system

24
Q

a measure of the amount of space

25
Q

basic unit of volume in MS

26
Q

a measure that determines the distance between two points

27
Q

basic unit of length in MS

28
Q

digits in a measurement that are kinown with certainty plus one digit that is estimated

A

Significant figures (sig figs)

29
Q

process of deleting unwanted digits from calculated numbers

A

Rounding off

30
Q

numerical system in which numbers are expressed in the form: A x 10^n

A

Scientifi Notation

31
Q

the sum of the atomic masses of all the atoms represented in the chemical formula of a substance

A

Formula mass

32
Q

a unit of measurement for the amount of substance

33
Q

Avogadro’s number value

A

1 mole =6.02 x 10^23 objjects

34
Q

Founder of avogadro’s no.

A

Lorenzo Amadeo Avogadro

35
Q

mass in grams of one mole of any pure substance

A

Molar mass (g/mol)

36
Q

a homogenous mixture of two or more substances with each substance with each substance retaining its own chem identity

37
Q

general properties of a solution:

A

contains a solvent and solute

has a variable compossition

properties change as the ratio of solvent ans solutw change

dissolved solutess are individual particles

solute uniformly distributed

solute can be separated by physical means such as evaporation

38
Q

contains less than the maximum amount of solute that can be dissolved under the conditions of which the solution exists; solute is greater than solvent

A

Unsaturated solution

39
Q

contains the maximum amount of solute that can be dissolved under the conditions of which the solution exists; excess solute

40
Q

solution is unstable wherein it temporarily contains more dissolved solute than the present in a saturated solution; formation of crystals; more excess solute

A

Supersaturated solution

41
Q

solution containss a small solute; solute

A

Dilute solution

42
Q

contains large amount of solute; Solute>solvent

A

Concentrated solution

43
Q

solution wherein water is solvent; water=solvent

A

Aqueous solution

44
Q

substance other than water is the solvent

A

Non-Aqueous solution

45
Q

maxmum amount of solute that will dissolve in a given amount of solvent under a given set of conditions; like dissolves like

46
Q

the number of moles of that species that is contained in 1 liter of the solution

A

Molarity mol/L

formula: Moles of solite/ liters of solution

47
Q

the process in which more solvent is added to a solution in order to lower the concentration

A

Dilution

formula: C1 V1= C2V2

Chem LEC (8 decks)

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