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Chemistry > CH1 Chemistry and measurements > Flashcards

CH1 Chemistry and measurements Flashcards

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1
Q

define chemistry

A

the study of the properties & behavior of matter

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2
Q

Matter is…

A

has mass and occupies space

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3
Q

property is …

A

any recognizable characteristic distinguishing it from other matter (100 elements)

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4
Q

Elements..

A

made up of unique atoms

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5
Q

Molecules are…

A

combinations of atoms in specific shapes

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6
Q

Macroscopic =

A

observable

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7
Q

Gas

A

no fixed volume/ shape (conforms to container/ compressible)

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8
Q

Liquid

A

Volume independent of container (no fixed shape/ incompressible)

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9
Q

Solid

A

Volume and shape independent of container (rigid/ incompressible)

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10
Q

Compounds…

A

combinations of elements (ex. H2O)

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11
Q

Law of Constant composition/ proportions

A

compound always consists of the same combination of elements

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12
Q

Mixtures

A

a combination of 2+ pure substances

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13
Q

Heterogenous mixtures

A

no uniform composition/ properties/ appearance

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14
Q

Homogenous mixtures

A

uniform throughout (aka SOLUTIONS)

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15
Q

Physical properties of matter

A

measured without changing the substance (no chemical change)

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16
Q

Chemical properties

A

how substances react or change to form different substances

17
Q

Intensive properties

A

dont depend on the amount of substance present (temp./ melting pt./ density)
** give idea about the composition**

18
Q

Extensive properties

A

depend on QUANTITY. (ex. mass/ volume)

19
Q

Filtration

A

remove solid from liquid

20
Q

Distillation

A

boil off components from mixture

21
Q

The SCIENTIFIC METHOD

A
  1. Collect data
  2. Develop Hypothesis
  3. Test Hypo.
  4. Analyze & draw conclusion
22
Q

Level of Confidence (LOC) - Hypothesis

A

Proposed explanation (50% confidence)

23
Q

LOC- Theory

A

Broad generalization (90-95%)

24
Q

LOC- Law

A

Universal Truth (100%)

25
Q

Mass defined

A

Measure of the amount of an object (gravity dependent)

26
Q

Temperature

A

flows from high to low temps`

27
Q

Kelvin scale

A

freeze; 273.15 K

Boil ; 373.15 K

28
Q

cm3 same as

A
  • cc

- mL

29
Q

dm3 same as

A

L

*L is n ot a SI unit

30
Q

Density =

A

Mass/ volume (DMV)

31
Q

Density unit =

A

g/cm3 OR g/ml

32
Q

Precision

A

how well measure quantities agree with each other

33
Q

Accuracy

A

measure quantities agree with true value

34
Q

Addition and subtraction (sig. figs)

A

least number of decimal places

35
Q

Multiplication/ division

A

report to least number of sig. figs

Chemistry (11 decks)

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