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Inteo to chemistry & the mole Flashcards

(17 cards)

1
Q

how to convert from celsius to kevin

A

C+273

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2
Q

Accuracy

A

how close a measurement is to the accepted value

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3
Q

precision

A

how close several identical movements are to each other

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4
Q

qualitative

A

describable , not measurable

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5
Q

quantitative

A

numerical

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6
Q

rules for sig figs

A
  • nonzero digits ALWAYS count
  • zeros in front don’t count , like 0.05
  • between count! 5.005
  • zeros at end count ONLY if there’s a decimal point! 0.5340
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7
Q

scientific notation

A

number of zeros go to the 10th power , put a decimal point in between the first and second number. 12,500,00 , 1.25x10^7
negative 10th power moves a decimal point back. 5.67x10^-3 , 0.00567

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8
Q

physical properties

A

characteristics of a material that you can observe without changing the material. ex, color , shape , size , state

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9
Q

chemical properties

A

characteristics of matter that describe the ability for it to be transformed into a new substance. ex , flammable , nonreactive

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10
Q

physical change

A

change in a substance that does NOT involve a change in identity of a substance. ex , breaking a bottle

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11
Q

chemical change

A

chemical reaction occurs , taken place , substance changes into a new substance. new color forms for ex

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12
Q

separation techniques

A

distillation , filtration , centrifuge , chromatography

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13
Q

distillation

A

seperates solutions based on volatility or separates solid/liquid solutions

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14
Q

filtration

A

separation of solid / liquid mixture

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15
Q

centrifuge

A

separates liquids of different densities (separates solids & liquids)

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16
Q

chromatography

A

the separation of a mixture by passing it in solution , suspension , or as a vapor so that components love at different rates

17
Q

when converting k to c what do you do