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CHM020 - Analytical Methods for Biology > Chapter 0a > Flashcards

Chapter 0a Flashcards

1
Q

work in crime laboratories where they analyeze bodily fluids and tissue samples collected by the crime scene investigators

A

forensic scientists

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2
Q
  • study of composition, structure, properties, and reactions of matter
  • happens all around you every day
A

chemistry

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3
Q

undergo a chemical reaction when dropped in water

A

antacid

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4
Q

another word for all substances that make up our world

A

matter

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5
Q
  • substances that have the same composition and properties wherever found
  • often substances made by chemists that you use everyday
A

chemicals

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6
Q

chemicals in toothpaste

A
  1. calcium carbonate
  2. sorbitol
  3. sodium lauryl sulfate
  4. titanium dioxide
  5. triclosan
  6. sodium fluorophosphate
  7. methyl salicylate
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7
Q

used as an abrasive to remove plaque

A

calcium carbonate

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8
Q
  • prevents loss of water and hardening of toothpaste
  • sweetener
A

sorbitol

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9
Q

used to loosen plaque

A

sodium lauryl sulfate

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10
Q

makes toothpaste white and opaque

A

titanium dioxide

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11
Q

inhibits bacteria that cause plaque and gum disease

A

triclosan

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12
Q

prevents formation of cavities by strengthening tooth enamel with fluoride

A

sodium fluorophosphate

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13
Q

gives toothpaste a pleasant wintergreen flavor

A

methyl salicylate

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14
Q

does the sunlight contain chemicals

A

no. it is energy

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15
Q

probably best known for working out the nature of the chemical bond

A

Linus Pauling

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16
Q

set of general principles that helps to describe how a scientist thinks

A

scientific method

17
Q

steps in scientific method

A
  1. observations
  2. hypothesis
  3. experiments
  4. conclusion
18
Q

modified if the results of the experiment do not support it

A

hypothesis

19
Q

identify:
during your visit to the gym, your trainer records that you ran for 25 minutes on the treadmill

A

observation

20
Q

identify:
scientific studies show that exercising lowers blood pressure

A

conclusion

21
Q

identify:
your doctor thinks that your weight loss is due to increased exercise

A

hypothesis

22
Q

average number of hair on scalp

A

1 x 10^5 hairs

23
Q

approx. width of hair

A

8 x 10^-6 m

24
Q

two parts of the scientific notation

A
  1. coefficient
  2. power of 10
25
Q

greater than 1

26
Q

less than 1

27
Q

guide to writing a number in scientific notation

A
  1. move decimal point to obtain a coefficient that is at least 1 but less than 10
  2. express number of places moved as power of 10
  3. write the product of coefficient multiplied by power of 10
28
Q

write in scientific notation:
64 000

A

6.4 x 10^4

29
Q

write in scientific notation:
0.021

A

2.1 x 10^-2

CHM020 - Analytical Methods for Biology (22 decks)

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