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Luden [163]
3 years ago
13

Two students design an experiment to see if pushing or pulling a box across the floor is more effective. The first student pushe

s the box across the floor a distance of 20 feet and the second student times how long it takes. Next they switch roles and the second student pulls the same box across the floor instead of pushing. They repeat this 5 times. Which statement best describes the design of this experiment? A) This is a well design experiment. B) This experiment is not well design because 20 feet is too long a distance. C) This experiment is not well design because they should not repeat it 5 times. D) This experiment is not well design because they should not switch roles during the experiment.
Chemistry
1 answer:
Alchen [17]3 years ago
8 0

Answer:

The answer is D.

Explanation:

Everything else about the experiment works out great, but in order to have a proper control versus changed, the same person should be pushing and pulling.

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Answer:

6 x 10⁵ kg Hg

Explanation:

The mass of mercury in the entire lake is found by multiplying the concentration of the mercury by the volume of the lake.

The volume of the lake is calculated in cubic feet:

V = (SA)x(depth) = (100mi²)(5280ft/mi)² x (20ft) = 5.57568 x 10¹⁰ ft³

Cubic feet are then converted to mL (1cm³=1mL)

(5.57568 x 10¹⁰ ft³) x (12in/ft)³ x (2.54cm/in)³ = 1.578856752 x 10¹⁵ mL

The mass of mercury is then found:

m = CV = (0.4μg/mL)(1g/10⁶μg)(1kg/1000g) x (1.578856752 x 10¹⁵ mL) = 6 x 10⁵ kg Hg

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3 years ago
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Answer:

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Explanation:

Many tests to distinguish aldehydes and ketones involve the addition of an oxidant. Only <u>aldehydes</u> can be easily oxidized because there is<u> a hydrogen atom</u> next to the carbonyl and oxidation does not require<u> oxygen </u>

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