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sertanlavr [38]
3 years ago
10

A scientist compares two samples of white powder. One powder was present at the beginning of an experiment. The other powder was

present at the end. She wants to determine whether a chemical reaction has occurred. She finds that neither sample bubbles or dissolves in water. She measures the mass and volume of the solids. Sample one has a volume of 45 cm3 and a mass of 0.5 g. Sample two has a volume of 65 cm3 and a mass of 1.3 g. What should the scientist conclude?
A)The samples have the same color, so no chemical reaction has occurred.
B)The two samples do not react with water, so no chemical reaction has occurred.
C)The densities of the samples are different, so a chemical reaction has occurred.
D)The densities of the samples are the same, so no chemical reaction has occurred.
E)The densities of the samples are different, so no chemical reaction has occurred.
Physics
1 answer:
Jet001 [13]3 years ago
4 0
Density of powder 1 = 0.5 g / 45 cm^3 = 1/90 g/cm^3
Density of powder 2 = 1.3 g / 65 cm^3 = 1/50 g/cm^3

Therefore the densities of the two powders are different, hence chemical reaction has occurred.

(note: none of the other choices make sense.  In fact, a different density does not necessarily indicate a chemical change, see paragraph below).

Density of powders are not definitive unless they are each of the same size and texture.  For example, granular sugar, rock sugar, and icing sugar all have different densities.  I would conclude that this experiment does not lend to a reliable answer.
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7 0
3 years ago
An aluminum cylinder weighing 30 N, 6 cm in diameter and 40 cm long, is falling concentrically through a long vertical sleeve of
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= (0.0604/2 - 0.06/2)m

= 2×10^-4

Surface are of the cylinder in the drop, which is required in order to evaluate the shearing stress can be expressed as A(cylinder) = π.d.L

= (π×0.06×0.4)m²

= 0.075m²

Since the force of the cylinder's weight is going to balance the shearing force on the walls, we can express the next equation and derive terminal velocity from it.

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4 0
3 years ago
Please don’t troll. I need someone to actually answer these questions.
mash [69]

Answer:

-3+3 i think this is the answer

Explanation:

i think you can ask someone else sorry

4 0
3 years ago
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