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Andrews [41]
3 years ago
10

The task in science lab: discover which solid substance, without tasting, is sugar. Donna and Dave have five substances to test,

and unfortunately, two are white! "Let's heat them!" suggested Donna. Did Donna have a reasonable solution to their problem?
A) Yes, it would help narrow the search to salt or sugar.
B) No, all four substances have pretty low melting points.
C) No, it's impossible to reach these temperatures in a student lab.
D) Yes, sugar's melting point is much lower than the other four solids.
Chemistry
2 answers:
VARVARA [1.3K]3 years ago
8 0

Yes, sugar's melting point is much lower than the other four solids. They were probably able to rule out ice immediately because it would melt at room temperature. That leaves the other solids. They could identify sugar and salt by color and then heat both, seeing which one melts first. That would be sugar.

Alecsey [184]3 years ago
5 0

D. Yes, sugar's melting point is much lower...

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A geological sample is found to have a Pb-206/U-238 mass ratio of 0.337/1.00. Assuming there was no Pb-206 present when the samp
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2.1x10⁹ years

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U-238 is a radioactive substance, which decays in radioactive particles. It means that this substance will lose mass, and will form another compound, the Pb-206.

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The mass of Pb-206 will be the mass that was lost by U-238, so it will be mi - m. Thus, the mass ration can be expressed as:

(mi-m)/m = 0.337/1

mi - m = 0.337m

mi = 1.337m

Substituing mi in the expression of half-life:

m = 1.337m/2ⁿ

2ⁿ = 1.337m/m

2ⁿ = 1.337

ln(2ⁿ) = ln(1.337)

n*ln(2) = ln(1.337)

n = ln(1.337)/ln2

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which of these pieces of equipment would be the most appropriate for precisely measuring 29 mL of liquid? Explain your reasoning
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Answer:

The best equipment would be the graduated cylinder. Why?

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Without even going into the details, we can first rule out the volumetric flask, since its smallest marking is 100 mL and even that is already bigger than our sample size, hence we would have no markings to accurately measure out 29 mL of our sample had we used the volumetric flask.

Next to be ruled out would be the Erlenmeyer flask, as you can see in the image, it only has three marking, and as the smallest marking is 25 mL, each marking is at least 25 mL, and even so far as going up to 50 mL. This cannot let us accurately measure 29 mL out at all, due to the markings being way too big to do that. Hence, the Erlenmeyer flask is ruled out.

Finally, the beaker seems to be a worthy candidate! Unfortunately, for the same reason as the Erlenmeyer flask, as you can see in the image each marking represents 10 mL. We cannot measure 9 mL in the beaker accurately, and hence the beaker is ruled too.

We are left with the graduated cylinder, and that is our answer.

Explanation:

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