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seropon [69]
3 years ago
15

Chalk is an ionic compound. Which is a property of all ionic compounds that makes chalk particularly useful for writing on a cha

lkboard? A a high melting point B hardness and brittleness C inability to dissolve in water D a multicolored appearance
Mathematics
2 answers:
Delicious77 [7]3 years ago
6 0

The correct answer is B. Hardness and brittleness

Explanation:

The ions in materials such as chalk and other ionic compounds are bonded by electrostatic forces. These features give ionic compound unique characteristics. This includes the fact these materials are usually hard, which means they do not deform easily and the fact these are brittle, which means they break easily.

These properties can be observed in chalk because the chalk itself keeps its shape or does not deform (hardness) but it breaks easily under pressure (brittleness), indeed due to this last property it is possible to write using chalk and due to the first property it is possible the chalk is a durable material.

nalin [4]3 years ago
5 0

Answer:

It’s B

Step-by-step explanation:

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Answer:

It would take the newer pump 4.5 hours to drain the pool

Step-by-step explanation:

Let's investigate first what is the fraction of the job done in the unit of time (hour in this case) by each pump if the work individually:

older pump: if it takes it 9 hours to complete the job, it does \frac{1}{9} of the job in one hour.

newer pump: we don't know how long it takes (this is our unknown) so we call it "x hours". Therefore, in the unit of time (in one hour) it would have completed \frac{1}{x} of the total job.

both pumps together: since it takes both 3 hours to complete the job, in one hour they do \frac{1}{3} of the job.

Now, we can write the following equation about fractions of the job done:

<em>The fraction of the job done by the older pump plus the fraction of the job done by the newer pump in one hour should total the fraction of the job done when they work together.</em> That is in mathematical terms:

\frac{1}{9} +\frac{1}{x} =\frac{1}{3}

and solving for x:

\frac{1}{9} +\frac{1}{x} =\frac{1}{3} \\x+9=3x\\2x=9\\x=\frac{9}{2} \,\,hours\\x = 4.5\,\,hours

4 0
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Answer:

D

Step-by-step explanation:

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3 0
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The answer would be $184,274.23.

Step-by-step explanation:

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3 years ago
A linear function has an x-intercept of 12 and a slope of 3/8. How does this function compare to the linear function that is rep
aivan3 [116]
We rewrite the statement correctly:
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 m = ((- 3 + 6) / 8) / (1)
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It has the same slope and a different y-intercept
4 0
3 years ago
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