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kap26 [50]
3 years ago
15

Using wolfram alpha or some other reference, determine which of these elements would be liquid at 525 k (assume samples are prot

ected from air):
Chemistry
1 answer:
romanna [79]3 years ago
3 0
The choices for this problem are bismuth, Bi; platinum, Pt; selenium, Se; calcium, Ca and copper, Cu. I think the correct answer would be selenium. The melting point of bismuth is at a temperature of 544.4 Kelvin. At a temperature of 525 K, it would exist as solid. Platinum melts at 2041.1 K. At 525 K, platinum would be in solid form. Selenium has a melting point at 494 K so that at a temperature of 525 K, it would exist in its liquid state. Calcium has a melting point of 1112 K so it would exist as solid at 525 K. Copper has a melting point at 1358 K, so it would still exist as solid at a temperature of 525 K. Therefore, the answer would only be selenium.
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prisoha [69]
2 half lives are required.
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Which of the following statements about the combustion of glucose with oxygen to form water and carbon dioxide (C6H12O6 + 6 O2 →
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Answer:

The correct statement is:

E - The entropy of the products is greater than the entropy of the reactants.

Explanation:

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Initial state: 7 molecules (1 glucose + 6 oxygen)

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3 0
3 years ago
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If a mass of a cube were 48.0g and its volume 24.0 cm3 what would its density be
EastWind [94]

Answer:

<h3>The answer is 2 g/cm³</h3>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume}  \\

From the question

mass = 48 g

volume = 24 cm³

We have

density =  \frac{48}{24}  \\

We have the final answer as

<h3>2 g/cm³</h3>

Hope this helps you

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What is the [OH-] in a solution if the [H*] = 1.2 x 10-3 M?
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plugging the value of [H⁺]

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[OH⁻] = 833.3 * 10⁻¹⁴

[OH⁻] = 8.33 * 10⁻¹²

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