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3 years ago

Choose the letter that best describes the behavior of a substance during a phase change:

Chemistry

1 answer:

velikii [3]3 years ago

3 0

Answer:

/D/ either absorbs or releases energy

Explanation:

During a phase change energy is either absorbed or released.

A phase change is a reversible process which occurs when a substance changes is its state from one form to another.

Phase changes are used to delineate physical changes.

A phase diagram provides a graphic representation of the change.
The diagram can be 2 dimensional or 3 dimensional.

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What is the % yield when 12g of Mg react with HCl to produce 0.2g of H2?

goblinko [34]

Answer:

The yield is 20 %.

Explanation:

Mg + 2 HCl → MgCl2 + H2

(12 g Mg) / (24.30506 g Mg/mol) x (1 mol H2 / 1 mol Mg) x (2.015894 g H2/mol) = 0.9953 g H2.

(0.2 g) / (0.9953 g) = 0.20 = 20% yield

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3 years ago

Calcium and bromine have formed a bond. Leading up to this, calcium gave up electrons. It was a(n) ____.

Ugo [173]

<u><em>Answer:</em></u>

It was a positive ion.

<u><em>Explanation</em></u>

In CaBr, ionic bond is present. When one of the atom loses electrons and gets positive charges and other atom gains electrons and become negative. As a result of positive and nagative charges , a ionic bond formed.

As in this case, Ca loses electrons and become positive ion while on the other hand bromide gets the electrons and become negative ion.

Electropositive atoms always loose electrons Like Ca while electronegative atoms always gain elelctrons like Br.

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4 years ago

Read 2 more answers

How many unpaired electrons does neon have

lidiya [134]

P has three unpaired electrons

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3 years ago

1. which volume has the most uncertainty associated wit the measurement?

Mamont248 [21]

1. The option a. 10 mL has the most uncertainty associated with it, because it has only 2 significative figures, while 10.0 mL has three significant figures and 10.00 has four significant figures.

2. The volume of solution that remains is 145.675 mL - 24.2 mL = 121.475 mL rounded to one decimal = 121.5 mL, given that the measure with the most uncerntainty has only one decimal.

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4 years ago

g Consider the following system at equilibrium where H° = -87.9 kJ, and Kc = 83.3 , at 500 K: PCl3 (g) + Cl2 (g) PCl5 (g) If the

Ksivusya [100]

Answer:

C. Remains the same

A. Is greater than Kc

B. Run in the reverse direction to restablish equilibrium.

C. Remain the same

Explanation:

As the reaction is exothermic (ΔH < 0), when occurs, produce heat.

Based on Le Chatelier's principle, if the temperature decreases, <em>the system will produce more product trying to restore the equilibrium</em>

* The value of Kc doesn't change because is the constant of the reaction, Kc. That is,

<h3>C. Remains the same</h3>

* Qc is the ratio between products and reactants. As more product is produced, Qc will increase becomes:

<h3>A. Is greater than Kc</h3>

*After the formation of product, the system must:

<h3>B. Run in the reverse direction to restablish equilibrium. </h3>

Because product is produced

*Cl₂ as reactant is consumed producing more product, decreasing its concentration. But when the equilibrium is restored, its concentration would be the same

<h3>C. Remain the same</h3>

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3 years ago