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3 years ago

Is MgBr2 a covalent bond or an ionic bond

1 answer:

3 0

It is an Ionic bond. Ionic bonds can be remembered as between a metal and nonmetal, while covalents are mostly nonmentals and nonmentals.

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Effect of azeotrope system

Naddik [55]

Answer:

Explanation:

The effect of azeotrope system is that , a positive azeotrope system boils at lower temperature than the other liquid constituents. It is also refer to as minimum temperature.

A negative azeotrope system boils at high temperature than other liquid constituents.

A azeotrope mixure refer to mixture of liquid with constant boiling point.

7 0

3 years ago

How does thermal energy affect the three states of matter??

Ivenika [448]

An increase in thermal energy, changes the state of matter from solid to liquid to gas.

8 0

4 years ago

How many significant figures are in 7.1 x 10-6

Iteru [2.4K]

7.1x10=71

71-6=65

2cifrass

3 0

4 years ago

A buffer solution contains 0.240 M ammonium chloride and 0.499 M ammonia. If 0.0565 moles of perchloric acid are added to 250 mL

snow_lady [41]

Answer:

The pH of the resulting solution is 9.02.

Explanation:

The initial pH of the buffer solution can be found using the Henderson-Hasselbalch equation:

$pOH = pKb + log(\frac{[NH_{4}Cl]}{[NH_{3}]})$

$pOH = -log(1.78\cdot 10^{-5}) + log(\frac{0.240}{0.499}) = 4.43$

$pH = 14 - pOH = 14 - 4.43 = 9.57$

Now, the perchloric acid added will react with ammonia:

$n_{NH_{3}} = 0.499moles/L*0.250 L - 0.0565 moles = 0.0683 moles$

Also, the moles of ammonium chloride will increase in the same quantity according to the following reaction:

NH₃ + H₃O⁺ ⇄ NH₄⁺ + H₂O

$n_{NH_{4}Cl} = 0.240 moles/L*0.250L + 0.0565 moles = 0.1165 moles$

Finally, we can calculate the pH of the resulting solution:

$pOH = pKb + log(\frac{[NH_{4}Cl]}{[NH_{3}]})$

$pOH = -log(1.78\cdot 10^{-5}) + log(\frac{0.1165 moles/0.250 L}{0.0683 moles/0.250 L}) = 4.98$

$pH = 14 - 4.98 = 9.02$

Therefore, the pH of the resulting solution is 9.02.

I hope it helps you!

5 0

3 years ago

The temperature of 100. g of water at 25.0C increases to 31.9C. How much energy was added to the water? The specific heat of wat

Yakvenalex [24]

Answer:

2890j

Explanation:

5 0

3 years ago