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2 years ago

For a reaction to occur, energy must be _____ to break chemical bonds.

Chemistry

2 answers:

hichkok12 [17]2 years ago

7 0

Answer: Option (C) is the correct answer.

Explanation:

When energy is absorbed in a chemical reaction then chemical bonds tend to break and cool the surroundings. This type of reaction is known as endothermic reaction.

For example, melting of ice cubes is an endothermic reaction.

Whereas when energy is released in a chemical reaction then it is because atoms come close to each other. This type of reaction is known as exothermic reaction.

Therefore, we can conclude that out of the given options, for a reaction to occur, energy must be absorbed to break chemical bonds.

lapo4ka [179]2 years ago

6 0

Answer: The correct answer is absorbed.

Explanation:

Bond formation is a type of exothermic process. In these reactions when two atoms come close to each other, energy is released in this process.

On the other hand, in the breaking of bond, energy is required because the atoms are to be separated from each other. This is a type of endothermic process. So, the energy must be absorbed.

Hence, the correct answer is absorbed.

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Which of the following is an important intermediate in the mechanism of the reaction<br>in the box?

Dennis_Churaev [7]

Answer:

Explanation:

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2 years ago

What volume of H2O is formed at stp when 6.0g of Al is treated with excess NaOH? NaOH + Al + H2O —-> NaAl(OH)4 + H2 (g)

ioda

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2 years ago

The chief advantage of the metric system over other system of measurement is that it

kolbaska11 [484]

Answer:

The metric system goes by powers of ten, so it's very easy to measure. That would be the main advantage, measurements of ten. We can also say it's the most used measurement around the world, so all scientists have little to no conversion, but the main answer is probably the first one :)

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2 years ago

Determine whether each of the following statements about sulfur oxide and/or nitrogen oxide pollution is true or false.

astraxan [27]

Answer:

a) False

b) False

c) True

Explanation:

a) Most sulfur oxides formed during combustion come from sulfur in the air: The sulfur burns in presence of oxygen to produce sulfur oxides, the source of sulfur is anthropogenic activities (Human activities).

So the given statement is false.

b) A flue gas scrubber removes SO2 pollution in a coal-fired power plant by using lime to convert the SO2 into alcohols:

False

The lime reacts with sulfur dioxide to give carbon dioxide and calcium sulfite.

$CaCO_{3}+SO_{2}--->CaSO_{3}+CO_{2}$

c) True

3 0

2 years ago

A sample of seawater contains 1.3g of calcium ions in 3,100kg of solution. what is the calcium ion concentration of this solutio

MakcuM [25]

Unit ppm stands for parts per million. in terms of mass, ppm is equivalent to mg/kg.
since 1 kg is 10⁻⁶ mg, 1 kg is equivalent to million mg.
therefore mg/kg is also ppm.
there are 1.3 g of Ca ions in 3100 kg
if 3100 kg contains - 1.3 g of Ca
then 1 kg contains - 1.3 g / 3100 kg
then Ca ions - 0.42 x 10⁻³ g/kg
Ca ion concentration - 0.42 mg/kg
therefore Ca ion concentration is 0.42 ppm

8 0

3 years ago