Chemistry: Any chemical or physical change that absorbs energy 1. cannot occur spontaneously. 2. forms products with less mass than the initial reactants. 3. is an endothermic process. 4. has high activation energy.

Any chemical or physical change that absorbs energy

Ответ:

nabeelunique

17.03.2022

Chemistry

3. is an endothermic process.

Explanation:

Generally, reactions can be classified into two. Depending on whether they absorb heat -energy or release energy.

Endothermic Reactions are those reactions in which the reaction absorb heat form the surroundings.

Exothermic reactions are those reactions that release heat to the surroundings.

This means the correct option is;

3. is an endothermic process.

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Ответ:

tmax267

18.02.2020

Chemistry

About 547 grams.

Explanation:

We want to determine the mass of copper (II) bicarbonate produced when a reaction produces 2.95 moles of copper (II) bicarbonate.

To do so, we can use the initial value and convert it to grams using the molar mass.

Find the molar mass of copper (II) bicarbonate by summing the molar mass of each individual atom:

$\displaystyle \begin{aligned} \text{MM}_\text{Cu(HCO$_3$)$_2$} &= (63.55 + 2(1.01)+2(12.01)+6(16.00))\text{ g/mol} \\ \\ &=185.59\text{ g/mol} \end{aligned}$

Dimensional Analysis:

$\displaystyle 2.95\text{ mol Cu(HCO$_3$)$_2$}\cdot \frac{185.59 \text{ g Cu(HCO$_3$)$_2$}}{1 \text{ mol Cu(HCO$_3$)$_2$}} \Rightarrow 547 \text{ g Cu(HCO$_3$)$_2$ }$

In conclusion, about 547 grams of copper (II) bicarbonate is produced.

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Any chemical or physical change that absorbs energy 1. cannot occur spontaneously. 2. forms products with less mass than the initial reactants. 3. is an endothermic process. 4. has high activation energy.

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