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Snowcat [4.5K]
3 years ago
14

As human populations grow, it becomes more important to use renewable sources of energy. Which of the following objects uses ene

rgy from a renewable source?
A-a stove that is powered by natural gas

B- a refrigerator that runs on solar power

C- a lantern that burns oil from beneath Earth's surface

D- a toaster that uses electricity from a coal-burning power plant
Chemistry
1 answer:
AleksandrR [38]3 years ago
4 0
B

explanation:
it’s common sense
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Why do the two electrons spend their time equally between both hydrogen atoms? In other words, why can’t one hydrogen just take
vekshin1
Because it is a covalent bond meaning that they share the electrons to achieve full valence.
6 0
3 years ago
139%
GaryK [48]

<u>Answer:</u>

The percent composition of this compound is 94%

<u>Explanation:</u>

The reaction can be formed as

2 \mathrm{Fe}+3 \mathrm{Cl}_{2} \rightarrow 2 \mathrm{FeCl}_{3}

\frac{\text { Weight of } \mathrm{Cl}_{2}}{\text { 3* Molar Mass of } \mathrm{Cl}_{2}}=\frac{\text { Weight of } \mathrm{Fe}}{2 * \text { Molar Mass of Fe }}

\frac{\text { Weight of } \mathrm{Cl}_{2}}{3 *(2 * 35.5)}=\frac{3.56}{2 * 55.8}

\text { Weight of } C l_{2}=\frac{3.56 * 3 * 71}{2 * 55.8}=6.79 \mathrm{g}

\mathrm{n}\left(\mathrm{Cl}_{2}\right)=\mathrm{m}\left(\mathrm{Cl}_{2}\right) / \mathrm{M}\left(\mathrm{Cl}_{2}\right)=6.79 / 71=0.1 \mathrm{m}

\mathrm{n}(\mathrm{Fe})=\mathrm{m}(\mathrm{Fe}) / \mathrm{M}(\mathrm{Fe})=3.56 / 55.8=0.06 \mathrm{m}

Based on no. of iron reacted,  

\mathrm{n}(\text { moles of } \mathrm{Fe})=\mathrm{n}\left(\text { moles of } \mathrm{FeCl}_{3}\right)

n = m/M

\mathrm{m}\left(\mathrm{FeCl}_{3}\right)=\mathrm{n}^{*} \mathrm{M}=0.06^{*} 162.5=9.75 \mathrm{g}

% composition ofFeCl_3  

=  (9.75 / 10.39)^{*} 100

= 94%

6 0
3 years ago
Which of the following choices would have a positive entropy change?
aalyn [17]

Answer:

  • The option <u><em>B) Fe₂O₃ (s) + 3C(s) → 2Fe(s) + 3CO₂(g),</em></u> because the reactants are only solid units and the products contain gas molecules.

Explanation:

A <em>positive entropy change</em> means that the entropy of the products is greater than the entropy of the reactants.

Entropy in a measure of the radomness or disorder of the system.

Let's see every reaction:

<u />

<u>A) 4NO₂ (g) + 2 H₂O (l) + O₂ (g) → 4 HNO₃ (aq)</u>

Since 5 molecules of a gas (high disorder) combines with 2 molecules of liquid to produce 4 units of aqueous HNO₃ you may expect that the product is more ordered than the reactants, which means that the change in entropy is negative (the entropy decreases).

<u />

<u>B) Fe₂O₃ (s) + 3C(s) → 2Fe(s) + 3CO₂(g)</u>

The left side (reactants) show only solid substances which is a highly ordered arrangement while the right side (products) show the formation a solid (ordered arrangement) and a gas (highly disoredered arrangement), so you can predict the increase of the system entropy, i.e. a positive entropy change.

The <u>equation C)</u> shows the combination of 12 gas molecules to produce 1 solid and 6 gas molecules, so you can expect that the entropy will decrease, i.e. a negative entropy change.

For <u>equation D)</u> the products include solid and gas reactants while the product is just one unit of solid substance, letting you to predict a negative entropy change.

4 0
3 years ago
When a chemical reaction occurs, what always stays the same between reactants and products?
BlackZzzverrR [31]
The total number of atoms remains unchanged, <em>always.</em> But the chemical properties change :)

please rate brainliest! thanks!
7 0
3 years ago
An element A forms a compound AH3 with hydrogen. Another element B forms a compound BA2 with B. Given that the valency of hydrog
Hatshy [7]

Answer:

A - 3

B - 6

Explanation:

The valency of hydrogen atom is +1

The valancy of an atom of other element combining with the hydrogen atom can be determined from the  number of associated hydrogen.

when H combines with A, three atoms of hydrogen are used. Thus the valency of element A is -3

Now B combines with two molecules of A whose valency is -3

The valency of B would be twice the valency of element A i.e 6

if hydrogen combines with B, then the compound formed will be BH6

8 0
4 years ago
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