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Elena L [17]
3 years ago
11

A speaker conntected to an MP3 player converts electrical energy into sound energy.according to the law of conversation of energ

y energy is? A)distroyed when operating b)created when operating c) neither created nor distroyed when operating d) created and then distroyed as the system operate

Chemistry
1 answer:
-Dominant- [34]3 years ago
3 0

Answer:

c

Explanation:

The law of conservation clearly states that energy can neither be created nor destroyed

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10. A 2.36-gram sample of NaHCO3 was completely decomposed in an
Airida [17]

Answer:

0.79 g

Explanation:

Let's introduce a strategy needed to solve any similar problem like this:

  • Apply the mass conservation law (assuming that this reaction goes 100 % to completion): the total mass of the reactants should be equal to the total mass of the products.

Based on the mass conservation law, we need to identify the reactants first. Our only reactant is sodium bicarbonate, so the total mass of the reactants is:

m_r=m_{NaHCO_3}=2.36 g

We have two products formed, sodium carbonate and carbonic acid. This implies that the total mass of the products is:

m_p=m_{Na_2CO_3}+m_{H_2CO_3}

Apply the law of mass conservation:

m_r=m_p

Substitute the given variables:

m_{NaHCO_3}=m_{Na_2CO_3}+m_{H_2CO_3}

Rearrange for the mass of carbonic acid:

m_{H_2CO_3}=m_{NaHCO_3}-m_{Na_2CO_3}=2.36 g - 1.57 g=0.79 g

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3 years ago
According to Sam's soap recipe, she needs 855
AURORKA [14]

Answer:

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7 0
3 years ago
The pHof a buffer solution containing 0.10 Macetic acid and 0.10 M
zysi [14]

<span>Chemical reaction: CH</span>₃COO⁻(aq) + H⁺(aq) ⇄ CH₃COOH(aq).

H⁺ is from HNO₃: HNO₃ → H⁺ + NO₃⁻.

<span>A buffer can be defined as a substance that prevents the pH of a solution from changing by either releasing or absorbing H</span>⁺ in a solution.

Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.

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This Venn diagram is being used to compare the classification systems of Aristotle and Whittaker.
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Where is the venn diagram?
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The reason salt crystals, such as kcl, hold together so well is because the cations are strongly attracted to
Lynna [10]
<span>The answer is anions. Cations are positively-charged ions (in this case K+) while anions are negatively-charged ions (in this case Cl-). The ions attract each other  through electrostatic charges and arrange themselves in an ordered fashion to form a lattice</span>




5 0
3 years ago
Read 2 more answers
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