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kvasek [131]
3 years ago
7

____ help scientists understand processes in the natural world by providing simpler representations of those processes.

Chemistry
1 answer:
Marina CMI [18]3 years ago
7 0

Answer:

Models help scientists understand processes in the natural world by providing simpler representations of those processes.

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How many Valence electrons does Li have?
deff fn [24]

It has a single valence electron.

3pro & 3ele - it is the single electron in shell 2.

6 0
3 years ago
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For 100.0 mL of a solution that is 0.040M CH3COOH and 0.010 M CH3COO, what would be the pH after adding 10.0 mL 50.0 mM HCl?
damaskus [11]

Answer:

The pH of the buffer is 3.90

Explanation:

The mixture of a weak acid CH3COOH and its conjugate base CH3COO produce a buffer that follows the equation:

pH = pKa + log [A-] / [HA]

<em>Where pH is the pH of the buffer, pKa is the pKa of acetic acid (4.75), and [A-] could be taken as the moles of the conjugate base and [HA] the moles of thw weak acid.</em>

<em />

To solve this question we need to find the moles of the CH3COOH and CH3COO- after the reaction with HCl:

CH3COO- + HCl → CH3COOH + Cl-

<em>The moles of CH3COO- are its initial moles - the moles of HCl added</em>

<em>And moles of CH3COOH are its initial moles + moles HCl added</em>

<em />

Moles CH3COO-:

Initial moles  = 0.100L * (0.010mol / L) = 0.00100moles

Moles HCl = 0.010L * (0.050mol / L) = 0.000500 moles

Moles CH3COO- = 0.000500 moles

Moles CH3COOH:

Initial moles  = 0.100L * (0.040mol / L) = 0.00400moles

Moles HCl = 0.010L * (0.050mol / L) = 0.000500 moles

Moles CH3COO- = 0.003500 moles

pH is:

pH = 4.75 + log [0.000500] / [0.00350]

<em>pH = 3.90</em>

<em />

<h3>The pH of the buffer is 3.90</h3>
3 0
3 years ago
a. Compare the motion of the particles as a solid, liquid, and gas. b. What happens to the intermolecular bonds during phase cha
natta225 [31]
The answer A I’m positively absolutely
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Distinguish between ethane ethyne and ethene<br>​
umka21 [38]

Answer:

ethane=c2h6

ethyne=c2h2

ethene=c2h6

Explanation:

ethane has single bond between carbon atoms(it is alkane.) ethyne has triple bond between carbon atoms(it is alkyne) ethene has double bond between carbon atoms (it is alkene)

7 0
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An experiment was conducted to see which metal pot would be better for cooking food quickly. The table below shows how quickly s
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Answer:

Conclusion.....hope this helps

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