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makkiz [27]
2 years ago
7

Which of the following is an example of physical change

Chemistry
2 answers:
BartSMP [9]2 years ago
8 0
A physical change is like freezing water and it turns into Ice.
jek_recluse [69]2 years ago
4 0

Evaporating rubbing alcohol

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GUYS PLEASE HELP MEEEE!!! On a hike up a mountain Delilah sees small pieces of rock along the trail, the small pieces look like
puteri [66]

Answer:

2?

Explanation:

Well the rocks can be thrown around or just start breaking down. Sorry if I'm not correct

4 0
3 years ago
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If 5.0 moles of C3H8 react, how many molecules of water are formed?
Lady_Fox [76]
 <span>Propane is C3H8 

The balanced equation is: 
C3H8 + 5 O2 --> 3 CO2 + 4 H2O 
From the balanced equation you can see that for each mole of C3H8 you obtain 4 moles of H2O. 

moles H2O = 5.0 moles C3H8(4 moles H2O/1 mole C3H8) = 20 moles H2O formed 

Use Avogadro's number to find the number of molecules. 
molecules H2O = 20 moles H2O(6.02 x 10^23 molecules/1 mole) = 1.20 x 10^25 H2O molecules</span><span>
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4 0
3 years ago
What would be the best flow rate of o2 for a patient with copd?
Step2247 [10]
When we say COPD, this means Chronic Obstructive Pulmonary Disorder. COPD includes a group of lung diseases which have progressed into a worse condition. One example of this is emphysema. In cases of COPD, they should be provided oxygen therapy and the best flow rate for patients with this disorder is <span>8-10 L/min, high-flow, via nasal prong. Hope this helps.</span>
4 0
2 years ago
A 34.57 mL sample of an unknown phosphoric acid solution is titrated with a 0.127 M sodium hydroxide solution. The equivalence p
Bas_tet [7]

<u>Answer:</u> The concentration of unknown phosphoric acid solution is 0.034 M

<u>Explanation:</u>

To calculate the concentration of acid, we use the equation given by neutralization reaction:

n_1M_1V_1=n_2M_2V_2

where,

n_1,M_1\text{ and }V_1 are the n-factor, molarity and volume of acid which is H_3PO_4

n_2,M_2\text{ and }V_2 are the n-factor, molarity and volume of base which is NaOH.

We are given:

n_1=3\\M_1=?M\\V_1=34.57mL\\n_2=1\\M_2=0.127M\\V_2=28.2mL

Putting values in above equation, we get:

3\times M_1\times 34.57=1\times 0.127\times 28.2\\\\M_1=\frac{1\times 0.127\times 28.2}{3\times 34.57}=0.034M

Hence, the concentration of unknown phosphoric acid solution is 0.034 M

7 0
3 years ago
When comparing voltaic cells to electrolytic cells, oxidation occurs at the.
stira [4]

When comparing voltaic and electrolytic cells oxidation occurs at both the anode and the cathode.

<h3>What is an electrolytic cell?</h3>

In an electrolytic cell, the reaction is non-spontaneous so it requires some input of energy for it to function while for a voltaic cell, the reaction is spontaneous.

Oxidation occurs at the anode and reduction occurs at the cathode.

Thus, when comparing voltaic and electrolytic cells oxidation occurs at both the anode and the cathode.

Learn more about electrolytic cells here:

brainly.com/question/4030224

#SPJ1

5 0
2 years ago
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