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3 years ago

O Math

Chemistry

1 answer:

Papessa [141]3 years ago

6 0

Answer:

D). Scientific method.

Explanation:

'Scientific research method' is described as the method of research that 'employs evidence as well as logic to learn about the natural phenomenon and world.' An observation is made at first, then sufficient data is gathered to formulate a theory or hypothesis and its validity is tested and the results are interpreted. The careful observation is logically tested and justified by testing the accuracy through appropriate evidence. It helps in reaching more authentic conclusions and hence, option D is the correct answer.

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Ag2S + Al(s) = Al2S3 + Ag(s) (unbalanced)

Dovator [93]

Answer:

1. 0.97 V

2. $Al_(_s_)/Al^+^3~_(_a_q_)~//~Ag^+~_(_a_q_)/Ag_(_s_)$

Explanation:

In this case, we can start with the half-reactions:

$Ag^+~_(_a_q_)->~Ag_(_s_)$

$Al_(_s_)~->~Al^+^3~_(_a_q_)$

With this in mind we can add the electrons:

$Ag^+~_(_a_q_)+~e^-~->~Ag_(_s_)$ Reduction

$Al_(_s_)~->~Al^+^3~_(_a_q_)+~3e^-~$ Oxidation

The reduction potential values for each half-reaction are:

$Ag_2S~+~e^-~->~Ag_(_s_)~+~S^-^2~_(_a_q_)$ - 0.69 V

$Al^+^3~_(_a_q_)+~2e^-~->~Al_(_s_)$ -1.66 V

In the aluminum half-reaction, we have an oxidation reaction, therefore we have to flip the reduction potential value:

$Al_(_s_)~->~Al^+^3~+~2e^-~$ +1.66 V

Finally, to calculate the overall potential we have to add the two values:

1.66 V - 0.69 V = 0.97 V

For the second question, we have to keep in mind that in the cell notation we put the anode (the oxidation half-reaction) in the left and the cathode (the reduction half-reaction) in the right. Additionally, we have to use "//" for the salt bridge, therefore:

$Al_(_s_)/Al^+^3~_(_a_q_)~//~Ag^+~_(_a_q_)/~Ag_(_s_)$

I hope it helps!

3 0

3 years ago

How many moles of oxygen gas are needed to produce 4 moles of carbon dioxide gas?

11111nata11111 [884]

Answer: 8 moles
Explanation:
Nc2H6= 4 mol
2C2H6 + 7O2 → 4CO2+6H2O
CO2=4/2⋅4
NCO2= 8 moles
( I write this on paper so the letters and format might be confusing) sorry!!

3 0

2 years ago

4 Weathering Assessment

Leni [432]

Answer:

This is an example of a physical change because the ice cubes began to melt.

Explanation:

The above is the right answer to the question about the dissolution of the whole mixture mentioned in the excerpts above.

6 0

3 years ago

Isotopes of elements have different:

Morgarella [4.7K]

Isotopes of elements have same atomic numbers and different mass number(atomic masses).

7 0

3 years ago

What is the common name of this?

drek231 [11]

Answer:

butyl alcohol

Explanation:

8 0

2 years ago