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lawyer [7]
2 years ago
8

Help me out please this is my last attempt on the quiz

Chemistry
2 answers:
Goryan [66]2 years ago
6 0

Answer:

A. We always see the same side of the moon.

Volgvan2 years ago
3 0

Answer:A. We always see the same side of the moon.

Explanation:

The reason we always see the same side of the moon is because the moon rotates and revolves at the same speed.

You might be interested in
Which metal absorbs the greatest amount of heat energy
Fed [463]

Answer:

This question is incomplete but the completed question is in the attachment below. And the correct is b

Explanation:

Specific heat capacity can be defined as the amount of heat required to raise to raise 1 kg of a substance by 1 kelvin. Thus, this means that when the specific heat capacity of a substance is high, it takes more energy to increase the temperature of that substance. This also means that when different substances are subjected to the same amount of heat, the substance with the higher specific heat capacity will absorb less heat; for example at a beach, water has a very high specific heat capacity, thus when the sand in the beach is hot, the beach water is still relatively cold.

From the description above, <u>it can be seen that the metal with the least specific capacity will absorb the greatest amount of heat, thus the metal is lead</u> with the specific heat capacity of 0.129 J/(g. °C).

4 0
2 years ago
An atom of oxygen (atomic number 8) has a mass number of 17. How many neutrons are<br> in that atom?
ludmilkaskok [199]
<h2>Answer:  # of neutrons = 9</h2>

<h3>Explanation:</h3>

# of neutrons = mass number - atomic number

                      = 17 - 8

                      = 9

<h3>∴ number of neutrons in an atom of oxygen of mass number 17, is 9.</h3>
3 0
2 years ago
The total concentration of ions in a 0.75 M solution of HCl is
EastWind [94]
<h3>Answer:</h3>

The total concentration of ions in a 0.75 M solution of HCl is 1.5 M

That is; 0.75 M H⁺ and 0.75 M Cl⁻

<h3>Explanation:</h3>
  • Concentration or molarity is the number of moles of a compound or an ion contained in one liter of solution. It is measured in moles per liter (M).
  • The concentration of ions making a compound is determined by the ratio of moles of the compound and the constituents ions.
  • For instance, HCl dissociates to give H⁺ and Cl⁻

       HCl(aq) → H⁺(aq) + Cl⁻(aq)

  • Therefore, since the mole ratio between HCl and the constituent ions H⁺ and Cl⁻ is 1:1, then 0.75 M of HCl dissociates to give 0.75 M H⁺ and 0.75 m Cl⁻
  • Hence the total concentration of ions in a 0.75 M solution of HCl is 1.5 M (0.75 M H⁺ and 0.75 M Cl⁻)
4 0
3 years ago
Part a use these data to calculate the heat of hydrogenation of buta-1,3-diene to butane. c4h6(g)+2h2(g)→c4h10(g)
Reptile [31]

<u>Answer:</u> The heat of hydrogenation of the reaction is coming out to be 234.2 kJ.

<u>Explanation:</u>

Enthalpy change is defined as the difference in enthalpies of all the product and the reactants each multiplied with their respective number of moles. It is represented as \Delta H

The equation used to calculate enthalpy change is of a reaction is:

\Delta H_{rxn}=\sum [n\times \Delta H_{(product)}]-\sum [n\times \Delta H_{(reactant)}]

For the given chemical reaction:

C_4H_6(g)+2H_2(g)\rightarrow C_4H_{10}(g)

The equation for the enthalpy change of the above reaction is:

\Delta H_{rxn}=[(1\times \Delta H_{(C_4H_{10})})]-[(1\times \Delta H_{(C_4H_6)})+(2\times \Delta H_{(H_2)})]

We are given:

\Delta H_{(C_4H_{10})}=-2877.6kJ/mol\\\Delta H_{(C_4H_6)}=-2540.2kJ/mol\\\Delta H_{(H_2)}=-285.8kJ/mol

Putting values in above equation, we get:

\Delta H_{rxn}=[(1\times (-2877.6))]-[(1\times (-2540.2))+(2\times (-285.8))]\\\\\Delta H_{rxn}=234.2J

Hence, the heat of hydrogenation of the reaction is coming out to be 234.2 kJ.

4 0
3 years ago
Please answer this.A) ____ N2 + ____ H2 → ____ NH3B) ____ KClO3 → ____ KCl + ____ O2C) ____ NaCl + ____ F2 → ____ NaF + ____ Cl2
Lady_Fox [76]

1) Decomposition reactions. In this type of reaction, a compound is broken down into simpler compounds.

AB\rightarrow A+B

Option B is a decomposition reaction

B) ____ KClO3 → ____ KCl + ____ O2

8 0
1 year ago
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