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Alisiya [41]
3 years ago
14

Which of the following belong to a category called the main group of elements

Chemistry
2 answers:
Lina20 [59]3 years ago
4 0
C I hope it helps rkjnjjrnbejjje
Anna71 [15]3 years ago
3 0

Answer:

C. Alkaline Metal ok thanks

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4.2 L of a gas has a pressure of 560mmHg at 72⁰F. What is the temperature at760mmHg if the volume is still 4.2 L? (5 pts)
IgorLugansk [536]

Answer:

The temperature at 760mmHg if the volume is still 4.2 L is 400.862 K

Explanation:

Gay Lussac's law indicates that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases. This law can be expressed mathematically as follows:

\frac{P}{T} =k

Having an initial state 1 and a final state 2, the following is true:

\frac{P1}{T1} =\frac{P2}{T2}

In this case:

  • P1= 560 mmHg
  • T1= 72 F= 295.372 K (being 32 F= 273.15 K)
  • P2= 760 mmHg
  • T2= ?

Replacing:

\frac{560 mmHg}{295.372 K} =\frac{760 mmHg}{T2}

Solving:

T2= 760 mmHg*\frac{295.372 K}{560 mmHg}

T2= 400.862 K

8 0
3 years ago
Balanced chemical equation for the use of hydrogen fuel
Ganezh [65]
I'm not sure but I think is 2H2<span> => 4H</span>+ + 4e- and O2<span> + 4H</span>+<span> + 4e</span>-<span> => 2H</span>2<span>O</span>
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4 years ago
How many elements are in C8H3NaBr12?
dimaraw [331]

Answer:

I don’t get it you have to go more into detail lol then I’ll answer

Explanation:

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3 years ago
ΔH is always positive for a ...........
scoray [572]

Answer:

a. endothermic reaction

Explanation:

In an endothermic reaction, heat is absorbed from the environment. This leaves the surrounding at a colder temperature compared to the system.

ΔH, the change in enthalpy is assigned a positive sign because the heat energy level of the final state is higher than that of the initial state.

Some examples are mostly dissolution substances in water.

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Describe the relationship between hydrogen oxygen and water
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Hydrogen is composed of H atom and oxygen is composed of O atom. For water, it is composed by both H and O atom. If you burn hydrogen in oxygen, you can get water. And if you electrolysis water, you can get hydrogen and oxygen.
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4 years ago
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