3 years ago

Describe how you could feel weightless on earth

Chemistry

1 answer:

Zina [86]3 years ago

7 0

Answer:

gravity is the explination

Explanation:

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DNA testing which I think is the largest breakthrough.

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What are acids? List few substances containing acid.

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An acid is any substance that in water solution tastes sour, changes blue litmus paper to red, reacts with some metals to liberate hydrogen, reacts with bases to form salts, and promotes chemical reactions.
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2 years ago

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Can someone help me? It needs to have a diagram that has arrows.

daser333 [38]

Answer: The enthalpy change for formation of butane is -125 kJ/mol

Explanation:

The balanced chemical reaction is,

$C_4H_{10}(g)+\frac{13}{2}O_2(g)\rightarrow 4CO_2(g)+5H_2O(l)$

The expression for enthalpy change is,

$\Delta H=[n\times H_f{products}]-[n\times H_f{reactants}]$

Putting the values we get :

$\Delta H=[4\times H_f_{CO_2}+5\times H_f_{H_2O}]-[1\times H_f_{C_4H_{10}}+\frac{13}{2}\times H_f_{O_2}]$

$-2877=[(4\times -393)+(5\times -286)]-[1\times H_f_{C_4H_{10}}+\frac{13}{2}\times 0]$

$H_f_{C_4H_{10}=-125kJ/mol$

Thus enthalpy change for formation of butane is -125 kJ/mol

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3 years ago

What is the number at the end of an isotope’s name?

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Explanation:

5 I don't know what is the answer if I got it wrong

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I need help for school lol

monitta

Answer:

sugar

Explanation:

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