An ELEMENT is a substance that cannot be broken down into other substances by ordinary chemical procedures. Some easy examples would be: <span>gold, iron, carbon, </span>hydrogen<span>, </span>oxygen<span>, nitrogen.</span>
The statement that best describes the graph of the relationship between the volume and temperature is; "It is a straight line with a positive slope showing that an increase in temperature results in an increase in volume."
The graph of volume against temperature is used to demonstrate Charles law. This law states that, the volume of a given mass of gas is directly proportional to its absolute temperature at constant pressure.
According to this law, the volume increases as temperature increases. This is the meaning of the positive slope of the straight line graph.
Hence, the statement that best describes the graph of the relationship between the volume and temperature of an enclosed gas is "It is a straight line with a positive slope showing that an increase in temperature results in an increase in volume."
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Answer:
Explanation:
It is possible to answer this question knowing Hess's law that says you can sum half-reactions enthalpy cahnge to obtain enthalpy change of the total reaction. Using the reactions:
<em>(1) </em>2NO(g) → N₂(g)+O₂(g) ΔH = -180,6 kJ
<em>(2) </em>N₂(g) + O₂(g) + Cl₂(g) → 2NOCl(g) ΔH = +103,4 kJ
The reverse reactions of (1) and (2) are:
<u>N₂(g)+O₂(g)</u> → 2NO(g) ΔH = +180,6 kJ
2NOCl(g) → <u>N₂(g) + O₂(g)</u> + Cl₂(g) ΔH = -103,4 kJ
The sum of these reactions is:
2NOCl(g) → 2NO(g) + Cl₂(g) ΔH = +180,6 kJ -103,4 kJ = <em>77,2 kJ</em>
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In the reaction represented by the equation 2Al2O3-->4Al+3O2, what is the mole ratio of aluminum to oxygen?
4:3