Answer: The pressure of a gas will increase when there is a decrease in the volume of the gas.
Explanation: according to Boyle's law, the volume of a gas will decrease when the pressure is increased at constant temperature and vice versa.
Being as hydrogen is the lightest element it works most efficiently as lift in our atmosphere which is mostly made of heavier nitrogen.
Answer:
sedimentary rock
Explanation:
Because there are three stages, first igneous rock changes into either sedimentary rock or meatamorphic rock.
Answer: the enthalpy of reaction is, -155 kJ
Explanation:-
According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.
According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.
The final reaction is:
![\Delta H_{rxn}=?](https://tex.z-dn.net/?f=%5CDelta%20H_%7Brxn%7D%3D%3F)
The intermediate balanced chemical reaction will be,
(1)
![\Delta H_1=-284kJ](https://tex.z-dn.net/?f=%5CDelta%20H_1%3D-284kJ)
(2)
![\Delta H_2=-527kJ](https://tex.z-dn.net/?f=%5CDelta%20H_2%3D-527kJ)
(3)
![\Delta H_3=44.0kJ](https://tex.z-dn.net/?f=%5CDelta%20H_3%3D44.0kJ)
Now multiplying (3) by 2 and adding all the equations, we get :
![\Delta H_{rxn}=\Delta H_1+\Delta H_2+2\times \Delta H_3](https://tex.z-dn.net/?f=%5CDelta%20H_%7Brxn%7D%3D%5CDelta%20H_1%2B%5CDelta%20H_2%2B2%5Ctimes%20%5CDelta%20H_3)
![\Delta H_{rxn}=(-284)+(-527)+2\times (44)](https://tex.z-dn.net/?f=%5CDelta%20H_%7Brxn%7D%3D%28-284%29%2B%28-527%29%2B2%5Ctimes%20%2844%29)
![\Delta H_{rxn}=-155kJ](https://tex.z-dn.net/?f=%5CDelta%20H_%7Brxn%7D%3D-155kJ)
Therefore, the enthalpy of reaction is, -155 kJ
Answer:
Fe₂O₃
Explanation:
When Fe is burned it can form iron (II) oxide or iron (III) oxide. The reactions are:
a) Fe + 1/2 O₂ → FeO
b) 4 Fe + 3 O₂ → 2 Fe₂O₃
In the reaction "a", the mass ratio of FeO to Fe is 71.84 g FeO:55.85 g Fe =
1.29 g FeO: 1 g Fe
In the reaction "b", the mass ratio of Fe₂O₃ to Fe is 319.3 g Fe₂O₃: 223.4g Fe =
1.43 g Fe₂O₃ : 1 g Fe
According to the experimental data, the mass ratio of the product to Fe is 165.5g compound: 115.0 g Fe =
1.43 g compound: 1 g Fe
Since this ratio is equal to that of reaction "b", the empirical formula of the solid is Fe₂O₃.