<u>We are given:</u>
Initial Temperature = 90°c
Final Temperature = 120°c
Heat applied(ΔH) = 500 Joules
Specific heat(c) = 0.9 Joules / g°C
Mass of Aluminium(m) = ?
<u>Change in temperature:</u>
ΔT = Final temp. - Inital Temp.
ΔT = 120 - 90
ΔT = 30°c
<u>Calculating the mass:</u>
We know the formula:
ΔH = mcΔT
replacing the values:
500 = m(0.9)(30)
500 = m(27)
m = 500/27
m = 18.52 grams
<h3>Answer : </h3>
<h3>→ TRUE </h3>
Explanation:
<h3>Air masses are large volumes of air that</h3><h3> have generally the same temperature and</h3><h3> pressure.</h3>
Answer : Normally in any chemical reaction, if the enthalpy change i.e. ΔH is positive which means it is greater than zero then it can be called as an Endothermic Reaction.
Whereas, the system under study is absorbing heat that is produced during the reaction. So if ΔH is found to be positive then it can be called as endothermic reaction.
A(n) strong acid or base will dissociate completely in water, whereas a(n) weak acid or base dissociates very little in water.
Strong acids are defined as any acid that completely dissociates into ions. It is a weak acid if dissociation is less than 100%.
Strong bases are defined as any acid that completely dissociates into ions. It is a weak base if dissociation is less than 100%.
Not every acid or base ionizes or dissociates to the same degree. This supports the claim that not all acids and bases have the same ability to produce H+ and OH- ions in solution.
The adjectives "strong" and "weak" describe how strong an acid or base is. The ability of acidic and basic solutions to conduct electricity is referred to as strong and weak.
Strong electrical conductivity indicates that an acid or base is a strong acid or base. A weak acid or base is one that conducts electricity only slightly.
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