Just choose one of them. Getting one question wrong isn't the end of the world.
I suggest water.
Answer:
Specific Heat Capacity = 0.901 J.g⁻¹.°C⁻¹
Heat is Exothermic
Explanation:
Specific heat capacity is the amount of heat required to raise the temperature of a given amount of substance by one degree.
Also, Exothermic reactions are those reaction in which the heat is lost from the system to surrounding while, endothermic reactions are those in which the system gains heat from the surroundings.
The equation used for this problem is as follow,
Q = m Cp ΔT ----- (1)
Where;
Q = Heat = 14200 J
m = mass = 350 g
Cp = Specific Heat Capacity = ??
ΔT = Change in Temperature = 70 °C - 25 °C = 45 °C
Solving eq. 1 for Cp,
Cp = Q / m ΔT
Putting values,
Cp = 14200 J / (350 g × 45 °C)
Cp = 0.901 J.g⁻¹.°C⁻¹
As the heat is lost by the metal therefore, the heat is exothermic.
Answer:
4.7485 g
Explanation:
4.50 x 10^22 Cu atoms * (1 mol Cu / 6.022 x 10^23 Cu atoms) * 63.546 g Cu/(mol Cu) = 4.7485 g
In every mole of Cu, there are 6.022 x 10^23 atoms (Avogadro's number). The molecular weight of copper is 63.546 g/mol.
The ph value of water is 7 but a salt which is derived from a weak acid will be less than 7 and a salt which is derived from a base will be above 7.
The arrow that will represent the phase change that involves the same amount of energy as arrow 1 will be arrow 4.
<h3>Phase change</h3>
Arrow 1 represents a phase change from liquid to gas while arrow 4 represents a phase change from gas to liquid.
In other words, arrow 1 and arrow 4 are direct opposites of one another,
This means that if X amount of energy is required for arrow 1, the same amount of energy will be needed for arrow 4 but in the reverse direction.
More on phase change can be found here: brainly.com/question/12390797
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