Given:
64.82 g of aluminum metal
100.0oC is cooled to 82.0 °C
specific heat of aluminum is 0.897 J /g °C.
Required:
Change in heat energy
Solution:
This can be solved through the equation H = mCpT where H is the heat, m is the mass, Cp is the specific heat and T is the change in temperature.
The specific heat of the water is 4.18 J/g-K
Plugging in the values into the equation
H = mCpT
H = (64.82) (0.897 J /g °C) (82 – 100)
H = -1,046.6 J
B. water boils.
C. water freezes.
D. molecular motion stops.
b. The cations in the salt bridge will migrate to the anode half-cell
c. The cathode will gain mass
d. The anode will lose mass
e. Reduction will occur at the cathode
Answer:
The reagents needed are Br₂ and FeBr₃
Explanation:
In order to make 3-bromo-5-isopropyltoluene starting with m-isopropyltoluene we need to add Bromine (Br₂) and Iron(III) bromide (FeBr₃).
Please see attached picture for the resulting product, 3-bromo-5-isopropyltoluene.
True
False
B) exothermic
C) reversible
D) irreversible
Answer: B) exothermic
Explanation:
Endothermic: The chemical reactions in which reactants form products by absorption of energy are called as endothermic reactions.
Exothermic : The chemical reactions in which reactants form products along with release of energy are called as exothermic reactions. Thus if walls turn hot that means the energy has been released.
Reversible: The chemical reactions in which reactants form products and products can also be converted back to reactants are called as reversible reactions.
Irreversible: The chemical reactions in which reactants form products but products can not be converted back to reactants are called as irreversible reactions.
In the reaction of hydrochloric acid and calcium carbonate, to balance the equation, the correct order of numbers would be 2 for HCl, and 1 for CaCO3, CaCl2, CO2, and H2O.
When hydrochloric acid (HCl) reacts with calcium carbonate (CaCO3) in concrete, it forms calcium chloride (CaCl2), carbon dioxide (CO2), and water (H2O). To balance this reaction, you could input the numbers: 2 HCl(aq) + 1 CaCO3(s) → 1 CaCl2(aq) + 1 CO2(g) + 1 H2O(l). This phenomenon is part of the larger concept known as a neutralisation reaction, where an acid reacts with a base to produce a salt and water. In this case, the hydrochloric acid is the acid and the calcium carbonate in the concrete is the base. This is also an example of a gas evolution reaction, as carbon dioxide gas is being produced.
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