(A) iron + hydrochloric acid --> iron chloride + hydrogen. Hydrochloric acid (HCl) separates into H+ and Cl- ions. The Cl- ions bond ionically with the iron creating a stable compound and the H+ ions pair up stablaising the H ions
(B) Hydrogen gas is given off. The test for hydrogen is that a lit splint burns with a squeaky pop when in contact with hygrogen
Answer: By shifting the equilibrium to align with the interest of the company.
Explanation: Major production companies depend on the principle of chemical equilibrium to normalize their production depending on their interests. This principle is called Le Chatelier's principle.
The major concern of Chemical industries is their output and production time. Knowledge of Chemical equilibrium can help to maximize the output in a relatively less time by considering some factors.
Factors such as Temperature, Pressure, Concentration, and Catalyst presence can change the chemical equilibrium to benefit companies.
Explanation:
Entropy refers to the degree of disorderliness of system. Basically it refers to how random a system is.
Gong through the options.
A. The phase change is from solid to liquid. Liquid has a greater degree of disorderliness compared to solid hence entropy is increasing.
B. The phase change is from solid to gas. Gas particles has a greater degree of disorderliness compared to solid hence entropy is increasing.
C. The phase change is from aqueous to liquid. Aqueous solutions has a greater degree of disorderliness compared to liquid hence entropy is decreasing.
D. The reactant side has; solid + gas. In the product side, there is only gas. The product side has a greater degree of disorderliness hence the entropy is increasing.
E. The entropy of the product is greater than the entropy of the reactants hence entropy is increasing.
F. The phase change is from aqueous to solid. Aqueous solutions has a greater degree of disorderliness compared to solid hence entropy is decreasing.
The number of <u>protons</u> in the nucleus determines an element's atomic number.
The answer is A
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