Answer:
a) Change in internal energy of the system = - 135.2 J
b) Change in internal energy of the environment = 135.2 J
Explanation:
From the mathematical statement of the first law of thermodynamics,
ΔU = Q - W
ΔU = Change in internal energy of the system = ?
Q = heat transferred into or out of the system. For this system, heat is transferred into it, Q = 77.8 J
W = workdone = 213 J (positive because work is done by the system on the environment)
ΔU = 77.8 - 213 = - 135.2 J
The change in internal energy of the environment is just the negative of that of the system. The balance is always so.
Hence, change in internal energy of the environment = -(- 135.2) = 135.2 J
>there is restricted rotation around the carbon-carbon double bond. (TRUE)
>the stability of the carbon-carbon double bond increases as the
number of substituent groups increases. (TRUE)
>whenever the two groups on each end of a carbon-carbon double bond
are the same, two diastereomers are possible. (TRUE)
>trans alkenes are generally more stable than cis alkenes. (NOT TRUE)
Answer:
12 to 14
Explanation:
drain cleaners contain sodium hydroxide or potassium hydroxide which are strong bases . The pH value of sodium hydroxide and potassium hydroxide is 14 and 12 respectively on the pH scale. So, most drain cleaners have a pH of from 12 to 14, regardless of how much L there are.
Atoms<span> are made up of three particles: protons, neutrons and electrons. Protons and neutrons are heavier than electrons and reside in the center of the </span>atom, which is called the nucleus<span>. Electrons are extremely lightweight and exist in a cloud orbiting the </span>nucleus.
Platinum plus chlorine equals 0.889 grams whereas the platinum alone is 0.509grams so 0.509/0.889grams = 57% of the mass of the platinum plus chlorine. The chlorine would be 0.889-0.509=0.38 grams. The chlorine would make up about 42.7% of the total mass in grams.
