Answer:
3.16g
Explanation:
Data obtained from the question include:
I = 4A
t = 40mins = 40 x 60 = 2400secs
Q =?
Q = It
Q = 4 x 2400
Q = 9600C
Now let us generate a balanced half equation to determine the number faraday needed to deposit metallic Cu. This is illustrated:
Cu^2+ + 2e —> Cu
From the equation,
2 faraday is needed to deposit metallic cu
1 faraday = 96500C
Therefore 2 faraday = 2 x 96500 = 193000C
Molar Mass of Cu = 63.5g/mol
193000C deposited 63.5g of Cu
Therefore, 9600C will deposit = (9600 x 63.5)/193000 = 3.16g of Cu
Answer:
The reason is that there are radioactive elements that are in the center of the earth.
Explanation:
If the earth were only a rock cooling from the time of its birth. It should have already cooled completely thousands of years ago. However, volcanoes continue to shed hot magma and this is proof that there is a source of heat in the center of the earth. This source of heat is due to the radioactivity of elements such as Uranium and Thorium that were enclosed during the formation of the earth. These elements slowly disintegrate emitting particles that collide with others emanating heat. For example, the half-life of uranium is 4.5 billion years, which means that it decays very slowly.
B. For the balloon to float in air, what two factors might have changed about the balloon?
Answer those two questions of you know the answer.
Methanol has severl uses few of which are discussed below.
Methanol is the simplest alcohol with chemical formula CH3OH. Its nin drinkable because its toxic when consumed.
Methanol is used for preparing acetaldehyde, formaldehyde, butandiol, acetal resins etc which are used for production of furthur high specific chemicals with high rate of purity. Its also used widely in automobile industry.
Its used to produce acetic acid, solvent esters and acetates, terepthalic acid, etc which are used in automobiles, paint industry, ink industry etc.
Its used in preparation if zero emmision fuels. Its also used to produce antifreeze, lubricants, burning alcohol, spirit etc.
Its also used to produce different cleaners and canned heat.
Its used to dress wounds, for preparation of MMA, MTOs etc.
nucleus
B.
electron
C.
neutron
D.
proton
Calcium is very reactive, has properties similar to magnesium, and is in the same period as bromine.
Properties are defined as the qualities that help us distinguish one material from another.
There are basically two types of properties.
Reactive is defined as the catalyst for a chemical process, either on its own or in combination with other materials.
It can also be defined as the propensity of a substance to undergo chemical reaction and release energy, either by itself or in conjunction with other materials.
Thus, calcium is very reactive, has properties similar to magnesium, and is in the same period as bromine.
To learn more about properties, refer to the link below:
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