Answer: Species may become extinct because of changes in climate. competition with other species, a reduced food supply, or combinations of all of these. Most natural extinctions are isolated events that happen over a fairly long period of time
Explanation:
Answer:
Atoms of Zn (s) lose electrons and are oxidized. Atoms of Zn (s) lose electrons and are reduced. There is a net loss of mass. There is a net gain of mass.
Explanation:
Thermal conductivity of a substance affects it's ability to heat or to be heated by its surroundings.
This happens because as the temperature increases the kinetic energy which is possessed by the molecules also increases as there is increased collision between the molecules which leads to increase in the thermal conductivity of substance.
<h3>What is thermal conductivity?</h3>
It is defined as the ability of a substance to provide conduction of heat.Higher the thermal conductivity of a substance, more rapidly it will conduct heat and lower values of thermal conductivity depict low rate of conduction of heat.
Thermal conductivity depends on 3 factors namely,temperature, moisture content and density.
Learn more about thermal conductivity,here:
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Answer:
High
Explanation:
When the unknown compound contains an impurity that is insoluble in cyclohexane, the solute will not dissolve in the solvent (cyclohexane) completely. ∆T of the solution would be smaller than it is supposed to be, when compared to a compound without such insoluble impurity. Molecular weight determination won't be accurate because the molecular weight obtained will be higher as a result of the fact that the mass of the solute would include the actual solute that is changing the temperature and the excess mass of the impurity.
Molarity is defined as number of moles of the solute in 1 liter of solution.
Molarity = Moles of solute (mol) / Volume of the solution (L)
moles of KCl = mass (g) / molar mass (g/mol)
= 10.0 g / 74.5 g/mol
= 0.134 mol
Hence molarity = 0.134 mol / 0.500 L
= 0.268 mol/L