how will knowing the density of a substance help you determine whether an object made from that material will float in water
2 answers:
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Answer:
D) 4-ethyl-4-methylheptane
Explanation:
The rules for naming of alkanes with substituents.
1. The carbon chain with the maximum number of carbon atoms must be selected as a parent chain.
2.Numbering should be done in such a way that each substituent gets the least number.
3. Substituents whose name comes before the another substituents's name in the English alphabet is written first.
4. Substituents are written first with their location in the chain and the name of the parent chain is done. Numbers are separated from numbers by comma and numbers are separated from letters by using hyphen.
Considering (a) 3,6-dimethylheptane
<u>Violation of Rule - 2 mentioned above</u>
The numbering of the parent chain is not done in a right way. Numbering must be done such that each substituent gets the least number. So, The correct name is 2,5-dimethylheptane
Considering (b) 2-ethyl-3-methylheptane
<u>Violation of Rule - 1 mentioned above.</u>
The carbon chain with the maximum number of carbon atoms must be selected as a parent chain. The parent chain selected is of 7 carbon atoms but the parent chain is of 8 carbon atoms. So, The correct name is 3,4-dimethyloctane
Considering (c) 5-methyl-3-ethylheptane
<u>Violation of Rule - 3 mentioned above.</u>
'e' comes before 'm' . So, ethyl- is written first than methyl- . So, The correct name is 3,6-dimethyloctane
Considering (d) 4-ethyl-4-methylheptane
<u>This is a IUPAC name and following all the rules mentioned above.</u>
Answer:
C.
Explanation:
Specific heat capacity of a substance can be defined as the amount of heat a gram of the substance must lose or absorb in order to change its temperature by a degree Celsius. It is measured in Joules per kilogram per degree Celsius (J/kg°C).
Generally, the specific heat capacity of water is 4.182J/kg°C and is the highest among liquids.
Heat capacity or quantity of heat is given by the formula;
Where;
Q represents the heat capacity or quantity of heat.
m represents the mass of an object.
c represents the specific heat capacity of the substance.
dt represents the change in temperature.
Hence in calculating the relationship between the amount of heat added to a substance and the corresponding temperature change, the specific heat capacity is usually represented by the symbol C.