Energy is required to change the phase of a material, with the change in energy either it decreases or increases.
When the phase is changed, the temperature and kinetic energy does not change it stays the same but the internal energy changes.
Internal energy is the sum of chemical potential energy and kinetic energy of the molecules, and when the internal energy changes during a phase change it means average potential energy is changing.
Answer:
The correct answer will be option-instructions for each specific function
Explanation:
DNA is known as the genetic and heredity material of the organism which provides instructions to the cell to perform functions.
The biochemistry of DNA suggests that the arrangement of different nitrogenous bases controls different functions of the cell as they form proteins through the transcription and translation process.
Therefore, DNA controls the cell and its function by providing instructions to the organelles in the form of proteins and thus, the selected option is the correct answer.
Answer: The statement molecule 
cannot be accurately described by a Lewis structure consistent with the octet rule, is true.
Explanation:
As the chemical formula of water is 
and since it contains electronegative oxygen atom which also has 2 lone pair of electrons. Hence, lone pair-bond pair repulsion occurs due to which water has a bent shape structure.
The compound LiF contains metal lithium and non-metal fluorine. In order to obtain stability lithium donates its valence electron to the fluorine atom leading to the formation of an ionic bond. Hence, LiF is an ionic compound and not a covalent compound.
Generally, ionic compounds are polar in nature. For example, KOH is a polar compound and 
is a non-polar compound.
Thus, we can conclude that the statement molecule cannot be accurately described by a Lewis structure consistent with the octet rule, is true.
Sulfanilamide, an antibacterial drug, was being used safely in the treatment of streptococcal infections.
Answer: 1) 
2) 
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The process of converting long chain hydrocarbons are broken into smaller hydrocarbons is called as cracking.
1)
2)
