Answer:
Water is not a good solvent choice.
Explanation:
While water is good solvent because of its polotiry. Water is not good for the recrystallization process becuase being a good recystallization solvent means that a compound must dissolves easily when the solvent is warm, but that is less soluble at room temperature or when cooled in an ice bath. Water has the dissolves when warm part down. But for the cooled part which is the most important it can not do.
Answer:
Lavoisier made an important contribution to chemistry by the law of conservation of mass
Explanation:
The law of conservation of mass tell us, that the mass doens't change in a system. You have the same mass at the begining and in the end of a reaction.
Matter is neither created, nor destroyed in a chemical reaction.
This law also states that mass of reactants is the same of products in any chemical reaction
Answer:
10425 J are required
Explanation:
assuming that the water is entirely at liquid state at the beginning , the amount required is
Q= m*c*(T final - T initial)
where
m= mass of water = 25 g
T final = final temperature of water = 100°C
T initial= initial temperature of water = 0°C
c= specific heat capacities of water = 1 cal /g°C= 4.186 J/g°C ( we assume that is constant during the entire temperature range)
Q= heat required
therefore
Q= m*c*(T final - T initial)= 25 g * 4.186 J/g°C * (100°C- 0°C) = 10425 J
thus 10425 J are required
Explanation:
(a) Dry ice is solid carbon dioxide and its chemical formula is solid 
.
(b) Sodium chloride is commonly known as salt in daily life. Hence, chemical formula of salt is NaCl.
(c) Laughing gas is also known as dinitrogen monoxide. Hence, its chemical formula is 
.
(d) Marble (chalk limestone) is chemically known as calcium carbonate. Hence, its chemical formula is 
.
(e) Baking soda is chemically known as sodium bicarbonate. Hence, its chemical formula is 
.
(f) Ammonia has a chemical formula as 
.
(g) Water has a chemical formula as 
.
(h) Milk of magnesia is a base and it is chemically known as magnesium hydroxide. Its chemical formula is 
.
(i) Epsom salt is most often found as heptahydrate of sulfate mineral epsomite. Its chemical formula is usually 
. If not present as a heptahydrate then its chemical formula is 
where, value of x can be equal to 0 to 7.
