Site Title
Fill inthe blanks:
1. The density of water is 1 g/cc.
2. Volume is measured in cubic centimeter.
Match the Pair:
1. Dead Sea-25% salts
2. Water - Compound
True or False:
1. The volume of water is maximum at 4 degree celsius-False
2. A solution is mixture of solute and a solvent. - True
Answer in one sentence:
1. Define density of a substance.
Ans: The mass of a unit volume of a substance is called the density of the substance.
2. Why water is called universal solvent?
Ans: Many substances dissolve in water, it is called a universal solvent.
Answer in Short:
1. State the properties of water.
Ans: Water is colourless, odorless, tasteless and transparent and liquid at normal temperature. Water is chemically neutral. Many substances dissolve in water. Water does not react with substance dissolve in it. This property makes water an ideal medium for most chemical reactions.
2. Why ice floats on water?
Ans: Whether an object will float or sink depends not upon its mass but upon its volume or size. The volume of ice is greater than water. So, ice floats on water.
Define:
Give Reasons:
1. Water is an ideal medium for chemical reactions.
Ans: Many substances dissolve in water. Water does not react with substance dissolve in it. This property makes water an ideal medium for most chemical reactions.
Solute: The substance that dissolves is called the solute.
Solvent: The substance in which solute dissolves is called the solvent.
Solution: When the solute and solvent are completely mixed in each other we get a solution.
Answer the following question by observing picture.
1. What is the picture about?
Ans: The picture is about the Dead Sea.
2. Where does this sea located?
Ans: Dead sea is located on the borders of Israel and Jordan in the Middle East.
3. How much salt this sea water contains?
Ans: Dead sea water contains 23% to 25% of salt.
4. Which salts are present in this sea?
Ans: Salts of magnesium chloride and calcium chloride and bromide are present in this sea.
5. Is this possible as shown in the picture at this sea?
Ans: The density of water of the Dead Sea is much greater than normal water so there is no danger of drowning in it.