Universal Solvent

Q.

Lemonade is prepared by mixing lemon juice and sugar in water.You wish to add ice to cool it.Should you add ice to the lemonade before or after dissolving sugar?In which case would it be possible to dissolve more sugar? Does water dissolve an equal amount of salt and sugar? What can be done to dissolve more salt in a saturated solution of water and salt? [5 MARKS]

Q.

Water is a universal solvent Give reason for your answer

Q.

Question 10

Lemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which case would it be possible to dissolve more sugar?

Q.

What are the advantages of using no solvent in a reaction?

Q. Mention some materials that float and sink in water. What is the reason behind this property?

Q.

More substances can be dissolved in a solution using heating. True/False

1. True

2. False

Q.

Why we should add ice after after dissolve sugar in the lemonade why not befor

Q. The volume of water increases on cooling. So, does it mean that it can dissolve more salt then?

Q. Object A has more density than object B, while object B has more density than water.
Which object will sink in water?

1. A
2. B
3. Both A and B
4. Neither A nor B

Q. Water is a universal solvent.

1. True
2. False

Q.

Why water is called a universal solvent ?

Q.

Most of the substances cannot be dissolved in solution by heating.

1. True

2. False

Q. Sugar is added to a cup of water. Here, sugar is the _____.

1. solute
2. solution
3. solvent
4. mixture

Q. ________is known as the universal solvent.

1. Alcohol
2. Benzene
3. Ether
4. Water

Q. ______ is called a universal solvent.

1. Alcohol
2. Petrol
3. Ether
4. None of the above

Q.

Question 5

(a) Why do some objects sink into water?

(b) Which of the following substances sink into water?

Stone, sponge, iron nail, metal key and flower.

(c) In a glass tumbler, it was observed from top to bottom – oil→water→honey were present in different layers. What can you tell about the density of honey with respect to water?

Q. Which among the following is the universal solvent?

1. Hydrogen
2. Oxygen
3. Water
4. Nitrogen

Q.

Water is called a _____________ solvent.

Q. _________ is called a universal solvent.

1. Water
2. Petrol
3. Alcohol
4. Ether

Q. Water is called the universal solvent because:

1. it dissolves in most of the liquids
2. it contains many salts and minerals
3. it can exist in three states
4. it can dissolve most of the substances

Q. A mixture in which one component is completely dissolved in another is known as a _________.

1. 
2. 
3. 
4. 

Q. Which of the following when mixed with water form a layer on the surface?

1. Salt
2. Sugar
3. Oil
4. Milk

Q. Densities of a few objects are given below:

Object	Density(g/L)
Copper utensil	8.96
Oil	0.88
Water	1.00

What would be the observation if copper utensil and oil are placed in water? [3 marks]

Q. Densities of a few objects are given below:
$\begin{array}{cc}\text{Object}& \text{Density(g/L)}\\ \text{i. Copper utensil}& \text{a. 8.96}\\ \text{ii. Iron box}& \text{b. 7.85}\\ \text{iii. Water}& \text{c. 1.00}\end{array}$
What would be the observation if copper utensil and iron box are placed in water?

Q. Rohit placed a sponge and a stone in two different bowls filled with water. What would he observe?

1. Stone floats on water.
2. Sponge floats on water.
3. Both floats on water.
4. Both sinks in water.

Q. Rohit placed a sponge and a stone in two different bowls filled with water. What would he observe?

1. Both sinks in water.
2. Sponge floats on water.
3. Stone floats on water.
4. Both floats on water.