Unit 3 “ Understand The Chemical Properties Of Substance”

Question 1

What is the definition of amphoteric substances?

Answer 1

Amphoteric substances can act as both acids and bases.

Question 2

True or False: Alumina (Al2O3) is an example of an amphoteric oxide.

Answer 2

True

Question 3

Fill in the blank: Alumina can react with both _______ and _______ solutions.

Answer 3

acids, bases

Question 4

What is the chemical formula for alumina?

Answer 4

Al2O3

Question 5

Which reaction demonstrates the acidic behavior of alumina?

Answer 5

Alumina reacts with sodium hydroxide (NaOH) to form sodium aluminate.

Question 6

What happens when alumina reacts with hydrochloric acid (HCl)?

Answer 6

It forms aluminum chloride (AlCl3) and water.

Question 7

In which type of solution does alumina act as a base?

Answer 7

In alkaline solutions.

Question 8

Multiple Choice: Which of the following is NOT a property of amphoteric alumina? A) Reacts with acids B) Reacts with alkalis C) Reacts only with water D) Neutralizes both acids and bases.

Answer 8

C) Reacts only with water

Question 9

What is the role of amphoteric alumina in industrial processes?

Answer 9

It is used in the production of aluminum and as a catalyst in various chemical reactions.

Question 10

True or False: The amphoteric nature of alumina makes it useful in both acidic and basic environments.

Answer 10

True

Question 11

What is the general formula for metal oxides?

Answer 11

Metal oxides can generally be represented as MO, where M is a metal and O is oxygen.

Question 12

True or False: Metal oxides are typically acidic in nature.

Answer 12

False

Question 13

Fill in the blank: Metal hydroxides are generally formed from metal oxides reacting with ______.

Answer 13

water

Question 14

Which of the following metal oxides is considered to be a strong base: Na2O, Al2O3, or CO2?

Answer 14

Na2O

Question 15

What type of reaction occurs when metal oxides react with acids?

Answer 15

Neutralization reaction

Question 16

Name one property that characterizes metal hydroxides.

Answer 16

They are generally soluble in water and produce hydroxide ions.

Question 17

Multiple Choice: Which metal hydroxide is commonly used in antacids? A) Mg(OH)2 B) Fe(OH)3 C) Al(OH)3

Answer 17

A) Mg(OH)2

Question 18

What is the base character of metal oxides related to?

Answer 18

The electronegativity of the metal and its ability to donate electrons.

Question 19

True or False: All metal oxides are bases.

Answer 19

False

Question 20

What is the role of metal hydroxides in water treatment?

Answer 20

They are used to neutralize acids and remove heavy metals.

Question 21

Fill in the blank: The base strength of metal oxides increases with ______ of the metal.

Answer 21

decreasing electronegativity

Question 22

Which of the following is a strong base: Ca(OH)2, Zn(OH)2, or Cu(OH)2?

Answer 22

Ca(OH)2

Question 23

What happens when a metal oxide reacts with a non-metal oxide?

Answer 23

It can form a salt and water.

Question 24

Short Answer: Why are alkali metal oxides considered strong bases?

Answer 24

They readily dissociate in water to produce hydroxide ions.

Question 25

What is the effect of temperature on the solubility of metal hydroxides?

Answer 25

Generally, the solubility of metal hydroxides increases with temperature.

Question 26

What is electrolysis?

Answer 26

Electrolysis is a chemical process that uses electrical energy to drive a non-spontaneous chemical reaction.

Question 27

True or False: Electrolysis can only occur in liquid solutions.

Answer 27

False

Question 28

Fill in the blank: The ease of electrolysis is influenced by the ______ of the electrolyte.

Answer 28

concentration

Question 29

What is the primary factor that determines the ease of electrolysis?

Answer 29

The conductivity of the electrolyte.

Question 30

Multiple Choice: Which of the following factors does NOT affect the ease of electrolysis? A) Temperature B) Pressure C) Color D) Concentration

Answer 30

C) Color

Question 31

What role does voltage play in electrolysis?

Answer 31

Higher voltage can increase the rate of electrolysis by overcoming activation energy barriers.

Question 32

True or False: The type of electrodes used can influence the ease of electrolysis.

Answer 32

True

Question 33

Fill in the blank: The process of electrolysis involves the movement of ______ towards the electrodes.

Answer 33

ions

Question 34

What is the term for the minimum voltage required to initiate electrolysis?

Answer 34

Threshold voltage or decomposition voltage.

Question 35

Multiple Choice: Which of the following is a common application of electrolysis? A) Water splitting B) Photosynthesis C) Respiration D) Combustion

Answer 35

A) Water splitting

Question 36

What happens at the anode during electrolysis?

Answer 36

Oxidation occurs at the anode.

Question 37

True or False: Increasing the temperature generally decreases the ease of electrolysis.

Answer 37

False

Question 38

Fill in the blank: The ease of electrolysis can be enhanced by using ______ electrolytes.

Answer 38

strong

Question 39

What is the significance of the electrode material in electrolysis?

Answer 39

Different materials have varying catalytic properties affecting reaction rates.

Question 40

Multiple Choice: Which electrolyte is commonly used in the electrolysis of water? A) Sodium chloride B) Acetic acid C) Sulfuric acid D) Sodium bicarbonate

Answer 40

C) Sulfuric acid

Question 41

What is the effect of ion mobility on electrolysis?

Answer 41

Higher ion mobility increases the ease of electrolysis.

Question 42

True or False: Electrolysis can only be performed in a lab setting.

Answer 42

False

Question 43

Fill in the blank: The efficiency of electrolysis can be affected by the ______ of the electrodes.

Answer 43

surface area

Question 44

What is the impact of impurities in the electrolyte on electrolysis?

Answer 44

Impurities can hinder the efficiency and rate of electrolysis.

Question 45

Multiple Choice: What is produced at the cathode during the electrolysis of water? A) Hydrogen B) Oxygen C) Chlorine D) Sodium

Answer 45

A) Hydrogen