Acid And Alkali

Question 1

What are acids and alkalis?

Answer 1

Two groups of chemicals that are incredibly useful in everyday life but can be dangerous.

Question 2

What is a hazard?

Answer 2

Something that can cause harm.

Question 3

What is a hazard symbol?

Answer 3

Used to show the level and type of danger.

Question 4

What does the corrosive hazard symbol indicate?

Answer 4

The substance can attack metals, stoneware, and skin.

Question 5

What does the toxic hazard symbol indicate?

Answer 5

The substance is poisonous.

Question 6

What does the irritant hazard symbol indicate?

Answer 6

The substance is not corrosive but can still hurt you.

Question 7

What happens if acids are strong?

Answer 7

They are likely to be labelled with hazard symbols.

Question 8

What happens if acids are weak?

Answer 8

They are safe to handle and will not have hazard labels.

Question 9

What is concentration?

Answer 9

A measure of the number of particles in a given volume.

Question 10

What are concentrated strong acids?

Answer 10

They can be very concentrated and very dangerous (corrosive).

Question 11

How can strong acids be made less dangerous?

Answer 11

They can be diluted with water, making them irritants.

Question 12

What happens to the pH of an acid when it is diluted?

Answer 12

The pH does not change with it being concentrated or dilute.

Question 13

What is the pH scale?

Answer 13

The pH scale measures how acidic or alkaline a substance is.

Question 14

What is an acid?

Answer 14

An acid is a substance that has a pH lower than 7.

Question 15

What is an alkali?

Answer 15

An alkali is a soluble substance with a pH higher than 7.

Question 16

What is a base?

Answer 16

A base is a substance that neutralises an acid.

Those that dissolve in water are called alkalis.

Question 17

What is the pH of a neutral substance?

Answer 17

The pH of a neutral substance is 7.

Question 18

What is the pH range for acids?

Answer 18

The pH range for acids is below 7.

Question 19

What is the pH range for alkalis?

Answer 19

The pH range for alkalis is above 7.

Question 20

What does pH refer to?

Answer 20

pH refers to the potential of Hydrogen.

Question 21

What is produced when a metal reacts with an acid?

Answer 21

When an acid reacts with a metal, it releases hydrogen gas.

Question 22

What is the result of burning hydrogen gas?

Answer 22

Burning of hydrogen gas produces a pop sound.

Question 23

What do strong acids produce?

Answer 23

The stronger the acid, the more hydrogen gas is produced.

Question 24

What do weak acids produce?

Answer 24

Weak acids produce less hydrogen gas compared to strong acids.

Question 25

Do alkalis produce hydrogen gas?

Answer 25

Alkalis do not produce hydrogen gas.

Question 26

How does hydrogen burn?

Answer 26

Hydrogen burns with a pop sound and is a very flammable gas.

Question 27

What is the relationship between acids and hydrogen production?

Answer 27

Acids have the potential to produce hydrogen, whilst alkalis do not.

Question 28

What acids are found in everyday life?

Answer 28

Examples include: - Citric acid in citrus fruits like lemons, limes, and oranges. - Tannic acid in tea. - Lactic acid in sour milk. - Methanoic acid from ants. - Tartaric acid in grapes. - Acetic acid in vinegar. - Sulfuric acid in car batteries. - Hydrochloric acid in human stomachs.

Question 29

What acids are found in the lab?

Answer 29

Examples include: - Hydrochloric acid (HCl) - Sulfuric acid (H2SO4) - Nitric acid (HNO3)

Question 30

What is the taste of acids?

Answer 30

Acids have a sour taste.

Question 31

What do acids produce with metals?

Answer 31

They produce hydrogen gas with a metal.

Question 32

What ions do acids contain?

Answer 32

Acids contain H+ ions.

Question 33

What is an example of an alkali used in soap?

Answer 33

Soap is an alkali.

Question 34

What do indigestion tablets contain?

Answer 34

Indigestion tablets contain alkalis.

Question 35

What is baking powder classified as?

Answer 35

Baking powder is an alkali.

Question 36

What do toothpaste products contain?

Answer 36

Toothpaste contains alkalis.

Question 37

What type of sting is considered an alkali?

Answer 37

Wasp stings are an alkali.

Question 38

What is ammonia cleaning fluid classified as?

Answer 38

Ammonia cleaning fluid is an alkali.

Question 39

Where are alkalis commonly found?

Answer 39

They are found in cleaning products.

Question 40

What is the feel and taste of alkalis?

Answer 40

They have a soapy feel and bitter taste.

Question 41

What are detergents classified as?

Answer 41

Detergents are alkalis.

Question 42

What do alkalis contain that is significant?

Answer 42

Alkalis have OH (hydroxide) in them.

Question 43

What is an example of a hydroxide alkali?

Answer 43

Example: Potassium hydroxide (KOH) and sodium hydroxide (NaOH).