7.1 The characteristics properties of acids and bases

Question 1

Acids contain ___1____ and ____2____ to release ____3_______.

Answer 1

1. hydrogen 2. dissolve in water 3. hydrogen (H+) ions

Question 2

Acids are ___1____ tasting and __2____.

Answer 2

1. sour 2. corrosive

Question 3

Bases are equally ___1_____ and are generally ____2____ to the touch.

Answer 3

1. corrosive 2. soapy

Question 4

Bases has historically has been used in the manufacture of ________.

Answer 4

soap

Question 5

Acids and bases can be thought of as ___________.

Answer 5

chemical opposites.

Question 6

Define what is acids

Answer 6

A substance with particular chemical properties including turning litmus red, neutralizing alkalis, and dissolving some metals; typically, a corrosive or sour-tasting liquid of this kind.

Question 7

Define what is bases

Answer 7

a substance that can neutralize the acid by reacting with hydrogen ions.

Question 8

Acids contain ___1____ ions, ___2____ in water, ___3___ to the taste, and ___4____.

Answer 8

1. H+
2. soluble
3. sour
4. corrosive

Question 9

Bases contains ____1___, ____2____, and _____3_____.
Some bases are ___4_____ in water and are called ___5___.
They are ___6___ to the touch. Also they are ___7____ like acids

Answer 9

1. metal oxides
2. carbonates
3. hydroxides
4. soluble
5. Alkalis
6. soapy
7. corrosive

Question 10

Define the word of Indicators.

Answer 10

A substance that changes colour depending if it is in the presence of acid or base. / is a chemical substance that changes colour with changing H+ concentration.

Question 11

Indicators can identify if a substance is __1___ or __2____.

Answer 11

1. Acid
2. Alkali

Question 12

Define the word of universal indicator

Answer 12

A blend of different indicators that changes colour across the pH scale.

Question 14

• Litmus (color in acids is __1____ and color in bases is __2___. )
• methyl orange (color in acids is ___3___ and color in bases is ___4__. )
• Universal indicator paper (color in acids is __5___ and color in bases is __6____)
• thymol phthalein (color in acids is ___7___ and color in bases is __8____)

Answer 14

1. red
2. blue
3. red
4. yellow
5. strong - red / weak - orange or yellow
6. strong - purple / weak - blue
7. coloursless
8. blue