"Понятие кислот и их взаимодействие с другими веществами"

1. Learn the words

   acids	кислота	combine	соединять
   Dill pickles	Соленые огурцы	Hydrogen	водород
   contain	содержать	bubbles	пузырьки
   oxide	оксид	rust	ржавчина
   common	распространенный	remain	оставаться
   carbonate	карбонат	Baking soda	Пищевая сода
   mixture	смесь	deposit	осадок
   dough	тесто	limestone	известняк
   perhaps	возможно	Salad dressing	Заправка для салата
   tangy	острый	vinegar	уксус

2. Read the text

Acids

Chemicals which are sour are called acids. Acids have a sour taste. Lemons and dill pickles contain acids. Most kinds of fruit have acids.

Acids combine with metal to form hydrogen gas and salt. Hydrogen can be made if we place a nail in lemon juice. The bubbles on the nail are the bubbles of hydrogen gas.

When the base and acid have combined, only salt and water remain. Acids combine with oxides to form water and salt. Rust is a common oxide. If rust is placed on the acid, water and salt will remain.

When a carbonate is combined with an acid, carbon dioxide gas is formed. Baking soda is a carbonate. If we add baking soda to vinegar, the mixture will produce carbon dioxide in the form of bubbling.

Acid gives one of its protons away to that substance with which it combines. When an acid gives away its proton it will no longer an acid.

1. Answer the questions:

1. What are acids?

2. What food contains acids?

3. What will be formed if combine metal and acids?

4. What will be formed if acids combine with bases?

5. What is a common oxide?

6. What will be remained if rust is placed in an acid?

7. What will be formed if carbonate is combined with an acid?

8. What does acid do with its proton when it combines with another substance?

1. Match the parts of the statements

Rust

Carbonate

Acids have

Acids with oxides

Is baking soda

Sour taste

Form water and salt

Is oxide

Acids

Chemicals which are sour are called acids.

Acids have a sour taste.

Lemons and dill pickles contain acids.

Most kinds of fruit have acids.

Acids change the color of blue litmus paper to red.

Acids combine with metal to form hydrogen gas and salt.

Acid + metal = hydrogen gas and salt

Hydrogen can be made if we place a nail in lemon juice.

The bubbles on the nail are the bubbles of hydrogen gas.

When the base and acid have combined, only salt and water remain.

Acid + Base = Salt and water

Acids combine with oxides to form water and salt.

Rust is a common oxide.

Rust is iron combined with oxygen.

If rust is placed in the acid, water and salt will remain.

Acid + oxide (rust) = water and salt

When a carbonate is combined with an acid, carbon dioxide gas is formed.

Acid + carbonate = carbon dioxide

Baking soda is a carbonate.

If we add baking soda to vinegar, the mixture will produce carbon dioxide in the form of bubbling.

Acids give one of their proton away to that substance with which they combine.

When an acid gives away its proton it will no longer an acid.

+ =

chlorine hydrogen oxygen