Презентация chemical reaction

CHECK HOMEWORK Divide the pictures on the chemical and physical phenomena

Chemical Physical

• Rain
• Fog
• Thunder

• Rusting of iron
• Fire
• Rotting leaves

the theme of the lesson

Chemical reactions and their signs

Pronouncing and memorizing words

• Реакция - reaction
• Признаки - signs
• Изменение - change
• Запах - odor
• Температура - temperature
• Пузыри - bubbles
• Твердое вещество - solid

• Необычный - unusual
• Воздух - air
• Горение - burning
• Цвет - color
• Оболочка – shell
• Осадок - precipitate
• Химический - chemical

WORKING WITH TEXT

• You may not be able to see that any new substances have formed during a change. Below are some signs that a chemical change may have occurred. If you observe two or more of these signs during a change, you most likely are observing a chemical change

• Возможно, вы не сможете увидеть, что во время изменения произошли какие-либо новые вещества. Ниже приведены некоторые признаки того, что может произойти химическое изменение. Если вы наблюдаете два или более из этих признаков во время изменения, вы, скорее всего, наблюдаете химическое изменение

PRODUCTION OF A ODOR (выделение запаха)

• Some chemical changes produce new smells. The chemical change that occurs when an egg is rotting produces the smell of sulfur.

Change in Temperature (изменение температуры)

• Chemical changes often are accompanied by a change in temperature. You may have noticed that the temperature is higher near logs burning in a campfire.

Change in Color (изменение цвета)

• A change in color is often an indication of a chemical change.

Formation of Bubbles (образование пузырей выделение газа )

• When an antacid tablet makes contact with water, it begins to bubble. The formation of gas bubbles is another indicator that a chemical change may have occurred.

Приведите свой примеры

Bring your examples

Formation of bubbles

Change in color

Change in temperarure