do now! whilst you are waiting can you answer some of the questions on the sheet?
TRANSCRIPT
![Page 1: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/1.jpg)
Do now!Whilst you are
waiting can you answer some of the
questions on the sheet?
![Page 2: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/2.jpg)
Last lesson
• Know how to tell if a chemical reaction has taken place
• Know what neutralisation is
• Know the general equation for the reaction between an acid and a base
• Know how to write a word equation for the reaction between an acid and a metal oxide
![Page 3: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/3.jpg)
Chemical reactions – What to look for
![Page 4: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/4.jpg)
Chemical reactions – What to look for
• There may be a change of colour
![Page 5: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/5.jpg)
Chemical reactions – What to look for
• There may be a gas given off (bubbles)
![Page 6: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/6.jpg)
Chemical reactions – What to look for
• There may be an energy change (gets hotter or colder)
![Page 7: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/7.jpg)
Chemical reactions – What to look for
• New substances are formed, and the change is usually difficult to reverse
![Page 8: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/8.jpg)
Physical changes
![Page 9: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/9.jpg)
Acids and alkalis
What do you remember from
year 7?
![Page 10: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/10.jpg)
Acid tastes
![Page 11: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/11.jpg)
Acid tastes
Acid comes from the latin word acer, which means sharp. Acids are sharp tasting! (“Tangy”)
![Page 12: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/12.jpg)
Indicators
Indicators are chemicals (coloured dyes) which change colour in acids and alkalis.
![Page 13: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/13.jpg)
Litmus
Turns red in acid
Turns blue in alkali
![Page 14: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/14.jpg)
Litmus
Turns red in acid
Turns blue in alkali
Litmus can tell us if something is an acid or an alkali, but it cannot tell us how strong the
acid or alkali is
![Page 15: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/15.jpg)
Other indicators
Red cabbage and beetroot make excellent indicators
![Page 16: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/16.jpg)
The pH scale
The strength of an acid is measured on the pH scale
pH stands for the “potential of hydrogen”
![Page 17: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/17.jpg)
Universal Indicator
To measure pH, we need an indicator that has a different colour for each value of pH
Universal Indicator
![Page 18: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/18.jpg)
Universal Indicator
It comes in the form of a paper
![Page 19: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/19.jpg)
Universal Indicator
It also comes in the form of a liquid
![Page 20: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/20.jpg)
Neutralisation
![Page 21: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/21.jpg)
Neutralisation
What happens when we add an acid to an alkali?
![Page 22: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/22.jpg)
Making a “salt” by neutralisation
• Can you stick the sheet in and read carefully?
![Page 23: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/23.jpg)
Hydrochloric acid + potassium hydroxide (alkali)
• Makes potassium chlorid (a “salt” + water
![Page 24: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/24.jpg)
Acid + Base “salt” + water
Hydrochloric acid + sodium hydoxide sodium chloride + water
Sulphuric acid + Potassium hydroxide Potassium sulphate + water
Nitric acid + ammonia ammonium nitrate + water
In general, hydrochloric acid makes a chloride, nitric acid makes a nitrate, and sulphuric acid makes a sulphate.
![Page 25: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/25.jpg)
Today’s lesson
• Writing word equations for making salts by neutralisation
• Making Copper sulphate
![Page 26: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/26.jpg)
Examples of neutralisation
![Page 27: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/27.jpg)
Word equations for making salts
• Can you stick the sheet in and answer the questions?
![Page 28: Do now! Whilst you are waiting can you answer some of the questions on the sheet?](https://reader036.vdocuments.mx/reader036/viewer/2022070414/5697c0071a28abf838cc6191/html5/thumbnails/28.jpg)
Making Copper sulphate