What do you know about acids? ACIDS

HW: Safety Poster Make a safety poster to display in the lab that describes how to stay safe during science experiments. It can be about one safety rule or as many as you want. Be creative! PLEASE PUT YOUR NAME IN THE TOP RIGHT CORNER.

Chemical Reactions L2 Properties of Acids and Alkalis Learning Objectives All students must be able to… Recognise some common hazard symbols and their uses Most students should be able to… Describe simply some properties of acids and alkalis Some students may be able to… Recall the names of common laboratory acids and alkalis.

Video: Acids and Bases Watch the video answer the following questions: What are acids? How are they different from bases (alkalis)?

Acids and Bases are Two Groups of Chemicals Chemicals can be dangerous. Scientists use hazard symbols to label chemicals. Answer the following questions. What is hazard symbol? Why is it important to use hazard symbols? Draw a hazard symbol you have seen before.

Can you figure out what these hazard symbols mean?

Complete the Worksheet Match up the correct hazard symbol with meaning.

Acids are Corrosive Corrosive means that it can wear away materials Acids can wear away metal and even cause chemical burns when reacting with you skin!

Acids in the Lab These are three common laboratory acids They are called strong acids and are very dangerous. How can we make laboratory acids safer to use? Diluting acids, adding water to them, makes them safer.

Alkalis Can also be Dangerous Alkalis can also burn skin and damage other materials. Alkalis are described as caustic. Just like acids, alkalis can be made safer by diluting.

Alkalis in the Lab These are two common laboratory alkalis. They are called strong alkalis and are very dangerous. Can you figure out how to tell from the name if it is an alkali?

Acids and alkalis are two groups of chemicals. Are all acids and alkalis dangerous? NO! Acids and alkalis are found in many things we use at home!

Acid or Alkali? Toothpaste Coca cola Orange juice Soap Vinegar Milk Water Baking Soda Chalk Alcohol

Acid Coca cola Orange juice Vinegar Milk Alkali Toothpaste Soap Baking Soda Chalk Water and Alcohol are neither!

Properties of Acids Strong acids are corrosive. Diluted acids or weak acids are irritants. React with stone and metal React with alkalis Sour taste

Properties of Alkalis Strong alkalis are caustic. Diluted alkalis or weak alkalis are irritants. React with acids Bitter taste Soapy feel VERY DANGEROUS! CAUSTIC!

Plenary Complete the worksheet “What acids and alkalis are like” When you finish, complete the extension “A chemical accident”