Acids and Alkalis. 1. Acids are substances that: Examples of acids include. 1. Alkalis are substances that: Examples of alkalis include:

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Name: Acids and Alkalis CHP 4 WS 1 KS 3 Science: p.64 1.

Alkalis are substances that: Examples of alkalis include: Alkalis are frequently used for A

1 Name: Acids and Alkalis CHP 4 WS 1 KS 3 Science: p Acids are substances that: Examples of acids include 1. Alkalis are substances that: Examples of alkalis include: Alkalis are frequently used for A substance that is neither acidic nor alkaline is called. One example of such a substance is. The signs below are frequently found on both acids and alkalis. Label them:

2 Name: Reaction of Acids with Metals CHP 4 WS 2 KS 3 Science: n/a Follow the instructions to carry out the following reactions and test for the gas produced. Fill the table below with your results and observations. Instructions 1. Put the metal in the test tube 2. Add one pipette full of the acid 3. Light a wooden splint 4. Close the mouth of the test tube with a thumb until the pressure builds up a little 5. Put the lighted splint at the mouth of the test tube 6. If the gas burns with a pop, then it is hydrogen Results and Observations Acid Metal Gas bubbles observed? Burns with a pop? Conclusion When an acid is added to a metal gas is produced. Hydrogen is a gas with no, or. The test for hydrogen is that it.

3 Name: Indicators CHP 4 WS 3 KS 3 Science: p.68 Indicators are substances that An example of an indicator is which turns in acids and in alkalis. Check whether the substances you brought from home are acids or alkalis by putting one drop of each substance on litmus paper! Then place one pipette of the substance and add a few drops of tea to it and note the colour change! Is tea a good indicator? Substance Effect on blue litmus paper Effect on red litmus paper Effect on tea Acid or alkali? Hydrochloric acid Distilled water Sodium hydroxide

4 Name: The ph Scale CHP 4 WS 4 KS 3 Science: p.70 The ph scale shows how strong an acid or alkali is. It varies from a minimum of to a maximum of. A neutral substance has a ph of. Acidic substances have a ph that is than - the smaller the number is, the the acid is. Alkalis have a ph that is than - the larger the number is, the the alkali is. Add two drops of universal indicator to a small sample of each of the substances you brought from home. Compare the colour obtained to the colour chart for he universal indicator and find the ph of each substance. Repeat each test using the red-cabbage indicator and draw a ph chart for the red-cabbage indicator. Substance Colour of universal indicator ph Acid or alkali? Colour of redcabbage indicator Hydrochloric acid Distilled water Sodium hydroxide

Name: Neutralisation CHP 4 WS 5 KS 3 Science: p.74 What is a neutralisation reaction?

Why should you never treat acid spills, especially on the body, with an alkali?

Suggest, giving reasons, a value for the ph of milk of magnesia.

5 Name: Neutralisation CHP 4 WS 5 KS 3 Science: p.74 What is a neutralisation reaction? What should you do if you drop and acid or an alkali on yourself? Why should you never treat acid spills, especially on the body, with an alkali? Milk of magnesia is a medicine taken when a person has excess acid in his/her stomach. Suggest, giving reasons, a value for the ph of milk of magnesia. _ A bee or wasp sting can be treated with soapy water or baking soda. Do you think that the bee sting is acidic or alkaline? Why? Why does toothpaste has a ph of approximately 8?

Name: Acidic Gases CHP 4 WS 6A KS 3 Science: p.77 Aim: In this experiment we will test whether some of the gases produced by burning fuels are acidic, neutral or alkaline.

6 Name: Acidic Gases CHP 4 WS 6A KS 3 Science: p.77 Aim: In this experiment we will test whether some of the gases produced by burning fuels are acidic, neutral or alkaline. These will be dissolved in water and the ph of the solution formed tested. Diagram: Instructions 1. Measure 50cm 3 of water 2. Transfer the water into a gas jar 3. Add two drops of universal indicator to the water in the gas jar 4. Place some carbon in a combustion spoon 5. Light the Bunsen burner 6. Place the combustion spoon on the Bunsen burner until the carbon catches fire 7. Place the combustion spoon with burning carbon in the gas jar 8. Take note of the observations 9. Repeat the steps above using sulfur instead of carbon 10.The gas produced when carbon burns is called carbon dioxide 11.The gas produced when sulfur burns is called sulfur dioxide

When it dissolved in water, the universal indicator turned. This shows a ph value of. Therefore, sulfur dioxide is an gas.

7 Name: Acidic Gases CHP 4 WS 6B KS 3 Science: p.77 Observations and Results Carbon is a solid. It burns with a flame. The gas formed is. When it dissolved in water, the universal indicator turned. This shows a ph value of. Therefore, carbon dioxide is an gas. Sulfur is a solid. It burns with a flame. The gas formed is. When it dissolved in water, the universal indicator turned. This shows a ph value of. Therefore, sulfur dioxide is an gas. Carbon dioxide and sulfur dioxide gasses are both formed when fossil fuels such as and are burned. This is how objects that rely on fossil fuels such as and cause acid rain. Plants use carbon dioxide, along with and to produce their own energy, water and oxygen. This process is called.

Name: Acid Rain CHP 4 WS 7 KS 3 Science: p.

What does this show about the effects of acid rain on

8 Name: Acid Rain CHP 4 WS 7 KS 3 Science: p.77 What is acid rain and what causes it? What happens when a few drops of hydrochloric acid are added to limestone? What does this show about the effects of acid rain on buildings? How does acid rain effect the living environment? Give examples. What chemical can be used to treat acidic soil?

Iron filings (Fe) 56g IRON + SULPHUR IRON SULPHIDE

Iron filings (Fe) 56g IRON + SULPHUR IRON SULPHIDE W.S.51. Chemical reactions. All of the different materials around us have been formed by chemical reactions from about one hundred simple elements. The diagram below shows a chemical reaction between the