| In your jotter write the DATE in the margin. Now add a TITLE for your homework. Your title should be the name of the Homework: Chemical Changes Homework Week 5 |
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| Question 1. | |
| Matthew wanted to find out which type of marble would produce 20ml of gas the fastest when added to sulphuric acid | |
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| The time taken to produce the quantity of gas is shown in the table below. | |
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| a) | Which type of marble would be the slowest to produce the 20ml of gas? |
| b) | Suggest the time that the flaked and lump chips would take to produce 20ml of gas |
| c) | If 4g of powdered marble was used instead of 2g, how long would the gas have taken to produce? |
| Question 2. | |
| What happens in all chemical reactions? | |
| Question 3. | |
| An enquiring scientist found three gas jars with sealed lids. He remembered they contained three different gases, but the labels had fallen off. | |
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| The gas in jar A relit a glowing splint. The gas in jar B put out a burning taper with a pop. The gas in jar C turned limewater milky. |
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| Identify the three gases, A, B and C. | |
| Question 4. | |
| A student set up four experiments to investigate the reaction between zinc and dilute hydrochloric acid. Which two experiments show how changing the particle size affects the speed of the reaction? | |
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| A | 1 and 2 |
| B | 2 and 3 |
| C | 3 and 4 |
| D | 4 and 1 |
| Question 5. | |
| What element is represented by the symbol Hg. Use the periodic table you have in your homework diary. (if you don’t have your diary find a periodic table on the internet) | |
| A | mercury |
| B | silver |
| C | hydrogen |
| D | helium |
