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8E
Key Stage 3 Science
| Question | Answer |
|---|---|
| Name an organism that feeds on dead organisms or animal wastes causing them to decay. | Decomposers. |
| What does the law of conservation of mass state about the mass of the reactants and the mass of the products in a chemical reaction? | They are equal |
| List three properties of metals | Any three from Shiny, conducts heat, conducts electricity, malleable and flexible |
| What is the name of the compound formed when zinc atoms join to oxygen atoms? | Zinc oxide |
| What is the name of a chemical reaction where an element joins with oxygen? | Oxidation |
| What is the general name for a substance that is burnt to release energy | A fuel |
| What is the definition of a Hydrocarbon? | A compound formed from only Carbon and Hydrogen atoms |
| Describe the chemical test for carbon dioxide | Bubble the gas through limewater. If the limewater goes cloudy the gas is carbon dioxide |
| Describe the chemical test for water | Water turns anhydrous cobalt chloride paper from blue to pink |
| What is the name of a chemical reaction that gives out heat energy? | Exothermic |
| List the three sides of the fire triangle | Heat, fuel, oxygen |
| If 10g of MagnesIum is burnt in air to produce 16g of Magnesium Oxide what mass of oxygen must have joined to the magnesium ? | 6g |
| List three properties of non metal elements | Not shiny, does not conduct electricity, does not conduct heat |
| What is the name of the compound formed when carbon atoms join to oxygen atoms? | Carbon dioxide /Carbon Oxide |
| If copper metal is oxidised what compound is formed? | Copper Oxide |
| What is the general name for a substance that is burnt to release energy? | A fuel |
| What two gases cause acid rain? | Sulfur Dioxide and Nitrogen Oxide |
| Define "combustion" | A reaction with oxygen in which energy is transferred to the surroundings |
| What is the general equation for combustion? | Fuel + oxygen -> carbon dioxide + water |
| Define "conservation of mass" | Mass of reactants = mass of products |
| What are the devices that reduce the harmful gas produced by car exhausts? | Catalytic converter. |
| What is complete combustion of a fuel? | Combustion that produces only water and carbon dioxide |
| What is incomplete combustion of a fuel? | Combustion that produces a mixture of carbon dioxide, carbon monoxide, carbon and water and produces less energy |
| What causes incomplete combustion? | It occurs because there is not enough oxygen for all of the reactants to be fully oxidised. |
| What is soot? | Fine particles of carbon |
| What do we call changes that occur to the weather as a result of global warming? | Climate Change. |
| Name three greenhouse gases | carbon dioxide, water vapour methane |
| Why do greenhouse gases cause global warming? | They absorb energy emitted from the Earth’s surface and then emit it back to the surface. |
| Name three possible effects of climate change. | •Droughts, Famines, Sea Level Rise leading to flooding,Increased storms and hurricanes, Dangerous heat waves |
| Define "combustion" | A reaction with oxygen in which energy is transferred to the surroundings |
| What is the general equation for combustion? | Fuel + oxygen -> carbon dioxide + water |
| Define "conservation of mass" | Mass of reactants = mass of products |
| What is "combustion" more commonly known as? | Burning |
| Name three fossil fuels | Coal, oil, natural gas |
| Name 3 greenhouse gases | Water, carbon dioxide and methane |
| Describe 2 ways that humans are contributing to climate change | Burning fossil fuels and deforestation |
| Describe the greenhouse effect | Greenhouse gases prevent heat from escaping from the Earth into space |
Created by:
Davenant Foundation School
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