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KS3 chem questions
Common Entrance (KS3) chemistry questions
| Question | Answer |
|---|---|
| What is the approximate percentage of oxygen in the atmosphere? | 21% |
| What percentage of the air is nitrogen? | 78% |
| Approximately how many elements are there? | about 100 |
| What kind of liquid has a pH value less than pH7. | ACID |
| Is a solution of magnesium oxide acidic, alkaline or neutral? | ALKALINE |
| A very light metal used to make kitchen foil and saucepans. A good conductor of heat and electricity. | ALUMINIUM |
| To show if a liquid contains water you could add it to what blue chemical? | ANHYDROUS COBALT CHLORIDE |
| Name the solid formed formed when blue copper sulphate decomposes: | ANHYDROUS COPPER SULPHATE |
| What name is given to the smallest part of an element? | ATOM |
| What colour does copper turn when it is heated? | BLACK |
| A piece of apparatus that burns gas and is used to heat apparatus. | BUNSEN BURNER |
| Ca is the symbol for which chemical element? | CALCIUM |
| What is the main compound present in limestone? | CALCIUM CARBONATE |
| Name a non-metallic element that conducts electricity | CARBON |
| What gas would be formed when carbon reacts with magnesium oxide? | CARBON DIOXIDE |
| Name TWO substances released into the air when a candle burns. | CARBON DIOXIDE and WATER |
| A way of separating a mixture of coloured dyes or pigments such as found in ink. | CHROMATOGRAPHY |
| Is water a mixture, compound or element? | COMPOUND |
| This is what happens when a gas turns to a liquid due to being cooled down. For example when steam touches a cold mirror. | CONDENSE (condensation) |
| What solid product be formed if carbon was heated strongly with copper oxide. | COPPER |
| What compound is formed when copper is heated in air? | COPPER OXIDE |
| What kind of reaction takes place when calcium carbonate is heated strongly to form lime? | DECOMPOSITION |
| What process of separation would you use to obtain fresh water from salty water (filtration, distillation or evaporation)? | DISTILLATION |
| Is carbon a mixture, compound or element | ELEMENT |
| What process of separation would you use to obtain salt from salty water (filtration, distillation or evaporation)? | EVAPORATION |
| The liquid left behind after filtering. | FILTRATE |
| What process of separation would you use to remove sand from salty water (filtration, distillation or evaporation)? | FILTRATION |
| A substance has a melting point of -218°C and a boiling point of -183°C. Is it a solid liquid or gas? | GAS |
| If copper sulphate were heated would it’s mass gain, get less or not change? | GET LESS |
| Name a dense, yellow metal that is often used to make jewellery. | GOLD |
| A form of carbon. The black substance inside pencils (the pencil lead). | GRAPHITE |
| What is the chemical formula for water? | H2O |
| Which gas burns with a squeeky 'pop' | HYDROGEN |
| Two liquids that will not mix together (like oil and water) | IMMISCIBLE |
| If some copper foil were heated strongly in air would it’s mass increase, decrease or not change? | INCREASE |
| Pick an alkaline substance from: lemon juice, indigestion mixture, water, vinegar | INDIGESTION MIXTURE |
| When a substance cannot dissolve. | INSOLUBLE |
| In a common industrial process, carbon is heated with iron oxide. What everyday substance is being produced? | IRON |
| What substance is used during the test for carbon dioxide gas | LIMEWATER |
| A substance has a melting point of -39°C and a boiling point of 357°C. Is it a solid liquid or gas? | LIQUID |
| Name an element that burns with a bright white flame | MAGNESIUM |
| Pick out an alkaline oxide from the list below: A: sulphur dioxide, B: sodium chloride, C: magnesium oxide | MAGNESIUM OXIDE |
| A substance that can be hammered into thin sheets. Includes most metals. Good examples are gold, copper or lead. | MALLEABLE |
| CH4 is the formula for which gas? | METHANE |
| Is air a mixture, compound or element? | MIXTURE |
| The particle formed when two or more atoms chemically join together. | MOLECULE . |
| What kind of liIs the oxide of hydrogen acidic, alkaline or neutral? | NEUTRAL |
| What do we call the reaction between sodium hydroxide and hydrochloric acid. | NEUTRALIZATION |
| Name the most abundant gas in the atmosphere | NITROGEN |
| What would happen to a piece of copper if it were heated gently in a tube of nitrogen gas? | NOTHING |
| What gas will relight a glowing splint? | OXYGEN |
| What is the pH value of pure water? | Ph 7 |
| A scale of numbers (from 1 to 14)which shows how acidic or alkaline a liquid is. | pH SCALE |
| What colour does anhydrous cobalt chloride turn when added to water? | PINK |
| What colour would universal indicator turn when added to oven cleaner (a strong alkali)? | PURPLE |
| If Litmus indicator was added to a liquid of pH 5 what colour would it go? | RED |
| The kind of reaction happens when we remove the oxygen from a compound. | REDUCE (reduction) |
| A substance good at removing oxygen from a compound. (Eg magnesium) | REDUCING AGENT |
| The solid remaining in the filter paper after filtering. | RESIDUE |
| What common name is given to the chemical called sodium chloride? | SALT |
| What solid chemical is formed when iron is added to siver nitrate solution | SILVER |
| Which element has the symbol Na? | SODIUM |
| What is the chemical name for the substance we call table salt? | SODIUM CHLORIDE |
| Name the two products formed when sodium hydroxide reacts with hydrochloric acid | SODIUM CHLORIDE AND WATER |
| A substance has a melting point of 113°C and a boiling point of 445°C. Is it a solid liquid or gas? | SOLID |
| This is how we describe a substance that can be dissolved | SOLUBLE |
| If some salt is dissolved in warm water the salt is called the A: solution, B: solute, C: solvent ? | SOLUTE |
| This is the liquid obtained by dissolving one substance in another. | SOLUTION |
| SOLID, LIQUID and GAS are known as this. | STATES OF MATTER |
| Name a yellow element that burns to form an acidic oxide | SULPHUR |
| Name a compound of sulphur that causes acid rain | SULPHUR DIOXIDE |
| Flour is insoluble in water. When flour is shaken with water it will form a A: solution B: suspension C: filtrate | SUSPENSION |
| What colour change would you see if water was added to anhydrous copper sulphate | Turn BLUE |
| Pick a substance with a pH value less than Ph7: vinegar, water, limewater | VINEGAR |
| Pick a neutral oxide from this list: Magnesium oxide, water, sulphur dioxide, carbon dioxide | WATER |
| What colour is magnesium oxide | WHITE |
| What colour is sulphur? | YELLOW |
Created by:
MikeCurtis
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