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What is the mass of 1 mole of nitrogen atoms?
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What is the mass of 4 moles of aluminium atoms (Atomic mass of aluminium = 27)?
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What is the mass of 10 moles of sodium sulphite (Na2SO3)?
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Convert into mole.
12 g of oxygen gas
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Convert into mole.
20 g of water
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Convert into mole.
22 g of carbon dioxide
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What is the mass of 0.2 mole of oxygen atoms?
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What is the mass of 0.5 mole of water molecules?
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Why are lysosomes known as suicide bags?
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Write down two main functions of Lysosome.
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"Lysosomes are known as suicide bags". Why?
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Two chemical substances X and Y combine together to form a product P which contains both X and Y X + Y P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct ?
- P is a compound
- X and Y are compounds
- X and Y are elements
- P has a fixed composition
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State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
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Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
- Digestion of food
- Melting of ice
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Classify the following as physical or chemical change :
Formation of curd from milk
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Classify the following as physical or chemical change :
Condensation of steam
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Classify the following as physical or chemical change :
Growth of a plant
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Classify the following as physical or chemical changes :
Breaking of a glass tumbler
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Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
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Which of the following are physical changes and which are chemical changes?
Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.
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