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G10 Physical Sciences 2025-01

G10 Physical Sciences 2025-01

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What will happen when an iron magnet is broken in two equal pieces?

The two pieces will repel each other because there are like poles on the inside.

You will have two smaller magnets, each with its own set of poles.

The magnet is broken and the poles disappear. You will have two pieces of unmagnetised iron.

You will have two smaller magnets. One will be a north pole and the other will be a south pole.

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The Earth has its own magnetic field. Which of the following statements is a consequence of this?

The Earth's magnetic field:

protects the Earth from meteorites.

❌

makes television broadcasts possible.

❌

results in colourful lights, the auroras at the equator.

❌

interacts with charged particles and causes the auroras at the north and south magnetic poles.

✅

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Magnetic fields run from the south to north outside the magnet.

Match the correct labels to the numbers in the below image :

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Which of the following statements about magnetic fields are ALWAYS true?

Magnetic field lines do cross.

The magnetic field of the Earth is stronger than the magnetic field of a bar magnet.

The larger the magnet, the stronger the field it produces.

Magnetic field lines are closest at the poles.

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In this type of reaction, the amount of energy released when new bonds are formed is greater than the amount of energy absorbed to break the old chemical bonds.

Synthesis reaction

❌

Decomposition reaction

Consider the following chemical reaction of the decomposition of calcium carbonate:

CaCO₃(s) → CaO(s) + CO₂(g)

If a 40 g sample of calcium carbonate (CaCO₃) completely decomposes to form 22,4 g of CaO.

Using the law of constant composition, calculate the mass of carbon dioxide (CO₂ formed after the complete decomposition of a different 30 g sample of calcium carbonate (CaCO₃).

In a sample of carbon dioxide (CO₂), there are 250 atoms of oxygen, how many carbon atoms are present in the sample?

Which Greek symbol is used in chemistry to refer to the energy of a chemical reaction?

Choose the correct unbalanced chemical equation that represents the chemical reaction between carbonic acid and sodium hydroxide to form sodium carbonate and water.

H₂O+Na₂CO₃ ⟶ NaOH + H₂CO₃

NaOH + H₂CO₃ ⟶ H₂O + Na₂CO₃

100%

H₂SO₄ + NaOH → NaSO₄+ H₂O

CH₄ + NaOH → CaCO₃ + H₂O

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