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G10 Physical Sciences 2025-01

G10 Physical Sciences 2025-01

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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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We know that the opposite poles of magnets are attracted to each other. The red needle of a compass always points to:

Both magnetic and geographic north as the one is essentially right next to the other.

❌

Magnetic south because the north pole of the compass must point to south.

❌

Magnetic north, although this is actually the south pole of the Earth’s magnetic field.

✅

Geographic north because magnetic north would repel the north pole of the compass.

❌

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

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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

8 grams of hydrogen reacts with some oxygen to make 72 grams of water. How much oxygen must have been used by applying the law of conservation of mass?

16 g

100%

80 g

32 g

64 g

100%

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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).

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