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Sebuah atom netral memiliki 11 proton. Berapa elektron yang dimilikinya?

1. A22
2. B11
3. C12
4. D10

Pada reaksi AB → A + B, jenis reaksi apa yang ditunjukkan?

1. ASintesis
2. BPenguraian
3. CPenggantian ganda
4. DPenetralan

In a chemical equation, what are the reactants?

1. AThe catalysts written above the arrow
2. BThe new substances formed, written to the right of the arrow
3. CThe starting substances, written to the left of the arrow
4. DThe numbers written in front of each formula

For the gas reaction N₂ + 3H₂ ⇌ 2NH₃, what is the effect of increasing the pressure?

1. AThe equilibrium shifts to the right, toward NH₃
2. BThere is no effect on the equilibrium
3. CThe NH₃ breaks down completely
4. DThe equilibrium shifts to the left, toward N₂ and H₂

How much heat is needed to raise the temperature of 100 g of water by 10 °C (specific heat of water = 4,18 J/g·°C)?

1. A418 J
2. B41,8 J
3. C4180 J
4. D41,800 J

How can you get solid salt back from salt water?

1. AFilter the solution
2. BEvaporate the water
3. CFreeze the solution and lift out the salt
4. DUse a magnet

Cells oxidise glucose to CO₂ and water, as burning glucose does. How does cellular respiration differ from burning?

1. AIt does not need oxygen at any stage
2. BIt releases much more total energy than burning the same glucose
3. CIt produces different products from burning
4. DIt releases the energy in many small, enzyme-controlled steps

Which approach best reduces a health worker's exposure to ionising radiation?

1. AStand closer to the source so the job is finished sooner and exposure is shorter
2. BRely only on wearing gloves
3. CLimit the time near the source, increase the distance and use shielding
4. DWork faster without any shielding