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Which acid is found in the stomach?

1. ASulfuric acid
2. BHydrochloric acid
3. CNitric acid
4. DAcetic acid

Boyle's law describes the relationship between which two properties of a gas, at constant temperature?

1. AVolume and temperature
2. BPressure and volume
3. CMass and volume
4. DPressure and temperature

What does the law of conservation of mass state?

1. AThe mass of products is always greater than the mass of reactants
2. BMass is neither created nor destroyed in a chemical reaction
3. CGases have no mass
4. DMass is lost as heat in every reaction

What does Avogadro's law state?

1. AThe pressure of a gas doubles when its temperature is halved
2. BEqual masses of all gases contain equal numbers of molecules under any conditions
3. COne mole of any gas has a mass of 22,4 g
4. DEqual volumes of gases at the same temperature and pressure contain equal numbers of molecules

Radioactive iodine (iodine-131) is used to treat some thyroid conditions. Why does it reach the thyroid?

1. AThe thyroid gland takes up iodine to make its hormones
2. BIodine-131 is not radioactive inside the body
3. CIodine is strongly attracted to the metal ions stored in the neck
4. DRadiation is always drawn toward the head

Apa itu ikatan hidrogen?

1. AIkatan kovalen antara dua atom hidrogen dalam H₂
2. BIkatan di dalam inti hidrogen
3. CTarikan antara hidrogen pada satu molekul dan atom O, N, atau F pada molekul lain
4. DIkatan ion antara ion hidrogen dan logam

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 releases the energy in many small, enzyme-controlled steps
4. DIt produces different products from burning

Sebuah balon berisi 2,0 L gas pada 300 K. Pada tekanan tetap, balon dipanaskan hingga 450 K. Berapa volume barunya?

1. A3,0 L
2. B2,0 L
3. C4,5 L
4. D1,3 L