解答つき看護学校入学試験のための化学ワークシート

What is the half-life of a radioactive isotope?

1. AHalf the time it takes for all the atoms to decay
2. BThe time taken for the mass of a sample to double in size
3. CHalf the number of protons in the nucleus
4. DThe time taken for half of the radioactive atoms in a sample to decay

Apart from mercury, which element is a liquid at room temperature?

1. AIodine
2. BBromine
3. CSodium
4. DChlorine

Which technique is used to separate the different coloured dyes in an ink?

1. AFiltration
2. BMagnetism
3. CChromatography
4. DDistillation of the ink

What colour is phenolphthalein indicator in a basic solution?

1. AYellow
2. BPink
3. CBlue
4. DColourless

In 2KClO₃ → 2KCl + 3O₂, how many moles of O₂ form from 4 mol of KClO₃?

1. A8 mol
2. B6 mol
3. C3 mol
4. D4 mol

吸熱過程を説明しているのはどれか。

1. A非常に高い温度でしか起こらない
2. B熱を吸収するため、周囲が冷たく感じられる
3. Cエネルギーを吸収も放出もしない
4. D熱を放出するため、周囲が温かく感じられる

Hydrogen is usually placed at the top of group 1. Which statement about hydrogen is correct?

1. AIt is an alkali metal that is solid at room temperature
2. BIt has one valence electron like group 1 metals, but it is a nonmetal gas
3. CIt always forms H⁺ ions and never shares electrons
4. DIt has a full outer shell like the noble gases

Diamond is extremely hard and has a very high melting point. Which explanation is correct?

1. AEach carbon is covalently bonded to four others in a giant network
2. BIt is made of separate small molecules with strong forces between them
3. CIt contains delocalised electrons like a metal
4. DIt is held together by ionic bonds between C⁺ and C⁻ ions