Phiếu bài tập Hóa học cho kỳ thi đầu vào điều dưỡng có đáp án

Sự chuyển trực tiếp từ thể rắn sang thể khí gọi là gì?

1. ASự ngưng tụ
2. BSự kết tủa từ pha khí (ngưng kết)
3. CSự nóng chảy
4. DSự thăng hoa

Which electrons take part in chemical bonding?

1. AOnly the electrons in the first shell
2. BThe valence (outermost) electrons
3. CThe electrons closest to the nucleus
4. DAll electrons take part equally

Chất nào là một base?

1. AHydrochloric acid (HCl)
2. BSodium hydroxide (NaOH)
3. CNước chanh (citric acid)
4. DGiấm (acetic acid)

Why does keeping food in a refrigerator slow down spoilage?

1. ALower temperatures raise the activation energy of every reaction
2. BCold temperatures add preservatives to the food
3. CLower temperatures slow down chemical and microbial reactions
4. DCold air contains no oxygen

Which bond joins amino acids together in a protein?

1. AA peptide bond
2. BAn ionic bond
3. CA glycosidic bond
4. DA hydrogen bond

Dung dịch có pH 3 so với dung dịch có pH 5 thì thế nào?

1. ACó số ion hydrogen bằng nhau
2. BCó nhiều ion hydrogen hơn 100 lần
3. CCó nhiều ion hydrogen hơn 2 lần
4. DCó ít ion hydrogen hơn 100 lần

Ethanol (CH₃CH₂OH) and dimethyl ether (CH₃OCH₃) have the same formula, C₂H₆O, but ethanol boils at a much higher temperature. Why?

1. AEthanol has more carbon atoms
2. BEthanol has an O–H group, so its molecules form hydrogen bonds with each other
3. CDimethyl ether is ionic and ethanol is covalent
4. DEthanol molecules are heavier than dimethyl ether molecules

In the Bohr model, what happens when an electron drops from a higher energy level to a lower one?

1. AEnergy is absorbed from the surroundings
2. BThe atom gains a proton
3. CEnergy is released, often as light
4. DThe electron leaves the atom