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

pH của nước tinh khiết ở 25 °C là bao nhiêu?

1. A0
2. B7
3. C1
4. D14

What does the octet rule state?

1. AEvery stable molecule contains exactly 8 atoms
2. BAtoms tend to gain, lose or share electrons to get 8 outer electrons
3. CEvery stable atom has exactly 8 protons in its nucleus
4. DAn atom can form a maximum of 8 covalent bonds

According to the kinetic molecular theory, how do gas particles move?

1. AOnly when heated, and then in neat lines between the walls
2. BConstantly, randomly and in straight lines between collisions
3. CSlowly in fixed positions
4. DAlways in a single direction, set by the pull of gravity

Khối lượng riêng của một vật có khối lượng 50 g và thể tích 20 cm³ là bao nhiêu?

1. A2,5 g/cm³
2. B70 g/cm³
3. C1000 g/cm³
4. D0,4 g/cm³

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

When mercury(II) oxide is heated, it reacts as 2HgO → 2Hg + O₂. What type of reaction is this?

1. ASynthesis
2. BSingle replacement
3. CCombustion
4. DDecomposition

Starch and cellulose are both made entirely of glucose units, yet humans can digest starch but not cellulose. Why?

1. ACellulose dissolves in water, so it is lost from the gut
2. BCellulose is really made of amino acids, not glucose, so stomach acid cannot break it
3. CStarch contains nitrogen, which makes it easier to digest
4. DThe glucose units are linked differently, and humans lack an enzyme to break cellulose's links

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

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