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

Which property is typical of bases?

1. AThey turn blue litmus red
2. BThey feel slippery
3. CThey taste sour
4. DThey have a pH below 7

Đồng vị là gì?

1. ACác nguyên tử của cùng một nguyên tố có số proton khác nhau
2. BCác nguyên tử của cùng một nguyên tố có số neutron khác nhau
3. CCác nguyên tử của các nguyên tố khác nhau có cùng số neutron
4. DCác ion đã nhận thêm electron

Which acid is found in the stomach?

1. ANitric acid
2. BSulfuric acid
3. CAcetic acid
4. DHydrochloric acid

Water can act as an acid in some reactions and as a base in others. What is such a substance called?

1. ANeutral
2. BIsotonic
3. CSaturated
4. DAmphoteric

A gas mixture contains nitrogen at 600 mmHg, oxygen at 150 mmHg and other gases at 10 mmHg. What is the total pressure?

1. A253 mmHg
2. B750 mmHg
3. C600 mmHg
4. D760 mmHg

How does an antacid tablet relieve heartburn caused by excess stomach acid?

1. AIt coats the stomach and stops all acid production
2. BIt turns the acid into a gas that is absorbed
3. CAn acid in it lowers the stomach pH further
4. DA weak base in it neutralises some of the acid

Which list puts fluorine, chlorine and bromine in order of increasing electronegativity?

1. ABr < F < Cl
2. BBr < Cl < F
3. CCl < Br < F
4. DF < Cl < Br

Which statement correctly distinguishes a scientific law from a scientific theory?

1. AA law describes what happens; a theory explains why it happens
2. BA law is only a guess, while a theory is a proven fact
3. CA theory becomes a law once it is proved
4. DLaws apply only to chemistry, theories only to biology