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

Which element makes up the largest share of the human body by mass?

1. AOxygen
2. BHydrogen
3. CNitrogen
4. DCarbon

What does the rate of a reaction measure?

1. AHow much energy the final products contain
2. BHow quickly reactants are used up or products are formed
3. CHow hot the reaction gets
4. DHow much product forms in total by the end

Which form of sugar dissolves fastest in a cup of tea?

1. AAll forms dissolve at the same rate
2. BA sugar cube
3. CGranulated sugar
4. DA large lump of rock sugar

What is the name of the molecular compound CO?

1. ACarbon oxide
2. BMonocarbon oxide
3. CCarbon monoxide
4. DCarbon dioxide

Which halogen is the most reactive?

1. AFluorine
2. BIodine
3. CBromine
4. DChlorine

Nguyên tố nào có độ âm điện lớn nhất?

1. AHelium
2. BSodium
3. CFluorine
4. DSắt

Orange bromine water is shaken with two hydrocarbons. With hexene it turns colourless; with hexane it stays orange. What does this show?

1. AHexene is an alcohol and hexane is an acid
2. BBoth contain double bonds, but hexane reacts more slowly
3. CHexene contains a C=C double bond; hexane does not
4. DHexane contains a C=C double bond; hexene does not

A solution of acetic acid conducts electricity only weakly, while hydrochloric acid of the same concentration conducts strongly. Why?

1. AHydrochloric acid contains metal atoms
2. BAcetic acid does not dissolve in water at all
3. CAcetic acid only partly ionises, so it forms fewer ions
4. DAcetic acid forms more ions than hydrochloric acid does