护理入学考试化学练习卷（附答案）

What is the name of the polyatomic ion NH₄⁺?

1. ANitride
2. BAmmonia
3. CNitrate
4. DAmmonium

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

1. AOxygen
2. BNitrogen
3. CCarbon
4. DHydrogen

Where do the mole ratios used in stoichiometry come from?

1. AThe molar masses of the reactants
2. BThe coefficients of the balanced equation
3. CThe subscripts in each formula
4. DThe physical states of the substances

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

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

For the gas reaction N₂ + 3H₂ ⇌ 2NH₃, what is the effect of increasing the pressure?

1. AThere is no effect on the equilibrium
2. BThe equilibrium shifts to the left, toward N₂ and H₂
3. CThe equilibrium shifts to the right, toward NH₃
4. DThe NH₃ breaks down completely

What is the name of the molecular compound CO?

1. AMonocarbon oxide
2. BCarbon monoxide
3. CCarbon oxide
4. DCarbon dioxide

How does soap help remove grease from skin?

1. ASoap reacts with grease to form water and carbon dioxide
2. BSoap molecules are completely nonpolar, so they dissolve grease like a solvent
3. CSoap makes the grease more dense so it sinks
4. DEach soap molecule has a polar end that attracts water and a nonpolar end that attracts grease

A solution has a hydroxide ion concentration of 1 × 10⁻³ mol/L. What is its pH at 25 °C?

1. A3
2. B7
3. C14
4. D11