护理入学考试化学练习卷（附答案）

What is an unsaturated solution?

1. AA solution with undissolved solid at the bottom
2. BA solution with no solute at all
3. CA solution that holds the maximum possible solute
4. DA solution that can still dissolve more solute

What is the SI unit of temperature?

1. AJoule
2. BKelvin
3. CDegree Celsius
4. DDegree Fahrenheit

配平的化学方程式表明什么？

1. A箭头两边反应前后的分子数相同
2. B只有反应的反应物
3. C产物比反应物多
4. D两边每种原子的数目相同

The amino acid glycine has an –NH₂ group and a –COOH group. What are these two groups called?

1. AA phosphate group and a hydroxyl group
2. BAn amino group and a carboxyl group
3. CA carbonyl group and an ester group
4. DA hydroxyl group and a methyl group

A student tests how temperature affects the rate of a reaction. What is the independent variable?

1. AThe type of beaker used
2. BThe reaction rate
3. CThe temperature
4. DThe volume of acid, which is kept the same

A plastic block has a density of 0.8 g/cm³. What happens when it is placed in water (density 1.0 g/cm³)?

1. AIt dissolves
2. BIt stays suspended halfway down
3. CIt floats
4. DIt sinks

Sugar is heated in a pan. Which observation shows that a chemical change, not just a physical change, has happened?

1. AThe crystals become smaller when crushed
2. BIt gets hot to the touch
3. CIt turns black and gives off water vapour, leaving a solid that is no longer sweet
4. DIt melts into a clear, runny liquid that sets again when it cools

Hydrogen is usually placed at the top of group 1. Which statement about hydrogen is correct?

1. AIt has one valence electron like group 1 metals, but it is a nonmetal gas
2. BIt is an alkali metal that is solid at room temperature
3. CIt has a full outer shell like the noble gases
4. DIt always forms H⁺ ions and never shares electrons