ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is an element?

1. AA physical mixture of different substances
2. BA substance made of only one kind of atom
3. CA substance of two or more elements chemically bonded together
4. DA particle with an electric charge

What is the chemical formula of carbon dioxide?

1. ACO₃
2. BC₂O
3. CCO₂
4. DCO

Which property is typical of nonmetals?

1. AThey are shiny and easily bent into wires
2. BThey are poor conductors of heat and electricity
3. CThey easily lose electrons to form positive ions
4. DThey are all solids at room temperature

On an energy diagram, the products are at a lower energy than the reactants. What kind of reaction is shown?

1. AReversible only
2. BEndothermic
3. CNuclear
4. DExothermic

Which halogen is the most reactive?

1. ABromine
2. BChlorine
3. CIodine
4. DFluorine

When diluting a concentrated acid, which method is safe?

1. AAdd the acid slowly to the water
2. BAdd the water slowly to the acid
3. CMix them in any order, as long as it is fast
4. DAdd the water quickly to the acid

A student tests whether water temperature affects how fast sugar dissolves. Which set of factors should be kept the same in every trial?

1. ANothing, because changing several factors at once gives more useful data
2. BThe water temperature and the dissolving time
3. CThe mass of sugar, the type of sugar, the volume of water and the amount of stirring
4. DOnly the colour of the cup

Which phrase best describes a 0.001 M solution of hydrochloric acid?

1. AA concentrated solution of a weak acid
2. BA dilute solution of a weak acid
3. CA concentrated solution of a strong acid
4. DA dilute solution of a strong acid