ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is an empirical formula?

1. AThe actual number of each atom in one molecule
2. BThe simplest whole-number ratio of atoms in a compound
3. CThe mass of one mole of a compound
4. DA drawing of how the atoms are bonded

What is a cation?

1. AA negatively charged ion
2. BA positively charged ion
3. CA molecule with no charge
4. DA neutral atom

An instant cold pack feels cold when the substance inside dissolves. How is this dissolving process classified?

1. AA combustion reaction
2. BA neutralisation reaction
3. CEndothermic
4. DExothermic

Drops of water form on the outside of a glass of ice water. Where does this water come from?

1. AWater leaks through tiny holes in the glass
2. BThe ice evaporates through the glass
3. CWater vapour in the air condenses on the cold glass
4. DThe glass releases water when it gets cold

According to the Brønsted–Lowry definition, what is an acid?

1. AAn electron pair donor
2. BA hydroxide ion donor
3. CA proton (H⁺) donor
4. DA proton (H⁺) acceptor

In a reaction at equilibrium, a product is continuously removed. What happens?

1. AMore product keeps forming as the equilibrium shifts to the right
2. BThe equilibrium shifts to the left to form more reactants
3. CThe reaction rate drops to zero
4. DThe reactants run out immediately

Hydrogen peroxide fizzes when poured on a cut because an enzyme in blood breaks it down. What gas is produced, and what type of reaction is it?

1. AOxygen, in a decomposition reaction
2. BHydrogen, in a single replacement reaction
3. CCarbon dioxide, in a combustion reaction
4. DChlorine, in a synthesis reaction

What is a triglyceride made of?

1. AOne fatty acid joined to three glycerol molecules
2. BThree glucose molecules joined together
3. CThree amino acids joined by peptide bonds
4. DOne glycerol molecule joined to three fatty acids