ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What causes the pressure of a gas in a container?

1. AGas particles sticking to the walls
2. BGas particles colliding with the container walls
3. CGas particles stopping and pushing outward
4. DThe weight of the container pressing on the gas inside

What is an electrolyte?

1. AA substance that dissolves as whole molecules without forming any ions
2. BA gas that dissolves in blood
3. CA metal that conducts electricity as a solid
4. DA substance that forms ions and conducts electricity when dissolved in water

Which quantity is the same for 1 mole of any substance?

1. AThe volume as a liquid
2. BThe mass in grams
3. CThe number of particles
4. DThe number of atoms per molecule

What is the conjugate base of nitric acid, HNO₃?

1. AH₂NO₃⁺
2. BNO₂⁻
3. CNO₃⁻
4. DHNO₂

Why does oxygen move from the alveoli of the lungs into the blood?

1. AThe partial pressure of oxygen is higher in the blood than in the alveoli
2. BThe partial pressure of oxygen is higher in the alveoli than in the blood
3. COxygen is pumped actively into the blood
4. DOxygen is heavier than carbon dioxide

A reaction is at equilibrium. More of one reactant is added. According to Le Chatelier's principle, what happens?

1. AThe equilibrium shifts toward the reactants
2. BThe reaction stops completely
3. CNothing changes
4. DThe equilibrium shifts toward the products

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 has a full outer shell like the noble gases
3. CIt always forms H⁺ ions and never shares electrons
4. DIt is an alkali metal that is solid at room temperature

A catalyst is added to an exothermic reaction. How does the energy diagram change?

1. AThe reaction becomes endothermic
2. BThe products end up at a lower energy, so more heat is released
3. CThe reactants start at a higher energy
4. DThe peak is lower, but the energy of reactants and products stays the same