Chemia na egzaminy wstępne na pielęgniarstwo: karta pracy z odpowiedziami

What is an element?

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

What is osmosis?

1. AThe movement of solute particles against a gradient using energy
2. BThe breaking of a solid into ions
3. CThe dissolving of a gas in a liquid
4. DThe movement of water across a semipermeable membrane

What is the melting point of a substance?

1. AThe temperature at which it dissolves in water
2. BThe temperature at which its liquid turns into a gas
3. CThe temperature at which it catches fire
4. DThe temperature at which its solid turns into a liquid

Co dzieje się z temperaturą wody z lodem, gdy lód topnieje?

1. AOd razu rośnie do 100 °C
2. BSpada poniżej 0 °C
3. CCały czas stale rośnie
4. DPozostaje równa 0 °C, dopóki cały lód się nie stopi

Magnesium forms Mg²⁺ ions and oxygen forms O²⁻ ions. What is the formula of magnesium oxide?

1. AMg₂O₂
2. BMgO
3. CMg₂O
4. DMgO₂

A red blood cell is placed in pure water (a hypotonic solution). What happens?

1. ASalt enters the cell, which shrinks
2. BNothing happens to the cell
3. CWater enters the cell, which swells and may burst
4. DWater leaves the cell, which shrinks and wrinkles

Zmieszano 2 mol H₂ i 2 mol O₂, które reagują według równania 2H₂ + O₂ → 2H₂O. Który substrat jest ograniczający?

1. AWoda, bo jest produktem
2. BTlen, bo tlenu jest mniej niż wodoru
3. CWodór, bo 2 mol H₂ zużywają tylko 1 mol O₂
4. DŻaden, bo ilości są równe

A salt is dissolved in water in an insulated cup, and the water temperature falls from 25 °C to 20 °C. Which statement is correct?

1. ANo energy change occurred, because the temperature fell
2. BDissolving is endothermic; the water took heat from the salt
3. CDissolving is endothermic; the dissolving salt took heat from the water
4. DDissolving is exothermic; the dissolving salt released heat into the water