Chemia na egzaminy wstępne na pielęgniarstwo: karta pracy z odpowiedziami

What is a single covalent bond?

1. ATwo pairs of electrons shared between two atoms
2. BOne electron transferred from one atom to another
3. CThe attraction between two oppositely charged ions
4. DOne pair of electrons shared between two atoms

Which of these is a heterogeneous mixture?

1. ASugar dissolved in tea
2. BSalt dissolved in water
3. CAir
4. DOil and water

Roztwór ma pH równe 3. Jak go określamy?

1. AKwaśny
2. BObojętny
3. CNasycony
4. DZasadowy

Jaki jest wzór tlenku glinu, zbudowanego z jonów Al³⁺ i O²⁻?

1. AAlO
2. BAl₃O₂
3. CAlO₃
4. DAl₂O₃

What is the name of the molecular compound CO?

1. ACarbon oxide
2. BMonocarbon oxide
3. CCarbon dioxide
4. DCarbon monoxide

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

1. AWater enters the cell, which swells and may burst
2. BSalt enters the cell, which shrinks
3. CWater leaves the cell, which shrinks and wrinkles
4. DNothing happens to the cell

A small amount of acid is spilled on a lab bench. Why is a weak base such as sodium bicarbonate preferred over strong NaOH to neutralise it?

1. AExcess sodium bicarbonate is far less harmful than excess NaOH
2. BSodium bicarbonate is a strong acid that cancels the spill
3. CNaOH does not react with acids at room temperature
4. DSodium bicarbonate makes the spilled acid evaporate

Zmieszano równe objętości 1 M HCl i 1 M NaOH. Jakie jest w przybliżeniu pH wyniku?

1. A14
2. B7
3. C1
4. D3,5