Chemia na egzaminy wstępne na pielęgniarstwo: karta pracy z odpowiedziami

What is the smallest particle of an element that still has the chemical properties of that element?

1. AAn atom
2. BAn electron
3. CA proton
4. DA nucleus

Which of these is a heterogeneous mixture?

1. ASalt dissolved in water
2. BOil and water
3. CSugar dissolved in tea
4. DAir

What do the letters STP stand for in gas chemistry?

1. AStable temperature point
2. BSpecific temperature and particles
3. CStandard temperature and pressure
4. DStandard time and pressure

What is nuclear fission?

1. AThe splitting of a heavy nucleus into smaller nuclei
2. BThe joining of two light nuclei to form a heavier nucleus
3. CThe loss of electrons from an atom
4. DThe burning of uranium in oxygen

How does an antacid tablet relieve heartburn caused by excess stomach acid?

1. AAn acid in it lowers the stomach pH further
2. BIt coats the stomach and stops all acid production
3. CIt turns the acid into a gas that is absorbed
4. DA weak base in it neutralises some of the acid

How does a mixture of iron filings and sulfur powder differ from the compound iron sulfide?

1. AThe mixture is formed by a chemical reaction between the two elements
2. BThe mixture has a fixed ratio of iron to sulfur
3. CThe compound keeps the magnetic properties of iron
4. DThe mixture can be separated physically, for example with a magnet

Która z poniższych jest reakcją zobojętniania?

1. AZn + CuSO₄ → ZnSO₄ + Cu
2. BH₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
3. CCH₄ + 2O₂ → CO₂ + 2H₂O
4. D2H₂O → 2H₂ + O₂

Which statement correctly distinguishes a scientific law from a scientific theory?

1. ALaws apply only to chemistry, theories only to biology
2. BA law describes what happens; a theory explains why it happens
3. CA theory becomes a law once it is proved
4. DA law is only a guess, while a theory is a proven fact