Chemia na egzaminy wstępne na pielęgniarstwo: karta pracy z odpowiedziami

Co powstaje, gdy kwas i zasada się zobojętniają?

1. AMocniejszy kwas
2. BTylko dwutlenek węgla
3. CSól i woda
4. DMetal i gazowy wodór

What is an electrolyte?

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

What is a solution?

1. AA pure compound made of two elements
2. BA mixture in which particles settle out on standing
3. CA mixture that is the same throughout (homogeneous)
4. DA solid that has been melted

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

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

How does evaporation differ from boiling?

1. AEvaporation happens only at the surface and at any temperature; boiling happens throughout the liquid at a set temperature
2. BEvaporation happens throughout the liquid at a set temperature; boiling happens only at the surface
3. CEvaporation produces a solid, while boiling produces a gas
4. DEvaporation needs a higher temperature than boiling

How many oxygen atoms are in one formula unit of calcium nitrate, Ca(NO₃)₂?

1. A2
2. B5
3. C3
4. D6

Using PV = nRT with R = 0,082 L·atm/(mol·K), how many moles of gas are in 24,6 L at 1 atm and 300 K?

1. A0,5 mol
2. B1 mol
3. C2 mol
4. D300 mol

In the fission reaction ²³⁵U + ¹n → ¹⁴¹Ba + ⁹²Kr + ? ¹n, how many neutrons are released?

1. A3
2. B1
3. C2
4. D4