Scheda di esercizi di Chimica per i test di ammissione a infermieristica con soluzioni

At sea level, at what temperature does pure water freeze?

1. A100 °C (212 °F)
2. B32 °C (90 °F)
3. C0 °C (32 °F)
4. D−32 °C (−26 °F)

What does the law of conservation of mass state?

1. AGases have no mass
2. BThe mass of products is always greater than the mass of reactants
3. CMass is neither created nor destroyed in a chemical reaction
4. DMass is lost as heat in every reaction

Quale particella ha una massa quasi trascurabile rispetto alle altre in un atomo?

1. AIl neutrone
2. BIl nucleo nel suo insieme
3. CL'elettrone
4. DIl protone

Which property stays the same whether you have a small sample or a large sample of a pure substance?

1. AVolume
2. BTotal heat content
3. CMass
4. DDensity

Quale affermazione descrive un acido forte?

1. AHa un pH superiore a 7
2. BSi ionizza completamente in acqua
3. CLibera ioni idrogeno solo in parte
4. DÈ sempre molto concentrato

In the ideal gas law, PV = nRT, what does n stand for?

1. AThe density of the gas
2. BThe number of molecules of gas
3. CThe number of moles of gas
4. DThe number of atoms per molecule

What is the net ionic equation for the neutralisation of any strong acid by any strong base?

1. AH⁺ + OH⁻ → H₂O
2. BH₂ + O₂ → H₂O₂
3. CH⁺ + Cl⁻ → HCl
4. DNa⁺ + Cl⁻ → NaCl

How many grams of NaCl are in 250 mL of 0,9% (w/v) normal saline?

1. A9 g
2. B2,25 g
3. C22,5 g
4. D0,9 g