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

What does the double arrow (⇌) in a chemical equation show?

1. AThe reaction releases heat
2. BThe reaction is very fast
3. CThe reaction needs a catalyst
4. DThe reaction is reversible

Nella reazione AB → A + B, che tipo di reazione è rappresentata?

1. ASintesi
2. BDecomposizione
3. CDoppio scambio
4. DNeutralizzazione

Which group of biological molecules includes fats, oils and cholesterol?

1. ANucleic acids
2. BLipids
3. CProteins
4. DCarbohydrates

Why can a very high fever disrupt the body's chemical reactions?

1. AHigh temperatures turn enzymes into fats
2. BHigh temperatures make every enzyme work faster without any limit
3. CHigh temperatures can change the shape of enzymes so they stop working
4. DHigh temperatures remove the water from blood

A reaction has ΔH = −890 kJ/mol. What does the negative sign tell you?

1. AThe reaction needs a catalyst
2. BThe reaction is exothermic
3. CThe reaction is endothermic
4. DThe reaction is at equilibrium

Which assumption is made about an ideal gas?

1. AIts particles have no attraction to each other
2. BIts particles lose energy in every collision
3. CIts particles stay still at room temperature
4. DIts particles are large, closely packed and strongly attracted

La reazione 2SO₂ + O₂ ⇌ 2SO₃ raggiunge l'equilibrio. Che cosa è vero all'equilibrio?

1. ANel contenitore ci sono solo prodotti
2. BEntrambe le reazioni si sono fermate completamente
3. CLe concentrazioni di reagenti e prodotti devono essere uguali
4. DLa reazione diretta e quella inversa continuano a velocità uguali

In Rutherford's gold foil experiment, most alpha particles passed straight through the foil but a few bounced back. What did this show?

1. AElectrons move in fixed circular orbits
2. BAn atom is mostly empty space with a small, dense, positive nucleus
3. CElectrons are spread evenly through a positive "pudding"
4. DAtoms are solid, indivisible spheres