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

According to the Arrhenius definition, what does an acid produce in water?

1. AHydroxide ions (OH⁻)
2. BSodium ions (Na⁺)
3. CHydrogen ions (H⁺)
4. DOxide ions (O²⁻)

A blown-up balloon is put in a freezer. What happens to its volume?

1. AIt decreases
2. BIt increases
3. CIt stays exactly the same
4. DThe balloon bursts

Come si chiama una colonna verticale della tavola periodica?

1. AUn periodo
2. BUn gruppo
3. CUn guscio
4. DUna serie

Che cosa fa una soluzione tampone?

1. ATrasforma qualsiasi acido in una base forte
2. BMantiene costante la temperatura di una soluzione
3. CAccelera le reazioni di neutralizzazione in modo che il pH raggiunga subito esattamente 7
4. DResiste alle variazioni di pH quando si aggiunge un po' di acido o di base

What is nuclear fission?

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

In a closed container, 10 g of substance A reacts completely with 5 g of substance B. What is the total mass of the products?

1. A10 g
2. B5 g
3. C15 g
4. D50 g

Which substance has the lowest boiling point?

1. ASodium chloride
2. BHelium
3. CIron
4. DWater

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

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