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

What is the change from a gas to a liquid called?

1. ASublimation
2. BFreezing
3. CCondensation
4. DEvaporation

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

1. A−32 °C (−26 °F)
2. B32 °C (90 °F)
3. C100 °C (212 °F)
4. D0 °C (32 °F)

Che cosa fa un catalizzatore?

1. AAccelera una reazione senza consumarsi
2. BFornisce i reagenti per una reazione
3. CCambia i prodotti di una reazione
4. DRallenta una reazione e si consuma

An exothermic reaction is at equilibrium. What happens if the temperature is raised?

1. AThe equilibrium shifts toward the reactants
2. BThe reaction becomes endothermic
3. CThe equilibrium shifts toward the products, raising the yield
4. DThe equilibrium does not change

Why does keeping food in a refrigerator slow down spoilage?

1. ACold air contains no oxygen
2. BLower temperatures slow down chemical and microbial reactions
3. CCold temperatures add preservatives to the food
4. DLower temperatures raise the activation energy of every reaction

Quale elemento è il più elettronegativo?

1. AIl ferro
2. BL'elio
3. CIl sodio
4. DIl fluoro

How much water must be added to 50 mL of a 10% solution to make a 2% solution?

1. A250 mL
2. B200 mL
3. C100 mL
4. D40 mL

Under which conditions does a real gas behave least like an ideal gas?

1. ALow pressure and low volume of particles
2. BHigh temperature and large container
3. CLow pressure and high temperature
4. DHigh pressure and low temperature