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

According to the kinetic molecular theory, how do gas particles move?

1. AAlways in a single direction, set by the pull of gravity
2. BConstantly, randomly and in straight lines between collisions
3. COnly when heated, and then in neat lines between the walls
4. DSlowly in fixed positions

Which of these is a heterogeneous mixture?

1. ASugar dissolved in tea
2. BAir
3. CSalt dissolved in water
4. DOil and water

What is the molar mass of oxygen gas, O₂ (O = 16 g/mol)?

1. A48 g/mol
2. B32 g/mol
3. C8 g/mol
4. D16 g/mol

How does atomic radius change going down a group?

1. AIt decreases
2. BIt stays the same
3. CIt decreases, then increases
4. DIt increases

How should the volume of water in a graduated cylinder be read?

1. AAt eye level, from the bottom of the curved surface (meniscus)
2. BAt any angle, from the middle of the cylinder
3. CFrom above the cylinder, at the top edge of the curved surface
4. DFrom below, at the highest point the water touches the glass

Why must temperatures be in kelvin in gas law calculations?

1. ACelsius can only be used for liquids
2. BThe kelvin scale has smaller degrees, which gives more precise answers
3. CGas volume and pressure are proportional to the absolute temperature
4. DKelvin values are always below 100

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

1. AHigh temperature and large container
2. BLow pressure and low volume of particles
3. CHigh pressure and low temperature
4. DLow pressure and high temperature

Una reazione assorbe 50 kJ di energia dall'ambiente circostante. Quale affermazione è vera?

1. AÈ endotermica e i prodotti hanno meno energia dei reagenti
2. BÈ endotermica e i prodotti hanno più energia dei reagenti
3. CÈ esotermica e i prodotti hanno meno energia dei reagenti
4. DNon c'è stato alcun cambiamento di energia, perché l'energia si conserva