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

Charles's law describes the relationship between which two properties of a gas, at constant pressure?

1. APressure and number of moles
2. BVolume and temperature
3. CPressure and volume
4. DDensity and mass

Which method separates two liquids with different boiling points, such as alcohol and water?

1. ADistillation
2. BSieving
3. CFiltration
4. DUsing a magnet

Where do the mole ratios used in stoichiometry come from?

1. AThe physical states of the substances
2. BThe subscripts in each formula
3. CThe coefficients of the balanced equation
4. DThe molar masses of the reactants

How many grams are in 2,5 kg?

1. A2500 g
2. B25 g
3. C250 g
4. D0,0025 g

Perché i gas nobili reagiscono raramente?

1. ASono tutti radioattivi
2. BI loro atomi sono molto più grandi degli altri atomi
3. CNon hanno affatto elettroni
4. DI loro gusci elettronici esterni sono già completi

Why does the vapour pressure of a liquid increase as it is heated?

1. AThe molecules become heavier and press harder on the surface
2. BMore molecules have enough energy to escape into the gas phase
3. CThe liquid's volume decreases and squeezes out vapour
4. DThe attractions between the molecules become stronger

Quale volume di una soluzione madre 6 M serve per preparare 300 mL di una soluzione 2 M?

1. A900 mL
2. B150 mL
3. C50 mL
4. D100 mL

A solution has a hydroxide ion concentration of 1 × 10⁻³ mol/L. What is its pH at 25 °C?

1. A7
2. B11
3. C3
4. D14