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

Quale particella ha una massa quasi trascurabile rispetto alle altre in un atomo?

1. AIl nucleo nel suo insieme
2. BL'elettrone
3. CIl neutrone
4. DIl protone

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

1. ASintesi
2. BDoppio scambio
3. CDecomposizione
4. DNeutralizzazione

A cleaning solution has a pH of 12. How is it described?

1. AStrongly basic
2. BWeakly acidic
3. CNeutral
4. DStrongly acidic

Magnesium forms Mg²⁺ ions and oxygen forms O²⁻ ions. What is the formula of magnesium oxide?

1. AMgO₂
2. BMg₂O₂
3. CMgO
4. DMg₂O

Which is larger, a sodium atom (Na) or a sodium ion (Na⁺)?

1. AThe sodium ion
2. BThe sodium atom
3. CThey are the same size
4. DIt depends on the temperature

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

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

Why does a sodium ion (Na⁺) have almost the same mass as a sodium atom?

1. AThe only difference is one electron, which has a tiny mass
2. BIons and atoms always have exactly the same mass
3. CThe ion has one fewer proton, which has a tiny mass
4. DThe ion gains a neutron that balances the loss

At room temperature chlorine (Cl₂) is a gas, bromine (Br₂) is a liquid and iodine (I₂) is a solid. What best explains this trend?

1. AChlorine is ionic, while iodine is metallic
2. BIodine forms hydrogen bonds but chlorine does not
3. CLarger molecules with more electrons have stronger dispersion forces
4. DThe covalent bond in I₂ is much stronger than in Cl₂