Cevaplı Hemşirelik giriş sınavları için kimya çalışma kâğıdı

What is activation energy?

1. AThe energy needed to melt a solid
2. BThe minimum energy reacting particles need for a reaction to happen
3. CThe total energy released once the reaction has finished
4. DThe energy stored in the products

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

1. AHydrogen ions (H⁺)
2. BSodium ions (Na⁺)
3. COxide ions (O²⁻)
4. DHydroxide ions (OH⁻)

Aşağıdakilerden hangisi fiziksel değişimdir?

1. ASütün ekşimesi
2. BSuyun kaynayıp buhara dönüşmesi
3. CEkmeğin kızarana kadar kızartılması
4. DDemirin paslanması

A reaction is at equilibrium. More of one reactant is added. According to Le Chatelier's principle, what happens?

1. AThe reaction stops completely
2. BThe equilibrium shifts toward the products
3. CThe equilibrium shifts toward the reactants
4. DNothing changes

Which assumption is made about an ideal gas?

1. AIts particles have no attraction to each other
2. BIts particles are large, closely packed and strongly attracted
3. CIts particles lose energy in every collision
4. DIts particles stay still at room temperature

How is 0,00045 written in scientific notation?

1. A4,5 × 10⁻³
2. B4,5 × 10⁴
3. C4,5 × 10⁻⁵
4. D4,5 × 10⁻⁴

Diamond is extremely hard and has a very high melting point. Which explanation is correct?

1. AIt is held together by ionic bonds between C⁺ and C⁻ ions
2. BIt contains delocalised electrons like a metal
3. CEach carbon is covalently bonded to four others in a giant network
4. DIt is made of separate small molecules with strong forces between them

Cotton soaked in ammonia (NH₃) and cotton soaked in hydrogen chloride (HCl) are placed at opposite ends of a glass tube. A white ring of ammonium chloride forms closer to the HCl end. What does this show?

1. ABoth gases diffuse at the same speed
2. BThe lighter NH₃ molecules diffuse faster than HCl molecules
3. CThe HCl molecules diffuse faster than NH₃ molecules
4. DThe white ring forms where the gases are heaviest