Cevaplı Hemşirelik giriş sınavları için kimya çalışma kâğıdı

Which of these is a heterogeneous mixture?

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

How many moles of oxygen atoms are in 1 mole of carbon dioxide, CO₂?

1. A2
2. B0,5
3. C3
4. D1

According to collision theory, what must happen for particles to react?

1. AThey must stay completely still next to each other
2. BThey must collide with enough energy and the right orientation
3. CThey must have the same mass
4. DThey must both be in the solid state at the same time

During digestion, large molecules are broken down by adding water across their bonds. What is this reaction called?

1. ACondensation
2. BHydrolysis
3. CCombustion
4. DPolymerisation

What is the name of the molecular compound CO?

1. ACarbon dioxide
2. BMonocarbon oxide
3. CCarbon monoxide
4. DCarbon oxide

Water has a high specific heat capacity. How does this help the human body?

1. AIt makes water a poor solvent for salts
2. BIt allows oxygen to dissolve in water more easily
3. CIt helps keep body temperature stable
4. DIt makes the blood more acidic

Why does a burn from steam at 100 °C usually cause more damage than one from liquid water at 100 °C?

1. ASteam particles are hotter than water particles at the same reading
2. BSteam carries dissolved acid that damages the skin
3. CSteam releases a large amount of extra energy as it condenses on the skin
4. DLiquid water cannot pass any of its heat to the skin

In the reaction NH₃ + H₂O ⇌ NH₄⁺ + OH⁻, which substance acts as the Brønsted–Lowry acid?

1. AOH⁻
2. BNH₄⁺ only
3. CH₂O
4. DNH₃