Cevaplı Hemşirelik giriş sınavları için kimya çalışma kâğıdı

Which process is exothermic (releases heat)?

1. ABurning methane gas
2. BPhotosynthesis
3. CEvaporating water
4. DMelting a block of ice

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

1. ADensity and mass
2. BVolume and temperature
3. CPressure and volume
4. DPressure and number of moles

What does the coefficient 3 in "3H₂O" mean?

1. AEach molecule of water contains three hydrogen atoms
2. BThere are three molecules (or moles) of water
3. CEach water molecule has three oxygen atoms
4. DWater has a charge of 3

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 makes the blood more acidic
4. DIt helps keep body temperature stable

A red blood cell is placed in a concentrated (hypertonic) salt solution. What happens?

1. AWater leaves the cell, which shrinks
2. BThe cell stays the same size and shape
3. CWater enters the cell, which swells and may burst
4. DSalt leaves the cell, which swells

A solution has a pH of 10. What is its pOH at 25 °C?

1. A4
2. B14
3. C24
4. D10

Pepsin digests protein in the stomach at about pH 2, but it stops working once food moves into the small intestine, where the pH is higher. Why?

1. APepsin is used up completely in the stomach, just like a reactant
2. BPepsin only works on fats in the small intestine
3. CThe change in pH alters the shape of pepsin's active site
4. DThe small intestine is too cold for any enzyme

A reaction should produce 2 mol of a product with a molar mass of 30 g/mol, but only 48 g is collected. What is the percent yield?

1. A125%
2. B48%
3. C80%
4. D60%