Cevaplı Hemşirelik giriş sınavları için kimya çalışma kâğıdı

About what percentage of dry air is oxygen?

1. A21%
2. B1%
3. C50%
4. D78%

Suyun kimyasal formülü nedir?

1. AOH
2. BHO₂
3. CH₂O
4. DH₂O₂

Which unit is commonly used for the density of a liquid?

1. Akg
2. Bg·mL
3. Cg/mL
4. DmL/g

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

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

A student tests how temperature affects the rate of a reaction. What is the independent variable?

1. AThe reaction rate
2. BThe temperature
3. CThe type of beaker used
4. DThe volume of acid, which is kept the same

A reaction has ΔH = −890 kJ/mol. What does the negative sign tell you?

1. AThe reaction is endothermic
2. BThe reaction needs a catalyst
3. CThe reaction is exothermic
4. DThe reaction is at equilibrium

What is (8 × 10⁶) ÷ (2 × 10⁻²)?

1. A16 × 10⁴
2. B4 × 10⁸
3. C4 × 10⁴
4. D4 × 10⁻¹²

A sealed bag of crisps (potato chips) packed at sea level looks puffed up when it is carried to a high mountain. Why?

1. AThe outside air pressure is lower, so the gas inside expands
2. BThe bag becomes thinner and weaker at altitude
3. CMore gas is produced by the crisps at altitude
4. DThe gas inside the bag is heated strongly by the mountain sunlight