Chemia na egzaminy wstępne na pielęgniarstwo: karta pracy z odpowiedziami

What is an element?

1. AA physical mixture of different substances
2. BA substance made of only one kind of atom
3. CA substance of two or more elements chemically bonded together
4. DA particle with an electric charge

Atom ma 6 protonów, 6 neutronów i 6 elektronów. Jaka jest jego liczba masowa?

1. A12
2. B18
3. C6
4. D0

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

1. APressure and number of moles
2. BVolume and temperature
3. CPressure and volume
4. DDensity and mass

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

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

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

What feature makes a hydrocarbon an alkene?

1. AAn –OH group
2. BA ring of six carbon atoms with no hydrogen
3. CAt least one carbon–carbon double bond
4. DOnly carbon–carbon single bonds

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 gas inside the bag is heated strongly by the mountain sunlight
3. CThe bag becomes thinner and weaker at altitude
4. DMore gas is produced by the crisps at altitude

Why is incomplete combustion of fuel in a poorly ventilated room dangerous?

1. AIt produces carbon monoxide, which binds to haemoglobin and blocks oxygen transport
2. BIt produces water vapour, which is toxic
3. CIt produces nitrogen, which replaces oxygen in the blood
4. DIt produces extra oxygen, which damages the lining of the lungs over time