Робочий аркуш «Хімія для вступних іспитів на медсестринство» з відповідями

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

1. AVolume and temperature
2. BDensity and mass
3. CPressure and volume
4. DPressure and number of moles

Which state of matter has a fixed volume but takes the shape of its container?

1. APlasma
2. BLiquid
3. CSolid
4. DGas

What is the chemical formula of carbon dioxide?

1. ACO₂
2. BCO
3. CC₂O
4. DCO₃

What is the oxidation number of oxygen in most of its compounds?

1. A−1
2. B−2
3. C0
4. D+2

When the diaphragm contracts and the chest cavity gets bigger, what happens to the air pressure inside the lungs?

1. AIt rises, so air flows in
2. BIt falls, so air flows out
3. CIt does not change
4. DIt falls, so air flows in

Що вимірює температура згідно з кінетичною молекулярною теорією?

1. AСередню кінетичну енергію частинок
2. BМасу кожної частинки
3. CЗагальну кількість частинок
4. DРозмір контейнера

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

Olive oil is liquid at room temperature, while butter is solid. Which explanation is correct?

1. AOlive oil molecules are ionic, while butter molecules are covalent
2. BButter contains more water, which freezes at room temperature
3. COlive oil has more C=C double bonds, which kink the chains so they cannot pack closely
4. DOlive oil has no C=C double bonds, so its chains stay straight and pack tightly