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

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

1. APressure and temperature
2. BPressure and volume
3. CMass and volume
4. DVolume and temperature

Яка властивість типова для металів?

1. AВони крихкі тверді речовини, що розколюються
2. BВони погано проводять тепло
3. CБільшість із них — гази за кімнатної температури
4. DВони добре проводять електричний струм

What is an empirical formula?

1. AThe mass of one mole of a compound
2. BThe actual number of each atom in one molecule
3. CA drawing of how the atoms are bonded
4. DThe simplest whole-number ratio of atoms in a compound

A reaction has a theoretical yield of 20 g, but only 15 g of product is collected. What is the percent yield?

1. A5%
2. B75%
3. C25%
4. D133%

Water climbs up a narrow glass tube. Which property mainly causes this?

1. ALow density of water
2. BEvaporation of water from the tube
3. CAdhesion of water to the glass
4. DWater's high boiling point

Nitrogen is in group 15 of the periodic table. How many valence electrons does a nitrogen atom have?

1. A3
2. B15
3. C5
4. D7

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 extra oxygen, which damages the lining of the lungs over time
3. CIt produces nitrogen, which replaces oxygen in the blood
4. DIt produces water vapour, which is toxic

The true volume in a flask is 10,0 mL. A student measures it three times and gets 8,1 mL, 8,1 mL and 8,2 mL. How are these results best described?

1. ANeither accurate nor precise
2. BPrecise but not accurate
3. CBoth accurate and precise
4. DAccurate but not precise