Химия для вступительных экзаменов на сестринские программы: лист заданий с ответами

Что образуется, когда кислота и основание нейтрализуют друг друга?

1. AБолее сильная кислота
2. BМеталл и газообразный водород
3. CСоль и вода
4. DТолько углекислый газ

Which element exists naturally as diatomic molecules (two atoms joined together)?

1. AIron
2. BOxygen
3. CHelium
4. DSodium

What is oxidation, in terms of electrons?

1. ALoss of electrons
2. BLoss of protons
3. CGain of neutrons
4. DGain of electrons

How should the volume of water in a graduated cylinder be read?

1. AFrom below, at the highest point the water touches the glass
2. BAt any angle, from the middle of the cylinder
3. CAt eye level, from the bottom of the curved surface (meniscus)
4. DFrom above the cylinder, at the top edge of the curved surface

What feature makes a hydrocarbon an alkene?

1. AOnly carbon–carbon single bonds
2. BA ring of six carbon atoms with no hydrogen
3. CAn –OH group
4. DAt least one carbon–carbon double bond

What are isomers?

1. ACompounds with the same structure but different molecular formulas
2. BAtoms of the same element with different numbers of neutrons
3. CCompounds with the same molecular formula but different structures
4. DMolecules that contain the same number of bonds

A mixture contains sand, salt and water. Which sequence separates all three?

1. AEvaporate all the water first, then filter the salt away from the dry sand
2. BFilter to remove the sand, then distil the filtrate to collect water and leave salt
3. CDistil first to remove the sand, then filter out the salt
4. DUse a magnet to remove the salt, then filter the sand

Which 1-litre solution lowers the freezing point of water the most?

1. A1 M glucose
2. B1 M CaCl₂
3. C0,5 M NaCl
4. D1 M NaCl