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

Какой тип связи образуется, когда атомы обобществляют электроны?

1. AИонная связь
2. BЯдерная связь
3. CКовалентная связь
4. DМеталлическая связь

В какой группе находятся благородные газы, например гелий и неон?

1. AВ группе 1
2. BВ группе 2
3. CВ группе 17
4. DВ группе 18

Which electrons take part in chemical bonding?

1. AAll electrons take part equally
2. BOnly the electrons in the first shell
3. CThe valence (outermost) electrons
4. DThe electrons closest to the nucleus

How can you get solid salt back from salt water?

1. AFreeze the solution and lift out the salt
2. BFilter the solution
3. CEvaporate the water
4. DUse a magnet

In a reaction at equilibrium, a product is continuously removed. What happens?

1. AThe equilibrium shifts to the left to form more reactants
2. BMore product keeps forming as the equilibrium shifts to the right
3. CThe reactants run out immediately
4. DThe reaction rate drops to zero

Radioactive iodine (iodine-131) is used to treat some thyroid conditions. Why does it reach the thyroid?

1. ARadiation is always drawn toward the head
2. BIodine-131 is not radioactive inside the body
3. CIodine is strongly attracted to the metal ions stored in the neck
4. DThe thyroid gland takes up iodine to make its hormones

Which element has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁵?

1. AArgon
2. BChlorine
3. CSulfur
4. DFluorine

In terms of bonds, why is a reaction exothermic?

1. AForming bonds always absorbs energy
2. BNo bonds are broken in exothermic reactions
3. CMore energy is released forming new bonds than is absorbed breaking old ones
4. DMore energy is absorbed breaking old bonds than is released forming new ones