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

Что из перечисленного является химическим изменением?

1. AТаяние льда
2. BРастворение сахара в чае
3. CРазбивание стекла
4. DГорение дерева

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

1. AOxygen
2. BHelium
3. CSodium
4. DIron

An instant cold pack feels cold when the substance inside dissolves. How is this dissolving process classified?

1. AA combustion reaction
2. BA neutralisation reaction
3. CExothermic
4. DEndothermic

Which property stays the same whether you have a small sample or a large sample of a pure substance?

1. AMass
2. BDensity
3. CTotal heat content
4. DVolume

Which of these is a colloid?

1. AMilk
2. BSalt water
3. CPure water
4. DSand in water

Что такое водородные связи?

1. AСвязи внутри ядра водорода
2. BПритяжение между водородом одной молекулы и атомом O, N или F другой
3. CИонные связи между ионами водорода и металлами
4. DКовалентные связи между двумя атомами водорода в H₂

Why is Dmitri Mendeleev's early periodic table regarded as such a success?

1. AHe arranged the elements by atomic number, which he had discovered
2. BHe discovered the noble gases and placed them in group 18
3. CHe left gaps and correctly predicted the properties of elements not yet discovered
4. DHe proved that the atoms of every element contain electrons

Equal masses of sand and water sit in the sun and absorb the same amount of heat. Which warms up more, and why?

1. AWater, because it has a higher specific heat capacity than sand
2. BBoth warm equally, because they absorbed the same heat
3. CSand, because it has a lower specific heat capacity than water
4. DSand, because it has a higher specific heat capacity than water