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

Between which kinds of elements do ionic bonds usually form?

1. ATwo noble gases
2. BA metal and a nonmetal
3. CTwo identical metals
4. DTwo nonmetals

Where are the metalloids found on the periodic table?

1. AIn group 18, at the far right edge of the table
2. BIn group 1, at the far left edge of the table
3. CIn the two separate rows at the bottom of the table
4. DAlong the staircase line between the metals and the nonmetals

What is an acid–base indicator?

1. AA gas given off by acids
2. BA device that measures temperature
3. CA substance that neutralises every acid
4. DA substance that changes colour depending on pH

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

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

Как повышение температуры обычно влияет на скорость реакции?

1. AНе влияет на скорость
2. BПолностью останавливает реакцию
3. CУвеличивает скорость
4. DУменьшает скорость

In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which species loses electrons?

1. AZn²⁺
2. BCu
3. CZn
4. DCu²⁺

Element A has 1 valence electron and element B has 7 valence electrons, both in period 3. Which statement best compares them?

1. AA is a nonmetal and B is a metal
2. BBoth are metalloids
3. CA is a reactive metal and B is a reactive nonmetal
4. DBoth are unreactive because they are in the same period

Ammonia (NH₃) has three bonding pairs and one lone pair on nitrogen. What is its shape?

1. ATetrahedral
2. BFlat triangle (trigonal planar)
3. CLinear
4. DTrigonal pyramidal