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

What is an alpha particle made of?

1. A2 protons and 2 neutrons
2. BPure electromagnetic energy
3. C1 proton and 1 electron
4. DA single high-energy electron

What is a single covalent bond?

1. AOne electron transferred from one atom to another
2. BTwo pairs of electrons shared between two atoms
3. COne pair of electrons shared between two atoms
4. DThe attraction between two oppositely charged ions

According to the Arrhenius definition, what does a base produce in water?

1. AHydrogen ions (H⁺)
2. BCarbonate ions (CO₃²⁻)
3. CHydroxide ions (OH⁻)
4. DChloride ions (Cl⁻)

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. CMolecules that contain the same number of bonds
4. DCompounds with the same molecular formula but different structures

A red blood cell is placed in pure water (a hypotonic solution). What happens?

1. AWater leaves the cell, which shrinks and wrinkles
2. BWater enters the cell, which swells and may burst
3. CNothing happens to the cell
4. DSalt enters the cell, which shrinks

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. B25%
3. C75%
4. D133%

У элемента электронная конфигурация 2, 8, 7. Какой ион он, скорее всего, образует?

1. AИон 1+
2. BИон 2−
3. CИон 1−
4. DИон 7+

What is a triglyceride made of?

1. AOne fatty acid joined to three glycerol molecules
2. BOne glycerol molecule joined to three fatty acids
3. CThree amino acids joined by peptide bonds
4. DThree glucose molecules joined together