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

What is the melting point of a substance?

1. AThe temperature at which its solid turns into a liquid
2. BThe temperature at which it dissolves in water
3. CThe temperature at which it catches fire
4. DThe temperature at which its liquid turns into a gas

Which of these is a chemical property?

1. AFlammability
2. BBoiling point
3. CColour
4. DDensity

Which quantity is the same for 1 mole of any substance?

1. AThe volume as a liquid
2. BThe mass in grams
3. CThe number of particles
4. DThe number of atoms per molecule

What are London dispersion forces?

1. AStrong bonds formed by transferring electrons
2. BAttractions between a hydrogen atom and a metal ion
3. CWeak, temporary attractions caused by shifting electrons in molecules
4. DForces that hold protons together in the nucleus

When mercury(II) oxide is heated, it reacts as 2HgO → 2Hg + O₂. What type of reaction is this?

1. ADecomposition
2. BSynthesis
3. CSingle replacement
4. DCombustion

Which bond joins amino acids together in a protein?

1. AA peptide bond
2. BA hydrogen bond
3. CA glycosidic bond
4. DAn ionic bond

Alkanes follow the general formula CₙH₂ₙ₊₂. What is the formula of the alkane with 4 carbon atoms?

1. AC₄H₈
2. BC₄H₁₀
3. CC₄H₆
4. DC₄H₁₂

Alpha radiation is stopped by skin, yet an alpha source is very dangerous if swallowed or inhaled. Why?

1. AStomach acid makes the alpha source more radioactive
2. BAlpha particles turn into much more penetrating gamma rays once inside the body
3. CAlpha particles are only produced at body temperature
4. DInside the body, alpha particles deposit all their energy in nearby living cells