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

What does the double arrow (⇌) in a chemical equation show?

1. AThe reaction is reversible
2. BThe reaction is very fast
3. CThe reaction releases heat
4. DThe reaction needs a catalyst

In a chemical reaction, what is the limiting reactant?

1. AThe catalyst that controls the speed
2. BThe reactant with the largest mass
3. CThe reactant that is left over at the end
4. DThe reactant that runs out first and stops the reaction

What is an unsaturated solution?

1. AA solution with no solute at all
2. BA solution with undissolved solid at the bottom
3. CA solution that holds the maximum possible solute
4. DA solution that can still dissolve more solute

How does a mixture of iron filings and sulfur powder differ from the compound iron sulfide?

1. AThe mixture has a fixed ratio of iron to sulfur
2. BThe mixture is formed by a chemical reaction between the two elements
3. CThe compound keeps the magnetic properties of iron
4. DThe mixture can be separated physically, for example with a magnet

What is the name of the molecular compound CO?

1. AMonocarbon oxide
2. BCarbon monoxide
3. CCarbon oxide
4. DCarbon dioxide

What is a polymer?

1. AA mixture of several different elements
2. BAn ion with more than one charge
3. CA large molecule built from many repeating smaller units called monomers
4. DA small molecule containing only two atoms of one element

What is the formula of iron(III) chloride?

1. AFeCl₂
2. BFe₂Cl₃
3. CFeCl₃
4. DFe₃Cl

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

1. AFluorine
2. BChlorine
3. CArgon
4. DSulfur