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

Which property is typical of bases?

1. AThey feel slippery
2. BThey taste sour
3. CThey have a pH below 7
4. DThey turn blue litmus red

Where are the metalloids found on the periodic table?

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

What is a horizontal row of the periodic table called?

1. AA period
2. BA family
3. CA group
4. DA block

Why is a carbon dioxide extinguisher effective on many fires?

1. ACO₂ reacts chemically with the fuel to make it non-flammable
2. BCO₂ adds oxygen to cool the flames
3. CCO₂ is denser than air and pushes oxygen away from the fire
4. DCO₂ is a liquid that soaks into the fuel

When diluting a concentrated acid, which method is safe?

1. AAdd the acid slowly to the water
2. BMix them in any order, as long as it is fast
3. CAdd the water slowly to the acid
4. DAdd the water quickly to the acid

Magnesium forms Mg²⁺ ions and oxygen forms O²⁻ ions. What is the formula of magnesium oxide?

1. AMg₂O₂
2. BMgO
3. CMg₂O
4. DMgO₂

Уравняйте уравнение __C₃H₈ + __O₂ → __CO₂ + __H₂O. Каков коэффициент перед O₂?

1. A5
2. B4
3. C10
4. D3

Steel can be protected from rusting by coating it with zinc (galvanising). Why does the steel stay protected even if the zinc coating is scratched?

1. AZinc is less reactive than iron, so it pushes oxygen and water away from the iron
2. BZinc absorbs all the water from the air
3. CZinc turns the iron into a noble metal
4. DZinc is more reactive than iron, so it corrodes instead of the iron