Робочий аркуш «Хімія для вступних іспитів на медсестринство» з відповідями

An instant cold pack feels cold when the substance inside dissolves. How is this dissolving process classified?

1. AA neutralisation reaction
2. BEndothermic
3. CExothermic
4. DA combustion reaction

Реакція AB → A + B. Який тип реакції показано?

1. AНейтралізація
2. BПодвійне заміщення
3. CСинтез
4. DРозкладання

What is absolute zero?

1. A−100 °C, the coldest temperature on Earth
2. B0 °F, the temperature of a salt and ice mixture
3. C0 K, about −273 °C, the lowest possible temperature
4. D0 °C, the point at which pure water freezes into ice

In 2KClO₃ → 2KCl + 3O₂, how many moles of O₂ form from 4 mol of KClO₃?

1. A4 mol
2. B3 mol
3. C8 mol
4. D6 mol

When two monomers join to form a larger molecule and a water molecule is released, what is the reaction called?

1. ACombustion
2. BCondensation (dehydration synthesis)
3. CHydrolysis (splitting with water)
4. DNeutralisation

0,5 mol of KCl is dissolved to make 250 mL of solution. What is its molarity?

1. A0,5 M
2. B2 M
3. C125 M
4. D0,125 M

Na⁺, Mg²⁺, F⁻ and O²⁻ all have 10 electrons. Which ion is the largest?

1. ANa⁺
2. BMg²⁺
3. CF⁻
4. DO²⁻

In the reaction 2Na + Cl₂ → 2NaCl, which substance is the oxidising agent?

1. ACl₂
2. BNaCl
3. CNa⁺
4. DNa