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

Which type of radiation is the most penetrating?

1. AGamma rays
2. BBeta particles
3. CThey are all equally penetrating
4. DAlpha particles

How does increasing the concentration of a reactant in solution usually affect the reaction rate?

1. AThe reaction stops
2. BThe rate stays the same
3. CThe rate decreases
4. DThe rate increases

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

1. AHydroxide ions (OH⁻)
2. BHydrogen ions (H⁺)
3. CChloride ions (Cl⁻)
4. DCarbonate ions (CO₃²⁻)

Why does oxygen move from the alveoli of the lungs into the blood?

1. AThe partial pressure of oxygen is higher in the blood than in the alveoli
2. BThe partial pressure of oxygen is higher in the alveoli than in the blood
3. COxygen is heavier than carbon dioxide
4. DOxygen is pumped actively into the blood

Potassium forms K⁺ ions and sulfur forms S²⁻ ions. What is the name and formula of their compound?

1. APotassium sulfite, KS
2. BPotassium sulfide, KS₂
3. CPotassium sulfate, K₂SO₄
4. DPotassium sulfide, K₂S

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

1. ASynthesis
2. BCombustion
3. CSingle replacement
4. DDecomposition

Sugar is heated in a pan. Which observation shows that a chemical change, not just a physical change, has happened?

1. AIt turns black and gives off water vapour, leaving a solid that is no longer sweet
2. BThe crystals become smaller when crushed
3. CIt gets hot to the touch
4. DIt melts into a clear, runny liquid that sets again when it cools

In terms of bonds, why is a reaction exothermic?

1. AMore energy is absorbed breaking old bonds than is released forming new ones
2. BNo bonds are broken in exothermic reactions
3. CForming bonds always absorbs energy
4. DMore energy is released forming new bonds than is absorbed breaking old ones