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

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

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

What are enzymes?

1. AFats that form most of the cell membrane
2. BBiological catalysts, usually proteins
3. CSugars that store energy in the liver
4. DMinerals that build bone

Which element makes up the largest share of the human body by mass?

1. AHydrogen
2. BOxygen
3. CCarbon
4. DNitrogen

When diluting a concentrated acid, which method is safe?

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

According to the Brønsted–Lowry definition, what is an acid?

1. AA proton (H⁺) acceptor
2. BA proton (H⁺) donor
3. CA hydroxide ion donor
4. DAn electron pair donor

What is the name of the compound CaCO₃?

1. ACalcium carbonate
2. BCalcium carbide
3. CCalcium oxide
4. DCarbon calcium trioxide

Haemoglobin binds oxygen reversibly: Hb + O₂ ⇌ HbO₂. How does this equilibrium help deliver oxygen to tissues?

1. ALow O₂ in tissues shifts it to the right, releasing oxygen
2. BThe equilibrium does not change anywhere in the body
3. CLow O₂ in tissues shifts it to the left, releasing oxygen
4. DHigh O₂ in tissues shifts it to the left, absorbing oxygen

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

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