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

Plants absorb energy from sunlight during photosynthesis. How is photosynthesis classified?

1. ANuclear
2. BExothermic
3. CNeutralisation
4. DEndothermic

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

1. AНейтралізація
2. BСинтез
3. CПодвійне заміщення
4. DРозкладання

Яка хімічна формула води?

1. AH₂O
2. BH₂O₂
3. CHO₂
4. DOH

Why is a carbon dioxide extinguisher effective on many fires?

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

What percentage of the mass of water (H₂O, 18 g/mol) is hydrogen (H = 1 g/mol)?

1. AAbout 5,6%
2. BAbout 11%
3. CAbout 67%
4. DAbout 89%

During digestion, large molecules are broken down by adding water across their bonds. What is this reaction called?

1. ACondensation
2. BCombustion
3. CHydrolysis
4. DPolymerisation

Ethanol (CH₃CH₂OH) and dimethyl ether (CH₃OCH₃) have the same formula, C₂H₆O, but ethanol boils at a much higher temperature. Why?

1. AEthanol molecules are heavier than dimethyl ether molecules
2. BDimethyl ether is ionic and ethanol is covalent
3. CEthanol has more carbon atoms
4. DEthanol has an O–H group, so its molecules form hydrogen bonds with each other

Hydrogen peroxide fizzes when poured on a cut because an enzyme in blood breaks it down. What gas is produced, and what type of reaction is it?

1. AHydrogen, in a single replacement reaction
2. BChlorine, in a synthesis reaction
3. COxygen, in a decomposition reaction
4. DCarbon dioxide, in a combustion reaction