Chemia na egzaminy wstępne na pielęgniarstwo: karta pracy z odpowiedziami

What does the law of conservation of mass state?

1. AThe mass of products is always greater than the mass of reactants
2. BMass is lost as heat in every reaction
3. CGases have no mass
4. DMass is neither created nor destroyed in a chemical reaction

Przy poziomie morza, w jakiej temperaturze wrze czysta woda?

1. A37 °C (98,6 °F)
2. B100 °C (212 °F)
3. C0 °C (32 °F)
4. D50 °C (122 °F)

Co powstaje, gdy kwas i zasada się zobojętniają?

1. ATylko dwutlenek węgla
2. BMocniejszy kwas
3. CMetal i gazowy wodór
4. DSól i woda

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

1. ANeutralisation
2. BCombustion
3. CCondensation (dehydration synthesis)
4. DHydrolysis (splitting with water)

How does a catalyst speed up a reaction?

1. AIt provides a different pathway with a lower activation energy
2. BIt makes the reaction more exothermic
3. CIt raises the temperature of the reactants so they move faster
4. DIt adds extra reactant to the mixture

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

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

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. ACarbon dioxide, in a combustion reaction
2. BChlorine, in a synthesis reaction
3. CHydrogen, in a single replacement reaction
4. DOxygen, in a decomposition reaction

Many ethene (C₂H₄) molecules join together to form poly(ethene), a plastic. What type of reaction is this?

1. ACondensation polymerisation, in which a water molecule is released at each new link
2. BCombustion, in which ethene reacts with oxygen
3. CAddition polymerisation, in which the C=C double bonds open up to link the monomers
4. DHydrolysis, in which water breaks each monomer apart