Chemia na egzaminy wstępne na pielęgniarstwo: karta pracy z odpowiedziami

What is absolute zero?

1. A0 °C, the point at which pure water freezes into ice
2. B0 °F, the temperature of a salt and ice mixture
3. C−100 °C, the coldest temperature on Earth
4. D0 K, about −273 °C, the lowest possible temperature

Jaki jest symbol chemiczny sodu?

1. ASo
2. BS
3. CN
4. DNa

According to the Arrhenius definition, what does an acid produce in water?

1. AHydrogen ions (H⁺)
2. BOxide ions (O²⁻)
3. CHydroxide ions (OH⁻)
4. DSodium ions (Na⁺)

Dlaczego cząsteczka wody jest polarna?

1. AWoda ma wiązania jonowe między wodorem a tlenem
2. BCząsteczki wody są liniowe, z obydwoma atomami wodoru w jednej linii
3. CTlen silniej przyciąga wspólne elektrony, a cząsteczka jest kątowa
4. DWodór jest bardziej elektroujemny niż tlen

How can you get solid salt back from salt water?

1. AFilter the solution
2. BFreeze the solution and lift out the salt
3. CEvaporate the water
4. DUse a magnet

How many lone (non-bonding) pairs of electrons are on the oxygen atom in a water molecule?

1. A2
2. B4
3. C0
4. D1

What fraction of a radioactive isotope remains after three half-lives?

1. A1/9
2. B1/6
3. C1/3
4. D1/8

A student tests whether water temperature affects how fast sugar dissolves. Which set of factors should be kept the same in every trial?

1. AThe mass of sugar, the type of sugar, the volume of water and the amount of stirring
2. BOnly the colour of the cup
3. CNothing, because changing several factors at once gives more useful data
4. DThe water temperature and the dissolving time