Chemia na egzaminy wstępne na pielęgniarstwo: karta pracy z odpowiedziami

What is a molecule?

1. ATwo or more atoms held together by covalent bonds
2. BA mixture of two different elements
3. CThe nucleus of an atom
4. DA single atom with a positive charge

What should a student always wear to protect the eyes when working with chemicals?

1. AContact lenses
2. BSafety goggles
3. CReading glasses
4. DSunglasses

For a given substance, in which state do its particles move fastest?

1. ASolid
2. BThey move at the same speed in all states
3. CLiquid
4. DGas

How does electronegativity change going down a group?

1. AIt increases
2. BIt decreases
3. CIt doubles with each period
4. DIt stays the same

Water has a high specific heat capacity. How does this help the human body?

1. AIt helps keep body temperature stable
2. BIt makes the blood more acidic
3. CIt allows oxygen to dissolve in water more easily
4. DIt makes water a poor solvent for salts

What does Avogadro's law state?

1. AEqual masses of all gases contain equal numbers of molecules under any conditions
2. BOne mole of any gas has a mass of 22,4 g
3. CThe pressure of a gas doubles when its temperature is halved
4. DEqual volumes of gases at the same temperature and pressure contain equal numbers of molecules

Substancja topi się w 801 °C, jako ciało stałe nie przewodzi prądu, ale w stanie stopionym przewodzi. Jakiego rodzaju substancją jest najprawdopodobniej?

1. AMetalem
2. BProstą substancją kowalencyjną (cząsteczkową)
3. CZwiązkiem jonowym
4. DGazem szlachetnym

Carbon-12 and carbon-14 react in exactly the same way in chemical reactions. Why?

1. AThey have the same number of neutrons
2. BCarbon-14 turns into carbon-12 before reacting
3. CThey have the same mass number
4. DThey have the same number of protons and electrons