ورقة عمل الكيمياء لامتحانات القبول في التمريض مع الإجابات

Between which kinds of elements do covalent bonds usually form?

1. ATwo nonmetals
2. BA metal and a nonmetal
3. CTwo group 1 metals
4. DA metal and a noble gas

What is gamma radiation?

1. AHigh-energy electromagnetic radiation with no mass or charge
2. BA slow-moving electron
3. CA stream of helium nuclei with a positive charge
4. DA fast stream of protons from the nucleus

Which property is typical of nonmetals?

1. AThey easily lose electrons to form positive ions
2. BThey are poor conductors of heat and electricity
3. CThey are all solids at room temperature
4. DThey are shiny and easily bent into wires

Which equation shows a combustion reaction?

1. ANaOH + HCl → NaCl + H₂O
2. BCaCO₃ → CaO + CO₂
3. CZn + CuSO₄ → ZnSO₄ + Cu
4. DC₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

How many oxygen atoms are in one formula unit of calcium nitrate, Ca(NO₃)₂?

1. A6
2. B3
3. C2
4. D5

How much heat is needed to raise the temperature of 100 g of water by 10 °C (specific heat of water = 4,18 J/g·°C)?

1. A41,8 J
2. B41,800 J
3. C4180 J
4. D418 J

Alkanes follow the general formula CₙH₂ₙ₊₂. What is the formula of the alkane with 4 carbon atoms?

1. AC₄H₁₀
2. BC₄H₈
3. CC₄H₆
4. DC₄H₁₂

A solution of acetic acid conducts electricity only weakly, while hydrochloric acid of the same concentration conducts strongly. Why?

1. AAcetic acid does not dissolve in water at all
2. BAcetic acid only partly ionises, so it forms fewer ions
3. CHydrochloric acid contains metal atoms
4. DAcetic acid forms more ions than hydrochloric acid does