ورقة عمل الكيمياء لامتحانات القبول في التمريض مع الإجابات

A blown-up balloon is put in a freezer. What happens to its volume?

1. AIt decreases
2. BIt stays exactly the same
3. CIt increases
4. DThe balloon bursts

What does the coefficient 3 in "3H₂O" mean?

1. AEach molecule of water contains three hydrogen atoms
2. BWater has a charge of 3
3. CEach water molecule has three oxygen atoms
4. DThere are three molecules (or moles) of water

Which quantity is the same for 1 mole of any substance?

1. AThe mass in grams
2. BThe volume as a liquid
3. CThe number of particles
4. DThe number of atoms per molecule

What is the conjugate base of nitric acid, HNO₃?

1. AH₂NO₃⁺
2. BNO₃⁻
3. CNO₂⁻
4. DHNO₂

كم إلكترون تكافؤ (في الغلاف الخارجي) لذرة الأكسجين؟

1. A2
2. B8
3. C16
4. D6

What is the name of the compound CaCO₃?

1. ACarbon calcium trioxide
2. BCalcium carbonate
3. CCalcium carbide
4. DCalcium oxide

Why is Dmitri Mendeleev's early periodic table regarded as such a success?

1. AHe discovered the noble gases and placed them in group 18
2. BHe arranged the elements by atomic number, which he had discovered
3. CHe left gaps and correctly predicted the properties of elements not yet discovered
4. DHe proved that the atoms of every element contain electrons

كم غرامًا من NaOH (الكتلة المولية 40 g/mol) يلزم لإعداد 500 mL من محلول تركيزه 0,2 M؟

1. A40 g
2. B8 g
3. C0,1 g
4. D4 g