ورقة عمل الكيمياء لامتحانات القبول في التمريض مع الإجابات

What is a precipitate?

1. AAn insoluble solid that forms when two solutions react
2. BA gas that bubbles out when two solutions are mixed
3. CA substance that speeds up a reaction
4. DA liquid that forms when a solid melts

In a chemical equation, what does the symbol (aq) after a formula mean?

1. AA solid
2. BA pure liquid
3. CDissolved in water
4. DA gas

What is an unsaturated solution?

1. AA solution with no solute at all
2. BA solution that can still dissolve more solute
3. CA solution with undissolved solid at the bottom
4. DA solution that holds the maximum possible solute

Which element has chemical properties most similar to calcium?

1. ACarbon
2. BMagnesium
3. CScandium
4. DPotassium

كيف يؤثر ارتفاع درجة الحرارة عادةً في مقدار ما يذوب من مادة صلبة في الماء؟

1. Aلا أثر له في المواد الصلبة
2. Bتتحول المادة الصلبة إلى غاز
3. Cيذوب منها أقل
4. Dيذوب منها أكثر

Nitric acid (HNO₃) reacts with potassium hydroxide (KOH). Which salt forms?

1. ANitrogen hydroxide, NOH
2. BPotassium nitrate, KNO₃
3. CPotassium nitrite, KNO₂
4. DPotassium hydride, KH

For N₂ + 3H₂ → 2NH₃, 1 mol of N₂ is mixed with 2 mol of H₂. Which reactant is limiting?

1. ANeither, because both are used up exactly
2. BH₂, because 1 mol of N₂ would need 3 mol of H₂
3. CNH₃, because it is the product
4. DN₂, because there is less of it

Uranium-238 (atomic number 92) undergoes alpha decay. Which nucleus is formed?

1. APlutonium-242 (atomic number 94)
2. BThorium-238 (atomic number 90)
3. CProtactinium-234 (atomic number 91)
4. DThorium-234 (atomic number 90)