ورقة عمل الكيمياء لامتحانات القبول في التمريض مع الإجابات

Which process is exothermic (releases heat)?

1. ABurning methane gas
2. BPhotosynthesis
3. CMelting a block of ice
4. DEvaporating water

A cleaning solution has a pH of 12. How is it described?

1. ANeutral
2. BStrongly basic
3. CWeakly acidic
4. DStrongly acidic

ذرة فيها 6 بروتونات و6 نيوترونات و6 إلكترونات. ما عددها الكتلي؟

1. A6
2. B0
3. C12
4. D18

A piece of metal has a density of 8 g/cm³ and a volume of 5 cm³. What is its mass?

1. A13 g
2. B40 g
3. C1,6 g
4. D0,625 g

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

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

What is the mass of 0,5 mol of NaCl (molar mass 58,5 g/mol)?

1. A0,5 g
2. B29,25 g
3. C117 g
4. D58,5 g

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

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

In the reaction 2Na + Cl₂ → 2NaCl, which substance is the oxidising agent?

1. ANaCl
2. BNa
3. CNa⁺
4. DCl₂