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 liquid that forms when a solid melts
4. DA substance that speeds up a reaction

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

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

Boyle's law describes the relationship between which two properties of a gas, at constant temperature?

1. APressure and temperature
2. BVolume and temperature
3. CMass and volume
4. DPressure and volume

أُذيب مولان من الغلوكوز في الماء لتكوين 4 لترات من المحلول. ما المولارية؟

1. A2 M
2. B4 M
3. C8 M
4. D0,5 M

أي عبارة تصف الحمض القوي؟

1. Aيطلق أيونات الهيدروجين جزئيًا فقط
2. Bيكون دائمًا عالي التركيز
3. Cرقمه الهيدروجيني أعلى من 7
4. Dيتأين تمامًا في الماء

How does dissolving salt in water affect the water's boiling point?

1. AIt lowers the boiling point slightly
2. BIt raises the boiling point slightly
3. CIt has no effect on the boiling point
4. DIt makes the water boil at room temperature

أي قائمة ترتّب العناصر بحسب تزايد نصف القطر الذري؟

1. AF, O, N, C
2. BNa, Mg, Al, Si
3. CO, F, N, C
4. DC, N, O, F

A student tests whether water temperature affects how fast sugar dissolves. Which set of factors should be kept the same in every trial?

1. AOnly the colour of the cup
2. BThe water temperature and the dissolving time
3. CThe mass of sugar, the type of sugar, the volume of water and the amount of stirring
4. DNothing, because changing several factors at once gives more useful data