ورقة عمل الكيمياء لامتحانات القبول في التمريض مع الإجابات

DNA belongs to which group of biological molecules?

1. ACarbohydrates
2. BNucleic acids
3. CLipids
4. DProteins

What is the name of the polyatomic ion NH₄⁺?

1. ANitride
2. BAmmonia
3. CAmmonium
4. DNitrate

What is a molecule?

1. AA single atom with a positive charge
2. BA mixture of two different elements
3. CTwo or more atoms held together by covalent bonds
4. DThe nucleus of an atom

What are London dispersion forces?

1. AWeak, temporary attractions caused by shifting electrons in molecules
2. BForces that hold protons together in the nucleus
3. CStrong bonds formed by transferring electrons
4. DAttractions between a hydrogen atom and a metal ion

At 20 °C, about 36 g of NaCl dissolves in 100 g of water. If 50 g of NaCl is stirred into 100 g of water at 20 °C, what happens?

1. AAbout 14 g dissolves and about 36 g stays undissolved
2. BAll 50 g dissolves
3. CAbout 36 g dissolves and about 14 g stays undissolved
4. DNone of the salt dissolves

فقدت ذرة ماغنيسيوم إلكترونين. ما الأيون المتكوّن؟

1. AMg⁻
2. BMg²⁺
3. CMg²⁻
4. DMg⁺

أي رابطة هي الأكثر قطبية؟

1. AC–H
2. BCl–Cl
3. CH–F
4. DH–H

A solution has a hydroxide ion concentration of 1 × 10⁻³ mol/L. What is its pH at 25 °C?

1. A11
2. B14
3. C7
4. D3