ورقة عمل الكيمياء لامتحانات القبول في التمريض مع الإجابات

Carbon has an atomic mass of 12. What is the mass of 1 mole of carbon atoms?

1. A24 g
2. B1 g
3. C12 g
4. D6 g

في التفاعل AB → A + B، أي نوع من التفاعلات يظهر؟

1. Aالتركيب
2. Bالتعادل
3. Cالتحلل
4. Dالإحلال المزدوج

Between which kinds of elements do covalent bonds usually form?

1. AA metal and a noble gas
2. BTwo nonmetals
3. CA metal and a nonmetal
4. DTwo group 1 metals

Which is larger, a sodium atom (Na) or a sodium ion (Na⁺)?

1. AThe sodium ion
2. BThe sodium atom
3. CThey are the same size
4. DIt depends on the temperature

A bag of 5% (w/v) glucose solution (called 5% dextrose in the US) contains 5 g of glucose per 100 mL. How many grams of glucose are in 1 L?

1. A500 g
2. B5 g
3. C0,5 g
4. D50 g

ماذا يحدث لدرجة حرارة ماء مثلج أثناء انصهار الجليد؟

1. Aترتفع إلى 100 °C فورًا
2. Bتنخفض دون 0 °C
3. Cترتفع بثبات طوال الوقت
4. Dتبقى عند 0 °C حتى ينصهر كل الجليد

Gently heating DNA separates its two strands, but each strand stays in one piece. Why?

1. AThe strands are held together by weak hydrogen bonds, while each strand's backbone is covalent
2. BThe two strands are joined by ionic bonds that melt first
3. CEach strand is held together by hydrogen bonds, while the two strands are joined by covalent bonds
4. DHeat converts DNA into a protein

A compound is a gas at room temperature, does not conduct electricity in any state, and is made of two nonmetals. What kind of substance is it most likely?

1. AA giant covalent network solid
2. BAn ionic compound (a lattice of ions)
3. CA simple molecular (covalent) substance
4. DA metal with delocalised electrons