ورقة عمل الكيمياء لامتحانات القبول في التمريض مع الإجابات

What is plasma, as a state of matter?

1. AThe liquid part of blood
2. BA liquid that has been cooled below its freezing point
3. CA solid that conducts electricity
4. DA very hot gas in which atoms have lost electrons and become ions

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

1. APressure and number of moles
2. BDensity and mass
3. CPressure and volume
4. DVolume and temperature

About what percentage of dry air is oxygen?

1. A50%
2. B21%
3. C1%
4. D78%

When a nucleus emits a beta particle, how do its mass number and atomic number change?

1. AMass number stays the same and atomic number rises by 1
2. BBoth fall by 1
3. CMass number rises by 1 and atomic number stays the same
4. DMass number falls by 4 and atomic number falls by 2

Which nuclear process powers the Sun?

1. AFusion of hydrogen nuclei to form helium
2. BCombustion of hydrogen gas with oxygen in its core
3. CAlpha decay of helium
4. DFission of uranium into smaller nuclei

ما الكتلة المولية للماء (H = 1 g/mol، O = 16 g/mol)؟

1. A32 g/mol
2. B17 g/mol
3. C18 g/mol
4. D10 g/mol

Making ammonia (N₂ + 3H₂ ⇌ 2NH₃) is exothermic. A low temperature would give a higher yield, yet factories use a moderately high temperature. Why?

1. AAt low temperatures the reaction is too slow to be useful
2. BHigher temperatures shift the equilibrium toward more ammonia
3. CLow temperatures would make the ammonia explode
4. DThe catalyst only works when the reaction is endothermic

أي رمز نظير يصف ذرة فيها 8 بروتونات و10 نيوترونات؟

1. Aالأرغون-18
2. Bالنيون-18
3. Cالأكسجين-10
4. Dالأكسجين-18