ورقة عمل الكيمياء لامتحانات القبول في التمريض مع الإجابات

What is an element?

1. AA substance made of only one kind of atom
2. BA particle with an electric charge
3. CA substance of two or more elements chemically bonded together
4. DA physical mixture of different substances

Plants absorb energy from sunlight during photosynthesis. How is photosynthesis classified?

1. ANuclear
2. BEndothermic
3. CNeutralisation
4. DExothermic

What is an alloy?

1. AA mixture of a metal with one or more other elements
2. BA compound formed when a metal reacts with oxygen
3. CA nonmetal that conducts electricity
4. DA pure metal in its natural state

Why do group 1 metals such as sodium react so easily?

1. AThey easily gain one extra electron
2. BThey have one outer electron that is easily lost
3. CTheir nuclei contain no neutrons
4. DThey have a full outer shell of electrons

كم إلكترون تكافؤ (في الغلاف الخارجي) لذرة الأكسجين؟

1. A6
2. B16
3. C8
4. D2

How does a mixture of iron filings and sulfur powder differ from the compound iron sulfide?

1. AThe compound keeps the magnetic properties of iron
2. BThe mixture has a fixed ratio of iron to sulfur
3. CThe mixture is formed by a chemical reaction between the two elements
4. DThe mixture can be separated physically, for example with a magnet

A nurse wipes a patient's arm with an alcohol swab and the patient says the skin feels cold. What explains this?

1. AThe alcohol is stored at a much lower temperature than the room
2. BThe alcohol reacts with the skin in an endothermic chemical reaction
3. CThe alcohol blocks the skin's nerve endings for warmth
4. DThe alcohol absorbs heat from the skin as it evaporates

Cells oxidise glucose to CO₂ and water, as burning glucose does. How does cellular respiration differ from burning?

1. AIt releases much more total energy than burning the same glucose
2. BIt produces different products from burning
3. CIt releases the energy in many small, enzyme-controlled steps
4. DIt does not need oxygen at any stage