ورقة عمل الكيمياء لامتحانات القبول في التمريض مع الإجابات

What is the change from a gas directly to a solid, skipping the liquid state, called?

1. ADeposition
2. BSublimation
3. CFreezing
4. DCondensation

What is a dilute solution?

1. AOne with a large amount of solute in a little solvent
2. BOne in which the solute has reacted with the solvent
3. COne with no solvent at all
4. DOne with a small amount of solute in a lot of solvent

Which of these is a heterogeneous mixture?

1. AOil and water
2. BSugar dissolved in tea
3. CAir
4. DSalt dissolved in water

Which reacts more vigorously with water, potassium or sodium?

1. AThey react equally, because both are in group 1
2. BSodium, because it has fewer electron shells to shield its electron
3. CSodium, because its outer electron is farther from the nucleus
4. DPotassium, because its outer electron is farther from the nucleus

How should the volume of water in a graduated cylinder be read?

1. AAt eye level, from the bottom of the curved surface (meniscus)
2. BFrom below, at the highest point the water touches the glass
3. CFrom above the cylinder, at the top edge of the curved surface
4. DAt any angle, from the middle of the cylinder

The amino acid glycine has an –NH₂ group and a –COOH group. What are these two groups called?

1. AA carbonyl group and an ester group
2. BA hydroxyl group and a methyl group
3. CAn amino group and a carboxyl group
4. DA phosphate group and a hydroxyl group

How does soap help remove grease from skin?

1. ASoap reacts with grease to form water and carbon dioxide
2. BSoap makes the grease more dense so it sinks
3. CEach soap molecule has a polar end that attracts water and a nonpolar end that attracts grease
4. DSoap molecules are completely nonpolar, so they dissolve grease like a solvent

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

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