Chemistry for nursing entrance exams worksheet with answers

What does the atomic number of an element tell you?

1. AThe number of atoms in one mole of the element
2. BThe number of neutrons in each atom
3. CThe number of protons in each atom
4. DThe total number of protons and neutrons in the nucleus

Which of these is a chemical change?

1. ASugar dissolving in tea
2. BGlass breaking
3. CIce melting
4. DWood burning

Which mixture is a suspension?

1. ASugar dissolved in water
2. BSand stirred into water
3. CSalt dissolved in water
4. DOxygen dissolved in water

How is 0.00045 written in scientific notation?

1. A4.5 × 10⁴
2. B4.5 × 10⁻⁴
3. C4.5 × 10⁻⁵
4. D4.5 × 10⁻³

In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which species loses electrons?

1. ACu²⁺
2. BZn
3. CZn²⁺
4. DCu

In the reaction 2H₂ + O₂ → 2H₂O, how many moles of water form from 3 moles of oxygen?

1. A1.5 mol
2. B6 mol
3. C2 mol
4. D3 mol

A scuba diver breathes compressed air deep underwater. Why must the diver breathe out while swimming up to the surface?

1. AThe water gets warmer near the surface
2. BThe air in the lungs shrinks as the outside pressure falls
3. CThe air in the lungs expands as the outside pressure falls
4. DOxygen turns to liquid at the surface

Which sample contains the greatest number of atoms?

1. A1 mol of O₂
2. B1 mol of H₂O
3. C1 mol of CH₄
4. D1 mol of He