Lembaran kerja Kimia untuk peperiksaan kemasukan kejururawatan dengan jawapan

Which of these is a heterogeneous mixture?

1. AAir
2. BOil and water
3. CSalt dissolved in water
4. DSugar dissolved in tea

Which of these is a polyatomic ion?

1. AOxide, O²⁻
2. BSodium, Na⁺
3. CChloride, Cl⁻
4. DSulfate, SO₄²⁻

What is the formula of sulfuric acid?

1. AH₂SO₄
2. BH₂SO₃
3. CHNO₃
4. DHCl

0.5 mol of KCl is dissolved to make 250 mL of solution. What is its molarity?

1. A2 M
2. B0.5 M
3. C0.125 M
4. D125 M

Which reacts more vigorously with water, potassium or sodium?

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

A room is at 25 °C. What is this temperature in kelvin?

1. A77 K
2. B248 K
3. C298 K
4. D−248 K

Why does a sodium ion (Na⁺) have almost the same mass as a sodium atom?

1. AThe only difference is one electron, which has a tiny mass
2. BThe ion gains a neutron that balances the loss
3. CIons and atoms always have exactly the same mass
4. DThe ion has one fewer proton, which has a tiny mass

A catalyst is added to an exothermic reaction. How does the energy diagram change?

1. AThe reaction becomes endothermic
2. BThe reactants start at a higher energy
3. CThe products end up at a lower energy, so more heat is released
4. DThe peak is lower, but the energy of reactants and products stays the same