Užduočių lapas tema Chemija slaugos stojamiesiems egzaminams su atsakymais

What range does the common pH scale cover?

1. A−7 to +7
2. B0 to 100
3. C0 to 14
4. D1 to 10

What is an unsaturated solution?

1. AA solution with undissolved solid at the bottom
2. BA solution that holds the maximum possible solute
3. CA solution that can still dissolve more solute
4. DA solution with no solute at all

At sea level, at what temperature does pure water freeze?

1. A−32 °C (−26 °F)
2. B100 °C (212 °F)
3. C32 °C (90 °F)
4. D0 °C (32 °F)

Magnio atomas praranda du elektronus. Koks jonas susidaro?

1. AMg⁻
2. BMg²⁻
3. CMg²⁺
4. DMg⁺

What is the mass of 0,5 mol of NaCl (molar mass 58,5 g/mol)?

1. A117 g
2. B0,5 g
3. C58,5 g
4. D29,25 g

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

Why is incomplete combustion of fuel in a poorly ventilated room dangerous?

1. AIt produces carbon monoxide, which binds to haemoglobin and blocks oxygen transport
2. BIt produces water vapour, which is toxic
3. CIt produces extra oxygen, which damages the lining of the lungs over time
4. DIt produces nitrogen, which replaces oxygen in the blood

A solution has a hydroxide ion concentration of 1 × 10⁻³ mol/L. What is its pH at 25 °C?

1. A11
2. B14
3. C7
4. D3