Užduočių lapas tema Chemija slaugos stojamiesiems egzaminams su atsakymais

Apart from mercury, which element is a liquid at room temperature?

1. AIodine
2. BChlorine
3. CBromine
4. DSodium

Boyle's law describes the relationship between which two properties of a gas, at constant temperature?

1. AMass and volume
2. BPressure and temperature
3. CPressure and volume
4. DVolume and temperature

What do the letters STP stand for in gas chemistry?

1. ASpecific temperature and particles
2. BStandard temperature and pressure
3. CStable temperature point
4. DStandard time and pressure

Which list is in order from smallest to largest mass?

1. AMilligram, kilogram, gram
2. BKilogram, gram, milligram
3. CMilligram, gram, kilogram
4. DGram, milligram, kilogram

Why does keeping food in a refrigerator slow down spoilage?

1. ALower temperatures raise the activation energy of every reaction
2. BCold air contains no oxygen
3. CCold temperatures add preservatives to the food
4. DLower temperatures slow down chemical and microbial reactions

How many moles of gas are in 44,8 L at STP (0 °C and 1 atm)?

1. A22,4 mol
2. B0,5 mol
3. C44,8 mol
4. D2 mol

Glucose (C₆H₁₂O₆) and fructose (C₆H₁₂O₆) join by a condensation reaction to form sucrose. What is the formula of sucrose?

1. AC₁₂H₂₄O₁₂
2. BC₁₂H₂₂O₁₁
3. CC₁₂H₂₀O₁₀
4. DC₆H₁₂O₆

A small amount of acid is spilled on a lab bench. Why is a weak base such as sodium bicarbonate preferred over strong NaOH to neutralise it?

1. ASodium bicarbonate makes the spilled acid evaporate
2. BNaOH does not react with acids at room temperature
3. CSodium bicarbonate is a strong acid that cancels the spill
4. DExcess sodium bicarbonate is far less harmful than excess NaOH