Užduočių lapas tema Chemija slaugos stojamiesiems egzaminams su atsakymais

What does the prefix "milli-" mean?

1. AOne-hundredth (10⁻²)
2. BOne thousand (10³)
3. COne-millionth (10⁻⁶)
4. DOne-thousandth (10⁻³)

Kuris iš šių pokyčių yra fizikinis?

1. AGeležies rūdijimas
2. BDuonos paskrudinimas iki rusvos spalvos
3. CPieno surūgimas
4. DVandens virimas į garus

Kurios subatominės dalelės yra branduolyje?

1. AProtonai ir neutronai
2. BProtonai ir elektronai
3. CTik elektronai
4. DElektronai ir neutronai

Rubbing alcohol evaporates faster than water at room temperature. What does this suggest?

1. AIts intermolecular forces are weaker than water's
2. BIts intermolecular forces are stronger than water's
3. CIts molecules are heavier than water molecules
4. DIt has a higher boiling point than water

Kurie koeficientai subalansuoja __N₂ + __H₂ → __NH₃?

1. A1, 3, 2
2. B2, 3, 2
3. C1, 3, 1
4. D1, 1, 1

Which substance is a non-electrolyte when dissolved in water?

1. AGlucose
2. BPotassium chloride
3. CSodium chloride
4. DHydrochloric acid

Carbon-12 and carbon-14 react in exactly the same way in chemical reactions. Why?

1. AThey have the same mass number
2. BCarbon-14 turns into carbon-12 before reacting
3. CThey have the same number of neutrons
4. DThey have the same number of protons and electrons

Raising the temperature by 10 °C can roughly double the rate of many reactions. What is the main reason?

1. AThe particles become larger and easier to hit
2. BThe reaction becomes more exothermic
3. CMany more collisions have at least the activation energy
4. DThe activation energy itself is lowered by the extra heat