Užduočių lapas tema Chemija slaugos stojamiesiems egzaminams su atsakymais

What colour does blue litmus paper turn in an acid?

1. APurple
2. BGreen
3. CRed
4. DBlue (no change)

Natris ir kalis priklauso kuriai grupei?

1. AŠarminiams žemės metalams (2 grupė)
2. BTauriosioms dujoms (18 grupė)
3. CHalogenams (17 grupė)
4. DŠarminiams metalams (1 grupė)

What is the molar mass of oxygen gas, O₂ (O = 16 g/mol)?

1. A48 g/mol
2. B8 g/mol
3. C32 g/mol
4. D16 g/mol

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

1. ASodium chloride
2. BPotassium chloride
3. CGlucose
4. DHydrochloric acid

Vinegar contains acetic acid, CH₃COOH. Which functional group makes it an acid?

1. AThe methyl group, –CH₃
2. BThe amino group, –NH₂
3. CThe hydroxyl group of an alcohol, –OH
4. DThe carboxyl group, –COOH

On an energy diagram, the products are at a lower energy than the reactants. What kind of reaction is shown?

1. AEndothermic
2. BNuclear
3. CReversible only
4. DExothermic

Methane burns as CH₄ + 2O₂ → CO₂ + 2H₂O. What mass of CO₂ (44 g/mol) forms from 16 g of CH₄ (16 g/mol)?

1. A88 g
2. B22 g
3. C44 g
4. D16 g

Starch and cellulose are both made entirely of glucose units, yet humans can digest starch but not cellulose. Why?

1. AThe glucose units are linked differently, and humans lack an enzyme to break cellulose's links
2. BCellulose dissolves in water, so it is lost from the gut
3. CStarch contains nitrogen, which makes it easier to digest
4. DCellulose is really made of amino acids, not glucose, so stomach acid cannot break it