Užduočių lapas tema Chemija slaugos stojamiesiems egzaminams su atsakymais

Elements in the same period of the periodic table have the same number of what?

1. AProtons
2. BNeutrons
3. CValence electrons
4. DOccupied electron shells

Plants absorb energy from sunlight during photosynthesis. How is photosynthesis classified?

1. ANuclear
2. BExothermic
3. CNeutralisation
4. DEndothermic

What is the formula of sulfuric acid?

1. AH₂SO₄
2. BH₂SO₃
3. CHNO₃
4. DHCl

During digestion, large molecules are broken down by adding water across their bonds. What is this reaction called?

1. ACondensation
2. BCombustion
3. CHydrolysis
4. DPolymerisation

How does a catalyst speed up a reaction?

1. AIt raises the temperature of the reactants so they move faster
2. BIt makes the reaction more exothermic
3. CIt adds extra reactant to the mixture
4. DIt provides a different pathway with a lower activation energy

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. CIt has a higher boiling point than water
4. DIts molecules are heavier than water molecules

Equal masses of sand and water sit in the sun and absorb the same amount of heat. Which warms up more, and why?

1. ABoth warm equally, because they absorbed the same heat
2. BSand, because it has a higher specific heat capacity than water
3. CSand, because it has a lower specific heat capacity than water
4. DWater, because it has a higher specific heat capacity than sand

Magnesium burns as 2Mg + O₂ → 2MgO. What mass of MgO (40 g/mol) forms from 48 g of Mg (24 g/mol)?

1. A40 g
2. B160 g
3. C48 g
4. D80 g