Užduočių lapas tema Chemija slaugos stojamiesiems egzaminams su atsakymais

What is oxidation, in terms of electrons?

1. ALoss of protons
2. BLoss of electrons
3. CGain of electrons
4. DGain of neutrons

Which of these is a chemical property?

1. ABoiling point
2. BDensity
3. CFlammability
4. DColour

What is an unsaturated solution?

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

Why do group 1 metals such as sodium react so easily?

1. AThey have one outer electron that is easily lost
2. BThey have a full outer shell of electrons
3. CTheir nuclei contain no neutrons
4. DThey easily gain one extra electron

A radioactive isotope has a half-life of 5 days. A sample starts with 80 g. How much is left after 10 days?

1. A0 g
2. B40 g
3. C20 g
4. D10 g

A red blood cell is placed in pure water (a hypotonic solution). What happens?

1. AWater leaves the cell, which shrinks and wrinkles
2. BNothing happens to the cell
3. CWater enters the cell, which swells and may burst
4. DSalt enters the cell, which shrinks

Pepsin digests protein in the stomach at about pH 2, but it stops working once food moves into the small intestine, where the pH is higher. Why?

1. APepsin is used up completely in the stomach, just like a reactant
2. BPepsin only works on fats in the small intestine
3. CThe change in pH alters the shape of pepsin's active site
4. DThe small intestine is too cold for any enzyme

Cells oxidise glucose to CO₂ and water, as burning glucose does. How does cellular respiration differ from burning?

1. AIt does not need oxygen at any stage
2. BIt releases much more total energy than burning the same glucose
3. CIt releases the energy in many small, enzyme-controlled steps
4. DIt produces different products from burning