EChemTest - Demotest

DEMO TEST n.3

Question 1 / 8

The two non-metals in the following group are:

potassium

iodine

uranium

iron

argon

Question 2 / 8

When marble pieces are added to hydrochloric acid, the following reaction takes place: CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l) + CO₂(g)Which of the following actions would increase the rate of formation of carbon dioxide?

Reducing the size of the marble pieces

Heating the reaction mixture

Adding water to the reaction mixture

Collecting the carbon dioxide in a gas cylinder

Using nitric acid instead of hydrochloric acid

Question 3 / 8

Compounds that have high melting points, conduct electricity in the molten phase and are often soluble in water are

organic

ionic

metallic

hydrogen compounds

covalent

Question 4 / 8

From the list, select the gases that can be collected using the apparatus shown in the diagram on the left.

Ammonia

Hydrogen

Methane

Carbon dioxide

Chlorine

Question 5 / 8

Oxides which produce alkaline solutions when mixed with water include:

SiO₂

Al₂O₃

SO₂

CaO

Na₂O

Question 6 / 8

Calculate how many moles of ethanoic acid (CH₃COOH: relative molecular mass 60) may be produced from 92 g of ethanol (CH₃CH₂OH: relative molecular mass 46). Answer:

Question 7 / 8

The reaction between zinc (Zn) and hydrochloric acid produces...

zinc hydride and chlorine

zinc hydroxide and chlorine

zinc chloride and hydrogen

zinc hydride and water

zinc hypochlorite

Question 8 / 8

Which of the following would yield the greatest amount of useful energy ?

1 kg of grass fed to a horse working in the field.

1 kg of water dropped 100 m in a hydroelectric plant.

1 kg of uranium in a nuclear plant.

1 h of sunshine over a photo voltaic plant of 1 km² surface.

1 litre of petrol (gasoline) used as fuel in a motor.

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