تدريب عام: Unit 1 : Thermal Energy and Changes of Matter (Science) - Preparatory 2 - Science

السؤال 1

What does the Fuel Calorific Value represent?

The rate at which fuel consumes oxygen.

The minimum temperature required for fuel ignition.

The energy produced from the combustion of 1g of fuel in excess oxygen.

The amount of oxygen needed to burn 1g of fuel.

السؤال 2

Why does a candle flame go out when placed under a glass bell jar?

The candle wax runs out quickly in a confined space.

The carbon dioxide produced accumulates and smothers the flame.

The temperature inside the jar increases significantly.

The oxygen supply required for combustion is depleted.

السؤال 3

During the condensation stage of the refrigeration cycle, where is heat released?

To the compressor within the refrigerator.

To the surrounding medium behind the refrigerator.

To the expansion valve.

To the food inside the refrigerator.

السؤال 4

What type of chemical reaction allows fireflies to emit light from their bodies?

An exothermic chemical reaction converting most energy into light.

A decomposition reaction releasing heat only.

A neutralization reaction producing light.

An endothermic reaction that absorbs light.

السؤال 5

Nesting two polystyrene cups together would decrease thermal insulation during an experiment.

False

True

السؤال 6

The reaction of magnesium with dilute hydrochloric acid is an endothermic process.

False

True

السؤال 7

Why are combustion reactions considered a type of oxidation-reduction reaction?

They only involve an increase in oxygen content.

They always generate light and heat.

They involve simultaneous oxidation and reduction processes.

They always produce carbon dioxide and water.

السؤال 8

Water should be used to extinguish fires involving sodium or potassium metals.

True

False

السؤال 9

How does evaporation affect the thermal energy of its surroundings?

It has no effect on the surrounding temperature.

It releases heat into the surroundings.

It absorbs heat from the surroundings.

It creates new chemical bonds.

السؤال 10

What is the typical appearance of anhydrous copper sulfate?

White solid

Pink crystals

Colorless liquid

Blue solution

السؤال 11

A thermochemical equation for an exothermic reaction typically shows 'Heat' as a reactant.

False

True

السؤال 12

Which action represents the principle of fuel removal in fire extinguishing?

Covering a fire with a blanket.

Closing gas valves during a fire.

Applying foam to an oil fire.

Spraying water on burning wood.

السؤال 13

What term describes the amount of heat absorbed or released when a specific quantity of solute dissolves in a known volume of solvent?

Heat of neutralization

Heat of combustion

Heat of dissolution

Heat of formation

السؤال 14

Why is water effective in extinguishing fires involving materials like paper and wood?

Water isolates oxygen from the burning materials.

Water reacts with the burning materials to form non-flammable gases.

Water lowers the temperature of burning materials below their ignition point.

Water increases the fuel value of the burning materials.

السؤال 15

According to the provided table, which fuel has the highest calorific value per gram?

Hydrogen

Natural Gas

Wood

Ethanol

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تدريب عام: Unit 1 : Thermal Energy and Changes of Matter (Science) - Preparatory 2

What does the Fuel Calorific Value represent?

Why does a candle flame go out when placed under a glass bell jar?

During the condensation stage of the refrigeration cycle, where is heat released?

What type of chemical reaction allows fireflies to emit light from their bodies?

Nesting two polystyrene cups together would decrease thermal insulation during an experiment.

The reaction of magnesium with dilute hydrochloric acid is an endothermic process.

Why are combustion reactions considered a type of oxidation-reduction reaction?

Water should be used to extinguish fires involving sodium or potassium metals.

How does evaporation affect the thermal energy of its surroundings?

What is the typical appearance of anhydrous copper sulfate?

A thermochemical equation for an exothermic reaction typically shows 'Heat' as a reactant.

Which action represents the principle of fuel removal in fire extinguishing?

What term describes the amount of heat absorbed or released when a specific quantity of solute dissolves in a known volume of solvent?

Why is water effective in extinguishing fires involving materials like paper and wood?

According to the provided table, which fuel has the highest calorific value per gram?