CHEMICAL REACTIONS

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CHEMICAL REACTIONS I

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Evora Reguillo Amoros

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CHEMICAL REACTIONS


CHEMICAL REACTIONSVersión en línea CHEMICAL REACTIONS I por Evora Reguillo Amoros 1 A physical change doesn’t affect to the inner structure of matter, so it does not produce a new substance a True b False 2 A chemical change does not affect to the inner structure of matter and produces new substances that didn’t exist before. a True b False 3 How to identify a chemical change? Escoge una o varias respuestas a Gas release b Temperature and colour change c Energy is released as light d We don't see two different subtances 4 In a chemical reaction the new substances are called... a Reactants b Products 5 The rearrangement of atoms only happens if there are effective collisions between the atoms. A collision is effective when it has: Escoge una o varias respuestas a Enough energy b Proper orientation of the atoms c Different colour d One substance is not soluble in the other 6 All the chemical reactions happen at the same speed. The speed of a chemical reaction is related to the reaction rate, and represents a measure of how fast reactants are consumed and products are formed. a True b False 7 Some of the factors that may affect to the chemical reaction speed are: Escoge una o varias respuestas a Physical state of the reactants b Temperature c Particles size d Concentration of reactants 8 Mass cannot be created or destroyed in a chemical reaction. It only rearranges its atoms forming new substances. a True b False 9 Subtances exists in nature and also in the laboratories, since the Industrial Revolution. Then, products can have natural or artificial origin. a True b False 10 Some of the uses of this in the modern chemical industry are: Escoge una o varias respuestas a Pharmaceuticals b Recyclable bags c Artificial fragrances and flavours d Different types of fruits 11 As a result of chemical industry development, the surroundings of the industries have been affected with different type of pollution: a Atmospheric and water pollution. b Atmospheric, soil and water pollution. c Water pollution d Soil pollution 12 Scientist don't care about problems caused by chemical industries. a False b True 13 The greenhouse effect is a naturally occurring phenomenon in which the specific gases in the atmosphere of the Earth trap heat from the sun. One of the direct consequences of global warming is the melting of continental ice, which lead with a increase in the sea levels and t he humidity of the atmosphere. a True b False 14 Acid rain isn't one of the consequences of air pollution. Gases produced from the burning of fuels react with the oxygen in the air and water vapour, transforming into acids (sulphuric acid and nitric acid) that fall onto the earth's surface as rain. a False b True 15 Ozone layer is critical role lies in absorbing and filtering out most of the harmful ultraviolet (UV) radiation, specifically UV-B and UV-C, emitted by the sun. a True b False

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CHEMICAL REACTIONS

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CHEMICAL REACTIONSVersión en línea

por Evora Reguillo Amoros

A physical change doesn’t affect to the inner structure of matter, so it does not produce a new substance

A chemical change does not affect to the inner structure of matter and produces new substances that didn’t exist before.

How to identify a chemical change?

Escoge una o varias respuestas

In a chemical reaction the new substances are called...

The rearrangement of atoms only happens if there are effective collisions between the atoms. A collision is effective when it has:

Escoge una o varias respuestas

All the chemical reactions happen at the same speed. The speed of a chemical reaction is related to the reaction rate, and represents a measure of how fast reactants are consumed and products are formed.

Some of the factors that may affect to the chemical reaction speed are:

Escoge una o varias respuestas

Mass cannot be created or destroyed in a chemical reaction. It only rearranges its atoms forming new substances.

Subtances exists in nature and also in the laboratories, since the Industrial Revolution. Then, products can have natural or artificial origin.

Some of the uses of this in the modern chemical industry are:

Escoge una o varias respuestas

As a result of chemical industry development, the surroundings of the industries have been affected with different type of pollution:

Scientist don't care about problems caused by chemical industries.

Acid rain isn't one of the consequences of air pollution. Gases produced from the burning of fuels react with the oxygen in the air and water vapour, transforming into acids (sulphuric acid and nitric acid) that fall onto the earth's surface as rain.

Ozone layer is critical role lies in absorbing and filtering out most of the harmful ultraviolet (UV) radiation, specifically UV-B and UV-C, emitted by the sun.