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WorksheetsCambios químicos
Total questions: 23
Worksheet time: 17mins
Which of these changes are chemical changes?
Cutting a paper.
Boiling water.
The oxidation of an appel.
Respiration.
The main difference between a physical and a chemical change is that...
in a chemical change the color changes but in a physical change the color never changes.
new substances are produced in a physical change but not in a chemical change.
in a chemical change gases are emitted.
new substances are produced in a chemical change but not in a physical change.
What changes can you appreciate in this chemical change:
Change in color.
Change in odor.
Change in temperature.
Production of light.
Formation of a solid.
A chemical change is the same than a chemical reaction.
True.
False.
Which are the reactants in the following chemical reaction:
Methane reacts with oxygen to produce water and carbon dioxide.
Methane.
Water.
Oxygen.
Carbon dioxide.
Which are the products in the following chemical reaction: Sodium reacts with hydrogen chloride to produce sodium chloride and hydrogen.
Sodium chloride.
Hydrogen chloride.
Hydrogen.
Sodium.
New substances are produced in a chemical reaction because...
new atoms are created.
the atoms wich form the reactants reorder and join in a different way.
the atoms wich form the reactants disappear.
A chemical equation is...
the same than a chemical reaction.
a representation of a chemical reaction.
the same than a chemical change.
The law of conservation of mass was proposed by...
Mendeleiev.
Newton.
Lavoisier.
Einstein.
According to the law of conservation of mass...
chemical reactions create matter.
chemcial reactions destroy matter.
chemcial reactions transform matter.
The mass of the reactants is equal to the mass of the products.
What is the value of X?
88 g
60 g.
44 g.
22 g.
The reaction rate is...
the concentration of the reactants.
the temperatura at which a chemical reaction takes place.
the mass of the reactants.
the speed of a chemical reaction.
To increase the speed of a reaction we can...
decrease the temperature.
increase the temperature.
decrease the concentration of the reactants.
increase the concentration of the reactants.
La industria petroquímica se encarga de...
fabricar fertilizantes.
separar los compuestos que forman el petróleo.
fabricar materiales de construcción.
fabricar fármacos.
El objetivo de la industria química es...
generar gases de efecto invernadero.
contaminar el medio ambiente.
producir sustancias necesarias para la sociedad.
Todos los plásticos tienen un origen artificial.
Verdadero.
Falso.
Marca las sustancias que podemos obtener a partir del petróleo:
Fertilizantes.
Gasolina y diésel.
Plásticos.
Medicamentos.
Detergentes.
Los gases responsables del efecto invernadero anómalo son...
CFC
CO2
Óxidos de nitrógeno y azufre.
Los gases responsables del agujero en la capa de ozono son...
CFC
CO2
Óxidos de nitrógeno y azufre.
Los gases responsables de la lluvia ácida son...
CFC
CO2
Óxidos de nitrógeno y azufre.
Los CFC proceden de...
los combustibles fósiles.
aerosoles y refrigeradores.
los gases emitidos por las industrias.
El dióxido de carbono se libera a la atmósfera como consecuencia del uso de...
aerosoles.
refrigeradores.
combustibles fósiles.
La química ambiental se encarga de...
producir sustancias sin generar residuos.
realizar un tratamiento adecuado de los residuos.
analizar las sustancias contaminantes que se encuentran en el medio ambiente.
