chemistry chapter 1 Flashcards
what are reactants?
the substances that undergo chemical change in a reaction
what are products?
the new substances magnesium oxide formed during the reaction is the product
what are the changes that take place during a reaction ?
change in state
change in colour
evolution of gas
change in temperature
formation of a prespitatate
odor change
what is a skeletal chemical reaction?
a reaction where the masses of reactants and products are not equal.
what are balanced chemical reaction?
a reaction where the masses of reactants and products are equal and follow the law of conservation of masses
why should a magnesium ribbbon be cleaned before burning in air?
magnesium ribbon should be cleaned before burning it because it quickly forms the white layer of magnesium oxide which does not burn this happen when it is burned in the presence of oxygen
what is a combination reaction ?
a reaction in which a single product is formedfrom 2 or more reactants is known as a combination reaction.
what is a combination reaction ?
In combination reaction a single reactant is breaked down to form 2 or more products.
what is a displacement reaction ?
a reaction in which one reactant displaces the other from the solution this is called a displacement reaction
what is double displacement reaction ?
reactions in which there is a exchange of ions between the reactants are called double displacement reaction.
when can say that achemical reaction has taken place?
whenever a chemical change takes place we can say that a chemical reaction has taken place.
how does a magnesium ribbon burn ?
magnesiu ribbon burns with a dazzling white flame and changes into a white powder.
what is combination reactions ?
when two or more substances (elements or componds) combine to form a single product the reactions are called combination reactions.
what are exothermic chemical reactions?
reactions in which heat is released along with the form of products are called exothermic chemical reactions.
what is meant by decomposition reaction
when a single substance (elements or compouds ) is broken down to form two or more substance is called decomosition
