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chemistry
chemical reactions part -a
19
Chemistry
8th Grade
11/14/2021

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Term
what is a chemical reaction?
Definition
Any chemical change in matter which involves transformation into one or more substances with entirely different properties called a chemical properties is a chemical reaction
Term
what happens during a chemical reaction?
Definition
a chemical reaction involves breaking of chemical bonds between the atoms or group of atoms of reacting substances and rearrangement of atoms making new bonds to form new substances with absorption or release of energy
Term
what is a chemical bond?
Definition
a chemical bond is the attractive force that holds the atoms of a molecule together in a compound
Term
how are chemical reactions represented?
Definition
chemical reactions are represented by chemical equations.the substance taking part in a reaction are called reactants and the new substances formed are called products
Term
sodium hydroxide reacts with dilute hydrochloric acid to form ?
also represent it
Definition
sodium hydroxide reacts with dilute hydrochloric acid to form salt and water .[image]
Term
what are the characteristics of a chemical reaction?
Definition
The characteristics of a chemical reaction are: Evolution of gas, Formation of a precipitate, Change in colour, Change in temperature, Change in state
Term
define effervescence?
Definition
Effervescence is the formation of gas bubbles in a liquid by a chemical reaction. An example of effervescence is the release of carbon dioxide which bubbles as a gas from the liquid when limestone chips, which are composed of calcium carbonate, are added to dilute hydrochloric acid.
Term
what happens when zinc reacts with dilute sulphuric acid?
Definition
Term
what happens when potassium chlorate is heated strongly ?
Definition
Term
what happens when sodium sulphite is treated with dilute hydrochloric acid?
Definition
Term
change in colour
Definition
change in colour examples
Term
what will happen if we put a few pieces of iron are dipped into a blue coloured copper sulphate solution?
Definition
Term
what will happen when blue coloured copper sulphate reacts with hydrogen sulphide gas?
Definition
Term
what happens if solid lead nitrate is heated ?
Definition
Term
define precipitate ?
Definition
Term
change in precipitates
Definition
change in precipitate examples
Term
what will happen if a solution of silver nitrate is added to solution or sodium chloride ?
Definition
Term
what happens when ferrous sulphate solution is added to sodium hydroxide solution ?
Definition
Term
what will happen if we add a few drop of dilute sulphuric acid is added to barium chloride solution?
Definition
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