I. What are the conditions that affect evaporation?
II. Differentiate between physical and chemical change.
III. Explain the different types of energy needed for
different kinds of chemical changes?
IV. Explain which type of change is exhibited by a burning
candle.
V. Define controllable and uncontrollable change and give
example for each. pls fast
Answers
Answer:
Who discovered cells, and how? Why is the cell called the structural and functional unit of life?
ANSWER: 1) temperature of the liquid. A cup of hot water will evaporate more quickly than a cup of cold water.
exposed surface area of the liquid. ...
presence or absence of other substances in the liquid. ...
air movement. ...
concentration of the evaporating substance in the air.
2) Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula.
3) During Chemical reaction energy is required either for breaking up bonds in case of reactants and building bonds to form products. ... The chemical reaction in which energy is absorbed is called endothermic reactions, in which energy is absorbed for breaking up the bonds.
4) When a candle burns, both physical and chemical changes occur. Physical Changes: On heating, candle wax gets melted. Since it again turns into solid wax on cooling. So, the melting of wax and vapourisation of melted wax are physical changes.
5) Controllable and uncontrollable factors of international marketing. Controllable factor - often called as "Marketing Mix". It includes: Product, Price, Place and Promotion. Uncontrollable factors- often called as "Environmental Factors“ which are out of control.
EXPLANATION:
Hope it helps you