Differentiate between the following
a. Melting and freezing
b. Vaporization and condensation
c. Elements and compounds
d. Expansion and contraction
e. An atom and a molecule
Answers
Answer:
Solids and liquids can be changed from one state to another by heating or cooling. Heat melts a solid and turns it into a liquid. Cooling freezes a liquid into a solid.
Freezing: the substance changes from a liquid to a solid. Melting: the substance changes back from the solid to the liquid. Condensation: the substance changes from a gas to a liquid. Vaporization: the substance changes from a liquid to a gas.
Compound Element
Definition A compound contains atoms ofThe increase in size of an object on heating is called expansion whereas the decrease in size of an object on cooling is called contraction. different elements chemically combined together in a fixed ratio. An element is a pure chemical substance made of same type of atom.
According to science atom is the smallest unit of an element that can or cannot exist freely. While on the other hand, a molecule is a set of atoms that are held together with the help of a bond and is the smallest unit of a compound. ... Moreover, an atom contains a nucleus (made up of neutrons and protons) and electrons.
Answer:
A. The process of a solid becoming a liquid is called melting (an older term that you may see sometimes is fusion). The opposite process, a liquid becoming a solid, is called solidification. For any pure substance, the temperature at which melting occurs—known as the melting point—is a characteristic of that substance.
B.Condensation is the change from a vapor to a condensed state (solid or liquid). Evaporation is the change of a liquid to a gas.
C.Elements are pure substances which are composed of only one type of atom. Compound are substances which are formed by two or more different types of elements that are united chemically in fixed proportions. There are nearly 118 elements (at present) of which nearly 94 occur naturally on Earth
D.The increase in size of an object on heating is called expansion whereas the decrease in size of an object on cooling is called contraction
E.According to science atom is the smallest unit of an element that can or cannot exist freely. While on the other hand, a molecule is a set of atoms that are held together with the help of a bond and is the smallest unit of a compound.
Explanation: