Share concept 2.2 grade 6
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(write the scientific term) A form of energy that gained or lost by the matter to change its state
thermal energy
(Write the scientific term) The mass of a substance doesn't change when this substance changes from one state into another
law of conservation of mass
(Give reason) The mass of ice cubes before melting equals to their mass after melting
because the mass of ice doesn't change when it melts from solid state to liquid state according to the law of conservation of mass
(What happens if ...) increasing the time of contact between two objects with different temperatures
the speed of heat transfer increases
(write the scientific term) the way by which the heat is transferred through solids only
conduction
(write the scientific term) the way by which the heat is transferred through liquids and gases
convection
(write the scientific term) the way by which the heat is transferred through gases and space
radiation
When mixing two substances with different temperatures, they reach the same temperature at ...........................
thermal equilibrium
The materials that allow thermal energy to transfer through are called ..........................., while the materials that resist the transfer of thermal energy are called.........................
thermal conductors - thermal insulators
(Give reason) the vibration of molecules of a matter increases when it becomes warmer
because the molecules gain thermal energy and kinetic energy increases
