Complete:When a piece of wood is put into a fire and starts to burn, ......................energy starts to decrease.
chemical energy.
Write the electronic configuration , its chemical activity.
2,8 ,8,1 / Active
Complete: ........................is used for making heating coils, while .....................is used for making jewels.
nickel - chrome / copper- gold
Explain: Solar energy can be changed into other energies.
chemical, kinetic, electric, heat.
Give 2 example of solutions tat are bad electric conductors.
Sugary solution, Hydrogen chloride in benzene
GR: Energy level "L" is filled with electron before energy level "M".
because "L" has less energy than "M"
Complete: At the maximum height of the object, the ....................vanished.
K.E
Which change in state is shown in the diagram?
Melting
What happens to the K.E when doubling the speed of an object and decrease of the speed to the half
K.E increases to the double.
GR: Sodium must be kept under kerosene surface?
to prevent their reaction with atmospheric oxygen
An atom contains 10 electrons. How many of these electrons occupy the "M" energy level?
zero
What is this element? is it monoatomic or diatomic?
Argon, Monoatomic
Complete according to the figure: During the process of condensation, the change happens from ...........to...............
c / b
Write the symbols of : Lead, Gold, Helium
Pb, Au, He
What is the idea of operation of simple electric cell?
to change the chemical energy into electric energy
Which form of energy does a substance usually gain or lose to undergo a change of state?
Thermal energy
How does the solar energy reaches from The Sun to Mars planet?
Radiation
GR: Ecologist s don't appreciate all the technological application which is used in energy transformation.
Negative effect
An atom of phosphorus has the chemical symbol 3 1 1 5 P .What is the atomic number,mass number, no.of electron, no of neutron.
15, 31, 15, 16