General exam on uint 1

If you have elements Na, Al, He

1) which of them does not rust?

2)which of them kept under kerosene surface?

3)which of them have 3 electrons in the outer most energy level?

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The opposite figure represents the atom beryllium element, which it's sumbol is

• 9 Be 4

• 5 Be 4

• 4 Be 9

• 9 Be 5

On heating the solid substance......

• Speed of molecules decreases

• Speed of molecules increases

• Intermolecular spaces among molecules decreases

• Intermolecular force among molecules increases

The symbol of potassium is...

• Na

• Pa

• P

• K

All the molecules of any substance are characterized by all the properties except...

• Continuous motion

• High melting point

• Enter molecular spaces

• Enter molecular forces

The properties of molecules are different because molecules differs in....

• Number of atoms

• Kind of atoms

• Way of combination between atoms

• All the above

1)the symbol of calcium is..... While thw symbol of sodium is.....

.... Is the simplest form of matter which can't be analyzed into simpler form

Materials have.... Density than water sink and materials have..... Density than water float

The fundamental unit of matter is.....