بوابة الثانوية العامة المصرية - اختبار (بسيط) !!! لشهر أكتوبر

Revesion

1) Put ( right ) & ( wrong ) in front of these statement and correct the wrong one : -

1- Carbon is found in petroleum oil , saccharides and chiorophyll.

2- The chemical formula for Epsom salt is magnesium sulphate.

3- the elements exist in the same period have similar properties.

4- silver bromide is used in cooking utensils industry.

5- chlorine gas can undergoes sublimation process.

Write one importance for each of the following:-

1- Metalloids…………………………………………………………………………………………………………

2- Gieger counter …………………………………………………………………………………………..

Give reasons for :-

1- Semi-metallic elements are called semi-conductors.

2-Elements in group ( 1a ) are not founding elementary state.

3-Chlorine cl17 is monovalent , while magnesium Mg12 is divalent.

Mr.mohamed abo-mosalam