شرح الدرس الاول و الثاني substance للصف السابع

à Tiny particles
à Elements and symbols, we can show every element symbols have one or two letters
à We always write the first letter of symbol as a capital letter.

1- An absolutely pure substance that cannot be broken down into any other substance is…
A. a molecule B. an atom C. a compound D. an element

2- Many elements are named from Latin. The symbol for gold comes from Latin and is…
A. Ag B. G C. GD D. AU

3- Symbol for Sodium comes from Latin and is…

A. S B. N C. SD D. Na

4- A/an . . . . . . . . . . . . . . . : consists of a number of identical molecules or a lattice containing different atoms joined or bonded together.

A. Elements B. Mixture C. Molecule D. Compound

5- An example of chemical change is . . . . . . . . . . . . . . . .

A. ice melting B. a plate is dropped C. water boiled D. an egg cooking

Elements and Non-elements :

Brass (Copper with Zinc) (سبيكة من النحاس والزنك)
Solid (السبائك الصلبة )