امتحان الميدتيرم

Copper is part of the bronze alloy in a percentage of ...........%

• 5

• 10

• 95

• 99

The metallic bond is the attractive force between............

• positive metal ions and negative valence electron cloud

• negative metal ions and positive valence electron cloud

• non-metal atoms and electron cloud

• negative electrons and negative ions

The common property between sodium and copper is

• color

• density

• melting point

• physical state

The element ................ has no luster and conducts electricity well

• Na

• Cu

• Mg

• C

Increasing the number of valence electrons in metals leads to.............

• decreased melting point

• inability to be hammered, drawn, and shaped

• weak electrical conductivity

• increased strength of the metallic bond

Element X has a melting point of C1046 and a boiling point of C2807. Which of the following is a property of this element ........

• poor electrical conductivity

• malleable

• brittle

• opaque

Which of the following ions increases in proportion when basic oxides are added to water ..........

• hydrogen

• nitrate

• sodium

• hydroxide

The total charge of any molecule ...................

• 1

• 2

• zero

• -1

All the following acids do not contain oxygen except........

• stomach acid

• hydrobromic acid

• hydrofluoric acid

• nitrous acid

The sulfate ion is similar to the phosphate ion in the number of ...................

• negative charges

• oxygen atoms

• positive charges

• sulfur atoms