Rate of Reaction and Chemical Bond

Which two elements react together to form ionic compound?

• R and T

• T and X

• X and Z

• Z and R

Element X forms an acidic, covalent oxide.

Which rows shows how many electrons there could be in the outer shell of an atom of X?

• A

• B

• C

• D

Which diagram does not show the outer shell electrons in the molecule correctly?

• A

• B

• C

• D

The apparatus sown can be used to measure the rate of some chemical reactions.

• 1 & 2

• 1 & 3

• 2 & 4

• 3 & 4

A student investigate the rate of reaction between magnesium and excess sulfuric acid. The volume of hydrogen given off in the reaction is measured over time. Which change in conditions would cause the difference between R and S?

The graph shows the results of two experiments, R and S.

• A catalyst is added in S

• The acidic is more concentrated in R than in S

• The Mg is less finely powdered in R than in S

• The temperature in R is lower than in S

Iron is a metal. The structure of iron is described as lattice of positive ions in a sea of electrons.

Which of the following statements about iron is correct?

(1) Iron conduct electricity because the electrons are free to move.

(2) Iron has a high melting point due to the strong covalent bond.

(3) Iron is an alloy.

(4) Iron is malleable because the layers of atoms can slide over one another.

• 1

• 1 & 3

• 1 & 4

• 2, 3, 4

Ethene is an unsaturated hydrocarbon. Which description of the bonding in ethane is correct?

• All atoms in the molecules have a share of eight electrons.

• Each carbon atom shares two of its electrons with hydrogen atoms and two of its electrons with a carbon atom.

• Each carbon atom shares two of its electrons with hydrogen atoms and one of its electrons with a carbon atom.

• The two carbon atoms share a total of six electrons with other atoms.

Ionic bond is formed by giving and taking electron from…. to ….

• metal to metal

• non-metal to non- metal

• non- metal to metal

• metal to non- metal

Covalent bond is formed by sharing electron of ...… .

• metal to metal

• non-metal to non- metal

• non- metal to metal

• metal to non- metal

The bond that will formed by Ca and O is … bond.

• covalent

• ionic

• metallic

• non metallic