Which of the following are found immediately next to the skull?

• A. I
• B. II
• C. III
• D. IV

Which of the following acids is dibasic?

• A. Hydrochloric acid
• B. Trioxosulphate (IV) acid
• C. Dioxonitrate (lll) acid
• D. Ethanoic acid

Use the following energy profile diagram to answer Questions (a) to (c) below.

(a) From the diagram, determine the value of the; (i) enthalpy of the reaction (ii) activation energy of the reaction.

(b) State whether the profile diagram is for an endothermic reaction or an exothermic reaction.

(c) What name is given to substances which can provide an alternative pathway for the reaction?

The main function of limestone in the blast furnance is to

• A. act as a reducing agent
• B. act as a catalyst
• C. remove impurities
• D. supply carbon (IV) oxide

Which of the following compounds is an alkanoate?

• A. CH₃COOH
• B. CH₃COOCH₃
• C. CH₃CH₂OH
• D. CH₃CH₂COOH

What is the state of matter in which particles are widely spaced and move freely with high kinetic energy?

• A. Liquid
• B. Solid
• C. Plasma
• D. Gas

What quantity of electrons is lost when one mole of iron (II) ions is oxidized to iron (III) ?

• A. 0 mole
• B. I mole
• C. 2 moles
• D. 3 moles

The complex compound formed by the combination of two elements with a large electronegativity difference is likely to be

• A. polar covalent
• B. giant molecular
• C. covalent
• D. ionic

In the periodic table, what is the property that decreases along the periodic and increases down the group?

• A. Atomic number
• B. Electron affinity
• C. Ionization potential D. Atomic radius C. Ionization potential
• D. Atomic radius

Elements with high ionization energies would-------

• A. lose electrons easily
• B. have large atomic radii
• C. have high effective nuclear charges
• D. have low atomic numbers