UI Chemistry 2015/2016 Past Questions

The symbol of an isotope is $^{57}_{26}Fe$ Which gives the correct numbers of protons, neutrons and electrons in this atom?

An atom can turn into an ion if it

A substance has an ionic structure. It conducts electricity when molten but not when solid. The substance could be?

Which of the following substances consists of small molecules?

Which of the following is true as a liquid changes to a gas in evaporation?

The mass number of an element is?

When ammonium nitrate is added to water, an endothermic reaction occurs and

Chromium has four stable isotopes 4.31% Cr-50, 83.76%, 9.55% cr-53 and 2.38

Given the Equation to show the formation of iron sulphide: Fe + s ⇒ FeS. Calculate The mass in g of iron sulphide formed when 5.6g of iron combines with 3.2g of sulphide.(Fe = 56 and S = 32)

What is molarity of the solution formed by dissolving 10g of sodium hydroxide (NaOH) in 500cm³ of Water?(Na = 23, O = 16, H = 1)

0.145g of a gas had a volume of 60cm³. What is the molecular mass?(1 mol gas = 24dm³ at STP.)

when a reactant breaks down to give two or more products, we call this type of reaction:

The number of molecules in 4.25g of ammonia is approximately

Which of the following metals is extracted only by electrolysis?

Which of these blast furnace reactions forms the 'slag'?

which following is true about the trend Down the group 7 Halogens with increase in atomic number?

Which of the following is the pH of a strong alkali?

In an electrolytic cell the electrode at which the electrons enter the solution is called the ......; The chemical change that occurs at the electrode is call -----

the ionic radii of metals are usually

The energy required to remove the most bound electron in a gaseous atom is

A substance is said to be pure if

Which of the following processes is a physical change?

The maximum number of electrons that can be accommodated in the shell with principal quamtum number 3 is

In the reaction represented by the following equation:H₂S_(g)+SO_2(s)→H₂O_(l)+S_(s) is acting as

What mass of copper would be deposited by the liberation of Cu²⁺ when 0.1F is passed through an aqueous solution of a coppr(II)salt?(Cu = 64)