Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

Nitrogen and hydrogen react together to form ammonia.$N_2 + 3H_2 \rightarrow 2NH_3$When completely converted, 7 tonnes of nitrogen gives 8.5 tonnes of...

2009 Summer

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

Which relative molecular mass, $M_r$, is \textbf{not} correct for the molecule given?[Table_1]

2009 Summer

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

Nitrogen and hydrogen react together to form ammonia. $$N_2 + 3H_2 \rightarrow 2NH_3$$ When completely converted, 7 tonnes of nitrogen gives 8.5 ton...

2009 Summer

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

Which relative molecular mass, $M_r$, is not correct for the molecule given?[Table_1]molecule$M_r$Aammonia, $NH_3$17Bcarbon dioxide, $CO_2$44Cmethane,...

2009 Summer

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

For each atom of carbon present in a molecule, there is an equal number of atoms of oxygen but twice as many atoms of hydrogen.What is the formula of ...

2009 Winter

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

Water is formed when 48 g of oxygen combine with 6 g of hydrogen.What mass of oxygen combines with 2 g of hydrogen?A 12 gB 16 gC 96 gD 144 g

2009 Winter

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

For each atom of carbon present in a molecule, there is an equal number of atoms of oxygen but twice as many atoms of hydrogen.What is the formula of ...

2009 Winter

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

Water is formed when 48 g of oxygen combine with 6 g of hydrogen.What mass of oxygen combines with 2 g of hydrogen?A. 12 gB. 16 gC. 96 gD. 144 g

2009 Winter

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

Hydrogen and chlorine react as shown.What is the equation for this reaction?A. $2H + 2Cl \rightarrow 2HCl$B. $2H + 2Cl \rightarrow H_2Cl_2$C. $H_2 + C...

2010 Summer

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

Hydrogen and chlorine react as shown.1 molecule of hydrogen + 1 molecule of chlorine \( \rightarrow \) 2 molecules of hydrogen chlorideWhat is the equ...

2010 Summer

Theory

CH15 - AIR AND WATER

This question is about the first 30 elements in the Periodic Table. Name the element which: (a) is 78% of clean, dry air ................................

2022 Spring

Theory

CH4 - ATOMS COMBINING

(a) Add the missing state symbols to the chemical equation for the reaction.MgCO$_3$ ..... + 2HCl ..... $\rightarrow$ MgCl$_2$(aq) + H$_2$O ..... + CO...

2022 Spring

Theory

CH15 - AIR AND WATER

Nitrogen dioxide, NO$_2$, is an atmospheric pollutant and is formed in car engines.(a) Explain how nitrogen dioxide is formed in car engines.............

2022 Spring

Theory

CH13 - THE BEHAVIOR OF METALS

This question is about chemical reactions and electricity.(a) The diagram shows the apparatus used in the production of electrical energy in a simple ...

2022 Spring

Theory

CH17 - ORGANIC CHEMISTRY

This question is about alkanes and alkenes.(a) Short-chain alkanes and alkenes can be formed from long-chain alkanes in a chemical reaction.(i) Name t...

2022 Spring

Theory

Plastics

The names of four esters are listed. methyl propanoate ethyl propanoate propyl propanoate butyl propanoate (a) Esters are a family of organic...

2022 Spring

MCQ

CH1 - STATES OF MATTER

Which two gases will diffuse at the same rate, at the same temperature?

2022 Summer

MCQ

CH1 - STATES OF MATTER

A student measures the time taken for 2.0 g of magnesium to dissolve in 50 cm\(^3\) of dilute sulfuric acid. Which apparatus is essential to complete ...

2022 Summer

MCQ

CH3 - ATOMS AND ELEMENTS

The numbers of protons and neutrons and the electronic structures of four particles, W, X, Y and Z, are shown.[Table_1]Which particles have the same c...

2022 Summer

MCQ

CH3 - ATOMS AND ELEMENTS

Which substance should be pure for the intended use?

2022 Summer