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

MCQ

CH1 - STATES OF MATTER

The rate of diffusion of two gases, methane, CH₄, and ethene, C₂H₄, is measured using the apparatus shown.Which gas diffuses faster and why?

2016 Summer

MCQ

CH2 - SEPARATING SUBSTANCES

A sample of a dye is investigated by chromatography. A line is drawn across a piece of chromatography paper and a spot of the dye is placed on it.The ...

2016 Summer

MCQ

CH2 - SEPARATING SUBSTANCES

The paper chromatogram below was obtained from four different dyes.Which dye has an $R_f$ value of 0.7?

2016 Summer

MCQ

CH3 - ATOMS AND ELEMENTS

Which statements about isotopes of the same element are correct?1. They are atoms which have the same chemical properties because they have the same n...

2016 Summer

MCQ

CH4 - ATOMS COMBINING

The table shows the electronic structure of four atoms.[Table_1]atom | electronic structure---- | ------------------- W | 2,8,1 X | 2,8,4 Y | 2,...

2016 Summer

MCQ

CH4 - ATOMS COMBINING

Which statement describes the attractive forces between molecules (intermolecular forces)?

2016 Summer

MCQ

CH4 - ATOMS COMBINING

The diagram represents the general structure of a solid Z. What is Z?

2016 Summer

MCQ

CH6 - USING MOLES

A compound, X, contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen by mass.The relative molecular mass, $M_r$, of X is 60.What is the molecular form...

2016 Summer

MCQ

CH11 - ACIDS AND BASES

25 cm$^3$ of 0.1 mol/dm$^3$ hydrochloric acid exactly neutralise 20 cm$^3$ of aqueous sodium hydroxide.The equation for this reaction is:NaOH + HCl $\...

2016 Summer

MCQ

CH1 - STATES OF MATTER

Which reactions could take place at the anode during electrolysis? 1. $4\text{OH}^-(aq) \rightarrow 2\text{H}_2\text{O}(l) + \text{O}_2(g) + 4e^-$ 2...

2016 Summer