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

CH1 - STATES OF MATTER

The diagram shows a cup of tea. Which row describes the water particles in the air above the cup compared with the water particles in the cup?[Table_1...

2010 Summer

Theory

CH2 - SEPARATING SUBSTANCES

A fruit drink coloured orange contains a dissolved mixture of red and yellow colouring agents. One of these colouring agents is suspected of being ill...

2010 Summer

Theory

CH1 - STATES OF MATTER

A student carries out an experiment to find how fast 3 cm pieces of magnesium ribbon dissolve in 10 cm³ samples of sulfuric acid at different tempera...

2010 Summer

Theory

CH4 - ATOMS COMBINING

Which row shows the change that takes place when element X gains the new particle shown?[Table_1]Table 1| | particle gained | change || --- ...

2010 Summer

Theory

CH3 - ATOMS AND ELEMENTS

The diagram shows an atom.key𝑒 electronnucleus containing nine particlesWhat is the proton number and neutron number of the atom?[Table_1]| | ...

2010 Summer

Theory

CH3 - ATOMS AND ELEMENTS

The symbols of two atoms may be written as shown.$$^{52}_{23}\text{X} \quad {}^{52}_{24}\text{Y}$$Which statement about these atoms is correct?A. They...

2010 Summer

Theory

CH14 - MAKING USE OF METALS

Which name is given to mixtures of metals?A. alloysB. compoundsC. oresD. salts

2010 Summer

Theory

CH4 - ATOMS COMBINING

Element X has six electrons in its outer shell.How could the element react?A by gaining two electrons to form a positive ionB by losing six electrons ...

2010 Summer

Theory

CH4 - ATOMS COMBINING

In which compounds are pairs of electrons shared between atoms?1. sodium chloride2. methane3. lead bromideA 1 only B 2 only C 1 and 3 D 1, 2 and 3

2010 Summer

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