Answer:
1. Gases can be easily liquefied into very small volumes and stored in liquid form Eg in LPGA cylinders and used in homes.
2. Balloons can be easily filled with air.
A double replacement is when the reactants switch with their opposite charge. For example, AB + CD = AD + BC.
In this case the given is K2SO4 + Pb(NO3)2 = ____ + ____
The answers is PbSO4 and KNO3 would expect the products of this reaction.
Combustion of any hrdrocarbon yields carbon dioxide and water such that the hydrogen and carbon are derived from the hydrocarbon.
1 mole of carbon dioxide has a mass out of which 12 g is the mass of carbon, therefore, 3.38 g of carbon will contain (3.38 × 12)/44 = 0.922 g of carbon.
Thus, since the hydrocarbon has a mass of 1 g, then the mass of hydrogen will be (1-0.922 g) = 0.078 g.
To get the empirical formula we divide the mass of each element by the atomic mass to get the number of moles.
Carbon= 0.922/12 = 0.0768 moles
Hydrogen = 0.078/1 = 0.078 moles
Then we get the ratio of the moles of carbon : hydrogen
= 0.0768 : 0.078
= 1 : 1.016
≈ 1: 1
Therefore the empirical formula of the hydrocarbon will be CH
<u>Answer:</u> The standard potential for the given cell is 0.89 V
<u>Explanation:</u>
The standard reduction potentials for zinc and copper are:
The substance having highest positive 
potential will always get reduced and will undergo reduction reaction. Here, copper will undergo reduction reaction will get reduced.
Zinc will undergo oxidation reaction and will get oxidized.
Oxidation half reaction: 
Reduction half reaction: 
Oxidation reaction occurs at anode and reduction reaction occurs at cathode.
To calculate the 
of the reaction, we use the equation:
Putting values in above equation, we get:
Hence, the standard potential for the given cell is 0.89 V
