The more electrons it has, the more reactive it is
Answer:
1:2:1:2
Explanation:
A molecule is made up of aggregates of small particles called atoms.
CH₄ + 2O₂ → CO₂ + 2H₂O
From the reaction above we have: 1 molecule of methane CH₄ reacting with 2 molecules of oxygen gas O₂ to produce 1 molecule of carbon dioxide gas CO₂ and 2 molecules of H₂O:
CH₄ + 2O₂ → CO₂ + 2H₂O
1 : 2 : 1 : 2
The answer is (3). To form the cation (positive ion), Cd must lose negative charge, so two electrons are lost. This loss in electrons also increases the effective nuclear charge/ reduces electron shielding. In other words, with two less electrons to hold, the nucleus exerts a stronger attractive force on the remaining electrons, so the electron cloud is pulled closer to the nucleus. The radius therefore decreases.
Molarity is calculated using the following equation:
number of moles solute/ number of litres of solvent.
Number of moles = 0.2 moles (given)
1 litre = 1000 ml
Therefore, 200 ml = 0.2 litres
Using the previously mentioned equation, we can calculate molarity as follows:
Molarity = 0.2/0.2 = 1
