Answer:
D. the forward reaction will have a lower activation energy than the reverse reaction.
Explanation:
An exothermic reaction is one which is accompanied by the release of heat energy. In this case the products have a lower energy than that of the reactants.
Activation energy is the minimum amount of energy required to initial or start a chemical reaction. In exothermic reactions, the reactants are at a higher energy (relative to the products) to begin with. Hence, they would require a lower activation energy to overcome the energy barrier in order to form the products.
D is the answer its Atoms are mostly empty space with small, dense, positively charged centers.
To determine the number of moles of carbon dioxide that is produced, we need to know the reaction of the process. For the reaction of HCl and sodium carbonate, the balanced chemical equation would be expressed as:
2HCl + Na2CO3 = 2NaCl + H2O + CO2
From the initial amount given of sodium carbonate and the relation of the substances from the balanced reaction, we calculate the moles of carbon dioxide as follows:
0.2 moles Na2Co3 ( 1 mol CO2 / 1 mol Na2Co3 ) = 0.2 moles CO2
Therefore, the amount in moles of carbon dioxide that is produced from 0.2 moles sodium carbonate would be 0.2 moles as well.
Answer:
4. The carbon in the ocean circulates through the water and is released by anaerobic respiration.
Explanation:
Carbon cycle involves the transfer of carbon between the atmosphere (air) hydrosphere (water), biosphere (living organisms) etc. Carbon in form of carbon dioxide enters into water bodies e.g ocean via diffusion, which is used by aquatic plants for photosynthesis.
The carbon dioxide is then released when some set of living organisms undergo anaerobic respiration. Hence, carbon in the ocean circulates through the water and is eventually released into the atmosphere when organisms undergo respiration.