CO2 (s) + CO2 (g)
This is a physical change because only the state of matter changes, not the chemical makeup.
Answer:
The balanced chemical equation :
Explanation:
When calcium hydroxide reacts with hydrochloric acid it gives calcium chloride and water as a products. The chemical equation is given as:
According to question, solid calcium hydroxde is added to 38.0 mL of 0.410 M of HCl solution, so the chemical equation can be written as:
According to stoichiometry, when 1 mole of solid calcium hydroxide reacts with 1 mole of hydrochloric acid to gives 1 mole of aqueous calcium chloride and 1 mole of water.
Answer and Explanation:
- In spontaneous reactions, activation energy (Ea) of the forward reaction is less than that for the same reaction running in the reverse direction.
- Firstly, The activation energy <em>is the minimum energy requirement for the reacting molecules to initiate the reaction.</em> <em>It is the potential energy difference between the activated complex and the reactants on the energy profile diagram.</em>
- Spontaneous reactions are mainly exothermic reactions and are represented on the energy profile diagram as shown in <em>the attached image.</em>
- <u><em>The forward reaction looks like: </em></u>Reactants (A) → products (B) + heat
As the spontaneous reaction (exothermic), the energy of the products is lower than that of the reactants.
The difference in energy between reactants and products is the enthalpy change of the reaction (ΔH).
The activation energy (Ea) of the forward direction is the difference between the energy of the the activated complex state and the reactants state.
- <u><em>In the case of the reverse direction:</em></u> B + heat → A
In the reverse direction we need a supply of energy because the reaction is converting from a more stable state (low energy) to a lower stable state (high energy).
The supply in the reverse direction is ΔH, the amount of heat released in the forward direction.
Here, the activation energy of the reverse direction will be <em>(Ea of the forward direction + ΔH)</em>.
The difference between the Ea of the reverse and forward direction is ΔH.
Ea reverse = Ea forward + ΔH.
<em>So, in spontaneous reactions, the value of the Ea of forward direction is lower than the same reaction running in the reverse direction.</em>
Answer:
How does an organisms DNA determine it's chances of survival:
Organisms with heritable (genetically determined) features that help them survive and reproduce in a particular environment tend to leave more offspring than their peers. If this continues over generations, the heritable features that aid survival and reproduction will become more and more common in the population
How does humans manipulate DNA of organisms to be benefit themselves:
Biotechnology is the use of biological techniques and engineered organisms to make products or plants and animals that have desired traits.
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