Answer:
1) Rosa needs glucose from the food she ate and oxygen from the air she breathes
2) She firstly undergird digestion, which breaks down the food into glucose. The glucose is absorbed by each cell
3) Her cells produce energy via the process of cellular respiration
Explanation:
To perform any activity, cellular energy in form of ATP is needed. However, this energy is derived via a process called CELLULAR RESPIRATION, which uses the products of digestion of the food we eat and oxygen.
According to this question, Rosa eats a peanut butter sandwich for lunch and plans to go for a run later in the afternoon.
1) To get energy which is needed for her run, Rosa needs glucose from the peanut butter sandwich she ate and oxygen from the air she is breathing to synthesize this energy.
2) The peanut butter sandwich first undergoes digestion i.e. breakdown into glucose, which is then absorbed by her cells in order to use. Oxygen from air is taken in by the lungs and diffused into her cells. In a nutshell, digestive system and respiratory system works together to carry out this task.
3) The cells use the oxygen and glucose in a process called CELLULAR RESPIRATION to produce energy (ATP). This occurs in three stages namely: glycolysis (occurs in the cytoplasm), Krebs cycle and oxidative phosphorylation, which both occurs in the mitochondria.
Evidence for evolution reveals that closely related organisms have many similar physical and genetic characteristics.
Explanation:
Closely related organisms have similar physical features and genetic sequences.
When both the physical and genetic features are similar, these organisms are referred to as homologous structure.They are similar, as their evolutionary path is the same.
Example: bones from the birds and arms of the humans, have evolved more or less similarly so they are homologous structure.
In other cases, the organisms might be closely related, but their genetic structure might have a slight change. Due to this change there might be difference in the physical structure.
Example: the chimpanzee and human have different physical structure even though their evolution have taken the same path and they are closely related.
Atomic number is 8 and atomic mass is taken as 16 amu
Correct Question:
A chemist measures the enthalpy change ΔH during the following reaction: Fe(s) + 2HCl(g)-->FeCl2(s) + H2 ΔH=-157.0 kJ. Use this information to complete the table below. Round each of your answers to the nearest kJ/mol
Answer:
-314 kJ
+628 kJ
+157 kJ
Explanation:
The enthalpy change of a reaction measures the amount of heat that is lost or gained by it. If ΔH >0 the heat is gained, and the reaction is called endothermic, if ΔH<0, the heat is lost, and the reaction is called exothermic.
If the reaction is inverted, the value of ΔH is inverted too (the opposite endothermic reaction is exothermic), and if the reaction is multiplied by a constant, ΔH will be multiplied by it too.
1) 2Fe(s) + 4HCl --> 2FeCl2(s) + 2H2(g)
This reaction is the product of the given reaction by 2, so
ΔH = 2*(-157) = -314 kJ
2) 4FeCl2(s) + 4H2(g) --> 4Fe(s) + 8HCl(g)
This reaction is the inverted reaction given multiplied by 4, so
ΔH = 4*(157) = +628 kJ
3) FeCl2(s) + H2(g) --> Fe(s) + 2HCl
This reaction is the inverted reaction given, so
ΔH = +157 kJ
Answer:
it tells us of the specific amount of energy required to change the state of one mole of a substance either from solid to liquid or liquid to gas and vice versa without change in temperature
