Answer:
chlorophyll
Explanation:
the chlorophyll in the leaf absorbs all the colors of the radiation from sun but reflects only green colour. that is why we see green when we look at a leaf on a tree.
Based on the mass given, the value of P in the N - P - K designation is 32.
<h3>What is percentage mass composition of an element?</h3>
The percentage mass composition of an element is the mass percent ofbthe element in the the total mass of the compound.
Since the fertilizer contains 1.2 g of phosphorus as P2O5.
Molar mass of P2O5 = 142 g
mass percent of P in P2O5 = 2 × 31/142 = 43.6%
mass of P2O5 in 8.6 g fertilizer = 100/43.6 × 1.2 = 2.75 g
Mass percent of P2O5 = 2.75/8.6 × 100% = 32.0%
Therefore, the value of P in the N - P - K designation is 32.
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Answer:
The 1st law of thermodynamics and the 2nd law of themodynamics
Explanation:
The first law of thermodynamics describes the conservation of energy. It states that when heat is added to a system, it transforms to an equal amount of another form of energy. It does this by doing one or both of the following things: (1) increasing the amount of internal energy within the system; and/or (2) doing external work by leaving the system, thereby affecting the area around the system.
The second law of thermodynamics states that no reaction is completely efficient and that heat is always transferred from warmer objects to colder objects. In other words, some energy is always lost to heat in any reaction, and you'll never find heat moving from colder objects to warmer objects in a system
Answer:
3Ba(OH)₂ + 2H₃PO₄ → Ba₃(PO₄)₂ + 6H₂O
Explanation:
Neutralization reaction:
When an acid and base react they form water and salt.The reaction is called neutralization reaction.
General equation:
HX + BOH → BX + H₂O
From given reaction equations only option C is correct because only this reaction gives salt and water.
Chemical equation:
3Ba(OH)₂ + 2H₃PO₄ → Ba₃(PO₄)₂ + 6H₂O
Barium hydroxide is acting as a base. H₃PO₄ is an acid. Both these reactants react to form salt which is barium phosphate and water.
Other options are incorrect because non of these reaction produced salt and water. So option A is correct.
Answer : The correct option is C.
Explanation :
Chemical change : It is defined as a change in which a new compounds are formed by the chemical reaction. Changes occurs in their chemical composition and properties.
The molecular structure of a substance changes in a chemical reaction is a chemical change.
- Change in molecular structure means that there is a breaking and formation of bonds in a molecule.
The example of chemical change in terms of change in molecular structure is the reaction of hydrogen with oxygen.
The reaction of hydrogen with oxygen is,
In this reaction, the H-H bond is break and O-H bond is form.