Answer is: A. food chains.
Plants convert solar energy into the chemical energy of sugars (food).
Solar energy is stored in chemical bonds of sugars (glucose for example).
The overall balanced photosynthesis reaction:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.
In carbon dioxide, carbon has oxidation number +4 and in photosynthesis carbon gain electrons (solar energy), so his oxidation number is lowered (reduced). Light energy is transformed into chemical energy, that is stored in carbohydrate molecules (glucose), which are synthesized from carbon dioxide and water.
Explanation:
A property that does no change the chemical composition of a substance are known as physical properties.
For example, mass, volume, size etc are all physical properties.
Whereas a property that changes the chemical composition of a substance are known as chemical properties.
For example, reactivity, toxicity etc are all chemical properties.
Therefore, identifying the given statements as follows.
- The various components of a mixture do not combine chemically - physical property.
- Chemical properties can only be observed during a chemical reaction - chemical property.
- The rusting of iron is a chemical reaction - chemical property.
- Melting and boiling points are physical properties - physical property.
Answer:
12.78
Explanation:
pOH= -log(0.0600) = 1.22184875
pH= 14-1.22184875 = 12.78
Answer:
Approx. 20 moles of iron.
Explanation:
There are approx. 6.022 x 10.23 iron atoms per mole of iron. In this quantity, The number of iron atoms has a mass of
55.85 ⋅ g.
Carbon has 4 electrons in its outermost shell.it shows tetravalency and catination property hence forms long chain of carbon .