There is no more than 1 sigma bond between any two atoms.
Molecules with rings have supplementary sigma bonds, such as benzene rings,
which have 6 C−C
sigma bonds within the ring for 6 carbon atoms. The anthracene molecular
formula is C14H10, it has three
rings so that the rule contributes the number of sigma bonds as 24 added with 3
is 27, which will be subtracted with 1 which will give 26.
There are 0.31 mol in h3po4
Answer:
I can't see any picture?????
Answer:
1. A solid has a definite volume and a shape.
2. Liquids take on the shape of their container and will fill the lowest portion of the container, taking on the shape but not the volume.
3. It may take extreme temperature, pressure or energy but all the matter can be changed.
4. Through sublimation, a substance changes from a solid to a gas without even passing through the liquid phase.
<h2>The required "option is d)".</h2>
Explanation:
- Remineralization of enamel is a natural process and is of the same color.
- The saliva contains calcium, phosphate, and fluoride which helps in the neutralisation of acids present in food.
- Remineralization helps in improving the strength and functioning of the tooth by replacing calcium ions and flouride ions which were removed by demineralization.
- It helps in prevention of cavity formation in teeth and strengthens the teeth by replacing loss of calcium ions, phosphate ions, and fluoride by fluorapatite crystals that are more resistant to acids.
- Hence, the remineralized crystal is more resistant to acids.
