Answer:
The structures are shown below.
Explanation:
The conjugate base of an acid is the base that is formed when the acid lost a proton (H⁺) in a solution. For a generic acid, HA, the conjugate base is A⁻.
The pyrrole is a base that has a ring with 4 carbons and 1 nitrogen and double bonds between carbons 1 and 2 and between carbons 3 and 4. The nitrogen is between carbons 1 and 4 and has a bond with a hydrogen. When it dissociates, it can lose the hydrogen, and form the conjugate base, which is shown in the picture below. Nitrogen has 5 valence electrons, and in the conjugate base it will do 2 bonds, so it will have 2 lone pairs and 1 free electron.
The cyclopentadiene is formed by a ring of 5 carbons and has double bonds between carbons 1 and 2, and between carbons 3 and 4. When in solution, one of the hydrogens attached in carbons with double bonds will be lost (because it's the more acidic hydrogen, and the structure will be more stable because of the double bond!), so the conjugate base structure is shown below.
Chemical property is the property of the substances that describes the ability of the substance to involve in chemical reactions. Physical property is that which does not change the chemical composition of the substances. The following properties of water that it is transparent and tasteless in its pure form and it freezes at a temperature of are physical properties as they simply indicate the change in physical state without any change in chemical composition of water.
The other two properties that water reacts with halogens to form oxygen gas as one of the products and water decomposes to form hydrogen and oxygen are chemical properties as the chemical composition of water changes in the given reaction.
Therefore the correct answer is b. 1 and 4
Answer: E. trigonal planar
Explanation:
The trigonal planar geometry is made up of 3 equally spaced sp2 hybrid orbitals arranged at angle 120° to each other, The molecule are electron deficient and does not follow octet rule. Therefore, a molecule containing an sp2 hybrid central atom has a trigonal planar geometry e.g boron hydride (BH3)
Mass because an intensive property is a physical quantity whose value does not depend on the amount of the substance for which it is measured. Examples of extensive properties include: volume, mass, size, weight, and length.