The is inversely proportional to the wavelength and reported in reciprocal centimeters (cm−1). A technique used for measuring the molecular weight and determining the molecular formula of an organic molecule is . A compound that contains an odd number of atoms gives a molecular ion an odd mass. When the molecular ion consists of two peaks (M and M+2) in a 1:1 ratio, a atom is present in the molecule. For a bond to absorb in the IR, there must be a change in the dipole moment during the . Organic chemists use to identify the functional groups in a compound. When the molecular ion consists of two peaks (M and M+2) in a 3:1 ratio, a atom is present in the molecule. The higher the percent s-character, the strong the bond, and the the wavenumber of an IR absorption. Hydrocarbons and compounds that only contain C, H, and O atoms always have a molecular ion with an mass.

Please see below in the explanation column for answers

Explanation:

-The WAVENUMBER is inversely proportional to the wavelength and reported in reciprocal centimeters (cm−1).

- A technique used for measuring the molecular weight and determining the molecular formula of an organic molecule is __MASS SPECTOMETRY .

-A compound that contains an odd number of N atoms gives a molecular ion an odd mass.

-When the molecular ion consists of two peaks (M and M+2) in a 1:1 ratio, a ___Br, Bromine atom is present in the molecule.

-For a bond to absorb in the IR, there must be a change in the dipole moment during the __VIBRATION .

-Organic chemists use iNFRA RED SPECTROSCOPY to identify the functional groups in a compound.

-When the molecular ion consists of two peaks (M and M+2) in a 3:1 ratio, a Cl , chlorine atom is present in the molecule.

- The higher the percent s-character, the strong the bond, and the HIGHER the wavenumber of an IR absorption.

-Hydrocarbons and compounds that only contain C, H, and O atoms always have a molecular ion with an __ EVEN mass.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e