Model in which electrons are found in fixed levels around the nucleus and require energy to move from level to level:

a.

Bohr model

c.

Quantum mechanical model

b.

Rutherford model

d.

Free-electron model

Calculate the molar solubility of Ni (OH) 2 in water. Use 2.0 * 10^-15 as the solubility product constant of Ni (OH) 2.

The term meniscus refers to O A) a type of glassware used to measure volume OB) the curved surface of a liquid being measured OC) a common error made when using a stopwatch OD) the part of a microscope that magnifies the sample

Marissa is learning about the unique properties of waves. She has learned that whenever the wavelength of a wave increases, the frequency of the wave decreases.

What has 20 electrons in 44 Mass

Identify the applications for gel filtration chromatography. separation of components in a mixture by size estimation of molecular weights separation of components in a mixture by hydrophobicity purification of a specific protein from a mixture

A student makes observations when water is added to a blue solution of copper sulfate. The student makes only 1 observation: the solution changes to a lighter shade of blue. Is this an example of a chemical reaction? Explain your reasoning.

When dos the spring tide occur

As ice transforms into steam, Question options: new molecules are formed. the types of atoms are changed. energy is absorbed by the molecules. the mass of the molecules is increased.

Why do chemists consider the periodic table so useful?

Plates include large sections of Earth Oceanic or Continental