An atom has 5 protons and 7 neutrons. What is its mass number of amu?

The mass of the ocean is about 1.8 1021 kg. if the ocean contains 1.076% by mass sodium ions, na+, what is the mass in kilograms of na + in the ocean?

You burn a piece of paper. After burning the paper, you find the mass of the remaining ash. The mass of the ash does NOT equal the mass of the paper you started with. How can you account for the different in mass? Where could it have gone?

3) One lab section accidentally used Ba (OH) 2 instead of Ca (OH) 2 when they performed this experiment. The TA told them that the Ksp of Ba (OH) 2 is 2.55 x 10-4. What is the molar solubility of Ba (OH) 2

Write examples of alkane, alkene, cycloalkane, haloalkane, aromatic compound, alcohol, thiol, ether, aldehyde, ketones, carboxylic acid, ester.

What is the name of this molecule? CH2 - CH2 - CH3 | CH3 - CH2 - CH - CH2 - CH = CH3

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.

Which answer choice best explains why uranium-238 can be used in power plants to generate electricity? A) Nuclides of uranium-238 decay over time. They release large amounts of energy as their nuclei break apart.

Explain how you can use physical properties to compare substances.

How is this model useful?

What is the frequency of a wave? A. The amount of time that one full cycle takes B. The distance traveled by the wave during one full cycle C. The amount of cycles that occur in a given time D. The distance from the beginning to the end of a cycle