An atom with an atomic number of 12 and a mass number of 25 can best be described by which of these

Calculate the product of 0.0002115m and 0.0000405m. Express the answer in scientific notation

In most elements, the valence shell holds a maximum of how many electrons? A. 2 B. 4 C. 6 D. 8

Which of the following results in a chemical change in matter building a strong braiding hair or boiling water or Burning wood

An acorn with a mass of 0.0300 kilograms falls from a tree. What is its kinetic energy when it reaches a velocity of 5.00 m/s?

A substance made of metal atoms only?

1. How is pressure affected as depth increases? 2. As the sun heats the surface of the oceans, two layers of water result. What separates the layers? 3. How is temperature affected when? (a) the depth increases (b) the latitude increases 4.

Are nails in a jar with water a chemical change

What is the molarity of a solution composed of 4.73 g of potassium iodide (KI) dissolved in enough water to make 0.169 L of solution? Answer in units of M.

Suppose you were given a substance and asked to determine whether or not it was a plasma. Write the characteristics you would look for to identify the substance.

What is a comet? tell in a short and easy answer