Select two options from the following list that qualify as types of pure substances. a substance an atom an element a particle matter a compound

Energy is used to combine amino acid building blocks in order to build a large protein. What type of reaction is this?

Which force created a fault-block mountain? compression shearing subduction tension

How many moles are produced when 20.0 moles of ammonia react?

What are three sources of information scientist use when they do research

What is the number that you never write as a subscript?

What is the valence of Fluorine

When liquid helium is exposed to room temperature, it forms a gas. Which best explains why this happens? The liquid helium absorbs energy from the air in the room. The particles in the air absorb the energy of the liquid helium.

Why was Bohr's model considered more accurate than Dalton's model?

Select the statements that correctly describe a buffer. 1) The pH of a buffer solution does not change significantly when any amount of a strong acid is added. 2) A buffer is generally made up of a weak acid and its conjugate base.

What chemical molecules are required for cellular respiration?