What is the mass number of boron

Which component did the development of the cell theory involve?

Which statement best describes balancing equations and the law of conservation of mass? O There are more atoms in the reactants than in the products, and the total mass is the same in the reactants and in the products The number of atoms is the same

A newly isolated natural product was found to have the molecular formula C15H28O2. By hydrogenating a sample of the compound, it was determined to possess one π bond. How many rings are present in the compound?

In which form is most of the water on Earth? A. solid B. gas and solid C. liquid D. gas

Which processes occur during the second stage of technological design? Check all that apply.

What do astronomers use to calculate the age of the universe? Check all that apply. dark energy the age of rocks on Earth the age of the oldest stars patterns of background radiation how fast distant galaxies are moving away from us

Determine the distance of closest approach (in fm) before the alpha particle reverses direction. Assume the lead nucleus remains stationary. Assume the alpha particles are initially very far from a stationary lead nucleus.

Why does the bottom of the boat appear to be longer than the top of the boat

Which best explains why greg's hands get warm as he holds a bowl of hot soup? heat energy is created from the thermal energy in greg's hands. heat energy is absorbed by the soup from greg's hands. thermal energy from the soup moves to greg's hands.

What are the units of k in the following rate law? Rate = k[X][Y]M/s1/Mss/M^2M/sM^2/s