Who extended the idea that the mass of the atom was concentrated within the nucleus?

How is an endothermic reaction identified in an equation? O A. Heat is included as a reactant in the reaction. O B. The word endothermic is written above the arrow. O c. Heat is included as a product of the reaction. O D.

What is the atomic mass of an element expressed in grams called?

A flask contains 0.220 mol of liquid bromine, br2. determine the number of bromine molecules present in the flask. express your answer numerically in molecules.

Which is an example of Temporal Isolation? A. Flowers that bloom in different months. B. Birds that have different mating calls C. Fruits flies that mate in different locations. D. Squirrels that have different fur colors

What term refers to the elements in a column of the periodic table

Which is an example of an energy transformation? (A) a soccer ball sitting in a field. (B) a person waiting at a crosswalk. (C) an unlit candle. (D) a boulder falling off a tall cliff.

The two major groups of dinosaurs during the Jurassic Period were the saurischians and the A) pterosaurs. B) ichthyosaurs. C) ornithischians. D) herbivores.

There are a few ways to increase the rate of a reaction. When the amount of a substance in a given volume is increased, this is altering the

What can the student predict if she finds the mass of the whole candy bar, including the wrapper?

A hardware salesman measures the mass of a box containing 1000 washers. The mass is 1.1298kg. What is the mass of a single washer in milligrams? Write your answer as a decimal.