How many grams of bromine (Br2) are there in 2.51*1024 atoms

What is high porosity

What is a property that describes how easily a substance undergoes chemical changes?

What type of compound does the formula, HCl, represent? A. Ionic salt b. Covalent molecule

A molecule contains five atoms and has a molecular weight of 85 g per mole. the atoms are of elements with atomic numbers 1, 6, and 17. which molecular structure could represent this molecule?

How does your nervous system respond to a stimulus such as a loud noise, a hot object, or a sudden change in temperature?

56 Explain, in terms of atomic structure, why the elements in Group 2 have similar chemical properties. 131

What must molecules do to react? a. Molecules must heat up b. Molecules must collide c. Molecules must expand to fill their container d. Molecules must interact with a catalyst

How many pictograms are in a gram?

Which type of signaling pathway uses second messengers because the hormone cannot pass through the plasma membrane? a.) amino acid based b.) lipid based

Why are the gases in the troposphere layer denser than the gases in the other layers?