What is a chemical change?

A.) Splitting water into hydrogen and oxygen

B.) Breaking a block of solid ice into smaller pieces

C.) Freezing liquid water

D.) Boiling water

Neutrons have. a. negative b. positive c. no charge d. nucleus

What is the mass number of an ion with 105 electrons, 157 neutrons, and a 1 charge?

Which of these extracellular signal molecules could diffuse through a plasma membrane and bind to an intracellular receptor?

An unknown solution has a pH of 8

State the formula for density in words and mathematical symbols.

Why does a neutral solution have a of 7.0? In a neutral solution, the [H3O+]=1*10^-7 at 25∘C. pH=-log[1*10^-7]=7.0. In a neutral solution, the [H3O+]=1*10^7 at 25∘C. pH=log[1*10^7]=7.0. In a neutral solution, the [H3O+]=1*10^14 at 25∘C. pH=0.

Which type of bond would most likely be found in HBr

Which halogen is most likely to react? a. Br (bromine) b. F (fluorine) c. I (iodine) d. Cl (chlorine)

In the formula for water (H2O) what does the subscript 2 indicate?

Balance the nuclear reaction equation for the beta minus decay of nickel-63 by completing the missing numbers. The superscript of nickel is . The subscript of copper is .