Which reaction results in only a physical change?

A. 2H2O (l) + electricity ® 2H2 (g) + O2 (g)

B. 2H2O2 (l) ® 2H2O (l) + O2 (g)

C. 2H2 (g) + O2 (g) ® 2H2O (l)

D. H2O (l) + heat ® H2O (g)

What are families of elements with similar chemical properties called?

Which sequence represents the relationship between pressure and volume of an ideal gas as explained by the kinetic-molecular theory? A. more gas particles - more collisions - higher pressure B.

Many hospitals use radioisotopes for diagnosis and treatment or in palliative care. Three radioisotopes used in medicine are given. Write the isotope symbol for each radioisotope. iodine-131: cobalt-60: samarium-153:

Which of the following elements is present in all living things? a. aluminum c. carbon b. lead d. helium

Derscribe the properties and relationship of neutrons, protons, and electrons including charge and relative location in an atom

Originally, the periodic table was arranged by increasing atomic radius increasing atomic mass increasing atomic number increasing number of electrons

How many moles are in 15.5-g SiO2

Is Oxygen - O2 a pure substance or a mixture?

What atom has 14 protons and 14 electrons

What is a diagram showing the forces acting on a coasting bike rider traveling at 25 km/h on a flat roadway