If a penny (with the this volume. 39 cm^3) was made out of pure copper, what should its mass be?

Isotopes of an element containa. equal numbers of protons and neutrons. b. the same number of protons but a different number of neutrons. c. the same number of neutrons but a different number of protons. d.

For an endothermic reaction, which of the following conditions must be true for all products? The change in enthalpy is positive and potential energy diagram is higher. The change in enthalpy is negative and potential energy diagram is higher.

Give the nuclear symbol for the isotope of gallium that contains 40 neutrons per atom

Compared to a potassium atom, a potassium ion has A) a smaller radius B) a larger radius C) fewer protons D) more protons

Why are hydrogen ions and hydroxide ions omitted from the net reaction for the hydrolysis of water?

What are the forces that create electromagnetism?

The nose is an organ that acts as an airway for oxygen to enter the body. The nose also contains hairs that trap small foreign objects and stop them from entering the body. Which two systems does the nose play a role in? A. respiratory and immune B.

HBr + Mg (OH) 2 MgBr2 + H2O

What is the ability of a substance to be pulled into a wire? A malleability B ductility C conductivity D solubility

When a counterfeit detection pen is used on an authentic bill, what color does it turn? a. Pale blue b. Pale yellow c. Blue-black d. Pale pink