A piece of platinum metal with a density of 21.5 g/cm3 has a volume of 8.89 cm3. what is its mass?

Why are the transition medals section ten columns wide

A chemist prepares 1.0 L of a buffer solution by preparing an aqueous solution containing 1.00 mol of H2PO4-, then adding 0.27 moles of KOH to convert the acid into its conjugate base. What is the final pH of the solution? The Ka for H2PO4 - is 6.

What is the coating, marked by arrows in the diagram shown, at the ends of the leg bones? White blood cells Rock Marrow Cartilage

If the heat involved in a chemical reaction has a negative sign, A. heat is lost to the surroundings. B. heat is gained from the surroundings. C. no heat is exchanged in the process.

Responding to stimuli that are similar-but not identical-to a conditioned stimulus is called a. spontaneous recovery b. respondent reinforcement c. stimulus discrimination d. stimulus generalization

What happens to the velocity of a sound wave in air if the temperature of the air increases

Determine the [oh-] concentration of a 0.741 m koh solution at 25°c.

In the lab, students decomposed a sample of calcium carbonate by heating it over a Bunsen burner and collected carbon dioxide according to the following equation: CaCO3 (s) CaO (s) CO2 (g) (a) How many mL of carbon dioxide gas were generated by the

J. J. Thomson A) Electrons are in orbital levels. John Dalton B) Atoms are the smallest unit of an element. Ernest Rutherford C) Electrons are scattered within the atom. Niels Bohr D) Protons are at the center of an atom.

Which answer best describes an alloy