How many moles are equal to 3.82x10^20 atoms of helium?

Is granite rock a compound, element, mixture? Explain

A compound is analyzed and found to contain 36.70% potassium, 33.27% chlorine, and 30.03% oxygen. What is the empirical formula of the compound?

Isotopes are atoms of an element a. with the same number of electrons but different numbers of protons. b. that are radioactive. c. with a magnetic charge. d. with the same number of protons but different number of

Enter the molecular equation representing aqueous nitric acid and aqueous ammonia reacting. express your answer as a balanced molecular equation. identify all of the phases in your answer.

When a cold drink is taken from a refrigerator, its temperature is 5°C. After 25 minutes in a 20°C room its temperature has increased to 10°C. (Round your answers to two decimal places.) (a) What is the temperature of the drink after 40 minutes? 12.

What is the definition of colorie

How does a solid differ from a liquid? b. how does a liquid differ from a gas? c. how is a liquid similar to a gas? d. what is a plasma?

Which pair of elements will form an ionic bond? N and O K and Br C and Cl Fe and Ni

What does mass is conserved in a chemical reaction mean

Which atom has a nucleus that contains 13 protons and 14 neutrons 1. Mg 2. Be 3. Al 4. N