Matter that is composed of two or more different elements chemically combined in a fixed proportion is classified as

(1) a compound (3) a mixture

(2) an isotope (4) a solution

Compare the dual nature of light.

4. Which of the following elements is stable? A. Fluorine, atomic number 9 B. Carbon, atomic number 6 C. Boron, atomic number 5 D. Neon, atomic number 10

Name the type of chemical reaction that occurs when aluminum (Al) reacts with copper nitrate (Cu (NO3) 2).

An atom with atomic number 26 and 32 neutrons

Convert 1.422g/cm^2 to mg/mm^2

Running a mile involves

How many calories are there in a 255 Food Calorie snack bar? a. 1 x 103 b. 2.55 x 105 c. 1.07 x 103 d. 60.9 e. none of the above

What is the greatest amount of ammonia (NH3) in moles that can be made with 4.7 mol N2 and 6.9 mol H2? Which reactant is limiting? How many moles of excess reactant will be left after the reaction?

Which one of these elements is an alkaline earth metal

Write the chemical equations for the neutralization reactions that occurred when hcl and naoh were added to the buffer solution.