What percent of earths surface is made up of oxygen

Which of these elements has the most chemically reactive atoms? a. gold b. argon c. carbon d. chlorine

Identify the number and type of atoms in the following molecules. Nitrogen, Oxygen, Ozone, Phosphorus, Sulfur.

Consider the synthesis of ammonia 3 H2 + N2 à 2 NH3 If a student were to react 38.5 g of nitrogen gas, how many moles of ammonia would be produced?

Which of the following is not an example of a mineral crystal shape? A. Calcite B. Kryptonite C. Quartz D. Pyrite

What is the pH of a solution with [H+] = 7.0 x 10^-2?

The number of protons in the nucleus Of an Atom is equivalent to which of the following

What does pH measure? number of hydrogen atoms in an acid number of hydroxide atoms in a base concentration of hydrogen ions in solution concentration of hydroxide ions in solution

Based on charles's law, which of the following statements is true for an ideal has at a constant pressure and mole amount? A. The number of collisions is independent of volume B. The number of collisions decreases with increase in volume C.

50. mL of water is initially 70. k and cooled to 25. k. What is the thermal energy?

Which of the following statements is true about both nuclear fusion and nuclear fission? They occur in the sun. Heavy atoms are split. Two light nuclei combine. Some mass changes into energy.