how do u solve

5 1/4 * 4 * 2/3

Which is of these nonmetals are more reactive - bromine or krypton? Explain.

What are the four characteristics of minerals

How do you do nuclear bombardment reaction equations?

a sample of an unkown metal has a mass of 120.7g. As the sample cools from 90.5C to 25.7C, it releases 7020J of energy. What is the specific heat of the sample

Which metal will displace nickel in a compound? A. Tin B. Arsenic C. Zinc D. Platinum

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2 (l) → 2H2O (l) + O2 (g) ΔH = - 196 kJ Calculate the value of q (kJ) in this exothermic reaction when 3.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?

Which statement best explains why elements are matter? An element is a physical substance that has mass and takes up space. Elements are pure substances that cannot be divided chemically. Each element is a pure substance composed of one type of atom.

Which of the following best describes what causes the phases of the moon? The alignment of the sun, Earth, and moon The speed of the moon around the Earth The speed of the Earth around the sun The alignment of the planets

At which temperature would atoms of a He (g) sample have the greatest average kinetic energy? (1) 25°C (3) 273 K (2) 37°C (4) 298 K