Which one is not required for reaction of nitrogen with hydrogen to form ammonia gas?

1. uv light 2. high pressure

3. high temperature 4. iron catalyst

Given the energy levels of electrons in a hydrogen atom (table), rank the photons emitted by the following electron transitions from longest to shortest wavelength. n=4 to n=3 n=4 to n=2 n=2 to n=1 n=3 to n=1

Why pH level test is important in lotion testing? Why it matter? Explain your answer

An elements atomic number is 117 how many electrons would an atom of this element have?

During which stage of a thunderstorm does rain begin to fall? a. The development stage c. The mature stage b. The precipitation stage d. The waxing stage

Water that freezes into ice, thaws back into water, and then freezes again in the cracks of rocks causes which type of weathering A. mechanical weathering B. neither chemical nor mechanical weathering C. hydraulic weathering D. chemical weathering

What is the change in heat energy when 132g of copper at 32.2°C is raised to 45.0oC? The specific heat of copper is 0.385 J/g °C.

Polar covalent bonds are formed when the electrons in the bond are not shared equally between the two nuclei. which one of these molecules contains polar bonds?

The flame from my candle gives off black smoke heat and light what type of changes do these indicate

Which one of the following processes results in a decrease in the number of neutrons? corrosion electron capture gamma emission positron emission alpha emission

Calculate the root mean square velocity of F2, Cl2, and Br2 at 304 K.