What is the second most abundant element in stars?

A.

iron

B.

helium

C.

oxygen

D.

hydrogen

How does a electromagnet work

The reaction for the decomposition of ammonia can be written as shown below. If a student starts with 21.7 g of ammonia how many grams of hydrogen gas will be produced by the reactions? Why 2NH3 = N2 + 3H2 A. 1.28g B. 2.55g C. 3.85g D. 32.5g

Why Saturn has rings around it?

Given the solubility, calculate the solubility product constant (ksp) of each salt at 25°c: (a) pbcro4, s = 4.0 * 10-5 g/l; (b) bac2o4, s = 0.29 g/l; (c) mnco3, s = 4.2 * 10-6 g/l.

A centimeter an millimeter differ from each other by a factor of?

Describe in words the reaction represented by the equation and include a description of the composition of each kind of molecule 2h2+02=2h20

Potassium chloride, kcl, sodium sulfate, na2so4, glucose, c6h12o6, carbon dioxide, co2 and ammonium phosphate, (nh4) 3po4, are soluble in water.

Use the periodic table to select the element from the drop-down menu that has the correct relative electronegativity.

List the symbols for all the elements with electron configurations that end as follows. Each n represents an energy level.

Why is it necessary for the measuring devices to be clean