Chemistry

The result you obtained during measurement is in mg element per liter of the solution examined. If you've measured original sample, without any previous preparation and/or dilution, the result obtained is the final one (mg/L = ppm). If you've prepared your sample prior to analysis, some additional calculation is needed.

Assume, that you digested 500 mg of the soil in acid, and the final volume of your sample is 25 ml. The solution was measured on ICP-AES and 0.5 mg/L Cu was found. How much Cu the soil contains?

25000 microliter / 500 mg (or 25 ml / 0.5 g) = 50. This is your dilution factor. Multiply your measured result by this factor

0.5 mg/L Cu * 50 = 25 mg Cu per 1 kg of the soil.

Of course, if you diluted your digested sample during the measurement, this dilution factor also must be taken into account.

Yes, CaS is ionic.

If you add the exact mass of the protons, neutrons, and electrons in an atom you do not get the exact atomic mass of the isotope. The diference is called the mass defect. The difference between the mass of the atomic nucleus and the sum of the masses of the particles within the nucleus is known as the mass defect.

Yes.

They're usually made out of ceramics, porcelain, so they can break if dropped for instance.

Both the continuous spectrum and the bright-line spectrum show wavelengths of visible light.

The shorthand electron configuration of aluminum is: [Ne] 3s2 3p1

(4 meters) x (3 per second) = 12 meters per second

Phosphorus is not an oxide. It is an element.

It is a nonmetal.

We use them to perform tasks

Nitrogen

N2O5 is a molecular compound, not ionic.

All numbers which are not "zero" are classed as significant digits. Therefore in the number 129 there will be three digits which are classed as significant.

A wave that represents the direction in the direction the wave moves.

A parent element splits into two daughter elements. (APEX)

Sodium and Pottasium are metals reacts violently, and is stored to avoid contact with moisture in the air.

This is the halogens group: F., Cl, Br, I, At.