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How do you write the formula of zinc oxide?

The formula for zinc oxide is ZnO Group 16 oxygen commonly forms an O2− anion while zinc forms Zn2+ cation.... View Article

How do you calculate the number of valence electrons in an atom?

The valence electrons (VE) are the electrons in the outer shell of an atom. These are involved in forming bonds... View Article

How Do You Calculate The Molar Mass Of Heavy Water

The chemical formula of heavy water is D2O. Heavy water looks like water, but is about 10 percent heavier. In... View Article

How do you calculate the frequency of red light?

v=f×λ (where the funny symbol, λ means wavelength in metres) So f=v/λ fmax = 3 × 108/620 × 10 −... View Article

How do you calculate the formal charge of all atoms in NO₃^–?

Formal charge on N = 5−4 = +1 The formal charge on O1 = 6−7 = −1 The formal charge... View Article

How do you calculate the energy of an electron in the ground state of a hydrogen atom?

A simple expression for the energy of an electron in the hydrogen atom is: E=−13.6/n2 where the energy is in... View Article

How do you calculate moles of solute?

Number of moles of solute = massofsolute/molarmass of solute mass is measured in grams and molar mass is measured in... View Article

How do you balance NH3 + O2–> NO2 + H2O?

4NH3+7O2→4NO2+6H2O 4 nitrogen atoms and 12 hydrogen atoms are taking part in this reaction. 6 molecules of H2O. There are... View Article

How can I learn the valencies of the first 20 elements?

VALENCY OF FIRST 20 ELEMENTS WITH THEIR SYMBOL Hydrogen [H] -valency- 1 Helium [He]-valency-0 Lithium [Li]-valency-1 Beryllium [Be]-valency-2 Boron [B]-valency-3... View Article

How are metalloids different from metals?

Metalloids are a group of elements found in the centre section of the periodic table, in between metals and non-metals.... View Article

DNA is made up of genes or genes are made up of DNA?

Genes are made up of DNA. Genes are functional units of heredity as they are made of DNA. It is a... View Article

Are hormones always proteins?

Hormones generally fall into 3 categories: lipid-based, amino acid-based, and peptide-based. Lipid-based hormones are mostly derived from cholesterol, so they... View Article

A positive Seliwanoff’s test is obtained with? A] Glucose B] Fructose C] Galactose D] Mannose

A positive Seliwanoff’s test is obtained with Fructose. Seliwanoff’s test is a compound test which separates aldose and ketose sugars.... View Article

A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emission is at 680 nm, the other is at – i) 1035 nm ii) 325 nm iii) 743 nm iv) 518 nm?

Absorbed energy = Emitted energy hc/λ = hc/λ1 + hc /λ2 = 1/ λ 1 + 1 /λ2 1/355 =... View Article

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