atom, Chemistry

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two reasons why is it necessary to ionise chromium atomsin a sample

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Atomic mass when number of neutrons and electrons alter, Atoms consists of ...

Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two  times  respectively to their actual masses, then the atomic mass of

Periodic Table, What are the s block elements on the Periodic Table

What are the s block elements on the Periodic Table

Lab questions, 1. List possible manipulation errors that might contribute t...

1. List possible manipulation errors that might contribute to the following errors in results: 1) obtaining a significantly larger amount of NaCl than was present in the original

Which kind of volcano is the most destructive, Which kind of volcano is the...

Which kind of volcano is the most destructive? Well each type of volcano can be very destructive and if you are talking in human loss of life terms than the answer is any type

Why does the solution become purple after drops of iodine, 1(a). In these r...

1(a). In these reactions, I2 (in the iodine solution) has what oxidation number? 1(b). The iodine starch reaction that turns purple depends on iodine being in the I- state. Was

Containing 2 alcohol functional groups, Consider the diols (containing 2 al...

Consider the diols (containing 2 alcohol functional groups) of molecular formula C 5 H 12 O 2 (a) Illustrate all the possible structural isomers.  (b) Label the stereogenic

Factor label method, If the density of a substance is 7.99 g/mL. What is th...

If the density of a substance is 7.99 g/mL. What is the mass of 3.60 mL of this substance?

Entropy change for the reaction., The standard free energy change for a rea...

The standard free energy change for a reaction is -212.3 kJ mol -1 . If the enthalpy of the reaction is - 216.7 kJ mol -1 , calculate the entropy change for the reaction.

Use of halides of boron, Q. Use of Halides of Boron? Boron trihalides o...

Q. Use of Halides of Boron? Boron trihalides of the type BX3 exist for all the four halogens. Boron trifluoride can be prepared on a large scale by the fluorination of boric ox

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