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Chemicals/Heliums/Quiz

< Chemicals‎ | Heliums

Heliums is an effort, in a lecture format, to describe the chemicals called heliums (the varieties of the element helium).

Spectrum = gas discharge tube: the noble gas: helium He, used with 1.8 kV, 18 mA, 35 kHz. ≈8" length. Credit: Alchemist-hp.

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Quiz edit

  

1 Yes or No, Chemical reactions are associated with some changes in the chemical nature/properties of chemicals.

Yes
No

2 The emission spectrum of atomic hydrogen is divided into a number of spectral series, with wavelengths given by the

formula.

3 Yes or No, C. Friedländer and H. Kayser have independently claimed to have found helium in the [Earth's] atmosphere.

Yes
No

4 True or False, The difference between geochemical reactions and astrochemical reactions is that one is restricted to Earth.

TRUE
FALSE

5 Complete the text:

A short or

realization of a certain

or idea to

its feasibility is called a proof of

.

6 Yes or No, Helium is a colorless and inert gas.

Yes
No

7 True or False, The lightest and most common isotope of hydrogen, having a single proton and no neutrons- 11H is called protium.

TRUE
FALSE

8 Complete the text:

A natural

that deals with the composition and constitution of substances and the changes that they undergo as a consequence of alterations in the constitution of their

is called

.

9 Yes or No, A reaction for which no reaction intermediates have been detected or need to be postulated in order to describe the chemical reaction on a molecular scale is called an elementary reaction.

Yes
No

10 True or False, Helium, U, V, and Se make up the dominant group, giving rise to highly anomalous He and U and weakly anomalous V and Se patterns.

TRUE
FALSE


Hypotheses edit

Main article: Hypotheses
  1. There is at least one chemical unique to Earth.

See also edit

External links edit

{{Chemistry resources}}

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