Hydrogen can be prepared by reacting cold water with?

Question

The safest way to make hydrogen in the laboratory is to add hydrochloric acid to 
  calcium  
  iron  
  potassium  
  sodium  
6.) Hydrogen may be formed when steam reacts with hot 
  copper  
  iron  
  mercury  
  silver  
7.) The lightest element known is 
  boron  
  helium  
  hydrogen  
  lithium  
8.) Hydrogen is 
  less dense than air and inert  
  very soluble in water and combustible  
  odorless and a reducing agent  
  denser than air and tasteless  
9.) Hydrogen may be obtained by the reaction of hydrochloric acid with 
  copper  
  mercury  
  silver  
  zinc  
10.) When copper oxide is heated with hydrogen, which substance is oxidized? 
  copper  
  copper oxide  
  hydrogen  
  water  
11.) Uncombined hydrogen is found in 
  soda water  
  acids  
  hydrogen peroxide  
  water gas  
12.) When hydrogen and oxygen are mixed 
  they explode  
  they combine forming water slowly.  
  they form hydrogen peroxide.  
  they form an explosive mixture.  
13.) Hydrogen was discovered by 
  Preistly  
  Scheele  
  Lavoisier  
  Cavendish  
14.) In the preparation of hydrogen in the laboratory the acid used is added through the 
  delivery tube  
  thistle tube  
  trough  
  collecting bottle  
15.) Hydrogen is used: 
  to support burning  
  as part of fuel gas  
  as an explosive  
  as a cooling agent  
16.) If lead oxide is heated in a stream of hydrogen, the products will be 
  lead hydride and oxygen  
  lead and water  
  lead oxide and hydrogen  
  lead oxide and water  
17.) A cold piece of iron was held over a Bunsen flame. Droplets of water collecting on the cool surface indicated that the fuel contained 
  carbon  
  carbon dioxide  
  carbon monoxide  
  hydrogen  
18.) Helium rather than hydrogen is used in dirigibles because 
  it is lighter than hydrogen  
  it is insoluble  
  it is cheaper  
  it does not burn  
19.) If an explosion results from placing a burning splint into a bottle of gas, the gas may have been 
  oxygen  
  carbon dioxide  
  hydrogen  
  nitrogen  
20.) The removal of oxygen from a compound is called 
  oxidation  
  hydrogenation  
  reduction  
  filtration  
21.) Holding a bottle of hydrogen inverted and without a cover plate indicates that hydrogen 
  is a gas  
  is heaver than air  
  is lighter than air  
  is soluble in water  
22.) In the process of reduction, whenever one substance is reduced, another is 
  hydrogenated  
  oxidized  
  aerated  
  condensed

pisgahchemist · Accepted Answer

Oh my goodness.  Too many questions.  We're happy to help you understand some sticky point of chemistry, but not to do your homework, and this looks like a boatload of homework.

For instance, if you knew nothing of descriptive chemistry, then we would point out that the alkali metals react easily with water, cold or otherwise.  Some alkaline earth metals react slowly with water, the warmer the better, and Mg will react only with steam.

Tanvi · Answer

The very active metals like sodium, potassium & calcium liberate hoydrogen gas from cold water, the other product being a mettalic hydroxide. Sodium and pottasim react violently with water while calcium reacts comparatively slowly...
Hope it works.. :-)

? · Answer

no that's via actuality that throughout the two acids and bases hydronium ions are modern. the version lies basically of their concentration. so even base carry approximately heating yet to small quantity.............

Trending News

Hydrogen can be prepared by reacting cold water with?

3 Answers