Answer:
Hydrogen peroxide should be stored in
1) a cool environment
2) with amber bottles away from sunlight
3) with little drops of sodium phosphate
Explanation:
It has been confirmed that heat and light aids in the decomposition of hydrogen peroxide according to the equation; 2H2O2→2 H2O + O2.
This means that hydrogen peroxide must be stored in a cool place. This will reduce its rate of decomposition. Secondly, it should be stored in amber bottles away from light since light also aids in its decomposition.
Thirdly, drops of sodium phosphate may be added to prevent its catalytic decomposition during storage.
Answer:
a chemical change is usually an irreversible chemical reaction. an example of this is rusting.
a physical change is usually visible while a chemical change isn't. also, a chemical change is irreversible while a physical change is.
Explanation:
Here is your answer:
The crust and uppermost mantle make up the rigid outer layer of Earth, which is called the "lithosphere." The crust and the mantle makes up the lithosphere. The lithosphere is rigid outer part of the earth which contains the upper mantle and the crust.
Hope this helps!
<em>~Nonportrit</em>
Answer:
1. (a) on land and offshore
2. (c) Boiling, evaporation and condensation
3.(d) Haematite and asphalt.
4. (a) octane
5.(d) petroleum gases, liquids and solids.
Explanation:
Cracking refers to the the breakdown of heavier fractions of crude oil to give the lighter fractions of crude oil having greater economic value. For instance, diesel oil may be cracked to yield gasoline which is composed of lighter hydrocarbons and has greater economic value. Cracking is of importance in the petroleum industry because it is used to produce lighter hydrocarbons from heavier ones.
Reforming is the conversion of straight chain hydrocarbons to branched chain hydrocarbons having a lesser tendency towards knocking of engines. It is very important in the petroleum industry because it leads to the production of better quality fuels with higher octane rating.
b) In Nigeria, oil producing communities are usually faced with the problem of damage to arable land due to oil exploration activities. Many oil producing communities in Nigeria are facing severe damage to the ecosystem due to oil drilling in those areas. Also, oil rich communities are at risk of crud oil spillage which contaminates water bodies and leads to loss of employment for the local people and death of aquatic animals.
Answer:
1. RbOH(s) ⇒ Rb⁺(aq) + OH⁻(aq)
2. Na₂CO₃(s) ⇒ 2 Na⁺(aq) + CO₃²⁻(aq)
3. (NH₄)₂SeO₃(s) ⇒2 NH₄⁺(aq) + SeO₃²⁻(aq)
Explanation:
Let's consider the dissolving equations for the following compounds.
1. Rubidium hydroxide
RbOH(s) ⇒ Rb⁺(aq) + OH⁻(aq)
2. Sodium carbonate
Na₂CO₃(s) ⇒ 2 Na⁺(aq) + CO₃²⁻(aq)
3. Ammonium selenite
(NH₄)₂SeO₃(s) ⇒2 NH₄⁺(aq) + SeO₃²⁻(aq)
