Answer:
The Earth rotates on its axis at a constant tilt.
Earths rotation on its axis at a constant tilt provides seasonal changes in the different part of the country. This resulted to the distribution of the heat of the sun from northern hemisphere and to southern hemisphere. Making areas with hot temperature may experience rainy season in a year. This will help production of crops or food supply and water supply available for living organism.
If the Earth's rotation is not tilted, then both the northern hemisphere and southern hemisphere will be covered with thick ice sheet. The equatorial region or near the equatorial region will experience tremendous warm temperature. Making our life on Earth not ideal for living.
Magnetic Field
Earth is protected by the magnetic from the dangerous radiation coming from the heat of the sun.
Water and oxygen
These two elements are essential for living organism in order to survive. The existence of waters proves that Earth temperature is conducive for living.
The products and reactants weigh the same since u have to balance out the equation to have an equal number of molecules on bothsides
Answer:
Explanation:
This question is incomplete. However, let's understand what a single displacement reaction is and what occurs during such reactions.
A single displacement reaction is a reaction in which a more reactive element displaces/replaces a less reactive element in a compound. The reactions below depict a single displacement reaction.
A + BC ⇒ AC + B
2Al + Fe₂O₃ ⇒ Al₂O₃ + 2Fe
During chemical reactions, heat is either absorbed from the environment (endothermic reaction) or given off into the environment (exothermic reaction). <u>During bond formation (in a reaction), heat is released into the environment (exothermic) while when bonds are broken, heat is absorbed from the environment (endothermic).</u>
During single displacement reaction, heat is given off, hence single displacement reaction is an exothermic reaction because it involves the formation of a bond (for the compound formed in the product).
Please note that <u>it can be argued that bonds were also broken in the reactants before new ones are formed in the products, however the bonds broken in the reactant do not require much heat from the environment because the more reactive element ordinarily has a higher activity than the displaced element thus, the entire reaction produces heat (exothermic) when the new bond is being formed</u>.
What is usually observed during a single displacement reaction is the release of heat and this shows the reaction is an exothermic reaction.
I hope this will help The Periodic Tables
