What is rust? Give its chemical name and formula
What is crystallisation?
What happens when baking soda is treated with vine
Why does rusting takes place faster during rainy seas
What happens when magnesium oxide is dissolved i
nswer questions.
te one activity to demonstrate a physical change
at is the difference between anhysical chanan
Answers
Explanation:
1.Rust is a general term for a series of iron oxides, usually, red oxides, formed by the reaction of iron with oxygen in the presence of water or air moisture.
The chemical formula for rust is Fe2O3 , which is called iron oxide but is also known as ferric oxide.
2.Crystallization is a technique used for the purification of substances. A separation technique to separate solids from a solution.
3.Baking soda and vinegar react with each other because of an acid-base reaction. Baking soda is a bicarbonate (NaHCO3) and vinegar is an acetic acid (HCH3COO). One of the products this reaction creates is carbon dioxide.
4.Rusting of iron is much faster in rainy season as compared to other seasons. ... On rainy days, moisture is more and iron comes in contact with atmospheric oxygen and water and thus forms iron oxide which is also known as rust.
5.when magnesium oxide dissolved in water then it shows a reaction in which magnesium hydroxide Mg(OH) and hydrogen gas (H2) forms. These reactions found alkaline in nature.
6.Physical Change Chemical Change
When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged. When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.
Physical change is a temporary change. A chemical change is a permanent change.
A Physical change affects only physical properties i.e. shape, size, etc. Chemical change both physical and chemical properties of the substance including its composition
A physical change involves very little to no absorption of energy. During a chemical reaction, absorption and evolution of energy take place.
Some examples of physical change are freezing of water, melting of wax, boiling of water, etc. A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
Generally, physical changes do not involve the production of energy. Chemical changes usually involve the production of energy (which can be in the form of heat, light, sound, etc.)
In a physical change, no new substance is formed. A chemical change is always accompanied by one or more new substance(s).
Physical change is easily reversible i.e original substance can be recovered. Chemical changes are irreversible i.e. original substance cannot be recovered