Advertisements
Advertisements
प्रश्न
What happens when cane sugar is strongly heated? Mention any two changes in it.
Advertisements
उत्तर
- Sugar is basically Sucrose.
- The molecular formula of Sugar is C12 H22O11 (or) C12(H2O)11.
- When sugar is heated, it loses all water molecules and decomposes to carbon.
- Chemical change;
- Irreversible change
APPEARS IN
संबंधित प्रश्न
The chemical name of baking soda is ______.
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Complete and balance the following chemical equations:
Ba`"CI"_2` + `"H"_2"SO"_4` `→`
(aq.) (aq.)
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
FILL IN THE BLANK
In a ............ change, new substances are formed.
FILL IN THE BLANK
The new substances formed during a chemical reaction are called the ..................
What do you observe when :
an iron nail is kept in tap water for few days
Write true or false .
A black residue is formed when sugar is heated .
A chemical equation is a statement that describes a chemical change in terms of
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
Give an example of the following chemical changes.
A reaction where colour change is noticed.
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.
The simplest method of preventing rusting of iron is to coat it with oil, grease, or paint. The reason being ______.
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
Chemical changes are important in our day-to-day life. Give examples.
