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  Cervical cancer is one of the leading causes of cancer-related deaths among women worldwide. However, it is also one of the most preventable and treatable cancers when detected early. This blog provides an in-depth look at what cervical cancer is, why it occurs, how it spreads, and how it can be prevented. What is Cervical Cancer? Cervical cancer begins in the cells of the cervix—the lower part of the uterus that connects to the vagina. When healthy cells in the cervix undergo changes (mutations) in their DNA, they begin to grow uncontrollably and form tumors. There are two main types of cervical cancer: Squamous Cell Carcinoma: The most common type, originating in the thin, flat cells lining the outer part of the cervix. Adenocarcinoma: Develops in the glandular cells of the cervix that produce mucus. Why Does Cervical Cancer Occur? The primary cause of cervical cancer is persistent infection with human papillomavirus (HPV) . However, several other factors contribut...
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To perform and observe the action of heat on crystals of ferrous sulphate and classify the reaction.

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 AIM: To perform and observe the action of heat on ferrous sulfate crystals and classify the reaction.

Materials Needed

Ferrous sulfate crystals (FeSO₄·7H₂O), Bunsen burner, Test tube, Test tube holder, Safety goggles, Heat-resistant mat or stand.

THEORY

Ferrous sulfate (FeSO₄·7H₂O) is a blue-green crystalline compound. When heated, it undergoes dehydration and decomposition.

The action of Heat on Ferrous Sulfate

  1. Dehydration:

    • Reaction: FeSO4.7H2O(s)   →(heat)   FeSO4(s) + 7H2O
    • Observation: The green crystals lose water and turn white.
    • Type of Change: Physical change (loss of water).

  2. Decomposition:

    • Reaction:
    • Observation: The white powder turns brown, releasing sulfur dioxide (SO₂) and sulfur trioxide (SO₃) gases.
    • Type of Change: Chemical change (formation of new substances).
PROCEDURE
Step 1: About 5 g ferrous sulphate crystals in a dry boiling tube is taken.
Step 2: The colour of the ferrous sulphate crystals is noted.
Step 3: The boiling tube is heated.
Step 4: The colour of the crystals after heating is observed.
Step 5: A gas is evolved which is smelled.
Step 6: A wet blue litmus paper is brought near the mouth of the boiling tube.

Observations

  • Color Change: The green crystals turn white as they lose water, and then turn brownish upon further heating.
  • Decomposition: A gas with a characteristic pungent odor (SO₂) is released during the decomposition.
Inference
1.When heated, ferrous sulphate crystals are decomposed to produce Ferric oxide, sulphur dioxide and sulphur trioxide.
2. Such reactions are called decomposition reaction.

Precautions

  • Always wear safety goggles while performing the experiment.
  • Use a test tube holder to hold the test tube to avoid burns.
  • Conduct the experiment in a well-ventilated area or under a fume hood to avoid inhaling gases produced during decomposition.

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