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T1 CH3 Matter Around Us — Science STD 7 — Question

Tamilnadu BoardEnglish MediumSTD 7ScienceT1 CH3 Matter Around Us3 Marks
Question
Write the chemical formula and name the elements present in the following compounds.
  1. Sodium chloride
  2. Potassium hydroxide
  3. Carbon dioxide
  4. Calcium oxide
  5. Sulphur dioxide
✓

Answer

    Chemical fromula Elements present
a. Sodium chloride NaCl Sodium (Na), Chlorine (Cl)
b. Potassium hydroxide KOH Potassium (K), Oxygen (O), Hydrogen (H)
c. Carbon-di-oxide $CO _2$ Carbon (C), Oxygen ($O _2$)
d. Calcium oxide CaO Calcium (C), Oxygen ($O _2$)
e. Sulphur dioxide $SO _2$ Sulphur (S), Oxygen ($O _2$)

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