SC-29

Chemical formulae

Lower Sec Science · Secondary 1 · Medium · Chemical formulae

A student draws the molecular diagrams for two substances.

• Substance X: each molecule has 1 shaded circle joined to 2 unshaded circles.
• Substance Y: each molecule has 2 shaded circles joined together.

If shaded circles represent oxygen atoms and unshaded circles represent hydrogen atoms, what are the chemical formulae of X and Y?

X: $H_2O$ , Y: $O_2$
X: $HO_2$ , Y: $H_2O$
X: $H_2$ , Y: $O_2H$
X: $O_2H$ , Y: $H_2$

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