The document discusses why apples turn brown when exposed to air. It notes that apples contain iron, and when iron reacts with oxygen in the air through oxidation, it causes the apple's color to change. The document then describes an experiment where apples were submerged in different liquids like lemon juice, vinegar, milk of magnesia and soda to see if the liquids could prevent color change. The results showed that only apples in lemon juice did not brown, disproving the hypothesis that acids in general could protect against color change.
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Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
3. Search and search
Apple contain high amount of iron.
Oxidation :when iron reacts with oxygen
in air it turns its colour .
Also apple contain fibers but it has
nothing to do with the change in colour .
Apples of different colours do the same
change in colour.
4. When the apple is exposed to air its color
changes as oxygen in air reacts with the
iron it has and this is called oxidation.
7. Prediction
Acids can protect the apples from
changing its colour.
Examples for acids :lemon and vinegar.
Examples for bases : milk of magnesia
and soda.
9. Results
The apples in lemon only are the ones
who did not change in color ,even the
ones in vinegar changes it’s color.
So ,it has nothing to do with acid and may
be there is another thing in lemon which
protects the apple
10. Right or wrong?
My prediction in wrong .
So I have to repeat it until I reach the
right result.
11. Observation & I asked a
question to identify the
problem to solve
13. Hypothesis
Acids can protect the apples from
changing its color.
Examples for acids :lemon and vinegar.
Examples for bases : milk of magnesia
and soda.
(Which is a prediction which can be
tested).
