Question

when MgO and NaCl CaO react to NaOH
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Hnji, M Sana
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Answer 1

Answer:

Consider the following situations of daily life and think about what happens

when –n milk is left at room temperature during summers.

n an iron tawa/pan/nail is left exposed to a humid atmosphere.

n grapes get fermented.

n food is cooked.

n food gets digested in our bodies.

n we respire.

In all the above situations, the nature and the identity of the initial substance have somewhat changed. We have already learned about physical and chemical changes in the matter in our previous classes. Whenever a chemical change occurs, we can say that a chemical reaction has taken place. You may perhaps be wondering what is meant by a chemical reaction. How do we come to know that a chemical reaction has taken place?

Let us perform some activities to find the answer to these questions.

Figure 1.1

Burning of a magnesium ribbon in air and collection of magnesium

oxide in a watch-glass

Activity 1.1

CAUTION: This Activity needs

the teacher’s assistance. It would be better if students wear suitable eyeglasses.n Clean a magnesium ribbon about 3-4 cm long by rubbing it with sandpaper.n Hold it with a pair of tongs. Burn it using a spirit lamp or burner and collect the ash soformed in a watch-glass as shown in Fig. 1.1. Burn the magnesium ribbon keeping it away as far as possible from your eyes.

What do you observe?

“Facts are not science — as the dictionary is not literature.”

Martin H. Fischer

2021–22

Explanation:

hope it will be helpful to you...

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