1. Before burning in air, the magnesium ribbon is cleaned by
rubbing with a sand paper to
a) Make the ribbon surface shinier
b) Remove the layer of magnesium oxide from the ribbon
surface
c) Remove the layer of magnesium carbonate from the ribbon
surface
d) Remove the moisture from the ribbon surface
2. In a chemical reaction between lead nitrate and potassium
iodide solution the yellow precipitate formed is of
a) Potassium nitrate
b) Potassium iodide
c) Lead nitrate
d) Lead iodie
3. What is a chemical reaction?
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1. B
2. D
3. Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products.
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1. Before burning in air, the magnesium ribbon is cleaned by
rubbing with a sand paper to
a) Make the ribbon surface shinier
b) Remove the layer of magnesium oxide from the ribbon
surface
c) Remove the layer of magnesium carbonate from the ribbon
surface
d) Remove the moisture from the ribbon surface
2. In a chemical reaction between lead nitrate and potassium
iodide solution the yellow precipitate formed is of
a) Potassium nitrate
b) Potassium iodide
c) Lead nitrate
d) Lead iodie
3. What is a chemical reaction?
rubbing with a sand paper to
a) Make the ribbon surface shinier
b) Remove the layer of magnesium oxide from the ribbon
surface
c) Remove the layer of magnesium carbonate from the ribbon
surface
d) Remove the moisture from the ribbon surface
2. In a chemical reaction between lead nitrate and potassium
iodide solution the yellow precipitate formed is of
a) Potassium nitrate
b) Potassium iodide
c) Lead nitrate
d) Lead iodie
3. What is a chemical reaction?
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