_______ happens when two substances break a part
into their finest parts and thoroughly mix together
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One part of an element (A) combines with two parts of another element (B). Six parts of element (C) combines with 4 parts of (B). If (A) and (C) combine together, then the ratio of their weights will be governed by:
Q2
If a cone is cut into two parts by a horizontal plane passing through the mid-point of its axis, then the ratio of the volumes of the upper part and the cone is
Q3
When hydrogen is passed over a black solid compound A, the products are 'a colourless liquid' and 'a reddish brown metal B'.
Substance B is divided into two parts, each placed in separate test tubes.
Dilute HCl is added to one part of substance B and dilute HNO
3
to the other. What happens to substance A when it reacts with hydrogen ? Give reasons for your answer.
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Answer:
physical change happen when two substances break a part
into their finest parts and thoroughly mix together
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