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devlian [24]
3 years ago
7

HELP PLEASE !!!! DUE NOW!!

Chemistry
1 answer:
ratelena [41]3 years ago
6 0

Answer:

The ratio of the products to reactants remains caonstant over time

Explanation:

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The volume of an irregular solid can be found from its displacement in a known volume of water.
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The volume of an irregularly shaped solid can be determined from the volume of water it displaces. A graduated cylinder contains 19.9 mL of water. When a small piece of galena is added, it sinks and the volume increases to 24.5 mL

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Lab activity - Law of Conservation of Mass with vinegar and baking soda.
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What is true of all mass and volume of all floating objects
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If the density is higher than water than the object will sink
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In each of the three reactions between NaOH and HCl, the sign of q for the water was positive. This means the the sign of q for
Talja [164]

Answer:

This means the the sign of q for the reaction was _NEGATIVE _____ and the reaction was _EXOTHERMIC_____.

Explanation:

In calorimetry, when heat is absorbed by the solution, the q-value of the solution will have a positive value. This means that the reaction will produce heat for the solution to absorb and thus the q-value for the reaction will be negative. This is an exothermic reaction.

Whereas, when heat is absorbed from the solution, the q-value for the solution will have a negative value. This means that the reaction will absorb heat from the solution and so the reaction is endothermic, and q value for the reaction is positive.

So, from the question, since the q-value of water is positive, it means that heat is absorbed by the solution and the reaction will produce a negative value of q and it's an exothermic reaction because the reaction produces heat for the solution.

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A chemical equation is shown:
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 The number  of  oxygen atoms  are 6  atoms


  <u><em>Explanation</em></u>

According to the law of mass conservation the number of  reactant atoms   is equal to  number  of product atoms.

For  given equation  to  obey  the  law of mass  conservation  it need to be balanced as below

4 Al + 3 O₂ → 2 Al₂O₃

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= coefficient  in front  of   Al₂O₃   ×  subscript  of O

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3 years ago
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