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timofeeve [1]
3 years ago
10

MULTIPLE CHOICE QUESTION

Chemistry
1 answer:
Tanzania [10]3 years ago
3 0

Answer:

the oxidation number of those elements is 2 because some of them are molecules

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Draw the electron dot structure for the hydrogen carbonate ion hco3-. Carbon is the central atom, and hydrogen is attached to ox
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If you had excess aluminum, how many moles of aluminum chloride could be produced from 28.0 g of chlorine gas, Cl2?
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Yes chemistry. Try to add then multiply the top. Get the moles and you will find it.

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Try to add then multiply the moles in the equation

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Which of the following statements is true? Sound waves create areas of high and low pressure, Areas of high pressure are called
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4 years ago
_Cuo +H, → _Cu + _H,0
Elena-2011 [213]
<h3>Answer:</h3>

CuO(s) + H₂(g) →  Cu(s) + H₂O(l)

<h3>Explanation:</h3>
  • Assuming the reaction is the reduction of CuO by H₂
  • Then the balanced equation for the reaction is;

CuO(s) + H₂(g) →  Cu(s) + H₂O(l)

  • The equation shows the reducing property of hydrogen gas, such that hydrogen reduces metal oxides such as copper(ii)oxide to the respective metals.
  • The law of conservation requires chemical equations to be balanced so as the mass of reactants will be equal to that of products.
  • In this case; there is 1 copper atom, 1 oxygen atom and 2 hydrogen atoms on both side of the equation and thus the equation is balanced.

3 0
3 years ago
A cake rises as it bakes because a chemical change causes ________to be produced
Sidana [21]
The correct  answer to this question is carbon dioxide. A cake rises as it bakes because a chemical change causes carbon dioxide to be produced. Thank you for posting your question. I hope that this answer helped you. Let me know if you need more help. 
5 0
3 years ago
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