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kumpel [21]
3 years ago
6

PLS HELP THIS IS TIMED

Chemistry
2 answers:
olga_2 [115]3 years ago
7 0

Answer:

The plant population has decreased. This culd reduce the other organisms as they may rely on the plants

Explanation:

hammer [34]3 years ago
4 0

Answer:

the plant population over time has decreased. this could make all other organisms above the plant population numbers decrease as well.

Explanation:

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for the following reaction: 1 CuO + 1 H2 --> 1 Cu +1H2O, what is the quantity of moles of H2O when there are 240 grams of CuO
Ber [7]

Considering the reaction stoichiometry, the quantity of moles of H₂O produced is 3.02 moles.

The balanced reaction is:

CuO + H₂ → Cu + H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:  

  • CuO= 1 mole
  • H₂= 1 mole
  • Cu= 1 mole
  • H₂O= 1 mole

The molar mass of the compounds present in the reaction is:

  • CuO= 79.55 g/mole
  • H₂= 2 g/mole
  • Cu= 63.55 g/mole
  • H₂O: 18 g/mole

Then, by reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of mass of each compound participate in the reaction:  

  • CuO= 1 mole× 79.55 g/mole= 79.55 grams
  • H₂= 1 mole× 2 g/mole= 2 grams
  • Cu= 1 mole× 63.55 g/mole= 63.55 grams
  • H₂O: 1 mole× 18 g/mole= 18 grams

Then, it is possible to determine the moles of H₂O necessary by the following rule of three:  If by reaction stoichiometry 79.55 grams of CuO produces 1 mole of H₂O, 240 grams of CuO produces how many moles of H₂O?

molesofH_{2} O=\frac{240 grams of CuOx 1 mole ofH_{2} O }{79.55 grams of CuO}

<u><em>moles of H₂O= 3.02 moles</em></u>

Finally, the quantity of moles of H₂O produced is 3.02 moles.

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6 0
3 years ago
Why cant flame color determine the identity of an ion
AysviL [449]
The flame test is used to visually determine the identity of an unknown metal or metalloid ion based on the characteristic color the salt turns the flame of the bunsen burner 
6 0
3 years ago
If Chris throws the baseball 60 meters in 4 seconds, what is the average speed of the football?
stealth61 [152]
60/4=15
so 15meters per second
4 0
3 years ago
Read 2 more answers
The outermost electrons are the_____electrons
Lynna [10]

Answer:

Valence electrons. they can be used to determine the group of an element.

Explanation:

6 0
3 years ago
Write dissociation equations for the following soluble salts dissolving in water. Then draw a particle - level representation fo
zhuklara [117]

Answer:

The dissociation equations for NaBr gives Na+ and Br-

The dissociation equations for ZnCl2 gives Zn2+ and 2 Cl-  

Explanation:

The following pictures shows that the dissociation of one particle of NaBr produces one particle of Na+ (sodium cation) and one particle of Br- (bromine anion).

The dissociation of one particle of ZnCl2 produces one particle of Zn+2 (Zinc cation) and two particles of Cl- (chlorine anion).

8 0
4 years ago
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