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Marat540 [252]
3 years ago
13

HELLPPPPPPPPPPPPP :((((((((

Chemistry
2 answers:
sleet_krkn [62]3 years ago
7 0

Answer:

correct representation of reaction is option C

Explanation:

SVEN [57.7K]3 years ago
4 0

Answer:

no

Explanation:

no

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A chemical change involves a change in ________. A chemical change involves a change in ________. phase the elements of a molecu
Firlakuza [10]

Answer:

All of the above.

Explanation:

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.

This process is not reversible and a change of energy that is sometimes heat is given off.

4 0
3 years ago
An astronomer is a guest speaker at your school. She states that iron is the very last product in stellar fusion. Why would she
Zarrin [17]

Iron is the very last product in stellar fusion is that; Iron has a tightly bound nucleus, and atoms larger than iron are less stable and tend to undergo nuclear fission.

The stability of an atom is dependent on the binding energy per nucleon of the atom.

The binding energy per nucleon of elements increases steadily until iron, we can see that from the curve very easily.

Beyond iron, we have exceeded the region of stable binding energy per nucleon of atoms. The atoms after iron in the curve are mostly unstable heavy nuclei.

Learn more: brainly.com/question/10095561

6 0
2 years ago
If aqueous solution of lead (ll) nitrate and sodium sulfate, which insoluble precipitate is formed
forsale [732]

Answer:

Lead(II) sulfate

Explanation:

This looks like a double displacement reaction, in which the cations change partners with the anions.

The possible products are

Pb(NO₃)₂ (aq)+ Na₂SO₄(aq) ⟶PbSO₄(?) + 2NaNO₃(?)

To predict the product, we must use the solubility rules. Two important ones for this question are:

  1. Salts containing Group 1 elements are soluble.
  2. Most sulfates are soluble, but PbSO₄ is an important exception.

Thus, NaNO₃ is soluble and PbSO₄ is the precipitate.

7 0
3 years ago
Which of the following descriptions
tangare [24]

Answer:

D

Explanation:

depending on the solid the shape will not change.

3 0
3 years ago
Calculate the standard cell potential at 25 ∘C for the reaction X(s)+2Y+(aq)→X2+(aq)+2Y(s) where ΔH∘ = -687 kJ and ΔS∘ = -169 J/
aivan3 [116]

Answer:

-0.129V

Explanation:

The change in free energy is obtained from the given parameters after which the value is now applied to obtain the cell potential in volts from the formukar shown in the solution below.

6 0
3 years ago
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