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3 years ago

HELP!!!!

Chemistry

1 answer:

LenKa [72]3 years ago

6 0

Answer:

The correct answer is: Only Reaction 1.

Explanation:

Ok, let us define what entropy is: entropy is a measure of the random activity in a system, and there are several factors which can affect the amount of entropy in a system - for example when you increase temperature, you increase entropy.

In this case,

Reaction 1: NaCl(s) → Na+(aq)+Cl- (aq): In this reaction you are solvating the atoms of Na+ and Cl-, or in other words, you are passing a compound from the solid state to the liquid state, which causes the entropy to increase. Liquids have more energy and entropy than solids.

Reaction 2: N2(g) + 3H2(g) → 2NH3(g): In this case you are getting a gaseous product from gaseous reactants, and although there is positive entropy, it does not increase.

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Igneous intrusion D is younger than layers B, C, and E according to

Maurinko [17]

Answer:

Law of cross-cutting relationships

Explanation:

This interpretation is based on the law of cross - cutting relationships.

This law states that "faults and fractures that cuts through a rock are younger than the rocks they cut through".

In a sequence of strata, the strata that are not cut through by these features are younger than the cross -cutting features.
The igneous intrusion is younger since it cuts through the rock layers.

6 0

3 years ago

For each pair of ions, choose the one that has the smaller radius. Na+ or Mg2+ Cl- or K+

Drupady [299]

Mg2+...because it loses 2 electron which is on its valence shell making it empty and making it have jst 2 shells. The radius calculated from d nucleus to the new valence shell is then smaller than that of Cl^- and k+

4 0

3 years ago

To separate solid particles from a liquid, you would use:

enot [183]

Filtration

hope this helped

3 0

3 years ago

Sodium Sulfide chemical formula

Yanka [14]

Answer:

Na2S

Explanation:Just took the test

8 0

3 years ago

Consider the statement: "Copper is a red-brown element obtained from copper sulfide ores by heating the ores in air, which forms

Misha Larkins [42]

Answer:

1, just I) color.

Explanation:

Physical properties are the properties that can be observed without changing the composition of a substance, such as color, temperature, density, and boiling point.

A physical change is a change in the substance that only modifies its aggregation state, such as solidification, and boiling.

Chemical properties are the properties that need a reaction to being observed, such as the combustibility, which needs a combustion reaction to being quantified.

When a chemical reaction occurs, and the composition of the substance change, it's a chemical change.

So, the heating copper with carbon is a chemical reaction, and purification by electrolysis is too. Color is the only physical property.

4 0

3 years ago