Chemistry, 07.01.2020 05:31 ericavasquez824

Which is considered an indication that a chemical reaction or chemical change has taken place a: solid melts b: heat is given off c: substance dissolves d: substance change shape

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Answer from: yesimabadbih5147

B: heat is given off C:

Explanation:

Physical Change

The changes that occur only due to change in shape or physical properties but their chemical or internal composition remain unchanged.

These changes were reversible.

They have same chemical property.

These changes can be observed with naked eye.

Example :

Water converting to Ice

Water converting to gas

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible

These changes occur due to chemical reactions

These may not be observed with naked eye

Example:

Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood

So in given data the heat is given off indicate the chemical change while others

Solid melts

Substance dissolve

Substance change shapes are physical changes because no new product is obtained there is no indication of chemical reaction.

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For cyclohexane compounds drawn in a chair conformation: -axial bonds are vertical -equatorial bonds are parallel to two bonds within the ring. thus, as i assume the chair conformation is drawn: -the x group is in an axial position, as are the five other vertical bonds. -three axial bonds are on the top face of the ring -the other three axial bonds are on the bottom face the position of the second substituent on each ring carbon is equatorial. gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other. drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1. click this link and watch some academic videos that may you more understand the topic

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Which is considered an indication that a chemical reaction or chemical change has taken place a: sol...