Difference between Physical and chemical changes At least six examples for each type of change

Chemistry

2 answers:

Aleksandr [31]3 years ago

7 0

Physical changes involve a new form or shape of matter

Tju [1.3M]3 years ago

4 0

Physical changes involve a new form or shape of matter,


Chemical change is any change that results in the formation of new chemical substances.

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A 5.20 mol sample of solid A was placed in a sealed 1.00 L container and allowed to decompose into gaseous B and C. The concentr

ELEN [110]

Answer:

2.60 moles of A remaining.

Explanation:

According to Le Chatelier's principle, the equilibrium would shift if the volume, concentration, pressure, or temperature changes.

In this question, we were told that the volume doubles, that implies that we would have to double the molarity of B/ C (since B=C.)

However, it is obvious and clear from the given equation of the reaction that A is solid in it's activity = 1. Hence, it is then ignored.

So doubling B would be 1.30 M × 2 = 2.60 M

i.e 2.60 M moles of A was consumed.

Now; the number of moles of A remaining is 5.20 - 2.60 = 2.60 moles of A remaining.

5 0

3 years ago

Boiling occurs when molecules being changed from liquid to gas plz tell me the answer true or false

Valentin [98]

Answer:

Liquid to Gas

Explanation:

The particles need energy to rise and over come the attractions between them as the liquid gets warmer more particles have sufficient, energy to escape from liquid. eventually even particles in the middle of the liquid form bubbles of gas in the liquid At this point the liquid is boiliing and turning into gas.

5 0

3 years ago

When a ph probe is inserted into a solution containing the chloride ion it is neutral. what is the ph of a solution containing t

Svetach [21]

Acidic! Fluoride is the most electronegative element.

4 0

4 years ago

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Microwave ovens emit microwave energy with a wavelength of 12.8 cm. What is the energy of exactly one photon of this microwave r

levacccp [35]

We are asked for the energy emitted by a photon using the wavelength given. In this case, we use the planck relation that correlates energy and wavelength using Planck's constant and speed of light as constant of proportionality. The formula is E = hc / w where h is equal to 6.626 x10-34 Js and c is equal to 3 x10 8 m/s. E then is equal to 1.55 x10-24 J

3 0

3 years ago

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Gastric juice (pH 1.5) is produced by pumping HCl from blood plasma (pH 7.4) into the stomach. Calculate the amount of free ener

Annette [7]

Given question is incomplete. The complete question is as follows.

Gastric juice (pH 1.5) is produced by pumping HCl from blood plasma (pH 7.4) into the stomach. Calculate the amount of free energy required to concentrate the H in 1 liter of gastric juice at 37 degree of centigrade. Under cellular conditions, how many moles of ATP must be hydrolyzed to provide this amount of free energy? the free energy change for ATP hydrolysis under cellular conditions is about -58 kJ/mol. Ignore the effects of the transmembrane electrical potential.

Explanation:

The given data is as follows.

Gastric juice pH = 1.5, blood plasma pH = 7.4

Temperature = $37^{o}C$ = (37 + 273) K