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4 years ago

Does the application of heat to a substance always produce a chemical change?

Chemistry

1 answer:

tatiyna4 years ago

6 0

Answer;

No, sometimes it just causes a physical change, such as ice melting to water.

Explanation;

-The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.

Heating a substance may cause a physical change or a chemical change. For example melting ice to water, involves supplying heat to change ice into water which is a chemical change.

-On the other hand, an example of decomposition reactions are chemical reactions which involves supplying heat to a substance; for example decomposing copper (II) nitrate which yields, copper (ii) oxide, nitrogen (iv) oxide and oxygen gas, is chemical reaction.

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Identify the Lewis acid and Lewis base from among the reactants in each of the following equations.

Alex

Answer:

Part A

Ag+ is the Lewis acid and NH3 is the Lewis base.

Part B

AlBr3 is the Lewis acid and NH3 is the Lewis base.

Part C

AlCl3 is the Lewis acid and Cl− is the Lewis base.

Explanation:

A Lewis acid is any specie that accepts a lone pair of electrons. Ag^+, AlBr3 and AlCl3 all accepted lone pairs of electrons according to the three chemical reaction equations shown. Hence, they are Lewis acids.

A Lewis base donates a lone pair of electrons. They include neutral molecules having lone pair of electrons such as NH3 or negative ions such as Cl- .

3 0

3 years ago

A person walks north for 5 miles, then south for 8 miles, and then north for 6 more miles. The entire trip takes 8 hours.

Zinaida [17]

Answer:

I am not sure

Explanation:

5 0

3 years ago

If the mass is 6.5g, and the volume is 25mL.. what is the density? PLEASE ANSWER ASAP

julia-pushkina [17]

Answer:

p = 260 kilogram/cubic meter

Explanation:

ρ = $\frac{m}{V} \\$

= $\frac{6.5 g}{25mL}$

= 0.26 gram/milliliter

= 260 kilogram/cubic meter

7 0

3 years ago

Water has a high specific heat because: Select one: a. it is a poor insulator b. hydrogen bonds must be broken to raise its temp

Crank

<h2>The required "option is b) hydrogen bonds must be broken to raise its temperature.</h2>

Explanation:

Water has high specific heat due to hydrogen bonds present in it.
The Ionisation of water does not affect the specific heat of the water.
On decreasing the temperature, there is the formation of bonds hence option (d) is wrong.
On increasing the temperature, there is the breaking of bonds hence option (b) is correct.

3 0

4 years ago

How many numbers does positive atoms have

anastassius [24]

I'm not sure I'm sorry for that but I found this http://www.chem4kids.com/files/atom_ions.html

7 0

3 years ago