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4 years ago

Which substance can not be decomposed by a chemical change?

Chemistry

2 answers:

andrey2020 [161]4 years ago

7 0

Answer:

$\huge \boxed{\mathrm{A. \ Ne}}$

Explanation:

Neon cannot be broken down or be decomposed by any physical or chemical methods, because it is an element. It has properties of an element nor a compound or mixture.

Neon is a chemical element with the symbol Ne and atomic number 10.

just olya [345]4 years ago

5 0

The answer is A. Ne. You can separate the elements in the other three choices through chemical changes (dissociation, ionization, electrolysis, etc.), but in order to separate the components of Ne, you would need a nuclear reaction (to decompose the nucleus) or a physical change (to strip the nucleus of its electron cloud).

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The density of copper decreases as temperature increases (as does the density of most substances). Which change occurs in a samp

azamat

Answer: Option (c) is the correct answer.

Explanation:

As we know that density the amount of mass present in per unit volume.

Mathematically, Density = $\frac{mass}{volume}$

So, it means that density is inversely proportional to volume. Hence, when there will be decrease in density of a substance then there will be increase in its volume. That is, expansion of substance will take place.

Also, boiling point of copper is 2,562 degree celsius but we are heating it up to a temperature of 95 degree celsius. This means that copper will remain in liquid state at this temperature.

Thus, we can conclude that a change which occurs in a sample of copper is that copper sample will expand.

3 0

3 years ago

Explain why it is not a good idea to throw an arsenal canon to fire. Which gas law applies?

Feliz [49]

Answer:

is a class of heavy military ranged weapons built to launch munitions far beyond the range and power of infantry firearms. This development continues today; modern self-propelled artillery vehicles are highly mobile weapons of great versatility generally providing the largest share of an army's total firepower.

Explanation:

it could explode

6 0

3 years ago

Describe Chemical and physical changes of ice water placed in the refrigerator

Talja [164]

So in a chemical change, the product would loses its properties, would form new products and would not be easily reversed.

In a physical change, the products WILL NOT lose any of their properties, WILL NOT form any new products and WILL be easily reversed.

Talking about Water turning to ice I would say it’s all about physical change and not chemical change.
But I would suggest you to either make a research about it or ask your teacher :))

6 0

3 years ago

Consider the insoluble compound cobalt(II) hydroxide , Co(OH)2 . The cobalt(II) ion also forms a complex with ammonia . Write a

Nuetrik [128]

Answer:

4.56×10^-10

Explanation:

Co(OH)2(s)<------->Co^2+(aq) + 2OH^-(aq)

Co^2+(aq) + 6NH3(aq) ---------->[Co(NH3)6]^2+(aq)

Overall equation:

Co(OH)2(s)+ 6NH3(aq) ---------->[Co(NH3)6]^2+(aq) + 2OH^-(aq)

The increased solubility of the cobalt salt in the presence of ammonia is as a result of the formation of the hexammine cobalt II complex shown above.

Knet= Ksp×Kf

Ksp of Co(OH)2= 5.92 × 10^-15.

Kf= 7.7 x 10^4

Knet= 5.92 × 10^-15 × 7.7 x 10^4

Knet= 4.56×10^-10

Note Knet is the equilibrium constant of the overall reaction.

7 0

4 years ago

How many moles are in the number of molecules below? I only need to know the 5th question.

Arada [10]

Answer:

1. 6.02×10 23

this is the answer Hope it helps you

4 0

3 years ago