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3 years ago

In a chemical change, the substance that you end up with is the

2 answers:

7 0

Chemical changes occur when asubstance combines with another to form a new substance, called chemicalsynthesis or, alternatively, chemicaldecomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

elena55 [62]3 years ago

3 0

The reactant is what you begin with.
The product is what you end up with (so the answer is B)

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State the postulate of Bohr theory

KengaRu [80]

Answer:

Bohr's model of the hydrogen atom is based on three postulates:

1) An electron moves around the nucleus in a circular orbit,

2) An electron's angular momentum in the orbit is quantised,

3) The change in an electron's energy as it makes a quantum jump from one orbit to another is always accompanied by the emission or absorption of a photon. Bohr's model is semi-classical because it combines the classical concept of electron orbit (postulate 1) with the new concept of quantisation ( postulates 2 and ).

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3 years ago

Phosgene (COCl2) is a toxic substance that forms readily from carbon monoxide and chlorine at elevated temperatures: CO(g) + Cl2

lapo4ka [179]

Answer: Concentration of $CO$ = 0.328 M

Concentration of $Cl_2$ = 0.328 M

Concentration of $COCl_2$ = 0.532 M

Explanation:

Moles of $CO$ and $Cl_2$ = 0.430 mole

Volume of solution = 0.500 L

Initial concentration of $CO$ and $Cl_2$ = $\frac{moles}{volume}=\frac{0.430}{0.500}=0.860M$

The given balanced equilibrium reaction is,

$CO(g)+Cl_2(g)\rightleftharpoons COCl_2(g)$

Initial conc. 0.860M 0.860M 0

At eqm. conc. (0.860-x) M (0.860-x) M (x) M

The expression for equilibrium constant for this reaction will be,

$K_c=\frac{[COCl_2]}{[CO][Cl_2]}$

Now put all the given values in this expression, we get :

$4.95=\frac{x}{(0.860-x)^2}$

By solving the term 'x', we get :

x = 0.532 M

Thus, the concentrations of $CO,Cl_2\text{ and }COCl_2$ at equilibrium are :

Concentration of $CO$ = (0.860-x) M =(0.860-0.532) M = 0.328 M

Concentration of $Cl_2$ = (0.860-x) M = (0.860-0.532) M = 0.328 M

Concentration of $COCl_2$ = x M = 0.532 M

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3 years ago

Help me please (~￣_￣)~

Lubov Fominskaja [6]

Answer:

1.Temperature is the answer.

Explanation:

Hope this help!!

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2 years ago

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An atom has no electrical charge because _____.

goblinko [34]

Hey there! Great question;) Answer:It is neutrally charged, because it has the same number of electrons(negatively charged ions) and protons(positively charged ions) I hope this helps;)

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3 years ago

What is always true of a strong base

ololo11 [35]

Umm. . . Could you list some options? :)

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3 years ago

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