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3 years ago

Is the following statement sometimes, always or never true: Compounds

Chemistry

1 answer:

e-lub [12.9K]3 years ago

3 0

Answer:

never true is the answer

explanation:

compounds are formed by two or more elements that are chemically combined with one another. They can be broken down only be chemical or electro chemical means not by physical means.

hence, the answer i have given above is correct

please mark as brainliest

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Answer: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

Ede4ka [16]

Explanation:

i dont know 8th and i am not sure baout carbonic acid in 10 th but they are balanced

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3 years ago

Select all that apply.

agasfer [191]

As the larger quantity.

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3 years ago

Read 2 more answers

The isotope of an atom containing 31 protons and 39 neutrons suddenly has two neutrons added to it.

xxTIMURxx [149]

Answer:

Gallium-72

Explanation:

The elements are identified by the number of protons of the atom, which is its atomic number.

In this case the number of protons 39 (atomic number 39) permit you to identify the element as gallium.

Now, to identify the isotope you tell the name of the element and add the mass number.

The mass number is the sum of the protons and the neutrons

In this case, the number of neutrons is the original 39 plus the 2 added suddenly, i.e. 39 + 2 = 41, so the mass number is 31 + 41 = 72

Therefore, the isotope is gallium - 72.

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3 years ago

Compared to a solution with a ph value of 7, a solution with a thousand times greater hydronium ion concentration has a ph value

Mandarinka [93]

Answer:

pH = 4

Explanation:

pH is a base 10 logarithmic scale

1000 = 10^3

7 -3 = pH = 4

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2 years ago

A gas is contained in a tick walled balloon. When the pressure changes from 2. 95atm to ___atm, the volume changes from 7. 456L

tia_tia [17]

A gas is contained in a tick-walled balloon. When the pressure changes from 2. 95atm to 2.57 atm. p.

<h3>What is pressure?</h3>

Pressure is a force perpendicular to the unit area on which it is applied.

Given that, P1, the initial pressure is 2.95 atm

The initial volume, V1 = 7.456 L

The final volume, V2 = 4.782 L

The initial temperature, T1 = 379k

The final temperature, T2 = 212k

The equation will be

$\dfrac{P_1V_1}{T_1 } =\dfrac{P_2V_2}{T_2}$

Putting the values in the equation

$\dfrac{2.95 \times 7.456 L }{379k } =\dfrac{P_2\times 4.782 L}{212k}\\\\\\P_2 = \dfrac{2.95 \times 7.456 L \times 212k }{379k \times 4.782 L} = 2.57\;atm.$

Thus, the pressure changes from 2. 95atm to 2.57 atm p.

Learn more about pressure

brainly.com/question/12971272

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3 years ago