What point were the authors of the Declaration trying to make in the Preamble?

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Answer 1

Answer:

Answer:

To explain why they are revolting against the king

Explanation:

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State, in terms of subatomic particles, how an atom of C-13 is different from an atom of C-12

Answers

C-12 and C-13 are isotopes of the element carbon. Since they are both of the same element, they have the same number of protons. The number that follows the C indicates the number of neutrons. Isotopes are variations of the element with different number of neutrons. C-12 shows that that variation of carbon has 6 protons and 6 neutrons for a total mass of 12. C-13 shows that it has 6 protons but 7 neutrons for a total mass of 13

Calculate the value of ?E in joules for a system that loses 115 J of heat and has 150 J of work performed on it by the surroundings.

Answers

Hey there!:

E = energy gained (input) - energy lost (output)

∆E = 150J - 115 J

∆E = 35 J

Hope that helps!

Final answer:

The change in internal energy (?E) of the system is 35 J based on the first law of thermodynamics.

Explanation:

This problem can be solved using the first law of thermodynamics, which states that the change in internal energy (?E) of a system is equal to the heat added to it (Q) minus the work done by it (W) - this is expressed as ?E = Q - W.

In this particular case, the system loses 115 J of heat, so Q equals -115 J (as it's lost, it's negative), and 150J work is performed on the system which equals +150 J (as work is done on it, it is positive). Therefore, substituting these values into the formula, we get: ?E = -115 J - (-150 J) = 35 J:

So, the change in internal energy of the system is 35 J.

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An atom that has gained or lost electrons is called _____.a cation
an ion
inert
a molecule

Answers

It called cation, Well, When an atom gains or loses an electron, itattains a net charge and becomes an ion. When electrons are lost, theresulting ion is called cation and when electrons are gained, theresulting ion is called an anion. So, Cations have a net positivecharge, while anions have a net negative charge. it is true.

An atom that has gained or lost electrons is called an ion. The correct answer is option b.

An ion is an atom or molecule with an uneven number of protons and electrons that produces a net electrical charge.

When an atom gains one or more electrons, it becomes negatively charged and is called an anion. When an atom loses one or more electrons, it becomes positively charged and is called a cation.

For example, when sodium (Na) loses one electron, it becomes a positively charged ion or cation:

$\rm Na\rightarrow Na^+ + e^-$

Similarly, when chlorine (Cl) gains one electron, it becomes a negatively charged ion or anion:

$\rm Cl + e^- \rightarrow Cl^-$

Therefore, an ion is an atom that has gained or lost electrons. Option b is the correct answer.

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4.00 × 1023 molecules of H3PO4 have an approximate mass of

Answers

Answer : The approximate mass of $H_3PO_4$ is 65 grams.

Explanation :

First we have to calculate the moles of $H_3PO_4$ .

As, $6.022* 10^(23)$ molecules of $H_3PO_4$ present in 1 mole of $H_3PO_4$

So, $4.00* 10^(23)$ molecules of $H_3PO_4$ present in $(4.00* 10^(23))/(6.200* 10^(23))=0.664$ mole of $H_3PO_4$

Now we have to calculate the mass of $H_3PO_4$ .

$\text{Mass of }H_3PO_4=\text{Moles of }H_3PO_4* \text{Molar mass of }H_3PO_4$

Molar mass of $H_3PO_4$ = 98 g/mole

$\text{Mass of }H_3PO_4=0.664mole* 98g/mole=65.072g\approx 65g$

Therefore, the approximate mass of $H_3PO_4$ is 65 grams.

1 mole --------- 6.02 x 10²³ molecules
? mole --------- 4.00 x 10²³ molecules

moles = (4.00 x 10²³) x 1 / 6.02 x 10²³

moles = ( 4.00 x 10²³) / ( 6.02 x 10²³ )

= 0.6644 moles

Molar mass H₃PO₄ = 98.0 g/mol

mass = 0.6644 x 98.0 = 65.1112 g

hope this helps!

What stays the same when’s solution is diluted by adding more solvent