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mestny [16]
3 years ago
5

PLS HELPPPP

Chemistry
1 answer:
Nady [450]3 years ago
5 0

Answer:

1. First one is true : as per periodic table down the group , the elements has increasing order of shell & with that the London dispersion forces brings the inter-molecules close together and bromine converted into liquid .

2. second one is False  because carbon-carbon bonds are not weak bonds they form mutual covalent bonds which are stronger bonds and cannot be easily disrupted .

3. A single carbon atom has the valency of 4 so it can be bonded with four hydrogen atom at the same time .

Explanation:

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most events like the rising and setting of the Sun were used a natural measurement of time until recently.

Solar time, which is based on the motion of the Sun, is not the only way of measuring time, however. One might keep track of the regular appearance of the full Moon. That event occurs once about every 29.5 solar days. The time between appearances of new moons, then, could be used to define a month.

One also can use the position of the stars for measuring time. The system is the same as that used for the Sun, since the Sun itself is a star. All other stars also rise and set on a regular basis.

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1-The chemical potential energy of bond A is greater than the chemical potential energy of bond B. Which statement best explains
Tju [1.3M]

It should be noted that bond A has greater energy because C. The atoms in bond A are held more tightly together than the atoms in bond B.

<h3>Bond</h3>

The relationship between the bond energies of nitrogen, iodine, and fluorine gases is that the bond in nitrogen gas is the most difficult to break.

From the information given, the molecule with the greatest bid energy is CH4. The bind energy measures the bond strength that the chemical bond has.

Also, the bond energy of the reactants in reaction 1 is greater than the bond energy of the reactants in reaction 2. Due to this, reaction 1 requires a greater input of energy than reaction 2.

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A substance has a volume of 50L and a density of 10.36g/l. What is the mass of the substance?
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Answer:

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How many atoms are in 25.00 g of B.
iren2701 [21]

Answer:

\boxed {\boxed {\sf 1.393 *10^{24} \ atoms \ B}}

Explanation:

<u>1. Convert Grams to Moles</u>

Use the molar mass (found on the Periodic Table) to convert from grams to moles.

  • Boron (B): 10.81 g/mol

Use this value as a ratio.

\frac {10.81 \ g \ B }{1 \ mol \ B}

Multiply by the given number of grams.

25.00 \ g \ B *\frac {10.81 \ g \ B }{1 \ mol \ B}

Flip the ratio so the grams of boron cancel out.

25.00 \ g \ B *\frac {1  \ mol \ B }{10.81 \ g \ B}

25.00 *\frac {1  \ mol \ B }{10.81 }

\frac {25.00 \ mol \ B }{10.81 }=2.312673451 \ mol \ B

<u>2. Convert Moles to Atoms</u>

We use Avogadro's Number, 6.02*10²³: the number of particles (atoms, molecules, etc.) in 1 mole of a substance. In this case, the particles are atoms of boron.

\frac {6.02*10^{23} \ atoms \ B} {1 \ mol \ B}

Multiply by the number of moles we calculated.

2.312673451 \ mol \ B *\frac {6.02*10^{23} \ atoms \ B} {1 \ mol \ B}

The moles of boron cancel.

2.312673451  *\frac {6.02*10^{23} \ atoms \ B} {1 }

2.312673451  *6.02*10^{23} \ atoms \ B} =1.39269195*10^{24} \ atoms \ B

The original value of grams has 4 significant figures, so our answer should have the same. For the number we calculated, that is the thousandth place.

1.392\underline69195*10^{24} \ atoms \ B

The 6 tells us to round the 2 to a 3.

1.393 *10^{24} \ atoms \ B

25.00 grams of boron is equal to 1.393*10²⁴ atoms.

6 0
3 years ago
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