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katrin [286]
3 years ago
11

True or False, In a neutral atom, the number of protons is equal to the number of neutrons

Chemistry
1 answer:
Effectus [21]3 years ago
5 0

Answer:

False

Explanation:

In a neutral atom, the number of protons is not necessarily equal to the number of neutrons.

In such atom, the number of protons is equal to the number of electrons.

  • Protons are the positively charged particles in an atom.
  • Electrons are the negatively charged particles in an atom.
  • Neutrons do not carry any charges.

When the number of protons and electrons are the same, a neutral atom is formed.

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Write the lewis structure for ch2clcoo−. assign a formal charge for any atom with a non-zero formal charge.
Murljashka [212]
The Lewis structure of Chloroacetate (H₂CClCO₂) is given below. In structure it is shown that carbon has a double bond with one oxygen atom and two single bonds with CH₂Cl and O⁻.

Formal Charge;
                        Formal charge is caculated as,

Formal charge  =  # of valence e⁻ - [# of lone pair of e⁻ + 1/2 # of bonded e⁻]

Formal charge on Oxygen (Highlighted Red);

Formal charge  =  6 - [ 6 + 2/2]

Formal charge  =  6 - [6 + 1]

Formal charge  =  6 - [7]

Formal charge  =  -1

8 0
3 years ago
15 pts The drop down items have the same options for all sections labeled choose an item
tia_tia [17]

Answer:

#8 : 21.5 L of CH₄

#9 : 36 g of H₂O

#9 : 5.4 x 10²² molecules of CO₂

Explanation:

#8 : Part 1.

Data given:

no. of moles of CH₄ = 0.960 mol

volume of CH₄ = ?

Solution

volume can be calculated by following formula

          No. of moles = Volume of gas / molar volume

Rearrange the above equation

            Volume of gas = No. of moles x molar volume . . . . . . (1)

Where

molar volume = 22.4 L/mol

Put values in equation 1

           Volume of gas = 0.960 mol x 22.4 L/mol

           Volume of gas = 21.5 L

So,

By calculation 0.960 moles have 21.5 L volume of CH₄

_______________

#9 : Part 2.

Data given:

no. of moles of H₂O = 2.0 mol

mass of H₂O = ?

Solution

volume can be calculated by following formula

          No. of moles = mass in grams / molar mass

Rearrange the above equation

            mass in grams = No. of moles x molar mass . . . . . . (2)

Where

molar mass of H₂O = 2 (1) + 16

molar mass of H₂O = 18 g/mol

Put values in equation 2

      mass in grams = 2.0 mol x 18 g/mol

        mass in grams = 36 g

So,

By calculation 2.0 moles have 36 g mass of H₂O

________________

#10 : Part 3.

Data given:

volume of CO₂ = 2 L

no. of molecules of CO₂ = ?

Solution

First we have to find out number of moles of CO₂

Following formula will be used

          No. of moles = Volume of gas / molar volume

Where

molar volume = 22.4 L/mol

Put values in above equation

           No. of moles = 2 L / 22.4 L/mol

           No. of moles = 0.0893 mol

So,

No. of moles of CO₂ = 0.0893 mol

Now

we will calculate number of molecules by using following formula

          No. of moles = no. of molecules / Avogadro's number

Rearrange the above equation

            no. of molecules = No. of moles x Avogadro's number . . . . . . (3)

Where

Avogadro's number = 6.022 x 10²³

Put values in above equation 3

            no. of molecules =  0.0893 mol x 6.022 x 10²³

            no. of molecules =  5.4 x 10²²

So,

By calculation 2 L of CO₂ have 5.4 x 10²² molecules of CO₂

8 0
3 years ago
What impact did political parties in Africa have on the African desire for independence?
Anvisha [2.4K]
They were important to help unify the Africans in their independence. How exactly were these political parties improved? Well, they were better organized, more unified in demands, had broad support, unwilling to compromise, willing to use any means necessary.
5 0
2 years ago
Read 2 more answers
Explain why hydrogen and oxygen are considered elements whereas water is not considered an element.
Ghella [55]
Elements are the simplest building blocks you can break matter down into using purely chemical methods. They are a pure substance made up from only one type of atom.

When you mix elements together these form compounds. The important difference is that as they are a mixture of more than one type of element, they CAN be broken down into more simple substances using chemical means!

As such Hydrogen or Oxygen cannot be simplified chemically (they are therefore elements), however dihydrogen monoxide (H2O or water) is a mixture of these elements that can be broken down using chemical means and so is a compound.
5 0
3 years ago
Read 2 more answers
3.
pav-90 [236]

Answer:

=1.76gCa

Explanation:

Hello there!

In this case, according to the given atoms of calcium, it is possible to calculate the mass of this element by considering that the definition of mole is in terms of atoms and also the atomic mass of calcium:

1molCa=6.022x10^{23}atoms Ca=40.08gCa

In such a way, by considering the following setup, we can obtain:

=2.65x10^{22}atomsCa*\frac{1molCa}{6.022x10^{23}atoms} *\frac{40.08gCa}{1molCa}\\\\=1.76gCa

Best regards!

8 0
2 years ago
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