Which of the following about sodium atoms(Na) is NOT correct?

1. All neutral sodium atoms have 11 protons
and 11 electrons.

2. All sodium atoms have the atomic number
11.

3. All sodium atoms have the same number
of protons.

4. All sodium atoms have 11 neutrons.

5. All atoms with atomic number 11 are
sodium atoms.

Answers

Answer 1

Answer:

All neutral sodium atoms have 11 protons and 11 electrons is about sodium atoms (Na) is not correct. Therefore, option 1 is correct.

Which are neutral atoms?

When an atom has the same number of electrons and protons, it has the same number of negative (electrons) and positive (protons) electric charges (the protons).

As a result, the total electric charge of the atom is zero, and it is said to be neutral. As a result, all elements in the periodic table have neutral atoms.

The sodium atom contains 11 electrons. As sodium atom loses one electron to form sodium ion, sodium ion has ten electrons. Only sodium atoms have a strong reaction with water, whereas sodium ions do not.

Thus, All neutral sodium atoms have 11 protons and 11 electrons is about sodium atoms (Na) is not correct, option 1 is correct.

To learn more about the neutralatom, follow the link;

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#SPJ2

Answer 2

Answer:

Answer:

1 is not correct ......

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What is the value of 100 ºC on the Kelvin scale? 100 K

Answers

Answer : The temperature on the Kelvin scale is, 373 K

Solution :

As temperature is given $100^oC$ . Now we have to determine the temperature in Kelvin scale.

Formula used :

$K=273+^oC$

K = temperature in kelvin = ?

$^oC$ = temperature in degree Celsius = $100^oC$

Now put the value of 'K' in the above formula, we get the temperature in kelvin scale.

$K=273+100\n\nK=373$

Therefore, the temperature on the Kelvin scale is, 373 K

0 C = 273 K . . . . 100 C = 373 K

What does Mg stand for in chemistry

Answers

Mg is an element that stands for Magnesium.

Mg is the chemical symbol for Magnesium.

- - In relation towards chemistry, Mg is equal to and standing for magnesium(mg).

End-of-chapter questionsi Apart from saving money, why is it important to recycle as many substances as possible?2 A farmer uses slaked lime (Ca(oH),) and ammonium sulfate to increase the fertility of his fieldsa What type of soil might the farmer use lime on?b which essential element will ammonium sulfate add to the soil?c What reaction could take place between slaked lime and ammonium sulfate?Lime (Cao) is manufactured from limestone by heating it strongly.d What is the chemical formula oflimestone?48Cambridge IGCSE Chemistry

Answers

1. to save space as less goes to landfill
2. acidic soil as OH is alkali
3. nitrates (ammonia is nitrogen and hydrogen)
4. I don't know this one sorry
5. CaCO3 is limestone and when it is heated its called thermal decomposition

Which statement explains why a C–O bond ismore polar than a F–O bond?
(1) At STP, carbon has a greater density than
fluorine.
(2) A carbon atom has more valence electrons
than a fluorine atom.
(3) The difference in electronegativity between
carbon and oxygen is greater than that
between fluorine and oxygen.
(4) The difference in first ionization energy
between carbon and oxygen is greater than
that between fluorine and oxygen.

Answers

Answer: (3) The difference in electronegativity between carbon and oxygen is greater than that between fluorine and oxygen.

Explanation: Polarity of a molecule is due to the difference in electronegativity of the atoms. More is the electronegativity difference, more is the polarity.

Electronegativity of carbon = 2.5

Electronegativity of oxygen = 3.5

Electronegativity of fluorine = 4.0

Thus the difference in electronegativity of carbon and oxygen is=(3.5-2.5)= 1.0

Thus the difference in electronegativity of fluorine and oxygen is=(4.0-3.5)= 0.5.

Thus C-O bond is more polar than F-O bond.

The correct answer is statement 3, the difference in electronegativity between carbon and oxygen is greater than that between fluorine and oxygen. The most polar bond is the one with the highest difference in electronegativity values between two atoms. In this case, the C-O bond.

Which substances dissolves in pure water and produces a solution that is a good conductor of electricity?1) CaCl2
2) C6H12O6
3) N2
4) O2

Answers

Answer:

$CaCl_2$

Explanation:

We have to keep in mind that a good conductor would be a substance that has the ability to produce ions (charged species). These species are responsible for the electricity conduction on water.

Therefore, we have to check which ones of these compounds will produce ions in water. For $N_2$ and $O_2$ we have diatomic molecules (also gases) this type of molecules don't have the ability to produce ions due to his simplicity, they already are very stable.

In the sugar molecule $C_6H_12O_6$ we have a covalent compound. The ions are produced by ionic compounds. So, this molecule can be discarded too.

For $CaCl_2$ we have an ionic compound that have the ability to produce ions:

$CaCl_2~~->~~Ca^+^2~+~2Cl^-$

So, this is the compound that would be a good conductor due to the $Ca^+^2$ and the $Cl^-$ ions.

CaCl2 is a good conductor of electricity when dissolved in water.

Please help!The following gases are at STP. Which one will diffuse the fastest? O2, H2, SO2, NO, NH3
O2
H2
NH3
NO
SO2

Answers

Hydrogen will defuse the fastest because it is the lightest

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