CHEMISTRY HIGH SCHOOL

Why aliminium is use in manufacturing aeroplanes
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Answers

Answer 1
Answer:

Answer: Aluminum is ideal for aircraft manufacture because it's lightweight and strong.

Explanation:

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Write the symbols for the following isotopes: Its atoms contain 50 electrons and 70 neutrons

Answers

The symbol of an isotope that atom of its element contains 50 electrons and 70 neutrons is Tin (Sn).

What is Isotope?

The Isotope may be characterized as one of two or more types of atoms of a chemical element that significantly have the same number of protons but with different numbers of neutrons and therefore different atomic masses.

In a more simple sense, an isotope may be defined as an atom that has the same atomic number but different atomic mass and physical properties.

According to the question,

The number of electrons an atom possesses = 50.

The number of neutrons = 70.

Since, the number of electrons = the number of protons = the atomic mass of an atom = 50.

∴ According to the periodic table, an element having an atomic number of 50 is known as Tin (Sn).

Its atomic mass = the number of protons + the number of neutrons.

                          = 50 + 70 = 120 amu.

Therefore, the symbol of an isotope that the atom of its element contains 50 electrons and 70 neutrons is Tin (Sn).

To learn more about Isotopes, refer to the link:

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Since this element has 50 electrons you know that it has 50 protons. The number of proton= the atomic number. Atomic number 50 is tin. The atomic symbol for tin is Sn and the weight is 120. So this is the tin 120 isotope

A laboratory requires 2.0 L of a 1.5 M solution of hydrochloric acid (HCl), but the only available HCl is a 12.0 M stock solution. How could you prepare the solution needed for the lab experiment? show all work to find your answer

Answers

Answer: The volume of stock HCl solution required to make laboratory solution will be 0.25L

Explanation:

To calculate the volume of stock solution required to make the laboratory solution, we use the equation:

M_1V_1=M_2V_2

where,

M_1\text{ and }V_1 are the molarity and volume of stock solution.

M_2\text{ and }V_2 are the molarity and volume of laboratory solution.

We are given:

M_1=12M\nV_1=?L\nM_2=1.5M\nV_2=2L

Putting values in above equation, we get:

12* V_1=1.5* 2\n\nV_1=0.25L

Hence, the volume of stock HCl solution required to make laboratory solution will be 0.25L
The amount of the solute is constant during dilution. So the mole number of HCl is 2*1.5=3 mole. The volume of HCl stock is 3/12=0.25 L. So using 0.25 L stock solution and dilute to 2.0 L.

A solution of H2SO4 with a molal concentration of 5.25m has a density of 1.266 g/ml. what is the molar concentration of this solution?

Answers

There are a number of ways to express concentration of a solution. This includes molarity and molality. Molarity is expressed as the number of moles of solute per volume of the solution while molality is expressed as the number of moles solute per mass of solution.

Molarity = 5.25 mol / kg solution (1.266 kg / L) = 6.65 M

3.3 kg aluminum chromate

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this is not a question

Which pair of atoms can form an ionic bond?* Na, K (Sodium, Potassium)
* K, F (Potassium, Fluorine)
* F, Cl (Fluorine, Chlorine)
* Na, Ne (Sodium, Neon)

Answers

Answer: K, F (Potassium, Fluorine)

Explanation: Ionic bonds are formed by transfer of electrons between metal and non metals.

Covalent bonds are formed by sharing of electrons between non metals.

Electronic configuration of potassium:

[K]:19:1s^22s^22p^63s^23p^64s^1

Potassium atom will lose one electron to gain noble gas configuration and form K^+.

[K^(+)]:18:1s^22s^22p^63s^23p^6

Electronic configuration of fluorine:

[F]:9:1s^22s^22p^5

Fluorine atom will gain one electron to gain noble gas configuration and form F^-.

[F^-]:10:1s^22s^22p^6

In potassium fluoride the one electron from potassium metal gets transferred to fluorine atom and thus form an ionic bond to give KF

The pair of atoms that can form an ionic bond is \rm K\ , F (Potassium, Fluorine).

An atom is the basic unit of matter that consists of a nucleus, which contains positively charged protons and uncharged neutrons, surrounded by a cloud of negatively charged electrons.

In the given pair of atoms potassium and fluorine can form ionic bonds. This is because potassium has one valence electron, which it can easily lose to form a positively charged ion, while fluorine has seven valence electrons and needs one more electron to complete its outer shell. Therefore, it has a strong tendency to gain one electron to form a negatively charged ion.

  • When potassium and fluorine combine, the potassium atom loses one electron to become a positively charged ion, while the fluorine atom gains one electron to become a negatively charged ion.

The resulting oppositely charged ions are attracted to each other, forming an ionic bond.

In conclusion, \rm K (potassium) and \rm F (fluorine) are the atoms can form ionic bonds.

Learn more about atom here:

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17. Which type of chemical bond is formed between two atoms of bromine?

Answers

A non polar bond is formed between two bromine atoms. That means that the electrons are shared equally between the two atoms, and since we are sharing electrons, we use the term, 'covalent bond'.
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