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2 years ago

What kind of elements generally form ionic compounds?

1 answer:

5 0

Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.

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Which is the correct Lewis structure of C2H4

Maslowich

Lewis structure for C2H4

3 0

2 years ago

Calculate the molar mass of H2SO4 + 2 NaOH = Na2SO4 + 2 H2O. Please show all work. THANK YOU!

mr_godi [17]

Answer:

30.11x10²³

Explanation;

brainleist please

7 0

2 years ago

Determine whether the following statements describe chemical or physical properties: (a) Oxygen gas supports combustion. (b) Fer

sdas [7]

Explanation:

A change that does not cause any change in chemical composition of a substance is known as a physical change.

For example, mass, density, volume etc are all physical changes.

On the other hand, a change that brings change in chemical composition of a substance is known as chemical change.

For example, combustion, toxicity, reactivity etc are all chemical changes.

Hence, following statements are identified as chemical or physical changes as follows.

(a) Oxygen gas supports combustion : Chemical change

(b) Fertilizers help to increase agricultural production : Chemical change

(d) Lead is denser than aluminum : Physical change

(e) Uranium is a radioactive element : Chemical change

7 0

2 years ago

A certain liquid has a normal boiling point of and a boiling point elevation constant . A solution is prepared by dissolving som

Andrews [41]

The given question is incomplete. The complete question is as follows.

A certain liquid has a normal boiling point of $124.2^{o}C$ and a boiling point elevation constant $k_{b} = 0.62 ^{o}C kg mol^{-1}$ . A solution is prepared by dissolving some sodium chloride (NaCl) in 6.50 g of X. This solution boils at $127.4^{o}C$ . Calculate the mass of NaCl that was dissolved. Round your answer to significant digits.

Explanation:

As per the colligative property, the elevation in boiling point will be as follows.

T = boiling point of the solution =

$T_{o}$ = boiling point of the pure solvent = $124.2^{o}C$

$K_{b}$ = elevation of boiling constant = $0.62 ^{o}C kg mol^{-1}$

We will calculate the molality as follows.

molality = $\frac{\text{maas of solute}}{\text{molar mass of solute}} \times \frac{1000}{\text{mass of solvent in g}}$

i = vant hoff's factor

As NaCl is soluble in water and dissociates into sodium and chlorine ions so i = 2.

Putting the given values into the above formula as follows.

$T - T_{o} = i \times K_{b} \times \text{molality of solution}$

$(127.4 - 124.2)^{o}C = 2 \times 0.62 \times \frac{m}{60} \times \frac{1000}{650}$

m = 100 g

Therefore, we can conclude that 100 g of NaCl was dissolved.

3 0

2 years ago

Using your periodic table, identify element X based on its average atomic mass.

77julia77 [94]

The relative atomic mass of the element is 15.99 and the element is oxygen.

<h3>What is the relative atomic mass of the element?</h3>

Let us note that owing to the fact that elements often have isotopes, the relative atomic mass is not always a whole number. Now we have tp obtain the relative atomic mas from the atomic masses of the elements.

Thus;

X = (15.99 * 0.99762) + (16.999 * 0.00038) + (17.999 * 0.002)

X = 15.95 + 0.0065 + 0.036

X= 15.99

Thus the relative atomic mass of the element is 15.99 and the element is oxygen.

Learn more about relative atomic mass:brainly.com/question/25698972

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7 0

1 year ago