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3 years ago

Which statement correctly describes two forms of oxygen, O2 and O3?

Chemistry

2 answers:

fgiga [73]3 years ago

7 0

The two forms of oxygen, O2 and O3 is "They have different molecular structures and different properties."

harkovskaia [24]3 years ago

4 0

Answer: Option (4) is the correct answer.

Explanation:

In an $O_{2}$ molecule there are two oxygen atoms and in a $O_{3}$ molecule there are three oxygen atoms.

So, there will be different number of electrons involved in the bonding of atoms for both $O_{2}$ and $O_{3}$ molecules.

Therefore, both of them will have different structure and reactivity.

Thus, we can conclude that the statement they have different molecular structures and different properties, correctly describes two forms of oxygen, O2 and O3.

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Calcium nitrate tetrahydrate dissolves in cold water to the extent of 266 g per 100 cm3. What is the concentration of nitrate io

Soloha48 [4]

Answer : The correct option is, (b) 22.5 M

Explanation : Given,

Mass of calcium nitrate tetrahydrate = 266 g

Molar mass of calcium nitrate tetrahydrate = 236.15 g/mole

Volume of solution = $100cm^3=100mL$

Molarity : It is defined as the moles of solute present in one liter of solution.

Formula used :

$Molarity=\frac{\text{Mass of calcium nitrate tetrahydrate }\times 1000}{\text{Molar mass of calcium nitrate tetrahydrate }\times \text{volume of solution in ml}}$

Now put all the given values in this formula, we get:

$Molarity=\frac{266g\times 1000}{236.15g/mole\times 100ml}=11.26mole/L=11.26M$

As calcium nitrate tetrahydrate dissociate to give 1 mole of calcium ion, 2 moles of nitrate ion and 4 moles of water.

The concentration of nitrate ion = $2\times 11.26M=22.5M$

Thus, the concentration of nitrate ion is, 22.5 M

4 0

3 years ago

At which condition will the entropy of a pure solid be zero?

miss Akunina [59]

The condition at which the entropy of a pure solid will be zero is when a substance is at absolute zero. Absolute zero is the lowest temperature that is theoretically possible, at which the motion of particles which constitutes heat would be minimal. It is zero on the Kelvin scale, equivalent to −273.15°C.

5 0

3 years ago

Read 2 more answers

Do all electrodes make good canthodes and anodes? why or why not

Sedbober [7]

An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit The word was coined by William Wheel at the request of the scientist Michael Faraday from the Greek words electron, meaning amber and hods, a way.

4 0

3 years ago

Balance the following half-reaction: (acidic) NO−3(aq) → NO2(aq) Express your answer as a half-reaction. Identify all of the pha

Marrrta [24]

Answer:

2H⁺ + NO₃⁻ + 1e⁻ → NO₂ + H₂O

Explanation:

NO₃⁻ → NO₂

In left side, Nitrogen acts with +5 by oxidation number

In right side, the oxidation number is +4

This is a reduction reaction, because the oxidation number has decreased. So the N has gained electrons.

NO₃⁻ + 1e⁻ → NO₂

In acidic medium, we have to add water, where there are less oxygens to ballance the amount. We have 2 O in left side, and 3 O in right side, so we have to add 1 H₂O on left side.

NO₃⁻ + 1e⁻ → NO₂ + H₂O

Now that oxygens are ballanced, we have to ballance the hydrogens by adding protons in the opposite side

2H⁺ + NO₃⁻ + 1e⁻ → NO₂ + H₂O

8 0

3 years ago

Which procedure must be completed before switching to high power objective on a microscope

Elis [28]

1.turn the revolving turret so that low power lens come into position
2 place the microscope slide on the stage
3 look at the objective lens and the stage from the side as you turn adjust knob so that stage can move upward
4 look through the eyepiece and move the focus knob until image come into focus
5.adjust the condenser to regulate thee amount of light
6 move the microscope slide around until the sample is in the center of field of view

7 0

4 years ago