Which statement correctly describes two forms of oxygen, O2 and O3?(1) They have identical molecular structures and identical properties.
(2) They have identical molecular structures and different properties.
(3) They have different molecular structures and identical properties.
(4) They have different molecular structures and different properties.

Answers

Answer 1

Answer:

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.

Answer 2

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

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What value was there in predicting the properties for gaps in Mendeleev's table?

Answers

Predicting the properties for gaps in Mendeleev’s table helps discover new elements. Because during his presentation of his proposed periodic table, he noted some gaps in his table and predicted that there are still unknown elements between those gaps. He uses some prefixes like dvi-, tri-, and eka- in order to give provisional names to his predicted elements. In his periodic table, he also laid out his elements from the lightest to the heaviest element. The lightest elements started from zero, some examples are gases.

Answer:

The Table helps discover new elements.

Explanation:

Rust forms when _____ reacts with chemicals in rocks.

Answers

Rust forms when oxygen reacts with chemicals in rocks, and that is often the case with many other elements in general. Like a copper nail being exposed to the air will rust.

Answer : Rust forms when oxygen reacts with chemicals in rocks.

Explanation :

Rusting : It is a chemical process in which an iron react with oxygen to give an iron(III)oxide as a product. The product iron(III)oxide formed from the chemical reaction is known as rust.

The chemical reaction will be,

$4Fe+3O_2\rightarrow 2Fe_2O_3$

Hence, rust forms when oxygen reacts with chemicals in rocks.

Convert 975 kPa to mm Hg

Answers

975 Millimeter Mercury (0°C) (mmHg)

129.98931 Kilopascal (kPa)

Zero on a pH scale is very _____, and 14 on a pH scale is very _____. A. acidic; basicB. basic; acidic

Answers

Zero on a pH scale is very A. acidic, and 14 on a pH scale is very basic.
The lower the number on the scale, the more acidic it is.

Zero on a pH scale is very

A. acidic, and 14 on a pH scale is very basic.

The lower the number on the scale, the more acidic it is.

Explanation:

Acidic and basic are two limits that describe a chemical property chemical. Mixing acids and bases can cancel out or compensate for their greatest effects. A substance that is not acidic nor basic is neutral. The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. Explications with a pH smaller than 7 are acidic and solutions with a pH higher than 7 are basic.

Torque can be calculated by multiplying the force (N) applied at 90∘ to the lever arm at a distance (m) from the pivot point (point of rotation), the compound SI unit for the torque is N⋅m. If the force (at 90∘ to the lever arm) applied is 15 N and it is applied at 2.0 m from the pivot point (point of rotation), what is the torque on the lever?

Answers

If a lever has a constant force applied at 90∘ to the lever arm at a fixed distance from the pivot point (point of rotation), the torque on the lever is given by Torque = force (at 90∘ to lever arm) × distance to pivot pointForce should be perpendicular to the lever arm
Therefore; you would do 15N X 2.0 m = 30 Nm or 30Joules

Final answer:

The torque on the lever, with a 15 N force applied perpendicular at 2.0 m from the pivot point, is 30 N·m.

Explanation:

The torque on a lever is calculated by the formula T = rF sin θ, where T is torque, r is the distance from the pivot point to the point where the force is applied (lever arm), F is the force applied, and θ is the angle between the lever arm and the direction of the force. In this case, the force is applied at 90° to the lever arm, so the sin θ part of the formula is equal to 1. Therefore, the torque can be calculated by multiplying the force by the lever arm distance. With a force of 15 N applied perpendicular to the lever arm at a distance of 2.0 m from the pivot point, the torque on the lever would be 30 N·m (15 N x 2.0 m).

Learn more about Calculating Torque here:

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Calculate the number of atoms of carbon in 3.8 moles of methane (CH4)

Answers

Total, 2.28916 × 10²⁴ atoms of carbon in 3.8 moles of methane.

To calculate the number of atoms of carbon in 3.8 moles of methane (CH₄), we need to consider the molecular formula of methane, which is CH₄. This indicates that each molecule of methane contains one carbon atom (C) and four hydrogen atoms (H).

First, let's find total number of carbon atoms in 3.8 moles of methane:

Number of moles of carbon in 1 mole of methane (CH₄) = 1 mole (because there is 1 carbon atom in each molecule of CH₄)

Number of moles of carbon in 3.8 moles of methane = 3.8 moles

Now, we'll use Avogadro's number to convert moles to the number of atoms:

Avogadro's number (NA) = 6.022 × 10²³ atoms/mol

Number of carbon atoms in 3.8 moles of methane = 3.8 moles × Avogadro's number

Number of carbon atoms in 3.8 moles of methane = 3.8 moles × 6.022 × 10²³ atoms/mol

Now, let's calculate:

Number of carbon atoms in 3.8 moles of methane ≈ 2.28916 × 10²⁴ atoms

So, there are approximately 2.28916 × 10²⁴ atoms of carbon in 3.8 moles of methane.

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There are 6.02*10^23 molecules per mole substances. And there is one carbon atom per molecule of CH4. So the atoms number is 3.8*6.02*10^23=2.29*10^24.

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