Which occurs when two fluorine atoms react to produce a fluorine molecule? (1) Energy is absorbed as a bond is broken. (2) Energy is absorbed as a bond is formed. (3) Energy is released as a bond is broken. (4) Energy is released as a bond is formed.

Answers

Answer 1

Answer:

When two fluorine atoms react to produce a fluorine molecule, Energy is released as a bond is formed. The answer is number 4. IT takes energy to form a bond from two atoms that is why energy is releases after the bond is formed.

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Heat, like work, is an energy transfer measured in

What is combustion and how does it affect the carbon cycle?

Answers

combustion is burning and that usually produces carbon in the reaction adding it to the atmosphere

Why is calcium harder than potassium?

Answers

Because calcium atoms have smaller radii than potassium atoms since calcium atoms have a greater nuclear charge. Each calcium atom will be closer to the delocalized electrons. Thus, the bonds in calcium will be stronger than that in potassium.

Which of the following will result in a chemical change? A. Burning coal in a furnace
B. Drying wood in a shed
C. Melting ice to obtain water
D. Evaporating alcohol into vapor

Answers

Coal combustion causes a chemical change. Burning coal in a furnace will result in a chemical change. Therefore, option A is correct.

What is chemical change ?

A chemical change is the transformation of one material into another, the formation of new materials with different properties, and the formation of one or more new substances. It occurs when one substance reacts with another to form a new substance.

Coal combustion causes a chemical change. The main component, carbon, is converted to carbon dioxide when coal is burned. This process is irreversible.

When carbon is burned, it produces carbon dioxide, and hydrogen produces water. Each of these reactions generates a different amount of heat. Because this process cannot be reversed, coal combustion is a chemical change.

Thus, option A is correct.

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It would be /A/....because a chemical change is somthing that cant NOT be brought back to its areganal proproties.coal will never be able to be bavk the way it was!!

A similarity between the forces involved in both ionic and covalent bondingis that bothO A) involve the sharing of electrons.O B) involve the transfer of electrons.O C) involve the attraction of opposite charges.requre same amountof energy toereakther bonds

Answers

Stating the difference between covalent and ionic bonding....

ionic bonds consist of the transfer of electrons, and covalent consists of the sharing of electrons.

This being said..answer choices A and B are out of the picture.

Thus, answer choice C is your answer.

Involve the attraction of opposite charges;require same amount of energy to break their bonds.

a car with a mass of 1.2 × 103 kilograms is moving at a speed of 18 meters/second. It is hit by a truck from behind and its speed after the collision increases to 20 meters/second. What is the value of impulse?

Answers

2.4 × $10^(3)$ kilogram meters/ second

Answer: Value of impulse is $2.4* 10^3\text{kg m/s}$

Explanation: lmpulse is defined as the amount of force acting over a short time interval 't' which is equal to the change in momentum of the body having mass 'm'.

Mathematically,

$J=F* t=m\Delta v$

And,

$\Delta v=v_2-v_1$

Given:

$m=1.2* 10^3kg\nv_1=18m/s\nv_2=20m/s$

Putting values in above equation, we get:

$J=m(v_2-v_1)=1.2* 10^3(20-18)\text{ kg m/s}$

$J=2.4* 10^3\text{kg m/s}$

Explain, in terms of atomic structure, why the radius of an Na atom is larger than the radius of an Na+ ion.

Answers

In a Naatom, there are 11 protons controlling 11 electrons by electrostatic attraction. In Na+ there are 11 protons controlling 10 electrons (you lost one to give Na+), so they can pull them in tighter!!

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