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NISA [10]
3 years ago
14

The September 11th attacks were later linked to

Chemistry
2 answers:
Lubov Fominskaja [6]3 years ago
5 0
The September 11th attacks were later linked to al-Qaeda.

September 11th, 2001 was a horrible day for the Americans and the whole United States, as al-Qaeda (Sunni Islamist organization) hijacked four airliners and crashed them into the World Trade Center in New York City. Two of the planes crashed into the World Trade Center, while one crashed into the Pentagon outside of Washington, D.C., and the last one failed, resulting in the airliner crashing into a field. Sadly, over 3,000 innocent people were killed that day. In 2004, the CIA tracked down Osama Bin Laden (one of the three leaders of al-Qaeda), and killed him. Abdullah Yusuf Azzam, the second of three leaders of al-Qaeda, died by a car bomb in 1989. The third leader of al-Qaeda remains alive till this day, and the US is giving $25 million to whoever gives information about his location.
iragen [17]3 years ago
3 0
B. al-Qaeda 

The attacks were terrorist attacks linked to a group called al-qaeda. Hezbollah is an incorrect answer because he is the guy in Lebanon that has his own army. While Saddam was the iraqi guy who invaded Kuwait. 
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Match the correct definition with the correct term from questions 10-13: A. Internal energy B. Latent heat C. Chemical (bond) en
Marizza181 [45]

Answer:  A. Internal energy : May be viewed as the sum of the kinetic and potential energies of the molecules

B. Latent heat: The internal energy associated with the phase of a system.

C. Chemical (bond) energy : The internal energy associated with the atomic bonds in a molecule

D. Nuclear energy : The internal energy associated with the bonds within the nucleus of the atom itself

Explanation:

Internal energy is defined as the total energy of a closed system. Internal energy is the sum of potential energy of the system and the kinetic energy of the system. It is represented by symbol U.

Latent heat is the thermal energy released or absorbed by a thermodynamic system when the temperature of the system does not change. It is thus also called as hidden heat.

Chemical energy is the energy stored in the bonds of molecules.

Nuclear energy is the energy which is stored in the nucleus of an atom called as binding energy within protons and neutrons.

5 0
3 years ago
Out of magnesium and Calcium which element is more reactive give reason​
SIZIF [17.4K]

Answer:

Calcium is more reactive.

Explanation:

It is higher in the reactivity series, and contains more energy levels.

5 0
3 years ago
Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. For instance, it
lions [1.4K]

<u>Answer:</u> The equilibrium concentration of COF_2 is 0.332 M

<u>Explanation:</u>

We are given:

Initial concentration of COF_2 = 2.00 M

The given chemical equation follows:

                2COF_2(g)\rightleftharpoons CO_2(g)+CF_4(g)

<u>Initial:</u>          2.00

<u>At eqllm:</u>     2.00-2x          x      x

The expression of K_c for above equation follows:

K_c=\frac{[CO_2][CF_4]}{[COF_2]^2}

We are given:

K_c=6.30

Putting values in above expression, we get:

6.30=\frac{x\times x}{(2.00-2x)^2}\\\\x=0.834,1.25

Neglecting the value of x = 1.25 because equilibrium concentration of the reactant will becomes negative, which is not possible

So, equilibrium concentration of COF_2=(2.00-2x)=[2.00-(2\times 0.834)]=0.332M

Hence, the equilibrium concentration of COF_2 is 0.332 M

4 0
3 years ago
Why does no reaction occur when mixing magnesium nitrate and lithium bromide?
mixas84 [53]

Answer:

yahh

Explanation:

a precipitation reaction is a reaction that yields an insoluble product—a precipitate—when two solutions are mixed.

3 0
3 years ago
Use the following chemical equation to answer the question. 4K(s) + O2(g) → 2 K2O(s). If a staff member at a laboratory has 12.0
Allushta [10]

Answer:14.5 grams of K2O

Explanation:

4 0
3 years ago
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