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3 years ago

What type of substance contains more than one kind of element joined by chemical bonds?

1 answer:

3 0

The answer is compound. Elements are composed of one kind of atoms bonded together. There are different types of compounds: ionic, complexes, molecular, and intermetallic compounds. The proportion of elements in the compound is expressed using a chemical formula. An example of an element is Aluminium while an example of a compound is H2S (Hydrogen sulfide).

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A molecule of carbon dioxide (co2) is formed when one atom of carbon (atomic number 6) is covalently bonded with two atoms of ox

xxMikexx [17]

Carbon must share 4 electrons total with the the two Oxygen atoms in order to fill it's outer electron shell, and each Oxygen atom must share 2 electrons with the Carbon atom to fill their electron shells. Therefore, in total 8 electrons must be shared (4+2+2=8)

4 0

3 years ago

Find density of nitrogen dioxide at 75*C and 0.805 atm.

Eva8 [605]

Answer:

1 (348) (D2) = 273 (2.05) (0.805) D2= 1.29 g/L

Explanation:

5 0

3 years ago

What is the value for AG at 5000 K if AH = -220 kJ/mol and S= -0.05 kJ/(mol-K)?

Serhud [2]

Answer:

C. 30 kJ

Explanation:

Hello there!

In this case, in agreement to the thermodynamic definition of the Gibbs free energy, in terms of enthalpy of entropy:

$\Delta G= \Delta H-T\Delta S$

It is possible to calculate the required G by plugging in the given entropy and enthalpy as shown below:

$\Delta G=-220kJ/mol-5000K*-0.05kJ/mol*K\\\\\Delta G=30kJ/mol$

Therefore, the answer is C. 30 kJ .

Best regards!

4 0

2 years ago

The energy released from 1 gram of uranium is more than 1 million times greater than the energy released from 3 grams of coal. T

SVEN [57.7K]

The energy released from 1 gram of uranium is more than 1 million times greater than the energy released from 3 grams of coal is True.

Explanation:

Nuclear Fission is the process in which splitting of a nucleus takes place that releases free neutrons and lighter nuclei. The fission of heavy elements like "Uranium is highly exothermic" and releases "200 million eV" compared to the energy that is released by burning coal which gives a few eV.

In the given example, it is obvious that the energy released from 1 gram of uranium is more than that of the energy released from 3 grams of coal because the amount of energy released during nuclear fission is millions of times more efficient per mass than that of coal considering only $\frac{1}{10}^{th}$ part of the original nuclei is converted to energy.

5 0

3 years ago

Cis-trans isomers (geometric isomers) are molecules that _____. A) are isomers in which one of the molecules contains an amino g

Paul [167]

Answer:

C) differ in the arrangement of their atoms about a double bond

Explanation:

Cis-trans isomers -

Isomers are the molecules which have the same molecular formula but they differ in their arrangement of atoms.

The two isomers possible are the cis and the trans isomer .

1. Cis - isomer - The priority group or the similar group are at same side of the double bond .

2. trans - isomer - The priority group or the similar group are at different side of the double bond . ( the group are diagonally present )

Hence , the option about cis - trans isomer is ( c ) .

7 0

3 years ago