Which chemical does nicotine cause the brain to release, leading to a pleasurable sensation?

Answers

Answer 1

Answer:

Answer:

Dopamine

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When iron metal reacts with oxygen, the reaction can form Fe2O3. Write a balanced chemical equation for this reaction, and find the number of moles of oxygen that are needed to form 6 mol of Fe2O3 while showing your work.
Matter is anything that has what?
Which highly reactive gas was probably absent from the Earth's primitive atmosphere? O2 (oxygen gas) water vapor methane carbon dioxide
Which set of numbers gives the correct possible values of l for n = 2? 0 0, 1 0, 1, 2 0, 1, 2, 3

Which of the following will not have the same number of valence electrons?carbon
silicon
lead
bismuth

Answers

Bismuth will not have the same number of valence electrons.

What is valence electrons?

Valence electrons are those that are found in an atom's outermost electron shell. These electrons are involved in bonds and reactions because they are the farthest from the nucleus and as a result are less tightly held by the atom.

This implies that an element's reactivity, electronegativity, and the number of bonds it may form are all dependent on the number of valence electrons it possesses. The ability of an element to create bonds with other atoms is referred to as valence.

The number of hydrogen atoms an element can bond to (which is determined by how many valence electrons are available for bonding) has historically been used to determine an element's valence.

Therefore, Bismuth will not have the same number of valence electrons.

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Answer: The correct answer is bismuth.

Solution:

Bismuth is the member of group 15 of the periodic table.

Bismuth contains five valence electrons in its valence shell. Which can be seen from its electronic configuration:

$[Bi]=[Xe]4f^(14)5d^(10)6s^(2)6p^(3)$

Where as other three elements are the members of group 14 of the periodic table with three valence electrons in their respective valence shells.

The marathon covers 26 miles, 285 yards. Express this distance in kilometers.(1 km= 0.6214 miles, 1 inch = 2.54 centimeters)
Show calculation steps

Answers

Answer:

Conversion gives 42,107 km in total

Explanation:

A marathon covers 26 miles and 285 yards.

If 1 kilometer is 0.6214 miles, then how many kilometers are 26 miles, then:

1 km = 0.6214 miles

X = 26 miles

X = 41,841 km

Now if 1 yard is 36 inches, how many inches is 285 yards?

1 yard = 36 inches

285 yards = X

X = 10260 inches

If an inch is equal to 2.54 cm, how many centimeters are 10260 inches?

1 inch = 2.54 cm

10260 cm = X

X = 26060.4 cm

And 26060.4 cm is 0.260604 km

Finally, the sum of the distance would be:

41.841 km + 0.260604 km = 42.107 km

Given the balanced equation representing a reaction:C3H8(g) + 5O2(g)==>3CO2(g) + 4H2O(g)
What is the total number of moles of O2(g) required for the complete combustion of 1.5 moles of C3H8(g)?
(1) 0.30 mol (3) 4.5 mol
(2) 1.5 mol (4) 7.5 mol

Answers

To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. The moles of oxygen required is 7.5 mol.

What is stoichiometry?

Stoichiometry is a part of chemistry that help us in making relationship between reactant and product from quantitative aspects.

The balanced equation is

C $_3$ H $_8$ (g) + 5O $_2$ (g) $\rightarrow$ 3CO $_2$ (g) + 4H $_2$ O(g)

The mole ratio of C $_3$ H $_8$ to oxygen is 1:5, means 1 mole of C $_3$ H $_8$ will react with 5 mole of oxygen. So, if we take 1.5 moles of C $_3$ H $_8$ then the amount of oxygen that will be produced will be 5 times the moles of

C $_3$ H $_8$ . The moles of oxygen required to react with 1.5 moles of C $_3$ H $_8$ = 5× 1.5mol. Moles of oxygen required to react with 1.5 moles of C $_3$ H $_8$ =7.5 mol.

Therefore the moles of oxygen required is 7.5 mol.

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The answer is (4) 7.5 mol. The consuming of reactants has the same ratio as the balanced equation. So the ratio of consuming C3H8 and O2 is equal to 1:5. So when 1.5 mol of C3H8 consumed, 1.5*5=7.5 mol O2 consumed.

What is the element Ar classified as in the periodic table?

Answers

Ar is classified as Argon in the periodic table it is a Noble gas having atomic number 18

Me not looking at periodic table i believe its Argon.

An example of an atom that has no charge is one that hasA. 1 proton, 2 electrons, and 3 neutrons.
B. 3 protons, 1 electron, and 3 neutrons.
C. 2 protons, 2 electrons, and 1 neutron.
D. 3 protons, 2 electrons, and 1 neutron.

Answers

For an atom to have no charge, that is neutral, the number of electrons should be the same to the number of electrons. If the number of electron is more than the number of proton, the atom is negatively charged. Also, when the number of proton is more than the number of electron, the atom is positively charged. The answer to this item is letter C.

An atom consists of a postively charged nucleus that is surrounded by a negatively charged cloud of electrons . The nucleus consists of positvely charged protons and charge-neutral neutrons. An example of an atom that has no net charge is one that has two protons, two electrons and one neutron (Answer C).

What is the oxidation number for sodium?A
2-
B
1+
C
2+
D
1-

Answers

Answer:

B.) 1+

Explanation:

To obtain a full outer electron shell, sodium must lose one electron, leaving it with a plus one charge.

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