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Agata [3.3K]
3 years ago
10

In an exothermic the change in enthalpy is usually

Chemistry
1 answer:
marusya05 [52]3 years ago
7 0

Answer:

Negative, because the potential energy of the reactants is higher than the potential energy of the products

Explanation:

Exothermic reaction is a reaction in which heat is released to surrounding. This is due to the fact that the heat content of the reactant is higher than the heat content of product thus producing a negative enthalpy change (ΔH) i.e

Enthalpy change = Heat of product – Heat of reactant

ΔH = Hp – Hr = negative

Considering the options given in the question above, the correct answer is:

Negative, because the potential energy of the reactants is higher than the potential energy of the products

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What is a atom of chemistry
Yuliya22 [10]

Answer:

Atom is the smallest particle of matter.

Elements are made up of same atoms.

Atom consist of electron, proton and neutron.

Explanation:

Atom was first discovered by John Dalton.

word "Atom" came from Greek word, that means something that could not split. he explained that atom is indivisible particle.

In the end of 18th century J.J. Thomson put forward a new concept of atom. he said that atom have negative charged particles called electrons but overall atom is neutral.

In 1909 Rutherford with his students discovered positive charged particles and nucleus and said that it is in the center of atom.

He explain a model of atom and said that electrons revolve around a hard core in the center called nucleus.

In 1913 Niels Bohr  explains the atomic spectra and put forward the concept of shells and sub-shells.

So overall Structure of an Atom is

  • consist of Neutrons in nucleus
  • +ve charged protons in nucleus
  • A -vely charged electrons revolving around the nucleus
  • the electron revolve in shells i.e. K, L, M, and N
  • Each shell divide in sub-Shell such as s, p,d and f.

Atom has a specific atomic mass and atomic number

Atomic number = number of protons or electron

Atomic mass = number of protons +  number of neutrons in nucleus.

8 0
4 years ago
Why is a saturated NaCl solution an example of an equilibrium system?
IRINA_888 [86]
The reversible of nature  of crystasllizing & dissolving
8 0
3 years ago
Read 2 more answers
What is the chemical name for the compound IFs?<br> Select the correct answer.
mariarad [96]
Is this a answer multiple choice or u just answer it
6 0
3 years ago
5) What is the difference between CO2 and XeCl2? The difference between SCl2, SCl4, and SCl6?
nadezda [96]

CO₂ has 4 + 2(6) = 16 valence electrons

CO₂ have linear molecular structures with a 180° bond angle. CO₂ is nonpolar  because the individual bond dipoles cancel each other out

XeCl₂ has 8 + 2(7) = 22 valence electrons.

There are five pairs of electrons about the central Xe atom. The structure will be based  on a trigonal bipyramid geometry. The most stable arrangement of the atoms in XeCl₂ is  a linear molecular structure with a 180° bond angle. It is nonpolar because the Xe−Cl bond dipoles  and lone pairs around Xe are arranged in such a manner that they cancel each other out.

(b)

SCl₆ is nonpolar because it has 6 bonding pairs and no lone pairs, giving it an octahedral shape. When you draw the vectors, you can see that the resultant is 0, making it nonpolar.

SCl₄ on the other hand is polar because it has 4 bonding pairs and one lone pair, giving it a trigonal pyramidal shape.

SCl₂ is also polar due to reasons similar to those in the case of SCl₄.

7 0
3 years ago
The Andes Mountains are found along the western coast of South America. Which kind of plate boundary is responsible for this mou
lozanna [386]

The Nazca plate is converging with the South American plate.

Explanation:

The Andes Mountains are formed as a result of the convergent of the Nazca plate and the South American plate.

This mountain range typifies the geology and geography of the South American continent.

  • Along this convergent margin, one plate subducts beneath the other.
  • The oceanic plate due to its density goes into the mantle.
  • The causes the continent riding to obduct and be forced.
  • With rising magmatic bodies beneath, the continent further pushes up to form the Andes ranges.

Learn more:

Lithosphere brainly.com/question/9582362

#learnwithBrainly

3 0
3 years ago
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