A scientist carries out a reaction twice. In Trial A, the scientist combines the reactants in a container. In Trial B, the scientist combines the reactants in the same container, but she also adds a catalyst. If everything else is the same about the two trials, what is most likely true about Trial B?

Answers

Answer 1

Answer:

Trail B will have a lower activation energy than trail A because in this trial the scientist added a catalyst.

What is a catalyst?

A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process.

A catalyst is a substance that speeds up a chemical reaction or lowers the temperature or pressure needed to start one, without itself being consumed during the reaction.

Catalysts slow down reaction rates which will in turn mean a loweractivation.

Hence, trail B will have a lower activation energy than trail A because in this trial the scientist added a catalyst.

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Answer 2

Answer:

Answer:

It will have a lower activation energy than Trial A.

Explanation:

Trail B will have a lower activation energy than trail A because in this trial the scientist adds a catalyst. Catalysts slow down reaction rates which will in turn mean a lower activation.

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In the process of ionization, what is the relationship between the second ionization energy and the third ionization energy?

Answers

The first ionization energy is the energy it takes to remove an electron from a neutral atom. The second ionization energy is the energy it takes to remove an electron from a 1+ ion. (That means that the atom has already lost one electron, you are now removing the second.) The third ionization energy is the energy it takes to remove an electron from a 2+ ion. (That means that the atom has already lost two electrons, you are now removing the third.)
And 2nd ionization energy is higher than 1st ionization energy, 3rd is higher than 2nd, and so forth.

Compared to H2S, the higher boiling point of H2O is due to the1.
greater molecular size of water
2.
stronger hydrogen bonding in water
3.
higher molarity of water
4.
larger gram-formula mass of water

Answers

$\rm H_2O$ has higher boiling point than $\rm H_2S$ , as there has been stronger hydrogen bonding in $\rm H_2O$ . Thus, option 2 is correct.

The boiling point has been the temperature at which the liquid has been converted to the gaseous form. The boiling point has been based on the intemolecular attractions between the atoms.

Higher boiling point

Based on the intermolecular interactions, the compound with higher intermolecular force required more energy to break the bond and change the state, and thus have high boiling point.

The hydrogen sulfide and water has hydrogen bonding. The hydrogen bonding has been based on the electronegativity of the atom involved. The more electronegative atom, stronger will be hydrogen bonding and thereby higher boiling point.

In $\rm H_2S$ and $\rm H_2O$ , the oxygen has been more electronegative than sulfur and thus results in stronger hydrogen bonding.

Thus, $\rm H_2O$ has higher boiling point than $\rm H_2S$ , as there has been stronger hydrogen bonding in $\rm H_2O$ . Thus, option 2 is correct.

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Answer:

2, stronger hydrogen bonding

Explanation:

Which of the following combinations would result in the largest attractionbetween particles?
Large charges close together
Small charges close together
Large charges far apart from each other
OSmall charges far apart from each other

Answers

Answer:

Explanation:

Large charges close together maybe

Chemical reactions can be detected by changes in

Answers

Chemical reactions can be detected by some of these changes:
1. change of color
2. formation of a solid
3. formation of gas
4. exchange of heat with surroundings

Write the symbols for the following isotopes: Its atoms contain 50 electrons and 70 neutrons

Answers

The symbol of an isotope that atom of its element contains 50 electrons and 70 neutrons is Tin (Sn).

What is Isotope?

The Isotope may be characterized as one of two or more types of atoms of a chemical element that significantly have the same number of protons but with different numbers of neutrons and therefore different atomic masses.

In a more simple sense, an isotope may be defined as an atom that has the same atomic number but different atomic mass and physical properties.

According to the question,

The number of electrons an atom possesses = 50.

The number of neutrons = 70.

Since, the number of electrons = the number of protons = the atomic mass of an atom = 50.

∴ According to the periodic table, an element having an atomic number of 50 is known as Tin (Sn).

Its atomic mass = the number of protons + the number of neutrons.

= 50 + 70 = 120 amu.

Therefore, the symbol of an isotope that the atom of its element contains 50 electrons and 70 neutrons is Tin (Sn).

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Since this element has 50 electrons you know that it has 50 protons. The number of proton= the atomic number. Atomic number 50 is tin. The atomic symbol for tin is Sn and the weight is 120. So this is the tin 120 isotope

The percentage by mass of Br in the compoundAlBr3 is closest to
(1) 10.% (3) 75%
(2) 25% (4) 90.%