What does the chemical formula CaCl2 show about the compound it represents? It is made up of one element. It is made up of two elements. It is made up of three elements. It is made up of four elements.

Answer:

Helium will heat up the fastest

Explanation:

C

Pure water is at 7, and the bases are above 7 and the acids are below 7.

The pH of the solution that is classified as a weak base is 10. Details about weak bases can be found below.

pH of a solution refers to the degree of acidity or alkalinity of that solution.

The pH scale reads from 1 - 14 where the following applies:

A weak base will have a pH close to neutral, therefore, the pH of the solution that is classified as a weak base is 10.

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The motion of particle of bromine in liquid is less as compared to the gaseous phase.

Entropy is defined as the motion of particle how randomly a particle move.

Entropy is also defined as the no. of particle per unit surface area.

In liquid phase, the number of particle per unit surface area is greater. The particle are closer with each other through the intermolecular force of attraction. Due to which randomness of particle decreases. Hence motion of particles decreases.

In gaseous phase, the number of particle per unit surface area is lesser. The particle are less closer with each other and have less intermolecular force of attraction. Due to which randomness of particle increases. Hence, motion of particles increases.

Thus, we concluded that the motion of particle of bromine in liquid is less as compared to the gaseous phase.

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Answer:

Group 1 metals or the alkali metals

Explanation:

The group 1 elements are all metals except for hydrogen, the first element in the group. Group 1 metals have one valence electron in their outermost shell. The metallic character increases as one goes down the group.

The metallic character of an element is determined by how readily it loses electrons. Elements that lose electrons most easily have the greatest metallic character. Group 1 metals have the greatest metallic character due to the ease with which they donate or lose their one valence electron. As the atomic radius increases on going down the group, their metallic character increases. Also, due to screening effect of the inner electrons on the valence electron from the positive nuclear charge of the nucleus, metallic property increases on going down the group.

Answer:

7 moles of NaOH will produced.

Explanation:

Given data:

Number of moles of sodium oxide = 3.5 mol

Number of moles of sodium hydroxide produced = ?

Solution:

Chemical equation:

Na₂O + H₂O      →     2NaOH

Now we will compare the moles of sodium oxide with sodium hydroxide.

                 Na₂O            :         NaOH      

                    1                 :             2

                  3.5               :         2/1×3.5 = 7

7 moles of NaOH will produced.

Cumene is the end result of the reaction between benzene and 2-chloropropane when aluminum chloride is present.

Alkylation serves as an example of replacing the "alkyl group on the aromatic ring." In the alkylation reaction, the term "alkyl halides" is important. The "Lewis acid" suggested an alkylation catalyst.

Cumene is produced when the benzene molecule interacts with 2-chloropropane in the presence of aluminum chloride. By losing chlorine, the 2-chloropropane combines with aluminum chloride to produce a carbocation. Cumene is produced by further attacking benzene and protonating it.

Below is an attachment showing the cumene generation reaction.

Cumene is the end result of the reaction between benzene and 2-chloropropane when aluminum chloride is present.

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Answer: P represents electrical energy, Q represents thermal energy.

Explanation: The toaster takes electrical energy from the electrical socket through wires and converts that into thermal energy that heats up/toasts the bread.

Answer:

P represents electrical energy, Q represents thermal energy

Explanation:

I am sorry if I get this wrong, but when I put it in the sentence - A toaster transforms electrical energy into thermal energy - it made sense to me, so I think that is the answer. I am sorry if this does not help.

Answer:

Xenon

Explanation:

The reason is because, Xenon is a part of a Group on the periodic table called Noble Gases. This means that it has 8 electrons on its outer shell, making it very hard to get a reaction out of it.

Answer:

Carbon + Oxygen = Carbon Dioxide

Explanation:

You already did

Answer:

uhm yes he made her pump go off

Explanation:

Answer:

Nonmetals are further to the right on the periodic table, and have high ionization energies and high electron affinities, so they gain electrons relatively easily, and lose them with difficulty.

Explanation:

They also have a larger number of valence electrons, and are already close to having a complete octet of eight electrons.

Periodic table is divided as metals, non metals, noble gases and semiconductors. Among these nonmetals tend to have high electron affinities because of small size and high effective nuclear charge.

Non metals are the element that have property to gain electron. When any element gain electron then element attain negative charge and that element is called anion.

As we go from left to right in periodic table, the size of element decreases as number of electrons keep on adding electrons in the same shell . As the number of electrons increases, the number of proton in the nucleus also increases. Due to this, the hold of nucleus on the outermost proton increases and the size decreases. Due to this, the ionization energy increases and hence the power to gain electron increases.

Therefore, nonmetals tend to have high electron affinities because of small size and high effective nuclear charge.

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The pressure of the gas : 1.1685 atm

In general, the gas equation can be written  

[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08206 L.atm / mol K  

T = temperature, Kelvin  

n=moles=1.5

V=volumes = 30 L

T=temperature=285 K

The pressure :

[tex]\tt P=\dfrac{nRT}{V}\\\\n=\dfrac{1.5\times 0.082\times 285}{30}\\\\P=1.1685~atm[/tex]

Answer:

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

Explanation:

hope it helps, please mark as brainliest

Explanation:

Chemistry, however, plays the primary role in materials science because it provides information about the structure and composition of materials. Materials scientists study the structures and chemical properties of various materials to develop new products or enhance existing ones.

Answer:

the other person is right.

Explanation:

Answer:

The right response will be "No".

Explanation:

Answer:

C

Explanation:

I would say different points of view and listening to an argument. The local news just to "stay up to date" won't teach you much.

Answer:

b

Explanation:

all of them shows different point of veiws. none of them are biest

Answer:

I think it's d but I'm not positive

Answer:

A

Explanation:

Answer:

Ionic compounds contains ionic bond

Like NaCl

Molecular compounds contains covalent bond like H2O

And metals contains metalic bond like in copper

Explanation:

Answer:

Oxygen is denser

Explanation:

Oxygen is denser than both air and nitrogen, at all temperatures and pressures, but only slightly. Since they don't separate from each other, we generally don't worry which is lighter or heavier. The difference in the density of nitrogen and oxygen gas comes from their molecular weight, which is small (4 g/mol)

Answer:

Oxygen is denser than air.

Explanation:

This is because oxygen gas comes from its molecular weight. Also air is mainly made up of nitrogen and nitrogen is lighter than oxygen.

Answer: For a gas to become a liquid, large numbers of particles must clump together. Particles will clump together when the attraction between them overcomes their motion. For this to happen, energy must be removed from the gas to slow the particles down. So, condensation is an exothermic change.

Answer:

B: 2 moles

Explanation:

that my answer I got i think its correct

Answer:

answer c aka it is cheaper than other elements

Answer:

because it's cheap and not hard to purify

Answer:

Explanation:

The new volume can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we are finding the new volume

[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]

From the question we have

[tex]V_2 = \frac{1.23 \times 23}{15} = \frac{28.29}{15} \\ = 1.886[/tex]

We have the final answer as

Hope this helps you

Electron pairs around a central atom arrange themselves so that they can be as far apart as possible from each other. The repulsion between negatively charged electrons pairs in bonds or as lone pairs causes them to spread apart as much as possible

Explanation:

Answer:

Noble games are the least reactive because their outer shells are already full with 8 electrons.

"The number of electrons / charge of each ion tells about the property of the rection either it is single replacement reaction or double replacement reaction."

What is replacement reaction?

Replacement reactions are extremely significant chemistry phenomena. They are employed in a variety of fields. For example, it can employ electroplating, that is reliant on replacement reaction, to keep iron objects from rusting.

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Answer:

liquid

Explanation:

liquids can change shape based on what container they are in but they have a definite volume

Answer:

Liquid

Explanation: