Which of the following is the formula of a
compound?
(1) Fr
(2) Mn
(3) LiH
(4) 03

Answer:

Ans no 1. As magnesium used to react with oxygen and due to the reaction the mass (weight) of magnesium increases , this reaction between oxygen and magnesium which form magnesium oxide in the air by forming white smoke increases the mass of magnesium

Answer:

0.086

Explanation:

got it on acellus

The mass of the dry solute recovered from the given data is 0.086 g.  Option C

To determine the mass of the dry solute recovered, we need to subtract the mass of the boat from the mass of the boat with the dry solute.

Given the data provided:

Boat Mass: 0.730 g

Boat + Solution: 0.929 g

Boat + Dry: 0.816 g

To find the mass of the dry solute, we subtract the boat mass from the boat + dry mass:

Mass of Dry Solute = (Boat + Dry) - (Boat Mass)

Mass of Dry Solute = 0.816 g - 0.730 g

Mass of Dry Solute = 0.086 g

Therefore, the correct answer is c) 0.086 g.

The mass of the dry solute recovered from the given data is 0.086 g. It is important to note that the mass of the dry solute is obtained by subtracting the mass of the boat from the mass of the boat with the dry solute, as the boat mass represents the weight of the empty boat or container used in the experiment.

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Answer:

Neutrons

Explanation:

Isotopes are variations of an element that differ from the number of neutrons.

Answer:

Stage 3 or long-term immersion hypothermia happens after 30 minutes or more. Cold water pulls heat from the body, and the body’s core temperature drops. This eventually leads to loss of consciousness and death.

The endpoint and equivalence point are two significant phases that are attained throughout the procedure.

The chemical equivalent between the added titrant and the sample analyte is referred to as the point of equivalence in a titration. Endpoint, on the other hand, is the location where the color of the solution changes. The equivalence point, or the ideal point for the termination of the titration, occurs when the moles of a standard solution (the titrant) equal the moles of a solution of unknown concentration (the analyte). At the titration's equivalence point, just enough titrant is given to totally neutralize the analyte solution.

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Answer: movement of continent

Explanation:

The Movement of Continents affects the global patterns of winds and ocean currents, which slowly changes climates.

We should note that the ocean currents moves water from the equator and moves them toward the poles and vice versa. This therefore leads to the regulation of ocean currents. This in turn, lead to changes in the climates.

Answer:

Generally, all atoms of elements contain three sub-atomic particles- Protons(Positively-charged), Neutrons(Neutral) and Electrons(Negatively-charged).

The Magnitude of the Positive Charge possessed by the Protons and the Magnitude of the Negative Charge possessed by the Electrons cancel each other, which make the atom electrically neutral.

Hence,

Without any electrons, the magnitude of the positive and negative charges wouldn't balance, and the atom would be unstable and disintegrate almost immediately. Hence, all stable atoms should have electrons revolving around them, where the number of protons and electrons are the same, under normal conditions.

To Conclude,

Every atom of an element will have electrons arranged in different shells, or matter couldn't exist without electrons.

The correct order of increasing dipole moment is BCl3 < BIF2 < BClF2.

What is dipole moment?

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question we have

mass = 15 g

volume = 9 cm³

\(density = \frac{15}{9} = 1.67 \\ \)

We have the final answer as

The object will sink in water since it has a density greater than that of water which is 1 g/cm³

Hope this helps you

Answer:

False

Explanation:

Shiny materials reflect radiant energy.

& it was on quizlet :)

An electron in a hydrogen atom will normally produce a photon of light to return to its initial energy level after absorbing 10.2 eV of energy and going from level 1 to level 2.

An electron neither emits nor absorbs radiation when it is in an energetic state. When an electron changes from one energy level to another, a photon is either emitted or absorbed.

A potential energy diagram, also known as a reaction progress curve, is a visual representation of the energy changes that take place during a chemical reaction.

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Answer:

The reaction is exothermic as the solution becomes warm.

Explanation:

Hello there!

In this case according to the described reaction between sodium metal and water, we can write up the chemical equation whereas the products turn out to be sodium hydroxide and hydrogen gas:

\(2Na+2H_2O\rightarrow 2NaOH+H_2\)

Moreover, these reactions are known to be highly exothermic, for that reason the solution becomes warm as the reaction releases heat as it goes to completion.

Best regards!

a- Aluminium bromide has the following formula: AlBr₃, so the unbalanced equation is:

As we can see, for now the aluminium atoms are balanced, but the bromine is not. To balance the bromine, we can put 3 in front of Br₂ and 2 in front of AlBr₃. That way, we will have a total of 6 bromine atoms in each side:

But now the Al is unbalaced, so to fix it we can add a 2 in front of Al to get the balanced equation:

b- The aluminium are the lone atoms, so, counting them, we see that there are 8 atoms initially.

c- Each pair of empty circles represent a molecule of Br₂, counting them we have 6 molecules initially.

d- The proportion of Al to AlBr₃ is 2:2, that is, 1:1, so if all Al reacts, we would produce the same amount of AlBr₃ as Al, which would be 8 molecules.

The proportion of Br₂ to AlBr₃ is 3:2, so is all Br₂ reacts we will get 2/3 of that as AlBr₃, which would be 6*2/3 = 4 molecules.

This shows that there is not enough Br₂ to react with all 8 atoms of Al, meaning only 4 molecules of AlBr₃ will be produced.

e- Since there is not enough Br₂ to react with all Al present, the limiting reactant is the bromine.

f- The excess reactant is the other one, so if bromine is the limiting, the aluminium is the excess reactant.

g- Since only 4 molecules of AlBr₃ will be formed with all the bromine present, since the proportion of Al to AlBr₃ is 1:1, we wil need only 4 atoms of Al to produce them, which meand that, from the total 8 atoms, we will get

4 atoms of Al as excess reactant after the reaction is complete.

The element group VI A, also known as the chalcogen group, consists of the elements oxygen, sulfur, selenium, tellurium, and polonium. These elements are characterized by having six valence electrons, which is why they are placed in group VI A of the periodic table.

The period number refers to the row of elements on the periodic table. Elements in period 3 include sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, and argon.

It is not possible to determine the number of protons in the nucleus of an element based on its group and period alone. The number of protons in the nucleus of an element is equal to its atomic number, which is a unique property of each element.

Oxygen, which is the first element in group VI A, has an atomic number of 8, which means it has 8 protons in its nucleus. Sulfur, which is the second element in group VI A, has an atomic number of 16, which means it has 16 protons in its nucleus. Selenium, which is the third element in group VI A, has an atomic number of 34, which means it has 34 protons in its nucleus. Tellurium, which is the fourth element in group VI A, has an atomic number of 52, which means it has 52 protons in its nucleus. Polonium, which is the fifth element in group VI A, has an atomic number of 84, which means it has 84 protons in its nucleus.

Elements in period 3 with atomic numbers 11, 12, 13, 14, 15, 16, 17, and 18 are sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, and argon, respectively. These elements have 11, 12, 13, 14, 15, 16, 17, and 18 protons in their nuclei, respectively.

Nine lattice points make up this unit cell, eight of which are corner atoms (creating the cube) and one of which is in the cube's centre. For a total of two net atoms, the centre atom and the edges each contribute one net atom.

An atom, ion, or molecule that is present in the crystal at a certain lattice position is referred to as a unit cell corner. The simplest repeating unit in a cubic structure centred on the body is the cubic unit cell.

With two lattice points per cell, the bcc lattice can be compared to a unit cubic cell. There are eight neighbours closest to each lattice point. It is also possible to say that the coordination number is 8. Yet, it is also simple to derive the base cell of a bcc lattice.

Nine lattice points make up this unit cell, eight of which are corner atoms (creating the cube) and one of which is in the cube's centre.

The corners contribute only one net atom and the center atom contributes another for a total of two net atoms.

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Answer:

...are in constant motion

Explanation:

Matter is made up of particles that are constantly moving. All particles have energy, but the energy varies depending on the temperature the sample of matter is in and also the state of matter as well.

The given molecule C_12 H_22 O_11 is sucrose.

Sucrose of not dissociable in water hence Vant Hoff factor is 1

i.e

\(\boxed{\sf T_f=kmi}\)

For Sucrose

\(\\ \sf\longmapsto T_f=1(0.3)k=0.3k\)

Now.

Let's check Vant Hoff factor of each compound.

Let's count Freezing point of each compound.

m=0.075

\(\\ \sf\longmapsto T_f=0.075(4)k=0.3k\)

m=0.15

\(\\ \sf\longmapsto T_f=0.15(3)k=0.75k\)

m=0.3

\(\\ \sf\longmapsto T_f=0.3(2)k=0.6k\)

m=0.6

\(\\ \sf\longmapsto T_f=0.6k\)

Hence option A is correct

Answer:

The basis of the separation by steam distillation is that while the water and organic condensed phases are immiscible, the vapors of both are miscible. Once condensed, the two separate again allowing for an easy separation. As noted above, both liquids and solids can be distilled by steam.

Explanation:

I hope this helps!

Answer:

Because.in theory, it's impossible for philosophers (Greeks) don't have the proper equipment and also they don't have enough facts to back it up

Explanation:

Hope this helps

The theory that explains how glacial material can be observed today near sea level at the equator, even though sea level glaciers probably never existed there, is called glacial erratics.

Glacial erratics are large rocks that have been transported from their place of origin by glaciers and deposited far away. During the Pleistocene era, glaciers covered much of the earth, including areas near the equator. As these glaciers retreated, they left behind glacial erratics that can still be observed today. These rocks provide evidence of the extent of past glaciation and help scientists understand the history of the earth's climate.
The theory that explains the presence of glacial material near sea level at the equator is Plate Tectonics. This theory describes Earth's crust as being composed of large, moving plates that interact with one another. Over millions of years, these plates have shifted continents, leading to the distribution of glacial material in various locations, including equatorial regions. Glaciers likely formed at higher latitudes and altitudes during past ice ages, and as the plates moved, the glacial deposits were carried along, eventually reaching their current positions near sea level at the equator. This process demonstrates the dynamic nature of Earth's surface and its geological history.

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In the hydroboration-oxidation reaction, the nucleophile is borane (BH3), and the reaction is regioselective due to the preference for adding to the less substituted carbon atom of the alkene.

In the given experiment, the nucleophile is the compound or species that donates a pair of electrons to form a new covalent bond with another atom or molecule.

In the context of hydroboration-oxidation, the nucleophile is the boron atom (B) in the reagent BH3 (borane). BH3 acts as a Lewis acid and forms a coordinate covalent bond with the nucleophile, which is typically an alkene.

The reaction is considered regioselective because it exhibits selectivity in the formation of a specific regioisomer. In hydroboration-oxidation reactions, the regioselectivity arises from the nature of the reaction mechanism.

During hydroboration, the boron atom adds to the alkene's least substituted carbon atom, resulting in the formation of an organoborane compound. Subsequent oxidation converts the organoborane to an alcohol.

The regioselectivity is primarily attributed to the preference of the boron atom to add to the carbon atom with fewer alkyl groups attached. This preference is due to the electronic and steric factors involved in the reaction mechanism.

The boron atom acts as an electron-deficient species and is attracted to the electron-rich double bond. However, the steric hindrance caused by the alkyl groups around the double bond influences the selectivity, favoring the addition to the less hindered carbon atom.

Overall, the regioselectivity of the hydroboration-oxidation reaction ensures the formation of the desired regioisomer by selectively adding the boron atom to the less substituted carbon atom of the alkene, leading to the synthesis of the target compound.

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Aid is money given to students for education funding which may not be paid back.

The term aid may be used to refer to money given to a person for a particular purpose which the person may not be required to pay back. Often students are given this sort of assitance to fund their education.

Hence, grants given to students to finance their education which they may not pay back are called aid.

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Answer:

C4H6O4

Explanation:

First, the empirical formula needs to be calculated as follows

- Divide each element mass by its molar mass to convert to moles

C = 40.68/12 = 3.39moles

H = 5.08/1 = 5.08moles

O = 54.24/16 = 3.39moles

Next, we divide each mole value by the smallest (3.39moles)

C = 3.39/3.39 = 1

H = 5.08/3.39 = 1.5

O = 3.39/3.39 = 1

To get the empirical formula of this molecule, we multiply all by 2 to have:

C = 2

H = 3

O = 2

The empirical formula of C,H,O = 2:3:2

That is, C2H3O2

Next, we find the molecular formula as follows:

(C2H3O2)n = 118.1

{12(2) + 1(3) + 16(2)}n = 118.1

24 + 3 + 32 = 118.1

59n = 118.1

n = 118.1/59

n = 2.001

Therefore, the molecular formula is:

(C2H3O2)2

= C4H6O4

2.87 kg will be equal to 2870 grams, when converted using the metric system.

The metric system is a decimalized system of measurement used in many parts of the world. It is based on a decimal system, where the base unit of measurement is the gram. The metric system is the most common system of measurement used in the world today and is used in many scientific and medical applications.

It is based on the decimal system, where units of measurement are based off of a single base unit. It is also easy to convert from one unit of measurement to another, as the conversions are based on multiples of ten. This makes it easier to use and understand and is beneficial in many applications.

In order to convert 2.87 kg to grams, the following steps can be taken:

1. Multiply 2.87 kg by 1000, as there are 1000 grams in 1 kg.

2. 2.87 kg x 1000 = 2870 g

Therefore, 2.87 kg is equal to 2870 grams when using the metric system.

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Answer: good                  

Explanation:  its fun

The water is transferring its energy to the brass, which causes it to heat up.

Convection, conduction, radiation, advection, and chemical reaction are all mechanisms for transferring energy from one object to another. This is due to the fact that heat always flows from a hotter object to a colder object until both reach the same temperature.

Because the water is hotter than the brass in this case, heat energy flows from the water to the brass until they reach thermal equilibrium. As a result, the brass has the opposite effect of increasing the temperature of the water.

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