Once started, why can nuclear fission continue to occur on its own? The thermal energy released can cause the products to join. The neutron formed by the reaction can cause more nuclei to combine. The thermal energy released can cause the products to split. A neutron begins the reaction, and more neutrons are formed in it.

The element X  in the ionic compound from the question belongs to group 2.

An ionic compound is a compound that is formed when there is a combination of two or more atoms that are combined by the transfer of electrons. Now we know that the transfer of the electrons would give rise to the formation of to ions, a cation and an anion. The cation is the specie that lost electrons while the anion is the specie that gained the electrons. Thus the compound is composed actually of an ions pair that are necessarily of opposite charges from each other.

In this case, an ionic compound has the formula[tex]X_{3} N_{2}[/tex]. We can see that the element X has reacted with nitrogen to form a nitride and that the nitrogen has a subscript of 2 as shown.

The fact the nitrogen has a subscript of 2 shows that the element belongs to group 2.

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The unknown elements based on their physical properties are as follows:

Element 1 is Krypton

Element 2 is Strontium

Element 3 is Lead

Element 4 is Bromine

Element 6 is Francium

Some of the physical properties of elements used to identify the elements include:

Considering the properties of the given elements from the periodic table:

Element 1 = Krypton

Element 2 = Strontium

Element 3 = Lead

Element 4 = Bromine

Element 5 = Copper

Element 6 = Francium

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The unit of the density of the substance from cg/L to mg/mL is 7.4 x 10²⁶ mg/mL.

Unit conversion is a method or a way of converting a given quantity from one unit to another.

The density of a substance can be measured in different units as shown blow;

The density of the substance can be converted to the required unit as shown below.

7.4 x 10²⁸ cg/L to mg/ml

= (7.4 x 10²⁸ cg/L) x (10 mg/cg) x (1 L / 1000 mL)

= 7.4 x 10²⁶ mg/mL

Thus, the unit of the density can be converted from centigram per liter to milligram per milliliter.

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The What is the molarity of MgCl₂ in the original sample is 1.63 mol/L

[tex]Molarity = \frac{Mass\ of\ MgCl_2}{molar \ mass\ of MgCl_2} \times\frac{1}{volume \of \ the\ solution \ in\ litres}[/tex]

[tex]Molarity = \frac{156g}{95.211g/mol} \times\frac{1}{1L}\\\\Molarity = 1.63 \ mol/L[/tex]

Molarity (M) is the amount of a substance in a certain volume of solution. Molar concentration is a measure of the concentration of  chemical compounds, especially a solute in a solution, as the amount of the substance per unit volume of the solution. In chemistry, the most commonly used unit of molarity is the number of moles per litter, indicated in the SI unit  mol/L or mol/dm³.

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Explanation

Given

N2(g)+3H2(g)—> 2NH3(g)

Number of moles of nitrogen = 1.5 moles

Number of moles of hydrogen = 6 moles

Required: Limiting reagent

Solution

For Nitrogen:

For Hydrogen:

The limiting reagent is Nitrogen, because less moles of NH3 will be produced by nitrogen, meaning it all of it gets used up.

Answer

The limiting reagent is Nitrogen.

Taking into account the definition of dilution, after two dilutions the final concentration is 0.1923 M.

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution. This is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know for the first dilution:

Replacing in the definition of dilution:

1.50 M× 68 mL= Cf× 208 mL

Solving:

(1.50 M× 68 mL)÷ 208 mL= Cf

0.49 M= Cf

Now, in a second dilution you take a sample of 104 mL of this diluted solution and add another 161 mL of water. The final volume of the solution will be

Vfinal= 104 mL + 161 mL= 265 mL

The concentration of the 104 mL sample is equal to the concentration of the first diluted solution, this is 0.49 M. Therefore, the concentration of the final solution will be:

0.49 M× 104 mL= Cf× 265 mL

Solving:

(0.49 M× 104 mL)÷ 265 mL= Cf

0.1923 M= Cf

In summary, the final concentration is 0.1923 M.

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Answer: 8.604 x1022 atoms

Explanation:

We can say that Javier is right because the reactivity of the elements tends to decrease from left to right.

The periodic table is an arrangement of the elements in order of increasing atomic number. Let us note that the modern periodic law states that the properties of the elements is a periodic function of their  atomic numbers .Thus the atomic numbers of the elements tends to increase from left to right in the periodic table as we can see in the image that have been attached to the question above.

Now, we know that the reactivity of the elements also tend to decrease from left to right. This is because, the heavier the element, the less reactive that the element is. Recall that every period that we can find in the periodic table tends to end up with a non reactive noble gas element.

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A small sample of chloride salts of group I metals on stirring with water on a beaker, at least some of the solid added will cease to be visible at the bottom of each beaker.

Group I elements are Hydrogen, Lithium, Sodium, Potassium, Rubidium, Cesium and Francium.

When chloride salts of these elements where dissolved in water it would not produce bubbles or change colour.

In addition to that, not all salts would feel hot to touch when the beaker in which the salt was dissolved is touched. Some would feel cool. This is because of difference in the process happening between the salt and water. For example: HCl would release heat when dissolved in water – Exothermic reaction (Beaker would be hot to touch) whereas KCl would absorb heat  when dissolved in water – Endothermic reaction (Beaker would be cool to touch).

One common thing about chloride salts of group I elements is that they all dissolve in water. The bond between the elements and the chloride is Ionic in nature. In the water, the bond between the molecules is covalent. The covalent bonds are stronger than ionic bonds. Thus, ionic bonds dissociate and covalent bonds would be formed with water and dissociated ions i.e., chloride salts are dissolved in water. When this happens, solid would cease to be visible at the bottom of each beaker.

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Newton's laws of motion the answers to these is an object will not change its motion unless a force acts on it

In the first law an object will not change its motion unless a force acts on it and in the second law, the force on an object is equal to its mass times its acceleration and in the third law when two objects interact they apply forces to each other of equal magnitude and opposite direction and newton's second law is a quantitative description of the changes that a force can produce on the motion of a body and it states that the time rate of change of the momentum of a body is equal in both magnitude and direction to the force imposed on it

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Calculation also includes applying logic to a non-numerical issue. Exponentiation comes first, followed by multiplication and division, and then addition and subtraction, as is the case for each mathematical equation.

A computation is a methodical, well-thought-out process. Calculating the solution to a math problem is the first type of calculation, for which you might use a calculator. Calculation also includes applying logic to a non-numerical issue.

Exponentiation comes first, followed by multiplication and division, and then addition and subtraction, as is the case for each mathematical equation.

1 km = 1000 m; 1 hr = 3600 sec.

[1 km/hr = 1000/3600 m/sec = 5/18 m/sec

To convert km/hr into m/sec, multiply the number by 5 and then divide it by 18.]

83km.h-1  = 83 × 5/18 = 23.05

= 23 m.s-1

83 km.h-1 + 83 m.s-1   = 23 m.s-1 + 83 m.s-1

= 106 m.s-1

Therefore, the correct answer is 106 m.s-1.

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The following factors can affect the solubility of a substance is temperature and pressure

Solubility is the maximum amount of substances that will dissolve in a given amount of solvent at specific temperature and solubility is the characteristics property of specific solute and solvent combination and different substances has greatly different solubility's and there are two direct factor that affect the solubility and they are temperature and pressure and temperature affect solubility of both solid and gases but pressure only affect the solubility of gases

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Answer:

0.43 M

Explanation:

The equation that should be used in this case would be:
pOH = pKb + log([A+]/[Base])
pKb = -log (4.6*10^-4) = 3.34
pOH = 14-10.2 = 3.8
[Base] = 0.15
3.8 = 3.34 + log x/0.15
0.46=log x/0.15
10^(0.46) = x/.15
x = 10^(0.46)  * 0.15 = 0.43 M

When cirrus clouds are above a deck of altocumulus clouds, occasionally a clear area, or “hole” will appear in the altocumulus cloud layer which is caused by supercooled water in the clouds suddenly evaporating.

This is referred to as a mass of condensed watery vapor which are floating in the atmosphere and results in precipitation due to continued condensation in the form of rain, snow etc.

There are different types of clouds and in a scenario where a clear area, or “hole” will appear in the altocumulus cloud layer then it is as a result of the supercooled water in the clouds suddenly evaporating and creating the space seen or observed.

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Answer:

6186.98

Explanation:

105.4 mol of nickel is 6186.98 nickel

The maximum amount of ethane (C₂H₆) that can be formed is 9.15 g.

The formula for the the limiting reagent is H₂

The amount of excess reagent that remains after the reaction is 3.86 g.

The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops.

The limiting reagent is determined by balancing the chemical equation as follows;

H₂ + C₂H₄  --------> C₂H₆

From the reaction above;

1 mole of hydrogen gas = 1 mole of ethylene = 1 mole of ethane

2 g of hydrogen gas (H₂)  = 30 g of ethane (C₂H₆)

0.61 g of H₂ = ? of C₂H₆

= (0.61 x 30)/2

= 9.15 g of C₂H₆

Thus, the maximum amount of ethane (C₂H₆) that can be formed is 9.15 g.

The formula for the the limiting reagent is H₂ because it will be completely used up.

2 g of H₂ = 28 g of C₂H₄  -

0.61  of H₂ = ?

= (0.61 x 28)/2

= 8.54 g

Excess mass of the ethylene that remains = 12.4 g - 8.54 g = 3.86 g

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The new pressure when the can is heated to 1235 °C is 4031.8 torr

we'llbegin by listing out the parameters obtained from the question. This is given below:

The new pressure can be obtained as illustrated below:

P₁V₁ / T₁ = P₂V₂ / T₂

Volume = contant

P₁ / T₁ = P₂ / T₂

770 / 288 = P₂ / 1508

Cross multiply

P₂ × 288 = 770 × 1508

P₂ × 288 = 1161160

Divide both sides by 288

P₂ = 1161160 / 288

P₂ = 4031.8 torr

Thus, the pressure of the can is 4031.8 torr

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Atomic Structure - Dalton's Atomic Theory

From Dalton's experiments and observations, and from the work of some of his colleagues he proposed a new theory of the atom.

Answer:

For answering we will have to create a 5x3 table. It will have the following headings:

The information that has to go in the table is:

Dalton's Postulates

1.1:All matter is composed of extremely small particles called atoms.

2.1: Atoms of a given element are identical in size, mass, and other properties. Atoms of different elements differ in size, mass and other properties.

3.1: Atoms cannot be subdivided, created or distroyed.

4.1 Atoms of different elements can combine in simple whole number ratios to form chemical compounds.

5.1: In chemical reactions, atoms are combined, separated or rearranged.

Keep/Modify/Discard:

1.2:Keep

2.2:Modify

3.2:Modify

4.2:Keep

5.2:Keep

Rewrite in case of need:

1.3: No need

2.3: Atoms of different elements differ in size, mass and other properties. Atoms of a given element can also differ in mass.

3.3: Atoms can be further subdivided, and using nuclearfission and fussion techniques atoms can be created or destroyed by changing them into other atoms.

4.3:No need

5.3: No need

Answer:

H2O

Explanation:

H2O should deviate from ideal behavior the most. Remember that an ideal gas has molecules which don't interact. Argon exists as an monoatomic element in the gas state, and the atom is neutral throughout. This means that two argon atoms only interact with each other through London dispersion forces or bumping. However, water is polar, so water molecules will attract each other strongly through permanent dipole-dipole interactions and hydrogen bonding. This means that water vapor deviates from ideal behavior the most

The density of a substance is calculated by taking the ratio of its mass and volume. The density of the diaphysis sample with a mass of 41 g is 0.725 g/cm³.

Density is measure of mass of a substance per unit volume. Thus, mathematically it is mass divided by volume. Density of a substance is dependant on molecular weight, volume, temperature and bond type also.

Density of a substance may change with temperature. For example, the density if water is 1 g/L but it changes to maximum 4° C. A diaphysis sample is cylindrical in shape and have a volume of πr²l  where r is the radius and l be the length.

The volume of the diaphysis with a length of 8 cm and radius of 1.5 cm is calculated as follows:

Volume = πr²l

             = 3.14 × (1.5 cm)² × 8 cm

             = 56.52 cm³.

The density of the sample can be calculated by dividing the mass by volume as follows:

Density = mass / volume

             = 41 g/ 56.52 cm³

             = 0.725 g/cm³

Therefore, the density of the diaphysis sample is 0.725 g/cm³.

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Based on the diagram of the carbon cycle given:

The carbon cycle is a cycle that describes the processes by which carbon is recycled between the various living and non-living components of the earth.

Carbon is an essential element required by all living organisms for their growth and development.

Also, carbon is found as part of the component of the non-living environment.

There, it is important that carbon is cycled between the various spheres of the earth.

Carbon is cycled between the biosphere (plants), the lithosphere (ground), the atmosphere (air), and the hydrosphere (water).

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Answer:

7 sublevels (i think)

Explanation:

i will assume n is the principle quantum number, so the sublevels is l.
l can equal 0, 1, 2... all the way up to n-1, in this case, 7-1, or 6
This means the sublevels are:
0,1,2,3,4,5,6, for a total of 7 sublevels

Answer:

Explanation:

Many materials can be used in making textiles. The materials are mainly from animal, plant, mineral and synthetic sources. The examples are as follows;

Answer:

A. True

Explanation:

Moles of potassium nitrate are produced at the same time 4.4 moles of aluminum phosphate are produced is 28.63 mole

Potassium nitrate is an inorganic salt with a chemical formula of KNO₃ it is a natural source of nitrate and has been used as a constituent for several different purposes including food preservatives, fertilizers, tree stump removal, rocket propellants, and fireworks

Here given data is

4.4 moles of aluminum phosphate

We have to find  moles of potassium nitrate =?

Number of mole = mass of substances/mass of one mole

Number of mole = 126/ 4.4 moles

Number of mole = 28.63mole

So, 28.63 mole potassium nitrate are produced at the same time 4.4 moles of aluminum phosphate are produced

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The statement about sub-atomic particles that is true is:

Sub-atomic particles refer to the smaller particles that are the constituents of atoms of elements.

There are three sub-atomic particles within a given atom,

The three sub-atomic particles are given below:

Considering the given statements about the sub-atomic particles, the only true statement is that which describes the mass of the electron as being the smallest of the three sub-atomic particles.

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Complete question:

Which statement about subatomic particles is true?

Protons are the only subatomic particles to have a charge.

Electrons are the subatomic particles with the smallest mass.

Neutrons orbit the nucleus of the atom.

Subatomic particles all have the same mass

The relative atomic mass of the interactium, give the data is 287.92 amu

The relative atomic mass of the interactium can be obtained as illustrated below:

Relative atomic mass = [(Mass of A × A%) / 100] + [(Mass of B × B%) / 100] + [(Mass of C × C%) / 100] +

Relative atomic mass = [(283 × 22) / 100] + [(286 × 35) / 100] + [(292 × 43) / 100]

Relative atomic mass = 62.26 + 100.1 + 125.56

Relative atomic mass = 287.92 amu

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Considering the definition of molal concentration, the molal concentration of glucose is 0.004166  moles/kg.

Molality or molar concentration is a way of measuring the concentration of solute in solvent, that is, the number of moles of solute present in the solvent.

Molality is defined as the moles of a solute per kilogram of solvent.

The Molality of a solution is determined by the expression:

molality= number of moles of solute÷ kilogram of solvent

In this case, you know:

Replacing in the definition of molal concentration:

molality= 0.0004166 moles÷ 0.1 kg

molality= 0.004166  moles/kg

Finally, the molal concentration in this case is 0.004166  moles/kg.

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