In a fission reaction, uranium-235 bombarded with a neutron produces
strontium-94, another small nucleus, and three neutrons.

Enter the complete equation for the fission reaction.
Express your answer as a nuclear equation.

The alkali metals hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (F) are found in Group 1A of the periodic table (Fr).

Because of the orderly arrangement of the elements, it is known as the periodic table. They're arranged in rows and columns, as you'll see. The vertical columns that go from top to bottom and the horizontal rows that travel from left to right are referred to as Periods and Groups, respectively.

All known elements are grouped together in the periodic table of elements into groups with related properties. As a result, it becomes a vital tool for chemists, nanotechnologists, and other researchers. If you can utilize and understand the periodic table, you can predict how compounds will react.

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1) The Molarity of first solution is 0.163 M

2) The molarity of second solution is 0.344 M

1) Molarity is defined as the no. of moles of solute per liter solution.

First solution contains 0.450 mol of NaOH in 2.75 L of solution.

M = n / V

where , n= no, of moles of solute

V  = volume of solution in liter

no. of moles of solute = 0.450 mol

M =  0.450 / 2.75 = 0.163 M

Molarity = 0.163 M

2) Th second solution contains 15.1 g of NaCl in 749 ml of solution.

moles = mass / molar mass

          =  15.1 g / 58.44 g/mol

          =  0.258 mols

volume = 749 ml = 0.749 L

M =  0.258 / 0.749

    = 0.344 M

Molarity = 0.344M

Thus, 1) The Molarity of first solution is 0.163 M

2) The molarity of second solution is 0.344 M

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Answer:

isotopes of elements with unstable nucleus releases nuclear radiation. generally the instability is related to the neutron to proton ratio in the nucleus of an atom

Answer:

The nucleus is a double-membraned organelle that contains the genetic material and other instructions required for cellular processes. It is exclusively found in eukaryotic cells and is also one of the largest organelles.

Diamond yields the largest mass of carbon monoxide.

The term combustion has to do with the burning of a substance in oxygen. Now we know that when we burn a substance in oxygen, the substance is oxidized.

The burning of a hydrocarbon in air gives carbon dioxide and water. We could sometimes obtain a low concentration of carbon monoxide when the combustion is carried out in a poor supply of air.

However, when we burn diamond in air which largely consists of carbon, we can see that the product of the reaction is carbon monoxide.

Thus diamond yields the largest mass of carbon monoxide.

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There are 27 atoms in total in Cr₂(S₂O₃)5.

Atoms are the smallest possible amount of matter which still retains its identity as a chemical element and now known to consist of a nucleus surrounded by electrons.

Atoms are contained in elements. This means there are atoms in hydrogen, oxygen, chlorine etc.

According to this question, a compound with the chemical formula Cr₂(S₂O₃)5 is given. The number of atoms in this compound can be calculated as follows:

In this compound, there are;

This means that in total, 27 atoms are present in Cr₂(S₂O₃)5.

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Answer:

long pants

Explanation:

everything else is hazardous, and the long pants will protect your legs.

Answer:

Explanation:

The atomic weight of iron (Fe) is 55.845 u. Since it's impossible to count the amount of atoms in a given mass of a substance, we measure atoms in moles. No matter what the element or compound is, there will be [tex]6.022 * 10^{23}[/tex] atoms in one mole of compound. This is called Avogadro's number. Atomic weight, also called molar mass, is measured in grams per mole. We first find the number of moles of iron in 3.47 grams by setting up an inequality: [tex]\frac{55.845 g}{1 mol} = \frac{3.47 g}{x mol}[/tex]. Solving this inequality shows that there are 0.06213627 moles of iron in 3.47 grams. Now, all we do is multiply that value by Avogadro's number, [tex]6.022*10^{23}[/tex]. This gives us 3.7418 * 10^22 atoms in 3.47 grams of iron.

Karen drove 0.3 hours to the east at constant velocity for 30 km. The velocity of Karen when she drove towards east is 100 km/ h.

Velocity is defined as a direction of movement of the body or the object.

It is a vector quantity. It is the rate of change of distance and rate of change of displacement.

It is a fundamental concept in kinematic, the branch of classical mechanics that describes the motion of body.

Velocity can be expressed as

Velocity = distance / time

              = 30km / 0.3 h

              = 100 km/h

Thus, the velocity of Karen when she drove towards east is 100 km/ h.

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The mass of the liquid gold is 25 grams because the same number of atoms will be present in the liquid and the solid.

The smallest component of ordinary matter that makes up a chemical element is an atom. Atoms that are neutral or ionised make up every solid, liquid, gas, and form of plasma. Atoms are incredibly tiny, usually measuring 100 picometers across.

The smallest piece of matter that can be divided without sending electrically charged particles flying. It is also the smallest piece of matter with chemical element-like characteristics. As a result, the atom serves as the fundamental unit of chemistry.

According to the given value;

The density will decrease from 19.30 g/cm3 (solid gold room temp) to 17.31 g/cm3 (at melting point). And volume will increase because the atoms will be loosely connected.

The mass of the liquid gold is 25 grams because the same number of atoms will be present in the liquid and the solid.

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The solubility of the given solutes in the solvents are as follows:

The solubility of a substance in a solvent is the amount of that substance that dissolves in a given volume of the solvent.

The substance that is dissolved in a solvent is known as the solute.

The solubility of  a solute in a solvent depends on both the nature of the solute as well as the solvent.

For example, polar substances dissolve in polar solutes but not i non-polar solvents, whereas, non-polar solutes dissolves in non-polar solvents but not in polar solvents. This is known as the principle of like dissolves like.

Considering the given solutes and the solvents to determine the solubility of the solutes in the given solvents:

Water:

Salt and Sugar dissolves in water but Flour does not dissolve in water.

Hydrogen peroxide:

Salt and Sugar dissolves in hydrogen peroxide but Flour does not dissolve in hydrogen peroxide.

Isopropyl alcohol:

Sugar dissolves in isopropyl alcohol but Salt and Flour does not dissolve in isopropyl alcohol.

Mineral oil:

Flour dissolves in mineral oil but Salt and Sugar does not dissolve in mineral oil.

Vinegar:

Sugar dissolves in vinegar but Salt and  Flour does not dissolve in vinegar.

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D. The option that is formed by the process of fusion in stars is elements.

When the new star reaches a certain size, a process called nuclear fusion ignites, generating the star's vast energy.

The fusion process forces hydrogen atoms together, transforming them into heavier elements such as;

Thus, the option that is formed by the process of fusion in stars is elements.

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The balanced equation reveals a 3:2 molar ratio between O2 and KCl. Therefore,

(32.0 g O2 g/1 mol O2) (3 mol O2/2 mol KCl) (1 mol KCl/74.5 g KCl) (40.6 g KCl) = 26.2 g O2

When heated over 400 °C or in touch with strong acids, it decomposes, emitting poisonous gases such chlorine dioxide and chlorine fumes as well as oxygen. It breaks down into oxygen and perchlorate above the melting point.

Potassium chlorate (KClO3) breaks down into potassium chloride and oxygen gas when heated in the presence of a manganese dioxide catalyst.

The response provided in the query is a decomposition response. A decomposition reaction is one in which a chemical component is broken down into two or more new compounds by the action of heat, light, or electrical energy. Here, potassium chlorate breaks down to produce oxygen gas and potassium chloride.

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alin sa sumusunod ang nagpapahayag ng tunay na pagmamahal batay sa mitong psyche at cupid

Answer:  -1.67 KJ

Explanation:

Given- m of water= 21g

           Final temperature- 67°C

           Initial temperature- 86°C

           Specific heat capacity of water ( c)= 4.182 J/g°C

Solution

Q= mcΔT

Q= 21g* 4.182J/g°C*(67°C-86°C) = -1669J

The molecular formula is [tex]C_{7} H_{21} F_{7}[/tex].

There are several formulas that a compound could have. The empirical formula is the simplest formula of the compound. It is the formula that shows the ratio of the atoms of each of the elements present. The molecular formula shows the number of atoms of each element that is present in the compound. The structural formula is the formula that shows the arrangement of the atoms in the molecule.

Now we want to obtain the empirical formula using the following procedure;

Mass of carbon = 0.1935 g

Number of moles of carbon = = 0.1935 g/ 12 g/mol = 0.016 mole

Mass of hydrogen = 0.0325 g/1 g/mol = 0.0325 moles

Mass of fluorine =  0.2043 g/19 g/mol = 0.011 moles

We now have to divide through by the lowest number of moles to obtain the empirical formula;

C - 0.016 mole/0.011 moles   H - 0.0325 moles/0.011 moles F- 0.011 moles /0.011 moles

C – 1  H – 3 F – 1

The empirical formula is [tex]CH_{3} F[/tex]

Molar mass of the empirical formula = 12 + 3 + 19 = 34 g/mol

Molecular formula = 34n = 240.23

n = 240.23/34

n = 7

The molecular formula is [tex]C_{7} H_{21} F_{7}[/tex].

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You wish to prepare 189 grams of 5.70 % solution. You will need 10.773 grams of sodium acetate and 178.23  mL of water.

A solution is a homogenous mixture of a solute and a solvent. When two substance mixes perfectly together make a solution.

Given, that the density of water is 1.00 g/mL.

Preparation of 189 grams of 5.70 % solution.

Mass of CH₃COONa

189 x  5.70 / 100 = 10.773 grams

Mass of water = mass of solution – mass of solute

189 - 10.77 = 178.23 grams

Volume = mass / density

178.23 / 1.00 = 178.23  ml

Thus, the mass of sodium acetate is 10.773 grams, and the volume of water is 178.23  ml.

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The statement describes the advantage of this model of the solar system is  that The students can infer information about the effects of gravity on each planet. Option D

The solar system is composed of the sun and the planets. It has to do with a set up in which the sun lies at the center. We call this the heliocentric model of the solar system.

Given that we have taken the school to be the sun which lies at the center of the solar system and the position of the planets have been scaled using 1 AU = 100 meters (the length of a football field).

The only thing that is given in the options that we can not infer from this set up is the fact that; the students can infer information about the effects of gravity on each planet.

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The Confidence interval i.e, CI is calculated by the formula

CI= x±  zs/ √N

where,

z= Confidence level value

s= standard deviation

N= Total number of measurements taken

So, we know that,

For 95% confidence level,

z=1.96

For 96% confidence level ,

z= 2.58

We know that,

s= 0.27 mgCu/mL

x= 7.91 mg Cu/ mL

A)

99%CI = 7.91± 2.58×0.27/√1

= 7.91± 0.70 mgCu/mL

95% CI=  7.91± 1.96×0.27/ √1

= 7.91± 0.53mgCu/mL

B)

99%CI = 7.91± 2.58×0.27/√4

= 7.91± 0.35 mgCu/mL

95% CI=  7.91± 1.96×0.27/ √4

= 7.91± 0.26mgCu/mL

C)

99%CI = 7.91± 2.58×0.27/√16

= 7.91± 0.17 mgCu/mL

95% CI=  7.91± 1.96×0.27/ √16

= 7.91± 0.13 mgCu/mL

The  99% and 95% confidence level interval for single analysis can be calculated, and also for the mean of 4 and 16 analysis by changing the value of N.

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A fundamental characteristic of an object, its inertia is quantified by its mass, which is a basic indicator of the volume of substance inside the thing.

What does the word "mass" mean?

In science, mass is a method for measuring inertia, a fundamental property of all matter. In essence, it's the resistance of a mass of matter to changing its direction or speed in reaction to the application of a force.

Why is mass important?

The celebration of the Eucharist, which is the main act of worship in the Roman Catholic Church, takes place during mass. The ecclesiastical Latin formula for the congregation's dismissal is where the word "mass" comes from.

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Answer:

the direction of a chemical equation is reversed, the arithmetic sign of its ΔH is changed (a process that is endothermic in one direction is exothermic in the opposite direction).

Explanation:

the direction of a chemical equation is reversed, the arithmetic sign of its ΔH is changed (a process that is endothermic in one direction is exothermic in the opposite direction).A positive ΔHº value represents an addition of energy from the reaction (and from the surroundings), resulting in an endothermic reaction. A negative value for ΔHº represents a removal of energy from the reaction (and into the surroundings) and so the reaction is exothermic.Every chemical reaction occurs with a concurrent change in energy.

The change in enthalpy equals heat at constant pressure.

Enthalpy changes can be expressed by using thermochemical equations.

Enthalpy changes are measured by using calorimetry.What happens to the value of ∆H for a thermochemical reaction if the reaction is reversed? A. ∆H has the same numerical value, and the sign changes.Every chemical reaction occurs with a concurrent change in energy.

The change in enthalpy equals heat at constant pressure.

Enthalpy changes can be expressed by using thermochemical equations.

Enthalpy changes are measured by using calorimetry.What happens to the value of ∆H for a thermochemical reaction if the reaction is reversed? A. ∆H has the same numerical value, and the sign changes.

Answer:

The scientist used the law of Conservation of matter.

Explanation:

This law states the matter cannot be created or destroyed. Matter can however be rearranged.

Answer: The scientist used the law of Conservation of matter.

Explanation:

This law states the matter cannot be created or destroyed. Matter can however be rearranged.

Explanation:

above

1.769 grams of Rn-226 still exist after three half-lives.

Half-life of a substance is the time required by the substance to reduce to half of the initial value.It is used to explain how fast unstable atoms undergo radioactive decay.It is a constant for a lifetime of an exponentially decaying substance.

Formula of half-life when number of days and radioactive decay are given respectively as,

N[tex]_(t)[/tex]=N₀(1/2)[tex]_t[/tex]

λ=0.693/t[tex]_1/2[/tex]

According to the question given data is,

initial amount (N₀)=6.0 g

half life (t[tex]_1/2[/tex])=3.8 days

To calculate final mass after 3 half lives,days in 3 half-lives are calculated as,number of half lives×each half life period=3×3.8=11.4 days

Number of atoms existing after 11.4 days =N₀(1/2)[tex]^11.55[/tex]=N₀/3.391=6/3.391=1.769 g

Therefore,1.769 g of Rn-226 still exist after three half-lives.

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For calculations involving data having 2 significant figures, the value that will be used for the number of joules in a calorie is 1 cal = 4.2 J.

Rounding off implies simplifying a number by preserving its value but moving it closer to the next number. It is done for whole numbers as well as decimals at various places of hundreds, tens, tenths, and so on. Numbers are rounded off to maintain important digits. The number of important figures in a result is simply the number of figures that are reliably known.

Estimation is a sort of rounding-off. Estimation is employed in daily life as well as in areas such as mathematics and physics. Many physical values, such as money, distance traveled, length measured, and so on, are approximated by rounding off the actual number to the next whole number.

If the digit in the smallest spot is less than 5, it is left alone. Rounding down occurs when any number of digits following that number reaches zero.

If the digit in the smallest position is larger than or equal to 5, it is multiplied by +1. Rounding up occurs when any digits following that number reach zero.

Therefore, by rounding off, 1 cal = 4.2 J.

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Answer:

True

Explanation:

A combustion reaction is when a substance reacts with oxygen and releases a huge amount of energy in the form of light and heat. A combustion reaction always has oxygen as one reactant.

Answer:

Carbon with two single bond and one double bond is more reactive

Mass (in g) of the excess reactant is left is 28.39 g and mass is measure of the amount of matter that an object contains

Mass of reactants is equal to the mass of products if the reaction has the same number of atoms of different elements on either side of the chemical equation respectively.

Here molar mass of P₄ = 31.0×4g/mol = 124.0g/mol

Molar mass of Cl₂ = 35.5×2g/mol = 71.0g/mol

Molar mass of PCl₃ = 31.0+35.5×3g/mol = 137.5g/mol

Initial no of moles of P₄ = 45.13g/124.0g/mol = 0.3639 mol

Initial no of moles of Cl₂ = 132.0g/71.0g/mol = 1.859 mol

Balanced equation for reaction,

P₄+6Cl₂→4PCl₃

Mole ratio P₄ : Cl₂ : PCl₃ = 1 : 6 : 4

If Cl₂ completely react P₄ needed  = 1.859 ×1/6 = 0.3098<0.3639mol

Hence, P₄ is in excess and Cl₂ is the limiting reactant

No of moles of  PCl₃ produced = 0.3098mol×4/6 = 0.2065mol

Mass of PCl₃ produced = 0.2065×137.5g/mol

= 28.39g

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If 2 moles of AlCl₃ reacts as shown in the balanced equation, 3 moles of MgCl₂ will be produced.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, aluminum chloride reacts with magnesium phosphate to produce aluminum phosphate and magnesium chloride as follows:

2AlCl3 + Mg₃P₂ → 2AlP + 3MgCl₂

Based on the above balanced reaction, 2 moles of aluminum chloride (AlCl₃) formed 3 moles of magnesium chloride (MgCl₂).

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