sr-90 may be produced from an atomic bomb explosion. the half-life of sr-90 is 28.8 years. what fraction of the sr-90 originally produced by the first atomic bomb in july 1945 still remains as of july 2033?

Answer:

Mg+HCl = MgCl+H2

Explanation:

you just have to write the correct formula of these elemernt

16 is the mass of this atom.

The Oxygen (O) has an atomic number of 8 and has a mass number of 16. Upon accepting 2 electrons it becomes O2-. The mass number is defined as the sum of the number of protons and neutrons present in the molecule. So here for O2- it contains 8 protons,8 neutrons and 10 electrons.

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The amount, in moles, of chlorine that would be present in 3 moles of [tex]MgCl_2[/tex] would be 6 moles.

[tex]MgCl_2[/tex] is made from magnesium and chlorine molecules according to the following equation:

[tex]MgCl_2 --- > Mg^{2+} + 2Cl^-[/tex]

From the above equation, 1 mole of [tex]MgCl_2[/tex] is made up of 1 mole of Mg and 2 moles of Cl.

Following this established ratio, the amount of chlorine that would be present in 3 moles of  [tex]MgCl_2[/tex] can be calculated as follows:

1 mole [tex]MgCl_2[/tex] = 2 moles of Cl

3 moles  [tex]MgCl_2[/tex] = 2 x 3/1

                           = 6 moles of Cl

In other words, 6 moles of Cl would be present in 3 moles of [tex]MgCl_2[/tex].

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Neil Bohr used the fluorescent screen and an alpha particle detector to study the structure of an atom.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

The atom as a whole is neutral and stable due to presence of oppositely charged particles.

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The velocity of Trevor, given that for 55.0 seconds, he moved 583 meters sountheast is 10.6 m/s

Velocity is simply defined as the rate of change of displacement with time. Mathemathically, it is given as:

Velocity = displacement / time

With the above formula, we can obtain the velocity of Trevor as illustrated below::

Velocity = displacement / time

Velocity = 583 meters / 55.0 seconds

Velocity = 10.6 m/s

Thus, from the calculation made above, we can conclude that the velocity of Trevor is 10.6 m/s

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The experimental set up in B is to observe the growth the green beans without the addition of fertilizer. Thus, we can compare the growth of the plant with and without fertilizer and thereby we can understand the effect the fertilizer on the plant growth.

Fertilizers are chemical substances used to nourish the plants by making the soil rich in nutrients and minerals. Plants needs minerals along with water such as potassium, calcium, phosphorous, nitrogen etc.

Sometimes the soil comes deficient of these minerals and we have to fertilize the soli by the addition of the chemicals containing these minerals. Hence, fertilizers provide a nutrient rich soil for plant growth.

The experimental set up with fertilizer added plant and the second one (B) without fertilizer helps to compare the growth in both conditions and we can clearly understand how fertilizers effect the growth of plants by comparing the plant growth in A and B.

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Answer:

Magnesium sulfide

Explanation:

In order to precipitate the calcium ions as calcium oxalate, a 2.00g sample of limestone was first dissolved in hydrochloric acid until all of the calcium was transformed to Ca²⁺ (aq). This was followed by the addition of excess ammonium oxalate solution, (NH₄)₂C₂O₄(aq). Filtered, dried, and weighed to a consistent mass of 2.43g. The percentage by mass of calcium in the limestone sample is 31.25%

The percentage by mass of calcium in the limestone can be calculate as follows:

Mass of precipitate that is calcium oxalate = 2.43 g

Moles of calcium oxalate = 2.00g /128 g/mol = 0.015625 moles

One mole of calcium atoms make up one mole of calcium oxalate.

so, 0.015625 moles calcium oxalate equal to 0.015625 moles calcium atoms

Mass of  0.015625 moles of calcium :

0.015625 mol × 40 g/mol = 0.625 g

Mass of sample of limestone = 2 g

Percentage of calcium in limestone:

(0.625 g/2 g) x 100 = 31.25%

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an ideal gas is brought through an isothermal compression process. If 1842 J is released by the gas during this process, the temperature of the gas is 134.27 K

Isothermal compression is the thermodynamic method of decreasing volume or increasing pressure when the system temperature remains constant. Thermal equilibrium is maintained throughout the process.

When a gas is compressed isothermally, work is carried out on the system to reduce volume and increase pressure. Working on the gas increases its internal energy and tends to raise its temperature. To keep the temperature constant, energy must escape the system as heat and enter the environment.

According to the question, this is the case of isothermal reversible compression of gas.

As per the first law of thermodynamics,

where,

ΔU = internal energy

q = heat

w = work done

As we know, the term internal energy depends on the temperature and the process is isothermal which means at a constant temperature.

Thus, at a constant temperature, the internal energy is equal to zero.

q = -w

Thus, w = -q = 1842 J

The expression used for work done will be,

W = nRT ln(Vf/Vi)

where,

w = work done = - 1842 J

n = number of moles of gas  = 5 mole

R = gas constant = 8.314 J/mole K

T = temperature of gas  = ?

Vi = initial volume of gas

Vf = final volume of gas

Now put all the given values in the above formula, and we get the temperature of the gas.

- 1842J = 5 mole * 8.314J/mole K*T*ln (104.3 * 10−6 m3/224.2  * 10−6 m3)

T = 134.27

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Colligative qualities include boiling point elevation, freezing point depression, and vapor pressure reduction. Color and density are non-colligative qualities.

Colligative qualities are those that rely on the number of particles of solute rather than the composition of the solute.

An example of a colligative property:

Reduced vapor pressure

Boiling point at an elevation

a drop in the freezing point

The osmotic pressure

Non-colligative qualities are those that are determined by the nature of the solute and solvent.

Non-colligative qualities include:

Viscosity

The surface tension

Density

Solubility

As a result, we may deduce that boiling point elevation, freezing point depression, and vapor pressure reduction are all colligative qualities. Color and density are also non-colligative qualities.

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Air pressure is D.low at the top hight at the bottom.

Pressure is the force that the air applies to the ground when gravity acts on it. At sea level, there is typically a pressure of 1013.25 millibars, or 14.7 pounds per square inch.

High pressure frequently heralds sunny, dry weather. Clouds and precipitation are frequently indicative of low pressure. Air that is sinking is related with high pressure. Because it is pushing DOWN on the ground, air pressure is higher.

High barometric pressure exerts additional pressure against our bodies, which restricts how much tissue can expand. On the other hand, when air pressure is low, our body's tissues can expand more, which results in more pressure.

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The molecules of ammonia in your reaction. the grams of ammonia will you make is 2.39 g.

given that :

the no. of molecules of the ammonia : 8.41 × 10²⁴

molar mass of ammonia : 17 g /mol

no. of molecules = (mass / molar mass ) × Avogadro's number

8.41 × 10²⁴ = (mass / 17 ) × 6.022 × 10²³

mass = 17 / 7.1

mass = 2.39 g

Thus,  a reaction which will make ammonia as a product. you predict that you should make 8.41 × 10²⁴ molecules of ammonia in your reaction.  grams of ammonia will you make is 2.39 g.

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Answer:

salad

Explanation:

The crash where the cone experience a stronger force is option D because: Crash 1: the force on the black hockey puck was stronger in this crash, so the force on the cone was also stronger.

The ball is drawn back to Earth by gravitational force. The ball returns to Earth as a result of friction. The ball is forced back toward Earth by magnetic force.

A puck's velocity changes when a player makes contact with it when it is still. He causes the puck to speed up, in other terms. The hockey stick's force, which causes the acceleration, is responsible. The velocity grows as long as this force is in motion.

Therefore, the force applied to an object must be larger than what is required for a progressive slowing down if the object must be slowed down quickly. For instance, a bicycle's brakes will slow or stop it more quickly the more force is given to it.

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See full question below

After hockey practice, Carissa and Keenan were playing a game where they were pushing some objects to get them to crash. They were using a cone and two different pucks—a black one with more mass for Crash 1 and a blue one with less mass for Crash 2. They want to know what happened to the cone.

Use the information from the diagram to answer.

In which crash did the cone experience a stronger force? How do you know?

answer choices

There was no force on the cone. In both crashes, only the hockey puck experienced a force.

The diagram doesn’t tell you anything about the force on the cone. It only gives information about the force on the pucks.

It was the same force in both crashes; the hockey puck changed speed by the same amount in each crash, so the force on the cone was the same each time.

Crash 1; the force on the black hockey puck was stronger in this crash, so the force on the cone was also stronger.

The rate of effusion of substance A is 3 times the rate of effusion of substance B, and molar mass of A is 4g/mol, then molar mass of B is 36g/mol.

Graham Law:

The rate of effusion of a gaseous substance is inversely proportional to the square root of its molar mass. This is called Graham's Law

R = k/√M

where k is constant and m is molar mass of the substance.

rate of effusion of substance A is 3 times the rate of effusion of substance B.

molar mass of substance A is 4.00g/mol

Ra = 3Rb

Ra/Rb = √Mb/√Ma

3Rb/Rb = √Mb/√4

3 = √Mb/2

√Mb = 6

Mb = 36

so, molar mass of substance B is 36g/mol.

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Answer:due to unequal heating

Explanation:

The mass of 2.9 mol of the given compound is 4854.89 g.

A mole can be specified as a standard unit that is used to determine a given count of particles. A mole can be used to evaluate a huge number of quantities of atoms, or molecules.

Given, the atomic mass of the X = 189.5

The atomic mass of Y = 197.6

The atomic mass of Z = 115.7

The molecular formula of the compound is X₁Y₄Z₆.

The mass of one mole or molar mass = 189.5 + 4 (197.6) + 6(115.7) = 1674

Given, the number of moles of X₁Y₄Z₆ = 2.9 mol

The mass of 2.9 moles of X₁Y₄Z₆ = 2.9 × 1674 = 4854.89 g

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Answer:

solubility

Explanation:

the solid substances will be added to water to see which one is soluble

Answer:

More mass means more force is needed to achieve the same change in speed in the same amount of time. That force is transmitted from the road, to the tires, to the wheels, through the brakes, to the frame and rider.

The weight on a bicycle affects the force required to accelerate it as it increases inertia it will slow down its rate of acceleration.

Acceleration is defined as the rate of change of velocity of an object with respect to time. These are vector quantities which have magnitude as well as direction.

The orientation of the acceleration of an object as given by the orientation of the net force acting on that object. It is expressed as:

[tex]\overline{a} = \frac{v - v_0}{t} = \frac{\Delta v}{\Delta t}\overline{a} = average acceleration\\v = final velocity\\v_0 = starting velocity\\t = elapsed time[/tex]

Acceleration is proportional to the force applied, so the greater the force, the greater the speed of the object in the direction of the force. Mass is inertia, which is the reluctance to accelerate, so for the same force, more massive objects experience smaller acceleration than less massive objects.

Thus, the weight on a bicycle affects the force required to accelerate it as it increases inertia it will slow down its rate of acceleration.

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If 22 g acetaminophen (151.163 g/mol) was generated. The percent yield of the reaction is 72.78 %.

Calculation :

C₆H₇NO  +  C₄H₆O₃  --> C₃H₉NO₂ + C₂H₄O₂

0.20 moles   0.25 moles    22g

limiting reagrnt  --> C₆H₇NO

from reaction equation

.20 mol of acetaminophen = .20*151.163 = 30.23 g

% yield = (practical/ theoritical)yield* 100 = 72.78 %

reaction yield. The reaction yield (absolute yield) of a chemical reaction is the amount of pure, dry product recovered from the reaction. Relative yield or percent yield (%) is commonly calculated to measure the efficiency of chemical reactions in organic synthesis.

Yield, also called reaction yield, is a measure of the molar amount of product to reactant consumed in a chemical reaction, usually expressed as a percentage.  Yield is one of the main factors that scientists must consider in organic and inorganic chemical synthesis processes. [2] In chemical reaction engineering, “yield,” “conversion,” and “selectivity” relate to unwanted products, how much of the starting material is consumed (conversion), how much of the desired production A term used to describe the rate at which something is formed (yield). (selectivity) represented as X, Y, and S

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The stratosphere, which can be found above the troposphere and below the mesosphere, is the second layer of the Earth's atmosphere (/straetsfr, -to-).

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the empirical composition of this substance Its molecular weight has also been calculated to be around 156.

the molecular equation Response: CGHG.

Calculate the grams of carbon and hydrogen in 4.40 g of CO2 and 2.70 g of H2O, respectively.

4.40 g x (12.011 g/44.0098 g) = 1.20083 g of carbon

2.70 g times (2.0158 g / 18.0152 g) Equals 0.3021482 g of hydrogen

2) Calculate the corresponding number of moles from the grams of C and H molecular weight..

20083 g / 12.011 g/mol = 0.09998 mol of carbon

In terms of hydrogen, 0.3021482 g / 1.0079 g/mol equals 0.2998 mol

3) To break up the molar amounts listed above into smaller, more manageable amounts, divide each one by its lowest value.

numbers.

0.09998 mol/0.09998 mol = 1 for carbon.

hydrogen: 0.298 mol/0.0998 mol = 2.9986 mol = 3

We have now discovered the solution: the substance's empirical formula is CGHG

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The concentrations of all species present in a 0.29 m solution of ethylammonium chloride  is 0.00000223

pKa for C2H5NH3+ = 10.7

pKw = 14.0

pKa + pKb = pKw

10.7 + pKb = 14.0

pKb = 14.0 - 10.7

pKb = 3.30

C2H5NH3Cl is a salt of ethylamine and HCl so it will dissolve in water to produce  C2H5NH3^+ + Cl^-

The base hydrolysis reaction:  C2H5NH3^+(aq) + H2O(l) <=> C2H5NH2(aq) + H3O^+(aq)

This reaction is described by Kb.

Kb = [C2H5NH2][H3O^+]/[C2H5NH3^+]

Let [C2H5NH2] = [H3O^+] = x,

so [C2H5NH3^+] = 0.29 - x

Kb = x^2/(0.29 - x) = 2.00 x 10^-11  

Let's solve for x. In this equation,  It is possible to solve without the use quadratic equation. So we can assume that 0.29 - x  is approximately equal to 0.29.  We won't know until we do the calculation.

We get:  x^2 + 2.00 x 10^-11x - 4.99 x 10^-12 = 0

With the use of a quadratic calculator.

x = 2.23 x 10^-6 M = [C2H5NH2] = [H3O^+]

0.29- x  is just 0.26 M in this problem because 2.23 x 10^-6 M is insignificant.

[C2H5NH3^+] = 0.29 M = [Cl^-]

NOTE:

pH = -log [H3O^+] = -log(2.23 x 10^-6) = 5.65

Ka is the acid dissociation constant

Kb is the base dissociation constant

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Melting and freezing refer to the changes in state which occur when the solid and liquid states interchange. Melting occurs when a solid is heated and turns to a liquid and freezing occurs when a liquid is cooled and turns to a solid.

Answer:

Melting and freezing both require energy, however melting involves the speeding up of molecules, and freezing involves slowing them down

Explanation:

The mole fraction of sulfur hexafluoride gas X(SF₆) = 0.361 and the mole fraction of dinitrogen difluoride gas X(N₂O) = 0.639

moles of each gas

n = m / M

where,

n: moles and m: mass, M: molar mass

SF₆: 16.7 g / 146.06 g/mol = 0.114 mol

N₂O: 8.88 g / 44.01 g/mol = 0.202 mol

The total number of moles is 0.114 mol + 0.202 mol = 0.316 mol

To calculate the mole fraction of each gas

X = moles of gas / total number of moles

X(SF₆) = 0.114 mol / 0.316 mol = 0.361

X(N₂O) = 0.202 mol / 0.316 mol = 0.639

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Magnesium and calcium are 2nd group elements with 2 valence electrons. They are metals in room temperature and easily lose these electrons to nonmetals such as oxygen.

Magnesium is 12th element in periodic table. It is 2nd group element and is a called alkaline earth metals. Its group members are calcium, strontium, and barium.

They contains 2 valence electrons which can be easily lost to a non-metal. Oxygen is highly electronegative element and it contains 6 valence electrons and need two more electrons to achieve octet.

Al is 13th group element it is not as much electropositive as alkaline earth metals. It contains 3 valence electrons and thus it need to lose all these 3 electrons to achieve octet. Hence, Al is less reactive towards O2 in comparison with Mg and Ca.

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The value of the density of wood that is 0.5g/cm³ in SI units would be  500  [tex]kg/m^3[/tex].

The SI unit is an acronym for the international system of units. It is a system that guides measurements generally in science. It consists of 7 base units:

Thus, for a density that is in g/cm³, the SI unit should be kg/m3.

0.5 g/cm³ = 0.5g/1 cm³

1 g = 0.0001 kg

0.5 g = 0.5/1000 = 0.0005 kg

1 cm³ = 1 x [tex]10^{-6[/tex] [tex]m^3[/tex]

Thus, 0.5 g/cm³ = 0.0005 kg/1 x [tex]10^{-6[/tex] [tex]m^3[/tex]

                            = 500  kg/m^3.

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The Rf of diphenylmethanol (product) is smaller than that of the benzophenone(reactant) .

What is benzophenone used in?

In addition to being a flavoring agent, fragrance enhancer, perfume fixative, and additive for plastics, coatings, and adhesive formulations, benzophenone is also utilized as a UV curing agent. In order to protect cosmetics from harm from ultraviolet light, benzophenone is also used as a screen.

What are the side effects of benzophenone?

Both photocontact dermatitis and the raditional allergic contact dermatitis are caused by benzophenone sensitivity. Products containing benzophenone or benzophenone derivatives may produce redness, swelling, itching, and fluid-filled blisters in people who are allergic to benzophenone.

What is Diphenylmethanol used in?

Diphenylmethanol (DPM) and its derivatives are crucial components in the production of cosmetics, drugs, and practical organic compounds.

How do you make Diphenylmethanol?

A Grignard reaction involving phenylmagnesium bromide and benzaldehyde can produce diphenylmethanol. The reduction of benzophenone using sodium borohydride, zinc dust, or sodium amalgam and water is an alternate approach.

As, we know that,

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Sedimentary rock layers are referred to as rock strata.

A rock is a dense mass of mineral grains that have grown or been cemented together over time. There are big rocks and little rocks. Pebbles are little rocks.

The sediment grains that are deposited by water, wind, or ice become sedimentary rocks. They are always formed in layers and are referred to as "beds" or "strata," and frequently include fossils.

Weathering, erosion, deposition, compaction, and cementation are the processes that result in the formation of these horizontal layers. Newer layers are deposited and created during this process on top of older layers, allowing for the relative dating of each layer.

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Democritus said matter can not be divided indefinitely, Aristotle said that matter was made of four elements while John Dalton proposed a modern atomic model based on experimentation. Rutherford said atoms are mostly empty space, Thompson brought about negative electrons in a positive framework.  Bohr said that electrons orbit the nucleus in “shells.

There are many atomic models that was proposed which includes:

Rutherford in his experiment shot alpha (α) particles at gold foil whereby most particles passed through.

Hence he concluded the following:

Some positive α-particles deflected or bounced back.

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