Which diagram represents the correct proportion of 87Rb to its decay
product, 87Sr, after two half-lives?

The  correct ordering of K, Fe, Se, and Kr from largest atomic radius to smallest is K > Fe > Se > Kr.

The atomic radius of an element can be defined as  distance from the nucleus to the outermost shell of the atom. The trend of atomic radius in the periodic table is that when we move from top to bottom in a group the atomic radius of chemical element increases . when we move from left to right in a period the atomic size decreases. so according to this the atomic size of given elements from largest atomic radius to smallest atomic radius is K > Fe > Se > Kr.

Thus, The  correct ordering of K, Fe, Se, and Kr from largest atomic radius to smallest is K > Fe > Se > Kr.

To learn more about atomic radius here

https://brainly.com/question/13607061

#SPJ4

Wetlands being drained for housing development are an example of habitat destruction.

A wetland is a place where land is seasonally or permanently covered with salt water, fresh water, or something in between.

Habitat destruction is the elimination or alteration of the conditions necessary for the survival of plants and animals, affecting the health of individual species as well as the global ecosystem. Group of dwellings or condominiums, generally of similar construction, generally constructed and sold or leased by a manager. Habitat destruction can lead to species loss.

Drainage of wetlands into housing estates therefore causes habitat destruction.

To know more about Habitat Destruction visit:

https://brainly.com/question/26192242

#SPJ4

A response has an 80% percent yield.

The real yield is calculated as the theoretical yield divided by the theoretical yield multiplied by 100. % Yield = (Actual Yield % Theoretical Yield Numerous factors, which will be covered in later chapters of the course, can cause a chemical reaction's actual yield to be lower than its theoretical yield.

It is beneficial to have a high yield percentage since it shows that there were fewer contaminants present throughout the experiment and it can improve computation accuracy.

Balanced equation is,

2C₂H₂ + 5 0₂----> 4 CO₂ + 2 H₂O

percent yield of reaction is = moles of product/moles of reactant×100

actual moles of acetylene is = 5/2=2.5

actual moles of Co₂ is = 8/4=2

percent yield of reaction is = 2/2.5×100

percent yield of reaction is = 80%.

To know more about percent yield visit:

https://brainly.com/question/25781371

#SPJ4

When the wavelength of a wave increases, the frequency of the wave decreases.

Wavelength is the length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next.

Wavelength is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency.

Wavelength can be calculated as follows;

λ = v/f

The relationship between wavelength and frequency is inverse i.e. as one increases, the other decreases.

Therefore, as the frequency decreases, the wavelength increases and vice versa.

Learn more about wavelength and frequency at: https://brainly.com/question/18651058

#SPJ1

1:1 is the molar ratio of acid to base for the neutralization reaction between HCl and NaOH.

HCl + NaOH → NaCl + H₂O

A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water. The neutralization of a strong acid and strong base has a pH equal to 7.

Neutralization is the reaction of an acid and a base, which forms water and a salt.

Learn more about neutralization here:- https://brainly.com/question/23008798

#SPJ4

The volume of the solution is 0.01216 L

What is  volume of a solution ?

A three-dimensional space's occupied volume is measured.  It is frequently measured numerically with SI-derived units (such the cubic meter and litre) or with other imperial units (such as the gallon, quart, cubic inch). Volume and length are related in how they are defined (cubed). The volume of a container is typically thought of as its capacity, or the amount of fluid (gas or liquid) that it could hold, as opposed to the amount of space the container occupies.

Given ,

molarity (M )= 0.400 M

Number of mole  ( n)= 0.0304 mol

Volume (V)=nM

V = 0.400 * 0.0304

V = 0.01216 L

Hence, volume of solution is 0.01216 L

To know more about volume from the given link

https://brainly.com/question/26756988

#SPJ 4

The physical properties of ammonia iare as listed below:

It the compound which is composed of four atoms one is nitrogen and rest are hydrogen.

A physical properties are those properties which is measurable and whose values describe the state of a physical system. The favourable changes in the physical properties of a given system is used to describe its changes mostly between the momentary states. Physical properties are referred as a observables. They are not kind of modal properties.

Chemical property is defined as the characteristic of the particular substance which can be observed in the chemical reaction. Some of the major chemical properties of any substance include toxicity, flammability, pH value, heat of combustion, rate of radioactive decay, and chemical stability.

Thus, we concluded that the physical properties of ammonia are as listed below:

learn more about physical properties:

https://brainly.com/question/3434774

#SPJ13

Answer:

- gas at room temperature

- strong, unpleasant odor

- dissolves easily in water

Explanation:

Answer: If you are talking about Hormones or how they have been changing recently through puberty then i think kids are now starting to look up to older people or kids so that’s why they seem older

Explanation:

please mark me as brainlist

The expected enthalpy change in the process of the vaporization of freon is 144.7 kJ.

The enthalpy change of a process or reaction is the amount of heat absorbed or evolved during by the process.

The expected enthalpy change in the process of the vaporization of freon is calculated from the formula below as follows:

Hence;

Enthalpy change = molar enthalpy of vaporization  * moles of substance

molar enthalpy of vaporization of freon = 34.99 kJ/mol

Moles of freon = mass/molar molar mass

moles of freon = 500 / 120.91 moles

Enthalpy change = 34.99 kJ/mol * 500 / 120.91 moles

Enthalpy change = 144.7 kJ

Learn more about molar enthalpy of vaporization at: https://brainly.com/question/22971824

#SPJ1

Complete question:

A common refrigerant (Freon-12, molar mass 120.91 g/mol) is alternately vaporized in tubes inside a refrigerator, absorbing heat, and condensed in tubes outside the refrigerator, releasing heat. This results in energy being transferred from the inside to the outside of the refrigerator. The molar enthalpy of vaporization for the refrigerant is 34.99 kJ/mol. If 500.0 g of the refrigerant is vaporized, what is the expected enthalpy change Δ H??

According to the principles of gravitation by Newton, every objects attracts every other objects. The gravitational force depends on the quantity of mass and the distance between objects factor that also affects the force of gravity.

Gravitational force is a kind of force by which an object attracts other objects into its centre of mass. This force of attraction depends on the mass of both objects.

Gravity is directly proportional to the mass of the object and inversely proportional to the distance between the objects. Thus force of gravity increases with mass and decreases with distance.

The sentences can be completed as:every objects attracts every other objects. The gravitational force depends on the quantity of mass and the distance between objects factor that also affects the force of gravity.

To find more on gravity, refer here:

https://brainly.com/question/4014727

#SPJ1

Answer:Match the statements for the three principles for Newton's Law of Gravitation.

1 .

Gravitational force

attracts every other object.

2 .

Every object

depends on the quantity of mass.

3 .

Distance between objects

factor that also affects the force of gravity.

please answer quick grrrr betch as neggas

Explanation:

A piece of sodium metal is dropped into a calorimeter filled with water, hydrogen gas evolves. The temperature of the mixture rises because As an intensive physical property.

Calorimeter, device for measuring the heat developed throughout a mechanical, electric, or chemical reaction and for calculating the heat ability of substances. Calorimeters have been designed in splendid range.

The frame at better temperature releases heat while the body at lower temperature absorbs heat. The principle of calorimetry shows the regulation of conservation energy, i.e. the overall warmness lost through the new frame is same to the full warmth won by way of the cold body.

The primary ice calorimeters have been built based on Joseph Black's idea of latent warmness, introduced in 1761. Antoine Lavoisier coined the time period calorimeter in 1780 to explain the apparatus he used to measure warmth from guinea pig breathing used to melt snow.

Learn more about calorimeters  here:

https://brainly.com/question/1407669

#SPJ4

copper phosphate = c

3 Cu2CO3(OH)2 + 4H3PO4 2Cu3(PO4)2 + 3CO2 + 9H2O

To learn more about copper please click on below link

https://brainly.com/question/13677872

#SPJ4

Measured value 28.7053 cm, which has six significant figures . Round the measurement to four significant figures is 28.71 cm

To count the significant number there are some rules to follow are :

Thus, Measured value 28.7053 cm, which has six significant figures . Round the measurement to four significant figures is 28.71 cm

To learn more about significant figure here

https://brainly.com/question/17345250

#SPJ1

Under far from equilibrium conditions, the intrinsic dissolving activity of the basal (010) or edge (001) surfaces of polygonal calcium sulfate anhydrite crystals and gypsum has been studied.

A field of science that studies how forces affect the motions of physical objects or how a biological or chemical system changes, as well as how quickly such a system is changing and how a natural or chemical change was brought about.

Two disciplines of physics known as kinematics and kinetics deal with how an item moves. Despite the fact that both terms have a similar pronunciation, they differ in a few ways. Equations of motion are used in kinematics to describe motion.

To know more about kinetics visit:

brainly.com/question/26590527

#SPJ4

A ring, a disk, and a solid sphere all of equal mass begin rolling down a hill together. the one which reaches the bottom first is the sphere.

A ring , a disk and a solid sphere all have equal mass. the moment of inertia of all is given as :

a ring : m r²

a disk = 1 / 2 mr²

a solid sphere : 2 / 5 mr²

where m is the mass of all . and  r is the radius which is same for all.  so the object which the the least moment of inertia will reach the bottom first.

Thus, A ring, a disk, and a solid sphere all of equal mass begin rolling down a hill together. the one which reaches the bottom first is the sphere.

To learn more about mass here

https://brainly.com/question/14651380

#SPJ4

The atomic number states the number of protons, so the number of protons in the element silicon is 14.

Atoms are made up of subatomic particles namely protons, electrons and neutrons. In an atom the three particles have a certain amount.

Protons are particles that make up atoms that are positively charged and have a mass as large as that of hydrogen, which is 1.67262 x 10⁻²⁷ kg or 1,836 times heavier than electrons. Protons are so deep in the atomic nucleus that they cannot be disturbed by particles outside the atom.

The element silicon (Si) has an atomic number = 14 and a mass number = 28

So that the number of subatomic particles is:

The number of protons = atomic number

= 14

#SPJ4

In a solution, the substance present in the largest quantity is called the solvent , while the substances dissolved in smaller quantities are called solute.

What is the difference between a solvent and solute?

In Chemistry, solvent is defined as the medium which dissolves the other substances.

In general, a solution is a combination of a solute and a solvent.

For example, let's take a mixture of water, slat and sugar.

Here water is the solvent as it is present in large quantity while sugar and salt are solutes.

To put it simply, a solution is a homogenous mixture that is formed when solute is added to the solvent.

If you need to learn more about solution click here:

https://brainly.com/question/25326161

#SPJ4

Manufacturing companies may verify ingredients and check for contaminants to make sure their products are safe to use by testing the raw materials that go into their sanitizers and disinfectants.

a material or item used to lessen or get rid of harmful elements (like germs) on surfaces. As of the beginning of September, sales with alcohol-based hand sanitizers remained roughly 17% higher than they were during the same time last year.

However, broadly speaking, sanitizers with 60 to 95% alcohol are appropriate. The Center fer Prevention and Control suggests formulations using 80% (percent quantity) ethanol and 75% isopropyl alcohol.

To know more about sanitizer visit:

https://brainly.com/question/29545088

#SPJ4

An acid is capable of donating a proton or hydrogen ion to another substance.

Acids are substances that can donate H+ ions to bases. therefore a hydrogen atom is a proton and one electron, technically an H+ ion is just a proton. A base is a molecule or ion up to accept a hydrogen ion from an acid. Acidic substances are usually recognized by their sour taste.

The stronger the acid, the more readily it donates H+. For example, hydrochloric acid (HCl) totally dissociates into hydrogen and chloride ions and is high.

So we can conclude that Acids give away particles with a positive charge. Bases receive positively charged particles. They are both critical for chemical reactions.

Learn more about acids here: https://brainly.com/question/25148363

#SPJ1

Answer:

the option is (A)

Explanation:

The balanced chemical equation is

4Fe

(g)

+3O

2(g)

→2Fe

2

O

3(g)

Thus, 4 moles of Fe reacts with 3 moles of oxygen to form 2 moles of ferric oxide.

So 8 moles of Fe will react with 3×

4

8

=6 moles of oxygen to form 2×

4

8

=4 moles of ferric oxide.

9.0−6=3.0 moles of oxygen will remain as excess.

Mass of CaCO3 per liter =115.09 milligrams.

The metric system's abbreviation mg stands for milligram. The smallest unit of weight, the milligram, is used to quantify minuscule amounts, such as powdered compounds that will be utilized in a scientific experiment. A paper clip weighs about one gram, which is the metric system's accepted unit of weight.

Molar mass of CaCO₃ = 100·0869 g/mol

moles per liter = 0.00115 mol

Mass of CaCO₃per liter = moles x Molar mass

Mass of CaCO₃ per liter = 0.00115 x 100·0869

Mass of CaCO₃ per liter =  0·11 509grams

Mass of CaCO₃ per liter = 115.09 x 10⁻³ grams

10⁻³g = 1 milligram

Mass of CaCO₃ per liter =115.09 milligrams.

To know more about milligram visit:

https://brainly.com/question/14494444

#SPJ4

The molar mass of unknown gas is 91.93 g/mol

It is Given that

[tex]r_{1}[/tex] of N2 gas =  1.812 x [tex]r_{2[/tex] of unknown gas

r1 = effusion rate of N2

r2 = effusion rate of unknown gas

[tex]r_{1}[/tex] = 1.812  [tex]r_{2[/tex]

[tex]\frac{r1}{r2}[/tex] = [tex]\sqrt[2]{m2 /m1}[/tex] =1.812

where molar mass m1 of N2 = 28 g/mol

molar mass m2 of unknown gas =?

 [tex]\sqrt{m2/28}[/tex] = 1.812

[tex]\frac{m2}{28}[/tex] = [tex]1.812^{2}[/tex]

m2 =  [tex]1.812^{2}[/tex] x 28

m2 = 91.93 g/mol

To learn more about molar mass click here:

https://brainly.com/question/20552052

#SPJ4

Answer:  Mg(s) +  H2SO4(aq)  + H2(g)

Explanation:

Magnesium sulfate:

Magnesium sulfate is a chemical compound, a salt with the formula .

Magnesium reacts with dilute Sulphur acid to form Magnesium sulfate and Hydrogen gas.

  Mg(s) +  H2SO4(aq)  + H2(g)

This reaction is a single displacement reaction and also exothermic.

Therefore, the balanced chemical equation for the reaction of magnesium solid with sulfuric acid to form hydrogen gas and magnesium sulfate is  

  Mg(s) +  H2SO4(aq)  + H2(g)

.

NADH and FADH2 donate electrons to different electron transport chain complexes because the citric acid cycle and glycolysis both rely on the oxidized forms of these electron carriers to function, and these forms must be readily available.

Through oxidative phosphorylation, the mitochondrial electron transport chain uses a series of electron transfer reactions to produce cellular ATP. Reactive oxygen species (ROS), which support both homeostatic signaling and oxidative stress during disease, are produced as a result of electron transport.

In this visual presentation, we give an overview of oxidative phosphorylation and how it interacts with the electron transport chain's creation of ROS. We also provide various translational methodologies for evaluating mitochondrial energetics in both healthy and unhealthy conditions.

To know more about electron transfer in mitochondria, visit:

https://brainly.com/question/29308137

#SPJ4

The solution is then said to be saturated at 80°C

The amount of a solute that will dissolve in a fixed amount of solvent (often 100 grams of water) at a specific temperature to create a saturated solution is known as its solubility.

To show the solubility at various temperatures, a solubility graph is drawn. One can determine the mass of a solute that can dissolve at particular temperature, whether or not a solution is saturated, and compare the solubilities of various compounds at particular temperatures by looking at a solubility graph. These graphs allow us to determine if the solution is saturated or unsaturated.

We can conclude that the solution is saturated in this scenario because some solids are already not dissolved in the solution.

Learn more about the topic solubility graph: https://brainly.com/question/8591226

#SPJ13

Answer:

14kg

Explanation:

your equation is wrong ?

it is meant to be c+o=co

we have the mass of c so we calculate the mole and mole =mass\molar mass

molar mass(M) of carbon is 12 so our mole is

6/12=0.5 mol

note the unit of mole is mol

so since from the equation 1c+1o=1co we see that there is an invincible 1 there fore c and co is 1:1 so therefore o.5 mol of c will produce o.5 mol of Co

if the ratio was 1:2 it would have been therefore 0.5 mol of c will make 0.5/2 mol of Co.

but that is not the case so back to what we were saying. note(just saying and example,not part of answer )

to find mass of Co it will be mole = mass/ M

so mass= mole × molar mass and the molar mass of Co is (12)+(16)=28 kg/mol so our mass will be 0.5×28= 14kg

therefore the mass of Co is 14kg

From system equation to make 10 liters of 25% saline solution  we need 2.5 L saline 40% and 7,5 L saline 20%

to calculate how much saline solution 40% and 20% needed to make 10L 25% saline solution we can calculate by system of equation below:

We can call the amount of 40% solution x and the amount of 20% solution y.

x + y = 10  (1)

0.40x + 0.20 y = 10 * 0.25

0.40x + 0.20 y = 2.5  

4x + 2y = 25 (Multiply by 10 to get rid of decimals) (2)

we use elemination way to get the x

2x + 2y = 20(Multiply (1) by 2)  (3)

so if formula (2) - formula (3)

4x + 2y = 25

2x + 2y = 20 -

2x = 5

x = 2.5      

y= 10-x

y= 10- 2.5 = 7.5

so we need 2.5 L saline 40% and 7,5 L saline solution 20%

Learn more about Saline solution here brainly.com/question/4934751

#SPJ4