Feedback can either cause a change in the system or keep it stable. Melting glaciers are an example of positive feedback.

Why is this considered positive feedback?

The mass of the peanut butter that you took out of the container is 34.1 ounces

The conversion factor is the manner in which we are able to change a value from one unit to another, Let us recall that there could be several units that could be used for a particular calculation and many times it is necessary to convert a value from one of the units to another for ease of calculation.

Mass of the crunchy butter =  1.26 kg

Percent used = 7.7%

Mass of the  crunchy butter used =  7.7/100 * 1.26 kg = 0.97 Kg

To convert to ounces;

0.97 Kg * 35.247 ounces/1 Kg

= 34.1 ounces

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The dissociation constant of Ka is 7.83 × 10³ .

In chemistry, the molar mass of a chemical compound is determined by dividing its mass by the quantity of the material, or the number of moles in the sample, expressed in moles. A substance's molar mass is a bulk attribute, not a molecular one. Mass per mole is one way to define molar mass. Molar mass is, in other words, the total mass of all the atoms in a substance that makes up a mole. It is quantified in grams per mole.

Molar mass is shown for substances or molecules. The molar mass of a single element or atom would simply be that element's mass represented in atomic mass units.

Mass of HN[tex]O_{2}[/tex] = 1.93g

Volume of solution = 500 ml

[tex]H^{+}[/tex] equilibrium = 7.63 × [tex]10^{3}[/tex] m

Molarity of HN[tex]O_{2}[/tex] = mol [tex]HNO_{2}[/tex] /vol in2

mol [tex]HNO_{2}[/tex]

= mass(g) / molar mass

= 1.93/42.0129 g/mol

= 0.04105

Hence ,

molarity of HNO2

= 0.04105/0.5L

= 0.0821 M

Reaction

HNO2 ⇄ H+  NO2

x = [tex]H^{+[/tex] = 7.63 × [tex]10^{3}[/tex] M

= 0.0821 - 7.63 [tex]10^{3}[/tex]

= 0.0821 - 0.00763

= 0.0745 m

[tex]H^{+}[/tex] = 7.63 × [tex]10^{3}[/tex]

[tex]NO_{2}[/tex]  = x = 7.63 × [tex]10^{}[/tex]³

Dissociation of constant ka

ka = [tex]H ^{+} NO_{2} ^{-}[/tex]/ HNO²

=[tex]10^{3}[/tex]  × 7.83

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70.33 L  is the volume of 10 moles of a gas at 300 K held at a pressure of 3.5 atm.

Volume is the percentage of a liquid, solid, or gas's three-dimensional space that it occupies.

Liters, cubic metres, gallons, millilitres, teaspoons, and ounces are some of the more popular units used to express volume, though there are many others.

We will use ideal gas law to find the volume

PV = nRT

Can also be written as

V = (nRT)/P

Where,

P = pressure

V = volume

n = amount of substance

R = ideal gas constant

T = temperature

Here, we have given

P = 3.5 atm

V = to find

n = 10 moles

R = 0.08206 L⋅atm/K⋅mol

T = 300k

Lets substitute the values

V = (10 × 0.08206 × 300)/3.5

V =  70.33 L

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The molarity of the 20 mL H₂SO₄ solution required for the titration is 0.0388 M

We can obtain the molarity of the H₂SO₄ solution by doing the following:

H₂SO₄ + 2LiOH —> Li₂SO₄ + 2H₂O

The mole ratio of the acid and base obtained from the equation is:

From the question given, we obtained the following:

MaVa / MbVb = nA / nB

(Ma × 20) / (0.1 × 15.5) = 1 / 2

(Ma × 20) / 1.55 = 1 / 2

Cross multiply

Ma × 20 × 2 = 1.55

Ma × 40 = 1.55

Divide both side by 40

Ma = 1.55 / 40

Ma = 0.0388 M

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Answer:

6.022 X 1023 atoms

Explanation:

Answer:

7.06 x 10⁴ J

Explanation:

To find the amount of heat necessary to heat the water, you need to use the following equation:

Q = mcΔT

In this equation,

-----> Q = heat (J)

-----> m = mass (g)

-----> c = specific heat capacity (J/g°C)

-----> ΔT = change in temperature

The specific heat capacity of water is 4.186 J/g°C. You can plug the given values into the equation and simplify to find "Q".

Q = ? J                              c = 4.186 J/g°C

m = 225 g                        ΔT = 100.0°C - 25.0°C = 75.0°C

Q = mcΔT                                                  <----- Given equation

Q = (225 g)(4.186 J/g°C)(75.0°C)              <----- Insert values

Q = 7.06 x 10⁴ J                                        <----- Multiply

Answer: ionic bond

Explanation:

Based on the given relative atomic masses of the isotopes, the mass of Na-22 contained in this sample is 0.086 g.

The relative atomic mass of an element is the average mass of one mole of an atom of an element calculated from the atomic masses of the atoms of an element and their relative abundances.

Isotopes of elements are atoms of an element that differ from each other by their masses. The difference in the mass of the isotopes is a result of the difference in the number of neutrons contained within the nucleus of the atoms of the isotopes.

Considering the naturally occurring sodium isotope, Na-23, and the synthetic, radioactive isotope of sodium, Na-22:

the relative atomic mass of Na-23 = 22.9898 u

the relative atomic mass of Na-22 = 21.9944 u.

mass of sample = 2.4698 g

the apparent atomic mass of the isotope = 22.9551 u

Sum of the relative abundances = 1

Let relative abundance of Na-22 = x

relative abundance of Na-22 = 1 - x

22.9898 * (1 - x) + 21.9944 * x = 22.9551

22.9898 - 22.9898x + 21.9944x = 22.9551

0.9954x = 0.0347

x = 0.035

Mass of Na-22 in the sample = 2.4698 * 0.035

Mass of Na-22 in the sample = 0.086 g

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Based on the principles of spectrophotometry, the least useful to determine the concentration of the sample using a spectrophotometer set at 640nm is: the volume of a sample; option A.

Spectrophotometry is an analytical technique that is used to measure the concentration of a solution by measuring how much light the solution absorbs or transmits when a beam of light of a given wavelength is passed through it.

In spectrophotometry, the concentration of a solution is directly proportional to its absorptivity. This implies that the higher the concentration of a solution, the higher the amount of light absorbed by the solution.

The absorptivity of the solution is inversely proportional to the transmissivity of the solution.

The higher the concentration, the lesser the amount of light the solution will transmit.

The factors that are important in calculating the concentration of a solution are:

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According to the given statement the molarity of the potassium chloride solution is 1068.75 moles KCL .

The molarity of a material refers to the amount of it that is present in a given solution volume (M). Molarity is indeed the measure of how many moles of a solute are contained per liter of a solution. It is commonly referred to as the molar concentration of the solution.

To find the number of moles of potassium chloride, your solute, use the compound's molar mass, the mass of one mole of potassium chloride

1 mole of KCl = 74.55 g

255 g/1mole of KCL

255g / 74.55g

=3.420 g

Molarity is expressed per liter of solution. Since you dissolve 3.420 moles of potassium chloride in 3.20 mL of solution, that 1.0 L will contain

[tex]$1.0 \mathrm{~L} \cdot \frac{10^3 \mathrm{mL}}{1L} \cdot \frac{3.420\mathrm{moles}}{3.20 \mathrm{mL}}$[/tex] = 1068.75 moles KCL

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The area of this flag in square centimeters is 10.58 × [tex]10^{7} cm^{2}[/tex].

The quantity of unit squares that fit inside a shape determines its area. A unit square is a square having a side of one unit, as "unit" here denotes one (1). The total number of unit squares that are contained within a rectangle's perimeter is hence its area. Or, you can refer to the area of the rectangle as the region included within the rectangle's envelope. The rectangular tiles that make up your home are a fantastic illustration of form. The number of tiles on the floor makes it simple to calculate how much area it takes up. You may calculate the rectangle's area using this as well. A number of unit squares equal the area of a rectangle.

Area of flag = area of a rectangle

= l × b

=  1.26 × [tex]10^{4}[/tex]   ×   8.40 ×[tex]10^{3}[/tex]

= 10.58 × [tex]10^{7}[/tex] [tex]cm^{2}[/tex]

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The value of the difference of 147.6 mm and 0.82 mm is equal to 146.78 in units of mm.

Scientific notation is a method of expressing numbers that are too large or too small to be conveniently written in decimal form. The scientific notation may be referred to as standard index form or scientific form.

This base ten notation is generally used by mathematicians, scientists,  and engineers. The scientific notation of nonzero numbers can be written in the form [tex]m \times10^n[/tex] or 'm' times 10 raised to the power of n, where n is an integer.

To calculate the difference of 147.6 mm and 0.82 mm:

147.6mm − 0.82mm = 146.78 in the units of mm

As we know one millimeter is equal to 10⁻³ meters. As mentioned in the question, keep the unit 'mm' which is a millimeter.

Therefore, 147.6mm − 0.82mm = 146.78 in units of mm.

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The three rules for writing net ionic equations are actually quite simple. Consider only breaking up the (aq) substances. Only strong electrolytes should be broken up. Any ions that appear on both sides of the equation should be removed.

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The brain does not return to normal as soon as someone stops taking drugs because brain receptors become overwhelmed. Dopamine synthesis is reduced or dopamine receptors are eliminated in the brain.

Endorphins, which are natural opioids produced by your body, are used to block pain signals.

Peripheral/nociceptive pain is associated with injuries that harm your skin and muscles, such as pinpricks and stove burns.

Pain fibers detect these wounds and transmit the signal to the neurons in your spine and brain, the two structures that make up your central nervous system.

Your pain fibers and central nervous system normally cooperate in a condition. Your brain says "ow" and instructs your body how to respond when someone punches you. Release of stress-relieving chemicals. Your immune system combats the swelling in your injured arm.

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Answer:

Can't decide, Can't decide, and mixture.
Hopefully this is right. Technically you also can't decide on C but the chances of it being a pure substance are very low.

Explanation:

Technically, you can't decide on any of them since you have no idea of the actual compositions. Even if the ratio of the elements in grams are the same, there is no guarantee that the elements are chemically combined. For example, if you are given the info that a box contains 1 gram of hydrogen and 8 grams of oxygen, it could contain 9 grams of water, or 1 gram of hydrogen gas and 8 grams of oxygen gas. Knowing that water contains 1 gram of hydrogen and 8 grams of oxygen per 9 grams of oxygen doesn't help you determine if a container with 2 grams of hydrogen and 8 grams of oxygen has hydrogen peroxide or just a mix of the two gasses.
For A, it could be a pure substance since the ratio of E1 to E2 is twice the ratio of E1 to E2 in substance X. You can't really decide though
For B, it could be a pure substance since the ratio of E1 to E2 is four times the ratio of E1 to E2 in substance X. You can't really decide though
For C, It is very likely to be a mixture, since the ratio of E1 to E2 in substance C is 2.7 times that of the ratio of E1 to E2 in substance X

Answer:

Yes, soap solution is acidic. You verify its acidity by using a red litmus paper.

Explanation:

The soap is a weakly acidic. To verify that the soap solution is acidic, put a drop of soap solution on a red litmus paper, color change will be observed and the red litmus paper will turn into blue. This gives us the evidence that soaps are acidic.

1. The behavior of submicroscopic particles can sometimes be described as waves - True

2. Quantum mechanics limits us to making statistical statements about the location of an electron in an atom - True

3. The uncertainty principle is important only for particles of very small mass, such as the electron - True

Quantum mechanics is the branch of science that deals with the particles that we have in the atom. The study of quantum mechanics led us to appreciate the position of the electrons that are found in the atom.

The spear head of the study of quantum approach to the atom was Erwin Schrodinger when he proposed the wave mechanical model of the atom.

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The mass of water  produced in the oxidation reaction is 2.5 g.

Oxidation reaction of ethanol occurs when ethanol comes in contact with oxygen, producing water and acetic acid. This type of reaction can also produce carbon dioxide and water.

The oxidation reaction of ethanol and oxygen is given as;

CH₃CH₂OH  + O₂  -----------> H₂O  +  CH₃COOH

Molecular mass of ethanol;

CH₃CH₂OH = (12) + (3 x 1) + (12) + (2 x 1) + (16) + (1) = 46 g/mol

Molecular mass of water;

H₂O  = (2 x 1) + (16) = 18 g/mol

From the reaction above, we can infer the following;

46 g of ethanol ---------> 18 g of water

6.5 g of ethanol ---------?

= (6.5 x 18) / 46

= 2.54 g of water

Thus, the mass of water that is produced by the reaction of 6.5g of ethanol is 2.5 g.

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Answer:

0.04 mole or 1.23 g

Explanation:

1 mole of P has 6.02 x 10^23 atoms

so quantity in moles of P of 2.40 x 10^22 atoms equal

1 mole x (2.40 x 10^22)/(6.02 x 10^23)

= 0.03986710963 or 0.04 mole

1 mole of P = 6.02 x 10^23 atoms = 30.97 g

2.40 x 10^22 atoms weights

(30.97)(2.40 x 10^22)/(6.02 x 10^23)

= 1.23468438538 or 1.23 g

In the International Space Station on near-vacuum space, the bare metal surfaces can reach temperatures above 260℃ as the side of the station facing the sun receives thermal energy via electromagnetic radiation (A).

Space is nearly vacuum i.e., it has no air in space. Conduction and convection of heat requires air. As space is nearly vacuum, conduction and convection of heat does not happen on bare metal surface on International Space Station.

The only mode of heat transfer in space is Radiation. The space station surface facing away from sun would be cold as the stars are far away from our solar system to heat them up. Thus, the side of the station facing the sun receives thermal energy via electromagnetic radiation.

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The heat made by a mixture of gases is less than that produced by solitary gases of hydrogen or oxygen.

The property becomes a solution of a homogeneous mixture. Some of the effects of gas mixtures are easy to control. if we know the composition of the gases in the mix. In gas mixtures, all components in the gas phase can be used separately. The atmosphere is a mixture of different gases. The part, usually present in solution, first has to be atomized in a flame. Premixed combustion flame, a mixture of fuel and oxidant gas, and diffusion. compared to liquid streams, is relatively simple because the bulk characterization of a single phase is implicit. However, when gas. The heat produced by a mixture of gases is less than that produced by solitary gases. of hydrogen or oxygen.

so we can conclude that the flame appears yellow if there are impurities in the air whereas a pure hydrogen gas flame will not produce any smoke.

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Answer:

About 0.479 moles

Explanation:

The average atomic mass of rubidium is 85.466 amu.

For calculating the average atomic mass of the Rb, the atomic masses for both isotopes are taken into consideration.

The [tex]^{85}{Rb[/tex]  has atomic mass = 84.912 amu

The abundance of  [tex]^{85}{Rb[/tex]      = 72.17 %

The average atomic mass of  [tex]^{85}{Rb[/tex]     = 72.17 %

The average atomic mass of [tex]^{85}{Rb[/tex]   =[tex]84.912\times\frac{72.17}{100}[/tex]

                                                     = 61.28 amu

The   [tex]^{85}{Rb[/tex]  has atomic mass = 86.909 amu

The abundance of   [tex]^{85}{Rb[/tex]     = 27.83%

The average atomic mass of  [tex]^{85}{Rb[/tex]   =  [tex]86.909 \times \frac{27.83}{100}[/tex]

                                      = 24.186 amu

The average atomic mass of Rb will be = [tex]^{85}{Rb+ ^{87} Rb[/tex]

= 61.28 + 24.186 amu

= 85.466 amu.

The average atomic mass of rubidium is 85.466 amu.

Isotopes can be defined as varieties of chemical elements that have the same number of protons and electrons but different numbers of neutrons. In other words, isotopes are varieties of elements that differ in their number of nucleons (the total number of protons and neutrons)  due to differences in the total number of neutrons in their nuclei.

The three isotopes of hydrogen

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My ability to interconnect my understanding in biology, chemistry and homeostasis makes me a great scientist as I will apply all these in my future career by:

These are the hormones which are released when we suddenly find ourselves in a dangerous or life threatening situation such as we need manage risk or prevent accident. This hormone is known as adrenaline. They are known as flight or fight hormones.

So therefore, the knowledge I acquired from biology, chemistry and homeostasis will used to make my career more productive in the nearest future.

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Answer:

[tex]\small\color{black}\boxed{\colorbox{green}{√ Verified Answer}}[/tex]

A compound is defined as a pure substance that is made up of two or more elements in a fixed ratio by mass.

A molecule is the smallest part of an element or a compound that can exist independently.

is a compound called Calcium sulphide. It is formed by the chemical combination of calcium and sulphur . It represents one molecule of the compound. Each molecule of this solid contains one atom of calcium combined with one atom of sulphur.

..

Polar  molecule : [tex]NH_{3} , HF, H_{2}O, CH_{3}F.[/tex]

Non Polar Molecules : [tex]CH_{4}, BeCl_2[/tex]

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Answer: N2O4

Explanation:

N2H4  molecular weight is 32   150g/32 = 4.7 mol

N2O4 Molecular weight is 92  200/92 = 2.2 mol

So the N2O4 has less moles present and will be the limiting reactant.

The electrical charge of the nucleus of an atom is +12 then 12 electrons does the atom have in its neutral state

Basic property of matter carried by some elementary particles that governs how the particles are affected by an electric or magnetic field and when a neutral atom gains or loses electrons, it becomes an ion and heavier atoms tend to have more neutrons than protons, but the number of electrons in an atom is always equal to the number of protons and so an atom as a whole is electrically neutral

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