pls help!

EXPERIMENTAL QUESTION: How does the amount of substance affect the rate at which temperature changes?

HYPOTHESIS: If the mass of a sample of water is increased, then the rate at which its temperature changes will be ____________________.

increased
decreased

Answers

Answer 1

Answer:

I'm guessing you are asking for the word that will make the hypothesis correct. In that case, it would be:
"If the mass of a sample of water is increased, then the rate at which it's temperature changes will be decreased."

Explanation:

Mass and temperature have an inverse relationship, so when one of the values increase, the other decreases. On Study.com there is more on this subject. I will put a link for you :)

https://homework.study.com/explanation/how-does-the-amount-of-a-substance-affect-the-rate-at-which-temperature-changes.html#:~:text=For%20a%20given%20amount%20of,a%20smaller%20increase%20in%20temperature.

I hope this helps!


Related Questions

ernest rutherford developed an experiment that showed protons can pass through gold atoms untouched and/or un-deflected. sometimes the protons were deflected by something, but this did not happen too often. most of the atoms pass straight through. his experiment changed the way scientists viewed the structure of an atom. what conclusion did rutherford draw from his experiment?

Answers

Rutherford conclusion was: Inside of the gold atom consists of empty spaces.

Rutherford theorized that atoms have their charge concentrated in a very small nucleus.

This was famous Rutherford's Gold Foil Experiment: he bombarded thin foil of gold with positive alpha particles (helium atom particles, consist of two protons and two neutrons).

Rutherford observed the deflection of alpha particles on the photographic film and notice that most of alpha particles passed straight through foil.

That is different from Plum Pudding model, because it shows that most of the atom is empty space.

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Draw the structure of an alkane or cycloalkane that has more than three but fewer than ten carbon atoms, and only primary hydrogens.

Answers

There here’s your answer buddy

What is a mathematical formula you can make to determine the mass number?

Answers

Answer:

Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons.

what is the cell potential at 250c for the following galvanic cell?pb(s)|pb2 (1.0m)||cu2 (1.0 x 10-4 m)|cu(s)

Answers

The cell potential at 250c for the following galvanic cell

pb(s)|pb2 (1.0m)||cu2 (1.0 x 10-4 m)|cu(s)

is 0.345V.

What is Electrolytic cell?

It is a device that is used for the conversion of the electrical energy of the redox reactions into a chemical energy.

What is redox reaction?

The reaction in which reduction and oxidation reaction both take place in the reaction is known as redox reaction.

What is oxidation reaction?

Oxidation reaction are those reaction in which compound or substance looses its electron. In this type of reaction, oxidation state of an element increasing.

What is reduction reaction?

Reduction reaction are those reaction in which compound or substance accept the electron. In this type of reaction, oxidation state of an element goes on decreasing.

Reaction at cathode:

Cu+2 + 2e ------ Cu E°(anode) = -0. 126V

Reaction at anode:

pb ------- pb(+2) + 2e E°(cathode) = 0.337

E°cell = -0.126 -0.337

= -0.463V.

As we know that,

E cell = E°cell -0.059/2(log([cathode]/[anode])

= -0.463 - (0.059/2) × (-4)

= -0.463 + 0.118

= 0.345V

Thus, we concluded that the cell potential at 250c for the following galvanic cell

pb(s)|pb2 (1.0m)||cu2 (1.0 x 10-4 m)|cu(s)

is 0.345V.

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A yellow-gold sphere has a mass of 15.2g when passed in the orange liquid the volume was 43ml

Answers

A yellow-gold sphere has a mass of 15.2 g when passes in the orange liquid with volume 43 mL

Density= mass/volume

Density = 15.2 g/ 43mL

Density = 0.35 g/mL

Question is to find density

a solution containing ethylene glycol and water has a vapor pressure of 7.88 torrtorr at 10 ∘c∘c . pure water has a vapor pressure of 9.21 torrtorr at 10 ∘c∘c . what is the mole fraction of ethylene glycol in the solution?

Answers

Mole fraction of ethylene is = 0.144  

How to find mole fraction ?

As, Given that vapor pressure = 7.88 torr

pure water vapor pressure = 9.21 torr

∆P solvent = (X Solute)(Pº solvent)

∆Psolvent = change in vapor pressure = 9.21 torr - 7.88 torr = 1.33 torr

Xsolute = mole fraction of the solute = ?

Pºsolvent = vapor pressure of the pure solvent = 9.21 torr

1.33 torr = (Xsolute)(9.21)

Xsolute = 1.33 torr/9.21 torr)

Xsolute = 0.144

Hence the mole fraction of ethylene is = 0.144  

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A block of marbles measures 10 x 10 x 10 cm. it weighs 4000g. what is its DENSITY?

D=
Cm=

The density is __g/cm

Answers

Answer:

0.25 g/cm

Explanation:

First, you multiply 10 *10 *10 and you get 1000. Then you divide it by 4000 and since 1000 is 1/4 of 4000 you get 0.25 or 1/4.

Please mark brainliest.

True or false: Properties that cannot be observed are due to the structure of atoms and molecules that can be observed.

Answers

Properties that cannot be observed are due to the structure of atoms and molecules that can be observed.

The correct option is True.

What are molecules?

A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds.

It is true that properties that cannot be observed are due to the structure of  the atoms and molecules of that matter.

Physical properties are often referred to as those properties we can observe with our eyes.

Molecules made up of two or more elements are called compounds Example of molecules includes water, calcium oxide, glucose etc.  

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which material is said to have a high permeability? group of answer choices nickel bismuth soft iron

Answers

Iron l is said to have a high permeability. High coercivity, high retentivity, and high permeability materials make up the permanent magnets. An object made of a substance that has been magnetized and produces its own persistent magnetic field is referred to as a permanent magnet.

In contrast to an electromagnet, which is made of a coil of the wire wrapped around a ferrous core and needs an electric current to create a magnetic field, a permanent magnet's magnetism is "always on" and it creates its own permeability magnetic field. A common example is a refrigerator magnet used to the keep notes on the door of the refrigerator.

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An oxide of iron is found to be 70. 00% iron by mass. Determine the empirical formula for this compound and name it.

Answers

The empirical formula of the compound is Fe2O3 and its name is Iron(III) oxide or ferric oxide.

The oxide of iron has 70% of iron by mass.

This means that in every 100 grams of this oxide,70 grams is of iron and the other 30 grams are of oxygen.

To calculate the empirical formula, we have to first find the number of moles of iron and oxygen by dividing the given mass by their molar mass.

Moles of iron = 70/56 = 1.25 moles

Moles of oxygen = 30/16 = 1.875 moles

Now we need to divide the moles of iron and oxygen by the lowest common number i.e. 1.25

Moles of iron/1.25 = 1.25/1.25 = 1

Moles of oxygen/1.25 = 1.875/1.25 = 1.5

The ratio of iron(Fe): to oxygen(O) comes out to be 1:1.5.

Hence, we should multiply this ratio by 2 to get a whole number.

The ratio of Fe:O comes out to be 2:3.

Thus, the empirical formula of the compound is Fe2O3 and its name is Iron(III) oxide or ferric oxide.

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3.5 g of hydrogen gas reacts with 2.6 g of oxygen gas and produces water. Determine how much water forms.

Answers

Amount of water form will be 2.925 gram

2H2 + O2 -------> 2H2O

4 gram + 32 gram 36 gram

2 moles + 1 mole 2 mole

Moles = Given mass/molar mass

Moles of Oxygen = 2.6 gram/32gram = 0.08 moles

Moles of Hydrogen = 3.5 gram/2 gram = 1.75 moles

Here, we can see that Oxygen moles are less than Hydrogen moles so it is the limiting reagent and it will determine how much water will be formed

The substance that is entirely consumed at the end of the chemical reaction is known as the limiting reagent. This limiting reagent is required for the reaction to proceed since it limits the amount of product that can be produced.

32 gram of O2 produces water = 36 gram

1 gram of O2 produces water = 36/32 = 1.12 gram

2.6 gram of O2 produces water = 1.12 x 2.6 = 2.925 gram

Hence, amount of water form will be 2.925 gram

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you wish to make 0.357m nitric acid from a stock solution of 3.00m nitric acid. how much concentrated acid must you add to obtain a total volume of 150ml of the dilute solution

Answers

17.85 mL of 3.0 M stock solution of nitric acid is needed to make a 150 mL 0.357 M nitric acid.

The dilution of a stock solution can be solved by using the formula below, which indicates that the concentration of the solution changes but the number of moles of the solute remains the same.

(concentration of stock solution)(volume of stock solution) = (concentration of diluted solution)(volume of diluted solution)

Given:

Stock solution: 3.0 M nitric acidDiluted solution: 150 mL of 0.357 M nitric acid

(3.0 M)(volume of stock solution)=(0.357 M)(150 mL)

volume of stock solution = [(0.357 M)(150 mL)] / (3.0 M)

volume of stock solution = 17.85 mL

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PLEASE HELP MEEE
The concentration of a basic solution is determined by which of the following?

Select one:
a. The number of base molecules in solution.
b. The degree of dissociation of base molecules in solution.
c. The rate at which a base solution neutralizes an acid solution.
d. The temperature of the solution.

Answers

The concentration of a basic solution is determined by the degree of dissociation of base molecules in solution (option B).

What is a basic solution?

A basic solution is an aqueous solution containing more OH-ions than H+ions.

In other words, a basic solution can be said to be an aqueous solution with a pH greater than 7, which is the neutral range.

The concentration of a basic solution is a function of the OH- ions in the solution. Therefore, the concentration of a basic solution is determined by the degree of dissociation of base molecules in solution.

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someone can anyone answer this question pleaseeee ?

Which statement about bases is true?


(a) They are all alkalis


(b) They can neutralize acids


(c) They are all soluble


answer this question pleaseeeeeeeeeeeee

Answers

Answer:

either (a) or (b)

investigation of magnetic properties and electronic structure of layered-structure borides alt2b2 (t

Answers

AlT₂B₂ (where T=Fe, Mn, Cr) and AlFe₂₋ₓMnₓB₂ were formed by a technique referred to as arc-melting.

By victimization arc melting to form the quaternary phases AlFe2-xMnxB2 and therefore the ternary phases AlT2B2 (T=Fe, Mn, Cr), these materials are studied and represented.

AlT₂B₂ (where T=Fe, Mn, Cr) and AlFe₂₋ₓMnₓB₂ were formed by a technique referred to as arc-melting.

AlMn₂B₂ and AlCr₂B₂ don't carries with it any form of magnetic ordering.

Nonmagnetic and magnetic attraction cluster in AlFe₂–xMnₓB₂.Ferromagnetism is suppressed by weakening of antibonding T–T interactions.The third phases AlT₂B₂(whereT=Fe, Mn, Cr) and fourth phases AlFe₂–xMnₓB₂ that are shaped by Arc-Melting and powder by X-ray diffraction.

The activity of magnet tells that AlFe₂B₂ could be a ferromagnet with Tₓ=282 K. AlMn₂B₂ and AlCr₂B₂ don't show any form of magnetic ordering within the studied of temperature vary of one.8–400 K.A systematic investigation of solid solutions AlFe₂−xMnxB₂ showed a non-linear modification. The magnetic attraction ordering temperature is step by step small because the content of Mn will increase.Calculation of Quantum chemical and crystal orbital Hamilton population analysis provides a transparent rationalization of the excellence in properties of series of compounds.

Thus, we are able to say that, AlT₂B₂ (where T=Fe, Mn, Cr) and AlFe₂₋ₓMnₓB₂ were ready by a technique referred to as arc-melting.

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Sorry about asking this question again. I figured out the number of protons electrons and neutrons. 92,92 and 146. The mass number and atomic number are 238 and 92. I still can't figure out how to find the charge. The internet says +92, but I don't know how that works.

Answers

If you see the nuclide notation of uranium (u).

The letter in the mid is the symbol of the element.

The number in the bottom left corner is atomic number (Tells you the number of protons)

The number on the upper left corner is the mass number (equal to the mass number ; = the neutrons and protons added together)

At the last, the charge is on the upper right corner, if there is no +ve and -ve symbol then the charge is neutral.

To find the number of neutrons, protons and electron :

1. No. of protons = Atomic Number (Z)

2. No. of neutrons = Mass number (A) - Atomic number(Z)

3. No. of electrons = Atomic number - Charge

To find the charge it is find by the periodic table suppose group 1 alkali metals have +1 charge and in the same way group 16 -2 charge .

Uranium is a radioactive element and hence it is an alpha particle and hence it has a positive charge.

There are many radioactive element who are alpha particles like thorium and plutonium. Beta particles have negative charge.

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vWhich statements explain why rocks weather at different rates? Check all that apply.

Softer, porous, or more permeable rocks weather faster than harder rocks.
Rocks in warmer climates weather faster than rocks in colder climates.
Rocks with minerals that dissolve slowly in water will weather faster than other rocks.
The more water present, the faster the rate of weathering.
Rocks that are more permeable are more resistant to weathering.

Answers

The correct option is A. Softer, porous, or more permeable rocks weather faster than harder rocks.

What are the different types of rocks?

Rocks are of different types such as metamorphic, igneous, and sedimentary rocks.

Rocks that are more pliable, porous, or permeable weather more quickly than tougher rocks. Rocks weather more quickly in hot regions than in chilly ones.

In comparison to other rocks, rocks having minerals that break down slowly in water will weather more quickly. The rate of weathering increases with the amount of water present.

Therefore, The correct option is A. Softer, porous, or more permeable rocks weather faster than harder rocks.

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liquid nitrogen is generally held at a temperature of 77 k. a) liquid nitrogen is generally held at a temperature of °ra. b) liquid nitrogen is generally held at a temperature of °f. c) liquid nitrogen is generally held at a temperature of

Answers

The temperature of liquid nitrogen (LN), an inert cryogenic fluid, is 196 °C (320 °F). To drop the temperature of the concrete as much as is possible without causing it to freeze, LN is directly injected by lances into the batch water storage tank, the aggregate, or the mixer.

What is Cryopreservation ?

Cryopreservation is the process of preserving live cells, tissues, and other biological samples by placing them in a deep freezer at extremely low temperatures. The sample is typically stored at 196°C or lower. All of a cell's biological processes come to an end at such low temperatures, and the cell dies.

Cells and tissues intended for transplantation are frequently stored via cryopreservation. A extremely stable ultra-low temperature environment is provided by liquid nitrogen. It is therefore employed for long-term storage.

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Which of the following is a property of both acids and bases?

Answers

Most strong acids and bases are both corrosive in nature. They tend to corrode or rust metals. Both, acids and bases change the colour of litmus paper. https://www.toppr.com/guides/chemistry/acids-bases-and-salts/similarity-between-acids-and-bases/#Similarities_between_Acids_and_Bases
I hope it helps:)

A claim supported by evidence.

Answers

Reasoning is the correct answer.

Question 1
Convert 4136mg to g
4136mg x

Answers

Each gram is 1000 mg so the answer to this is 4.136 grams. Round the decimal if needed

Answer: 4.136 g

Explanation:

1000 mg=1 g

4136 mg * 1 g/1000 mg=

4136*1/1000=

4136/1000=4.136 g

Paint is a type of mixture called a(n) ____________ because it is a
heterogeneous mixture with large particles that will settle to the
bottom if undisturbed for a long period of time.

Answers

Suspension mixture is the correct answer

an excess of o2 reacted with 3.82 g of fe. what is the percent yield if 4.77 g of fe2o3 are isolated?

Answers

Percentage yield = 87.3%

How to find percentage yield ?

As ,the reaction is :

4Fe + 3O2 →2Fe2O3

Molar mass of Fe = 55.8 g

Molar mass of Fe2O3= 159.6 g

According to the balanced equation :

4×55.8 g of Fe produce 2×159.6 g of Fe2O33.82 g of Fe produce X g of Fe2O3 X = ( 2×159.68×3.82)/( 4×55.8) =             5.46 g

This is the theoretical mass obtained .

Actual mass is 4.77

So, % yield is = (actual /theoretical )/100 =( 4.77/5.46 )/100 = 87.3%

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in metal IE 1 < IE 2 < IE 3. why? ​

Answers

Answer:

Explanation:

in metal IE 1 < IE 2 < IE 3. why

ibuprofen c13h18o2 that is manufactured in michigan contains 75.69% by mass carbon, 8.80% hydrogen, and 15.51% oxygen. if you buy some ibuprofen for a headache while you are on vacation in germany, how do you know that it has the same percentage composition as the ibuprofen you buy at home?

Answers

Law of definite composition: As long as something has the same formula, its mass will be the same.

According to the Law of Definite Proportions, a chemical compound will always include the same weight proportions of each element, regardless of the quantity or source. For instance, 21.5 grammes of carbon and 28.5 grammes of oxygen make up a 50-gram sample of carbon monoxide.

What is Ibuprofen ?

Ibuprofen is a medication used to treat pain, fever, and inflammation, and is a member of the nonsteroidal anti-inflammatory drug (NSAID) family. This includes menstruation pain, migraines, and rheumatoid arthritis. The patent ductus arteriosus of a premature newborn can also be sealed with this technique.

Ibuprofen is a painkiller that can be bought over-the-counter without a prescription. It is a member of the group of drugs referred to as non-steroidal anti-inflammatory drugs.

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a 1.00-l solution contains 2.50×10-4 m cu(no3)2 and 1.20×10-3 m ethylenediamine (en). the kf for cu(en)22 is 1.00 × 1020. chegg

Answers

The concentration of copper in the solution is

[tex]5.1 \times 10^{18} \: M.[/tex]

The volume of the solution = 1.00 L

[tex]Moles \: of \:Cu(NO_{3}) _{2} = 2.50 \times 10 {}^{ - 4} [/tex]

[tex]Moles \: of \: Ethylenediamine = 1.20 \times 10.3[/tex]

[tex]k _{f} = 1.00 \times 10^{20} [/tex]

Overall balanced equation of reaction is,

[tex]Cu^{2 + }(aq) \: + 2en \: (aq)→ Cu(en) ^{2 + }_{2}(aq)[/tex]

[tex]Moles \: of \:Cu(NO_{3}) _{2} =0.00025 \: mol[/tex]

Mole ratio for,

[tex]Moles \: of\:Cu(NO_{3}) _{2}: en[/tex]

[tex]2: 1[/tex]

[tex]Moles \: of \: en = 0.000250 \times 2[/tex]

[tex] = 0.00050 \: moles[/tex]

Remained moles of en are= (0.00120-0.000500)

[tex] = 0.000700 \: moles[/tex]

The concentration of copper in the solution is,

[tex]k_{f} = \frac{Cu(en)^{2 + }_{2} }{Cu^{2+}en^{2} }[/tex]

[tex]1.00 \times 10 ^{20} = \frac{0.000250}{(Cu )^{2 +} \times (0.000700)^{2 + } }[/tex]

[tex] = 5.1 \times 10^{18} \: M.[/tex]

Therefore, the concentration of copper in the solution is

[tex]5.1 \times 10^{18} \: M.[/tex]

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calculate what volume of 0.3 mol dm-3 oxylic acid contains 22.5 grams of oxylic acid ((COOH)2) ​

Answers

The volume of 0.3 M oxalic acid(C2H4O2) solution containing 22.5 grams of oxalic acid is 833.3 ml.

The molarity(M) of a solution can be expressed by the following formula,

Molarity(M) = Mass of solute/Molar mass of solute x 1000/Volume of the solution

We are given that, the molarity of a solution containing 22.5 grams of oxalic acid(Molar mass= 90 g) is 0.3 M.

Putting these values in the given formula, we can calculate the volume of the solution

0.3 = 22.5/90 x 1000/V

V = 22.5/90 x 1000/0.3

V = 833.3 ml.

Thus, The volume of 0.3 M oxalic acid(C2H4O2) solution containing 22.5 grams of oxalic acid is 833.3 ml.

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Titanium (Ti, #22) atoms bond with Oxygen (O, #8) atoms. What type of bond will hold them together? (1 pt)
*
1 point
ionic
covalent
metal
intermolecular (hydrogen, dipole, etc.)

Answers

Titanium (Ti,) atoms bond with Oxygen (O,) atoms. covalent type of bond  hold them together.

What is covalent bond?

An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond.

When atoms share electrons, a permanent equilibrium of the attractive and repulsive forces between them is known as covalent bonding.

These electron pairs are referred to as shared pairs or bonding pairs.

Thus ,Titanium (Ti,) atoms bond with Oxygen (O,) atoms. covalent type of bond  hold them together.

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You have a substance with a half-life of 9 days. How much of it will be left after 36 days?

Answers

Answer:

A half life is the amount of time it takes for half of a mass of a given radioactive element to decay to something else. 36 days is 4 1/2 life cycles, so by running  1/2*4  , we get how much of the original substance would be left. That would be 1/16 of the original substance left.

Explanation:

Of course, this is not always perfect, and can vary. In addition, if less than 16 atoms of the original substance are present, there is instead a  1/16∗a  chance of at least one remaining.

The amount of substance left after 39 days will be 1/16th of the original amount.

What is the half-life of a radioactive element?

The half-life period of the radioactive material can be defined as the time required to reduce its actual amount to half after disintegration. The half-life period of a radioactive substance is independent of the initial amount of the substance.

Consider that N₀ is the initial amount of the substance

Consider that 'n' is the number of half-lives of given substance.

The time for which substance decay, t = 36 days

Half-life of substance (t½) =  9 days

t = n ×t½

36 = n × 9

n = 4 days

Assume that N is the amount of the substance after decay for 39 days.

N ×2⁴ = N₀

N × 16 = N₀

N = N₀/16

Therefore, one-sixteenth of the initial amount of the substance will be left after 39 days.

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Blood coming from all parts of the body is received by the (1)_____ of the heart by the way u the blood vessel called (2)____ Contraction of the right atrium sends blood to the (3)_____ this point, the (4)______ valves are open. While the valves are open. Contraction of the right ventricle forces blood to the (5)______ for oxygenation by the way of the (6)______ At this point, the (7)______ (8)______________ valves are closed to prevent back flow of the blood in the right atrium. From the lungs, oxygenated blood goes back to the (8)_____. of the heart via the blood vessels At this point, the Contraction of the left atrium forces blood to the (10)______. are open. Contraction of the left ventricle pumps blood to (12)______ by way of the (13)_______ called(9)_____ (11)_____ the largest artery. At this point, the (14)_____$ valves are open while the (15)______ revent the backflow of blood in the left atrium. are closed to prevent the backflow of blood in the left atrium SCIENCE ​

Answers

1. The right atrium 2. veins 3. lungs 4. heart valves. 5. pulmonary artery   6. Lungs 7. pulmonic valves 8. left atrium.

Circulation is the process by which your heart continuously pumps around five liters (eight pints) of blood throughout our body. our cardiovascular system is made up of our heart, blood, and blood arteries (or heart and circulatory system). Because the majority of the oxygen has been used up by the body and brain, the right side of the heart receives blood that is deficient in oxygen. our lungs then take in a new supply of oxygen as a result of this being pumped to them. In order to be pumped back out to the brain and the rest of our body, the blood then travels back to the left side of the heart.

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pls help meDrag the tiles to the boxes to form correct pairs.Consider functions f and g. What does this fortune mean ( Impose not a burden on others which you cannot bear yourself?)Paragraph Please I am good at math spanish and science if you need help come to me i am the one for you to help Find the other endpoint of the segment with a midpoint of (-6, 4) and endpoint of (4, 8). Show your own work In 2005 tokyo had an estimated population of 34,450,000 people while mexico city had an estimated population of 18,066,000 people. about how many more people resided in tokyo? Which word from the article means "average or uninspired"?abberF jumbled (paragraph 3)G mediocre (paragraph 4)H bleary-eyed (paragraph 7)J pervasive (paragraph 9) Solve the following compound inequality. x4x12x+2 Submit your answer by dragging the movable blue points on the number line. when edna visits adele ratignolle during her friends difficult childbirth, what does adele tell her just before she leaves? after a lifetime of feeling that he did not resemble his father, what similarities does amir discover as he reflects on rahim khans news? what is significant about these similarities? The field that involves the study of cells and how they interact with other cells is termed. hydrogen fuel can be produced from methane or by electrolysis of water. as of 2020, the majority of hydrogen (95%) is produced from fossil fuels by steam reforming or partial oxidation of methane and coal gasification with only a small quantity by other routes such as biomass gasification or electrolysis of water. are important to business decision makers because they provide ways to settle conflicts between countries and resolve disagreements more easily than if one government worked directly with another. let f (x) = 4x-9. write a function g whose graph is a translation 1 unit right of the graph of f A large jar contains an unknown number of red gumballs and 145 green gumballs. As part of a seventh-grade class project the teacher asks Carlos to estimate the total number of gumballs in the jar using a sample. Carlos draws a sample of 55 gumballs, of which 11 are red and 44 are green. Use Carlos' sample to estimate the number of gumballs in the jar. on a phylogenetic tree, each node (branchpoint) represents a divergence event, and the length of the branches represents the number of molecular changes that have taken place between the nodes. A uniform, rectangular block made of steel has dimensions 1. 00 cm2. 00 cm3. 00 cm. It is placed on a wooden board, and then the board is tilted until the block begins to slide down the board. Which face of the block should be in contact with the board, so that it begins to slide at the shallowest angle?. PLEASE HELP WITH THIS MATH At the sewing store, Gina bought a bag of mixed buttons. The bag included 30 buttons, of which 70% were large. How many large buttons did Gina get? If (2x+3y)(x+5y) or xy, then which of the following is true?a. x/y = (5k-3/2-k) c. x = y(5k-3/2-k)b. x:y = (5k-3):2-k d. all are correct atkins company collected $1,750 as payment for the amount owed by a customer from services provided the prior month on credit. how does this transaction affect the accounting equation for atkins?