help please !! did i do it right?

Answer: Last one( 4 pairs of valence electrons)

Explanation:

The best thing Ka can do next to determine the objectivity of the source is conduct an internet search for cardiac problems + omega-3 fats. Thus option C is correct.

Cardiac problems are defined as the problems that occurs in heart and blood vassals of heart.

The common cardiac problems are

A significant family of polyunsaturated fats is the omega-3 family.

Thus, the best thing Ka can do next to determine the objectivity of the source is conduct an internet search for cardiac problems + omega-3 fats. Thus option C is correct.  

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Answer:

it is A.

Explanation:

determine whether the evidence cited reflects more than one side

Answer:−27∘C, 19.4 g of molecular oxygen exerts a pressure of 1820 mmHg in a 5.12 L cylinder.

Explanation:The molar mass of O2

is 32.00 g/mol. So, the number of mol (n) of O2 present in 19.4 g of mass is calculated as shown below:

n =19.4g

32.00g/mol

=0.60625mol

For ferromagnesian silicate minerals like olivine and biotite, oxidation of iron plays a significant role in the chemical weathering process.

When water absorbs the minerals in rocks, it causes chemical weathering, which produces new chemicals. Hydrolysis is another name for this. An illustration is when water enters the region around granite. Inside the rock, feldspar crystals undergo chemical reactions that results in clay minerals.

Solution, carbonated, hydration, oxidation, and reduction are significant chemical weathering reactions. Via chemical reactions involving oxygen, surface and/or soil water, and various acids, such processes operate on the rocks to break them down, dissolve them, or reduce then to a fine clastic form.

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Fe(ii) and Fe(iii) ions differ by E) 1 electron.

Ferric is the term used for an iron atom that has lost three electrons from the valence shell, on the other hand, ferrous is the term used for an iron atom that has lost two electrons from the valence shell.

As one shares two electrons while the other shares three electrons therefore they differ by one electron.

Fe(iii) is more stable due to its half-filled subshell while Fe(ii) is unstable in nature. There is a partially-filled d orbital in Fe(ii) resulting in its instability as half-filled and completely filled orbitals are more stable as compared to the partially filled orbitals.

Although a part of your question is missing, you might be referring to this question:

Iron forms compounds as both a ferrous Fe(II) and a ferric Fe(III) ion. These two ions differ by:

A) 1 proton

B) 1 neutron

C) 2 protons

D) 2 electrons

E) 1 electron

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About 40% of a total blood calcium is linked to plasma proteins, predominantly albumin, with a calcium ion concentration of 0.00891765 eq/l..

For overall health, calcium is crucial. Calcium is utilized in some form by almost all of our body's cells. Our bodies need calcium in the neurological system, muscles, heart, and bones, among other places. In addition to supporting our bodies, our bones also store calcium.

Adults typically have plasma calcium values of 2.5 mmol/L (or 5 mEq/L, 10 mg/dL1) or higher. Different amounts of protein-bound, complexed, or ionized calcium can be found in plasma. About 45% of a serum calcium is incorporated into plasma proteins, primarily albumin.

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Modern continents hold clues to their distant past. Evidence from fossils, glaciers and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed. Some life "rode" on diverging plates, became isolated, and evolved into new species.

Earthquakes, mountain building and volcanic activity occur mostly at the boundaries of the moving plates. Only shallow earthquakes occur where plates diverge at mid-ocean ridges, whereas earthquakes extend to a great depth where plates converge at subduction zones. Magma generation, igneous intrusions, metamorphism, volcanic action, earthquakes, faulting, and folding are usually the result of plate tectonic activity. The earth's crust is divided into six large pieces, and about twenty smaller pieces, by deep fault systems.

HBr is an acid and so its molecules react with water molecules to form H3O+ and Br− ions that provide conductivity to the solution.

Any substance that produces a sour taste in water solution, turns blue litmus paper red, reacts with some metals to release hydrogen, combines with bases to form salts, and stimulates chemical processes is considered an acid. Pure water is neutral; it is neither acidic nor basic. That occurs when the hydroniums and hydroxyls are out of balance. The chemical compound benzene has the molecular formula C6H6 and is classified as an organic chemical. The benzene molecule is made up of six carbon atoms connected in a planar ring, one hydrogen atom bonded to each. The chemical formula for benzoic acid, an organic substance, is C6H5COOH. It consists of a benzene ring and a carboxyl group. As a result, benzoic acid is described as carboxylic acid.

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Ca(OH)2+2CH3COOH → Ca(CH3COO)2+2H20. Option D.

Calcium acetate is obtained by reacting acetic acid and calcium hydroxide, and dry distillation of acetone and calcium carbonate. Acetic acid is the systematic name for acetic acid CH3COOH. The chemical formula for calcium hydroxide is CaOH2. Balanced word equation 2 moles of acetic acid react with 1 mole of calcium hydroxide to form 1 mole of calcium acetate and 2 moles of water.

When acetic acid reacts with calcium hydroxide calcium acetate and water are formed. Ammonium hydroxide reacts with sulfuric acid to produce ammonium sulfate and water. Acetic acid reacts with sodium bicarbonate to produce carbon dioxide. When carbon dioxide is passed through lime water, the lime water becomes cloudy. The milky appearance of limewater is due to the formation of solid calcium carbonate CaCO3.

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A mixture is a combination of two or more substances in which no chemical bonds or reactions occur.

Compounds contain atoms of different elements chemically bonded in fixed ratios. A mixture is a combination of two or more substances in which no chemical bonds or reactions occur. Compounds contain different elements in fixed ratios, arranged in a way defined by chemical bonds.

The chemical composition of the compound is always fixed. A mixture can have a variable composition of constituents. A mixture is either homogeneous or heterogeneous in nature. The components of a compound can only be separated by chemical or electrochemical methods such as extraction. A mixture is formed when two or more different substances are physically combined and can be separated into their original substances.

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The event is South American independence. Option D.

By 1820, royalist Peru was an isolated outpost of Spanish influence. San Martin liberated Chile and Argentina to the south while Simon Bolivar and Antonio Jose de Sucre liberated Ecuador Colombia, and Venezuela to the north leaving only Peru and present-day Bolivia under Spanish control.

Simon Bolivar wrote two of his political treatises. The Manifesto de Cartagena Declaration of Cartagena and Carta de Jamaica Letters from Jamaica told the people of South America that Spain urged them to rebel against their colonial rule. Simon Bolivar is a Creole who grew up in a wealthy family. Bolivar devoted his time and effort to fight for Venezuela's independence from Spain. Bolivar was inspired by the Enlightenment ideas of John Locke.

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The idea is that life can arise from something non-living. Option A.

Spontaneous generation is a hypothetical process by which living things evolve from inanimate objects. Also, an archaic theory used this process to explain the origin of life. Other common examples of spontaneous generation were fleas that generate dust maggots that develop from rotting meat, and bread or wheat placed in a dark corner that generates rats. Life is said to have originated from non-living things.

It was a long-standing belief dating back to Aristotle and the ancient Greeks. For centuries, it was believed that living things naturally arise from inanimate objects. This idea known as spontaneous generation is now known to be false. The theory of spontaneous generation was coherently put together by Aristotle.

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A number that tells how many molecules there are of a certain compound is called a(n) coefficient.

A subscript is a small-sized variety on the bottom right of the image. It refers to the number of atoms of the detail. If the subscript seems on the lowest left of the image, it offers the detail's atomic range.

The chemical formulation which represents the actual range of atoms of every detail present in a molecule is called molecular formula.

The coefficients suggest the range of each substance worried inside the response and may be changed so that it will stabilize the equation. The coefficients deliver the number of molecules worried inside the response.

In the example reaction,  molecules of hydrogen react with one molecule of oxygen and convey molecules of water. second: the coefficients deliver the range of moles of every substance concerned within the reaction.

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The amount of concentrated solution required would be 0.855 moles.

As per the formula,

Molarity = [tex]\frac{moles of solute}{litres of solution}[/tex]

Given, Molarity = 1.90 M

The Volume of solution in litres = 450/1000 L

                                              = 0.45 L

∴ 1.90 = [tex]\frac{moles of solute}{0.45}[/tex]

  Moles of solute = 0.855 moles

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If the cells do not multiply by mitosis then the wound will not heal.

There are two kinds of cell division and these are mitosis and meiosis. We have to note that mitosis occurs at the body cells and the exact number of chromosomes in the parent cell is transferred to the daughter cells.

Meiosis occurs in the gamete cells and each of the parent cells would only contribute half of the maximum number of the chromosomes that they contain.

We know that when we have a cut, the cells around the area of the cut would begin to multiply by the process of mitosis helping the wound to heal.

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The percentage composition of each element in the compound can be determined from the molar ratio of elements or from the measured masses of each element in a compound. So both ways are accurate and exact regarding the respective calculations of percentages.

In general, in a compound, the mass percentage of each element can be determined by calculating the mass of the element. In this way, we can see that both quantities are interrelated to each other. So, is a user does the exact calculation then there are high chances of accuracy of both methods.

In Chemistry, the calculations of mass percentage as well as the calculation of the mass of the chemical compound has their own significance as both are applicable to various fields of Chemistry. So, a comparison between their accuracies always leads to a neutral answer as both methods are exact and accurate.

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The question requires us to calculate the mass, in grams, contained in 5.26 x 10^-4 mol of HC2H3O2.

To solve this question, first we need to calculate the molar mass of the compound, considering the number of atoms of each element, and then relate the value obtained with the number of moles given (5.26 x 10^-4 mol).

First, to calculate the molar mass of the compound, let's consider the following atomic masses:

atomic mass of C = 12.01 u

atomic mass of H = 1.007 u

atomic mass of O = 15.99 u

Next, we calculate the molar mass. To do that, we need to consider the number of atoms of each element: according to the chemical formula, there are 2 atoms of C, 4 atoms of H and 2 atoms of O:

molar mass (C2H4O2) = (2 * 12.01) + (4 * 1.007) + (2 * 15.99) = 60.03 g/mol

Now, we know that there are 60.03 g for each mol of the compound. With that information, we can estabilish the following relation to calculate the mass contained in 5.26 x 10^-4 mol of the compound:

1 mol --------------------- 60.03 g

5.26 x 10^-4 mol ----- x

Solving for x, we have:

Therefore, there are 0.03158 g of HC2H3O2 in 5.26 x 10^-4 mol of this compound.

If the final pressure of water vapor was 0.875 atm and the temperature is 400K, then 6.66 moles of H₂O was produced if we assume that the reaction went to completion in a 250L engine.

It is given to us that the pressure of water vapor is 0.875 atm and the temperature is 400K and the volume of the engine is 250L. Then, the number of moles of water could be found by the following formula,

PV = nRT

Here, R refers to the Universal Gas constant and n refers to the number of moles. Thus, by substituting the values we get the number of moles of H₂O as,

0.875x250 = nx0.0821x400

218.75 = 32.84n

n = 218.75/32.84

n = 6.66

Therefore, the number of moles of water molecules is 6.6

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yes that is correct

...........

C) Plant roots growing through concrete and splitting it.

The normal pH of the body fluids of 7.4 is considered slightly basic in nature.

Generally, the pH of Blood ranges from 7.35-7.45 which is slightly basic or alkaline. The pH scale is a great indicator for understanding the given substance is acidic or alkaline or neutral.

The scale ranges form 1 to 14 and the divisions from 1 to 6 is considered acidic, 7 is considered neutral and 8 to 14 is considered alkaline. Since the scale of body fluids falls under 7.4, it is slightly basic.

But comparing the pH of blood with the pH of acid in the stomach, the pH of stomach is more acidic and ranges from 1.5-3.5 in the pH scale.

Therefore, the pH of blood is considered to be slightly alkaline.

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 Three significant figures in 2.31 and three in 0.790 2.31/0.790 = 2.92

  .  

2.) (2.08 × 10³) × (3.11 × 10²) = 6.468 800 000 × 10⁵  

      Three significant figures in 2.08 and three in 3.11.

Significant figures are the variety of digits in a value, frequently a dimension, that contribute to the degree of accuracy of the value. We begin counting widespread figures at the primary non-0 digit.

If a number expressing the end result of a dimension (e.g., duration, pressure, volume, or mass) has more digits than the quantity of digits allowed by way of the measurement decision, then most effective as many digits as allowed by means of the measurement decision are dependable, and so best those can be massive figures.

5 rules for significant figures include:-

* All non-zero numbers ARE substantial.

* Zeros among two non-0 digits ARE great.

* Leading zeros are not giant.

* Trailing zeros to the proper of the decimal are widespread.

* Trailing zeros in an entire quantity with the decimal proven are enormous.

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Answer:

Explanation:

Limitation of Lewis concept: -This fails to explain the cause of covalent bond formation and the nature of attractive force between the adjacent atoms in molecules likeH2,Cl2. -Fails to explain the geometry of a molecule. -It could not explain the release of energy during formation of covalent bonds.

Specific heat capacity  is the amount of heat required to raise the temperature by 1 degree Celsius. The total amount of heat absorbed by the water is 4079.4 J

Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have.

Mathematically,

Enthalpy=mass of ×specific heat capacity ×Change in temperature.

Initial temperature of water (T₁) = 25 °C

Final temperature (T₂) = 40 °C

Change in temperature ΔT= T₂ – T₁

                                                =40 – 25

                                                 =15 °C

Mass of water (M) = 65 g

Change in temperature (ΔT) = 15 °C

Specific heat capacity of water (C) = 4.184 J/gºC

Heat absorbed (Q) = MCΔT

                                = 65 × 4.184 × 15

                             = 4079.4 J

Therefore, the amount of heat absorbed by the water to melt is 4079.4 J

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Mgcl2 is the molecule

What is molecule?

A molecule is two or more and atoms connected by the  chemical bonds are

which form the smallest unit of a real substance that retains the  composition and properties of that substance.

Molecules form the basis of chemistry.

Magnesium Chloride or the  Magnesium Dichloride or Chloromagnesite is a chemical compound with the molecular formula is  MgCl2. Magnesium is  Chloride is an ionic salt that is highly soluble in water.

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Only two elements on the periodic table are elements at room temperature. They are mercury (a metal) and bromine (a halogen).

Four other elements are liquids slightly warmer than room temperature. They are francium, cesium, gallium, and rubidium (all metals).

The reason these elements are liquids has to do with how tightly bound their electrons are to the atomic nucleus. Basically, the atoms don't share their electrons with nearby atoms, so it is easy to separate them from solids into liquids.

Answer:

0.278 meter per second (rounded)

Explanation:

1÷3.6

---------------------------------

1 km/h = 0.277777778 m/s

A new chemical waste in the lab must be started when the contents of the current container are a couple of inches below the brim of the container.

In a lab, waste chemicals are produced abundantly and are stored in a chemical waste container to avoid undesired events such as contamination, explosion, or eruption of fire.

A standard lab follows the proper guidelines and establishes strict rules and takes all the necessary measures to make sure safety of all the workers and materials.

However, the chemical waste container must be replaced with a new container when the level of chemical waste is a couple of inches below the brim.

This is because the chemical reaction keeps taking place inside the container over time which can expand the volume of the waste materials. Therefore, some space should be left in the container to avoid an overflow of hazardous material and explosions.

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The concentration of the iron III bromide solution is 1.13 M.

We know that the concertation is defined as the ratio of the number of moles to the volume of the solution. In this case, the balanced reaction equation that we need to work with have been shown in the image that is attached to the question.

Number of moles of iron (III) oxalate =  2.97 g/376 g/mol = 7.9 * 10^-3 moles

From the reaction equation;

2 moles of the iron III bromide yields 1 mole of the iron (III) oxalate

x moles of the  iron III bromide yields 7.9 * 10^-3 moles of the iron (III) oxalate

x = 2 moles  * 7.9 * 10^-3 moles/ 1 mole

= 0.0158 moles

Given that;

Number of  moles = concentration/ volume

concentration = Number of  moles/ volume

= 0.0158 moles/14 * 10^-3

= 1.13 M

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