a student heats a sample of hydrate once, and the mass of the sample and the evaporating dish is 17.296 g. after a second heating cycle, the mass of the sample and the dish is 14.025 g. the student stops the heat/cool/weigh cycle after the second time. if the original mass of the evaporating dish and the hydrate was 29.936 g, and the mass of the evaporating dish alone was 1.61 g, what is the mass of water removed from the sample by heating? provide your response to three digits after the decimal.

The molarity of a solution of nitric acid if 0.216g of barium hydroxide is 0.1715  M.

Molarity (M) is the quantity of a substance in a sure volume of answer. Molarity is defined as the moles of a solute according to liters of a solution. Molarity is likewise referred to as the molar attention of an answer.

Given;

mass = 0.216

volume = 20 ml = 0.02L

The molar mass of nitric acid = 63

  moles = mass/molar mass

              = 0.216/63

              = 3.43

              = 0.00343

Molarity = moles/volume

              = 0.00343/0.02

               = 0.1715

Molar concentration is the degree of the concentration of a chemical species, especially of a solute in a solution, in terms of the amount of substance in keeping with the unit volume of the solution. In chemistry, the most usually used unit for molarity is the number of moles in step with liter, having the unit image mol/L or mol/dm³ in SI unit.

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Answer:

The overall redox reaction is balanced when the number of electrons lost by the reductant equals the number of electrons gained by the oxidant. An electric current is produced from the flow of electrons from the reductant to the oxidant.

Explanation:

N/A

Answer:

Solids have a well defined shape and this -the shape- is "independent" of the space, in other words if we take a rock (solid) its shape would be the same (kind of) no matter in which container we put it. The volume is also well defined and easy to measure. We can use a "ruler" to measure the rock. On the other hand, liquids and gases shape will depend on the container (solid container) or their shape will very similar to the solid body containing them; however liquids are more sensible to mechanical forces as Gravity and therefore their shape will result in a combination of the container and the force of gravity (for example), hence if we put water in a cylindrical container but not enough to fully filled then the shape of the liquid will be cylindrical but because gravity it will occupy just the bottom of the container, while the gases are going to expand until cover the whole space of the container.

In short:

Solids: Well defined shape and volume "independent" of the environment

Liquids: Shape dependable of the container, hence not well defined. well define Volume

Gases: Shape and volume dependable of the container.

Cs₂SO₄(aq) + Ba(ClO4)₂(aq) → 2 CsClO₄(aq) + BaSO₄(s) is the balanced equation for the reaction of aqueous cesium sulfate and aqueous barium perchlorate.

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The mass of 1000 coulombs of electric charge are 6.241 ×10^21 C.

What do you mean by electric charge?

Electric charge, a fundamental characteristic of matter possessed by some elementary particles, controls how an electric or magnetic field affects the particles. Positive or negative electric charge exists in distinct natural units and cannot be manufactured or destroyed. Positive and negative charges are the two main categories of electric charges. When two things are reasonably close to one another and one sort of charge is present in excess, they repel one another. When they are relatively close to each other, two things with surplus opposing charges—one positively charged and the other negatively charged—attract to one another.

1 Coulomb of electric charge = 6.241 × 10^18 C.

So, 1000 coulomb of electric charge = (6.241×10^18) ×10^3

⇒6.241×10^21 C.

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The indicated covalent bond is a sigma(single) bond which is a strong bond and cannot easily break.

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted to two nuclei. A covalent bond is formed when the electronegativity difference between two atoms is too small for electron transfer to form an ion.

Following are the types of covalent bonds:

CH₃NH₂ is classified as a covalent compound with the IUPAC name methylamine. Each molecule contains one carbon atom, five hydrogen atoms, and one nitrogen atom, all held together by a single covalent bond.

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The temperature is increased to 380. 5 k is 67.68ml.

A hypothetical gas made up of molecules that abide by the following conditions is referred to as an ideal gas: Molecular interactions in ideal gases are neutral. The molecules of an ideal gas wouldn't interact with each other or the container walls other than when they collided in an elastic collision.

Formula

V / T = V₁ / T₁

Given,

V = 56.05 mL

T = 315.1 degrees Kelvin

V₁ = x

T₁ = 380.5  degrees Kelvin

Solution

56.05/315.1 = x/380.5                

0.1779 = x / 380.5  (multiply both sides by 380.5)                      

0.1779 × 380.5 = 380.5x/380.5

x = 67.68 ml

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The mass of metal in the compound is 1.504 pounds.

A metal is a substance that, when newly prepared, polished, or fractured, exhibits a lustrous appearance and fairly good electrical and thermal conductivity. Metals are often malleable and ductile (can be formed into wires) (they can be hammered into thin sheets). The metallic link formed by the atoms or molecules of the metal gives rise to these characteristics.

An alloy, like stainless steel, a chemical element, like iron, or a molecular molecule, like polymeric sulfur nitride, are all examples of metals.

Given that;

A scientist measures the mass of a metal to be 682 grams

1000 grams =  1Kg

1kg = 2.2 pounds

hence ;

682 grams will be equal to 0.682 kilograms.

and 0.682 kilograms = 1.504 Pounds

so,

the mass of metal in the compound is 1.504 pounds.

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The pH at the equivalence point will be 3.7.

Methyl orange is a commonly used pH indicator in titrations because the color change is readily noticeable. It is often used for acid titrations because it changes color at weakly acidic pH. Methyl orange turns red in acidic media and yellow in basic media. Methyl orange is not a natural indicator. It is actually synthesized from sodium nitrate, dimethylaniline, and sulfanilic acid. A diazonium salt is an organic compound having functional groups conforming to the generalized form R−N⁺2X⁻, where R represents any organic group such as alkyl or aryl.

Methyl Orange changes from a basic color to an acidic color during strong acid/weak base titrations, making it a useful chemical indicator. In acidic or basic media, methyl orange exhibits red and yellow colors. During the titration, the solution initially appears yellow due to the high pH.

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First part-

Aluminum Ion Charge- +3

fluoride charge- -1

hydrogen charge- +1

chloride ion- -1

silicon ion- 4+ / +4

sulfide ion- -2 / 2-

cesium ion- 1+ / +1

gallium ion- 3+/ +3

oxide ion- 2-/-2

potassium ion- 1+/ +1

carbide ion- 2-/ -2

bromide ion- -1

barium ion- 2+/ +2

Second part- strontium- 2+/ +2

sulfur- -2

phosphorous- 3-/-3

bromine- -1/1-

Two atoms, in this case oxygen and hydrogen, share electrons to form covalent bonds. Option a is correct as a result.

The exchange of electrons between atoms forms a covalent connection. This kind of bond happens when two atoms of the same element, or between adjacent elements in the periodic table, come together.

Individual H₂O molecules are held together by powerful interactions between the hydrogen and oxygen atoms, known as covalent bonds.

Each end of the V-shaped H₂O molecule adopts a slightly different charge because oxygen and hydrogen draw the shared electrons from each other in different ways.

Covalent bonds are thus created when hydrogen and oxygen atoms in separate H₂O molecules share electrons. The three atoms in a water molecule can thus remain connected thanks to a covalent connection. Therefore, choice A is right.

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0.0163 mol of sodium hydroxide needed to be added 0.500 l of 0.267 m hydrocyanic acid solution to prepare a buffer with a pH of 10.400.

Ka HCN= 4x[tex]10^{-10}[/tex]

Pka HCN = 9.4

pH = Pka + log [tex]\frac{A}{HA}[/tex]

10.400 = 9.4 + log        [tex]\frac{A}{HA}[/tex]

log        [tex]\frac{A}{HA}[/tex] = 1

       [tex]\frac{A}{HA}[/tex] = 10

let W be the mole of NaOH be used  

NaOH =  [tex]\frac{w mol . 1000ml}{500 .1L}[/tex] = 5 w mol

NaOH + HCN → NaCN +H2O

thus 5 mole of NaOH combines with 5 mole of HCN to for 5 mole of NaCN

[tex]A^{-}[/tex] = (0.1 +5w) M

HA = 0.267 -5w) M

       [tex]\frac{A}{HA}[/tex] = 0.1 + 5w/ 0.1 -5w

10 = 0.1 +5w ? 0.1 - 5w

0.1 +5 w = 10 (0.1- 5w)

0.9 = 55w

w = 0.0163 mol

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B. To prepare 225.0 mL of 1.33 M HCl, measure 49.89 mL of the stock solution and dilute with water to 225 mL

C. The volume strontium hydroxide, Sr(OH)₂ required is 11.91 mL

B. How do I prepare 225.0 mL of 1.33 M HCl?

To prepare 225.0 mL of 1.33 M HCl, we must obtain the volume of the stock solution of HCl needed. This can be obtained as follow:

M₁V₁ = M₂V₂

6× V₁ = 1.33 × 225

6 × V₁ = 299.25

Divide both side by 6

V₁ = 299.25 / 6

V₁ = 49.89 mL

Thus, to prepare 225.0 mL of 1.33 M HCl, measure 49.89 mL of the stock solution of HCl, put it in a 225 mL volumetry flask and dilute with water to obtain the desired volume (i.e 225 mL)

C. How do I determine the volume of strontium hydroxide, Sr(OH)₂ required?

We'll begin by writing the balanced equation for the reaction

2HCl + Sr(OH)₂ —> SrCl₂ + 2H₂O

The volume of strontium hydroxide, Sr(OH)₂ can be obtained as follow:

MaVa / MbVb = nA / nB

(0.07942 × 75) / (0.25 × Vb) = 2

5.9565 / (0.25 × Vb) = 2

Cross multiply

2 × 0.25 × Vb = 5.9565

0.5 × Vb = 5.9565

Divide both side by 0.5

Vb = 5.9565 / 0.5

Vb = 11.91 mL

Thus, the volume of the strontium hydroxide, Sr(OH)₂ required is 11.91 mL

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The scenario in which the change in pressure and the temperature is occurred but volume does not change is when pressure and temperature is doubled or tripled.

The formula for combined gas law is given as

(P₁×V₁/T₁)=(P₂×V₂/T₂)

If we change the P₂ and T₂ by a factor of 2, then the combined gas law looks like

(P₁×V₁/T₁)=(2P₂×V₂/2T₂)

The factor 2 is cancelled out from numerator and denominator. Hence, the equation will be

(P₁×V₁/T₁)=(P₂×V₂/T₂)

When we change the pressure and temperature by a factor of 2, or when it is doubled at a time, no change in volume is occurred. Same case is observed when pressure and temperature are tripled.

Therefore, the scenario in which the change in pressure and the temperature is occurred but volume does not change is when pressures are doubled or tripled.

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As pressure rises, the equilibrium will move to the side of the reaction where there are less moles of gas. When the pressure drops, the equilibrium will move to the side of the process where there are more gas molecules.

Similar to how concentration has no bearing on Kc's value, pressure has no impact on Kp's.

As a result of the equilibrium shifting in favour of the direction with fewer moles due to an increase in pressure, the pressure falls.

Kp is unchanged because the reactant to product partial pressure ratio remains constant.

According to Charles' law, a gas's volume will double if its temperature doubles.

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Calculate the change in temperature produced by the addition of 1 kcal of heat to 100 g of steel.

Csteel= 0.118

Change in temp: 84.7 degrees Celsius

Explanation:

1. (Write down all units.)

q= 1

m= 100

C= 0.118

2. (Remember q=mcΔT)

3. (Calculate the amount needed to raise the 100g by 1 degree.)

100 x 0.118= 11.8 c

4. (Convert kcal to cal.)

1 kcal= 1000 calories.

5. (Divide calories given by calories needed.)

1000/11.8= 84.75

Oxaloacetate will accumulate and citrate will decrease.

Every cell in the human body contains the energy metabolite oxaloacetate. It plays a crucial role in the Krebs Cycle in the mitochondria, which powers the cells. It is also a crucial precursor metabolite in the process of gluconeogenesis, which produces glucose for the heart and brain when blood sugar levels are low.

Pyruvate is carboxylated to form oxaloacetate (OAA). Adenosine triphosphate is used in this reaction, which needs energy to proceed (ATP).

Daikon radish, sacred lotus, cucurbita (gourd), and tarragon are some foods that contain oxalacetic acid, which makes it a potential biomarker for the consumption of these foods.

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Sulfide ion (S+) with +1 charge has the same electron configuration as neutral phosphorus in its ground state. With the chemical formula S, Sulphur dioxide is an inorganic anion of Sulphur.

Following is the neutral phosphorus ground state electron configuration at atomic number 15.

phosphorus-15: 1s, 2s, 2p, 6, 3s, 2p

The electronic configuration of sulphur, which has atomic number 16, is once more as follows.

S-16: 1s, 2s, 2p, 6, 3s, 2p, 4.

From the aforementioned electronic configuration, we can infer that sulphur has one more electron in its valence shell than does phosphorus.

Sulphur must therefore release one electron from its valence shell, converting it from S -1e——>S+, to achieve the same electron configuration as phosphorus, which has 15 electrons.

Similar to this, the sulfuric acid ion, S2- - 3e—->S+

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The pH when 88.5 g of HBr is added will be 7.224

Molarity of HOCl = 0.332 M

Molarity of NaOCl = 0.405 M

Mass of HBr = 88,5 g

pH after adding 88.5 g HBr = ?

For acidic buffer we use the following formula:

   pH =pKa + log (salt / acid)

pKa of HOCl = 7.54

    pH = 7.54 + log (0.405 / 0.332)

    pH = 7.54 + log 1.22

    pH = 7.54 + 0.0864

    pH = 7.623

Calculate the pH after adding 88.5 g HBr

First, calculate the number of moles of HBr added

    number of moles = mass / molar mass

    number of moles of HBr = 88.5 g / 80.91 g/mol

    number of moles of HBr = 1.094 mol

Now the acidity of the solution will be:

   acidity = 0.332 + 1.094

   acidity = 1.426 mol

   excess amount of salt =  1.094 - 0.405

   excess amount of salt = 0.689 mol

   pH = 7.54 + log (0.689 / 1.426)

   pH = 7.54 + log 0.483

   pH = 7.54 + (-0.316)

   pH = 7.224

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The reaction between potassium phosphate with aluminum iodide will produce aluminum phosphate and potassium iodide. By the general solubility rules, aluminum phosphate will be insoluble in water resulting in the formation of a precipitate.  [tex]K 3 P O 4 ( a q ) + A l I 3 ( a q ) > A l P O 4 ( s ) + 3 K I ( a q )[/tex] Let us break the reaction into a total ionic equation.  [tex]3 K + ( a q ) + P O 3 -4 ( a q ) + A l 3 + ( a q ) + 3 I - ( a q ) > A l P O 4 ( s ) + 3 K + ( a q ) + 3 I - ( a q )[/tex] Then, we remove the spectator ions to establish the net ionic equation. [tex]P O 3 - 4 ( a q ) + A l 3 + ( a q ) > A l P O 4 ( s )[/tex]

what is a net ionic equation for a precipitation reaction?

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DNA damage leads to accumulation of ____phosphorylated____ p53, which ___increases____ production of a CDK inhibitor to ___halt_____ the cell cycle.

Phosphorylation is the attachment of phosphate groups to molecules or ions. This process and its reverse dephosphorylation are widely used in biology. Phosphorylation of proteins often activates many enzymes. Protein kinases are activated by phosphorylation, activating a series of events that lead to phosphorylation of various amino acids.

When activated, p53 induces the expression of various gene products, causing either prolonged cell cycle arrest in G1, preventing proliferation of damaged cells, or apoptosis to remove damaged cells from the body .

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Mass of 19.1 ml of ethanol is 15.2418 g

What is density?

The substance's mass per unit of volume is its density (also known as specific mass or volumetric mass density). The Latin letter D can also be used to represent density, however the most common symbol is (the lower case Greek letter rho). Mass divided by volume is the mathematical definition of density.

Temperature and pressure have an impact on a substance's density. For solids and liquids, this variance is often negligible, whereas for gases, it is significantly higher. A loss in volume and subsequent increase in density occur when pressure is applied to an object. With a few exceptions, a substance's density is decreased by expanding its volume as its temperature is raised. In most materials, heating the bottom of a fluid induces convection, or the movement of heat from the bottom to the top, because the heated fluid rises relative to the denser unheated material due to its decreased density.

Given,

density of ethanol(D) = 0.798 g/ml

 volume(v) = 19.1 ml

 Density = mass/ volume

or D= m/v

mass(m) = D* v

           m = 0.798* 19.1= 15.2418 g

Hence, mass of 19.1 ml of ethanol is 15.2418 g.

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The delta notation, indicating the polarity of for the presented covalent bonds are:

δ+   C-O   δ-

δ-   O-Cl   δ+

δ+   O-F   δ-

δ+   C-N   δ-

δ+   C-Cl   δ-

δ-   S-H   δ+

δ+   S-Cl   δ-

How delta notation indicate the polar bonds?

Atoms with varying electronegativities form polar bonds.

The polarity direction is denoted using the delta notation.

A partial negative charge (represented by the symbol -) is acquired by the atom with the higher electronegativity, whereas a partial positive charge (represented by the symbolδ +) is acquired by the atom with the lower electronegativity.

Let's consider the following elements with their electronegativities.

C (2.5)

O (3.5)

Cl (3.0)

F (4.0)

N (3.0)

S (2.5)

H (2.1)

The delta notation for the presented bonds are:

δ+   C-O   δ-

δ-   O-Cl   δ+

δ+   O-F   δ-

δ+   C-N   δ-

δ+   C-Cl   δ-

δ-   S-H   δ+

δ+   S-Cl   δ-

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The polarity can be established using the electronegativity (obtained from the periodic table). The best and simplest approach to tell if a molecule is polar or non-polar, though, is to look at its molecule shape.

A molecule is considered to be polar if its core atom has a single pair of electrons. For instance, H2O is polar because the oxygen atom's lone pairs give it a non-symmetrical shape (bent or v-shaped molecular geometry). So, no lone pairs are non-polar, right? Wrong. Not all molecule having a single lone atom at their centre are non-polar. They might be linear or tetrahedral, for sure, but that depends on what is connected to the main atom. For instance, CCl2F2 is polar while CH4 is a non-polar chlorofluorocarbon.

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Answer:

Mg + CuSO₄ = Cu + MgSO₄

Answer:

isoelectronic pH = 6.003

Explanation:

isoelectronic pH = (pKa1+pKa2)/2

The temperature of the metal varied more than the temperature of the water, but the metal also lost heat generated as the water acquired it.

Some of the nearly diamond-hard wear plates used in industrial applications start to weaken between 280° and 350°F. At 280°F, pork butt can be cooked. In general, there is good likelihood that a particularly hard steel component will soften when it is subjected to high temperatures.

Steel emits colors that are incandescent above 800 degrees Fahrenheit. Steel gets an ever brighter shade of red between 1000 and 1500 degrees Fahrenheit. Steel first becomes orange and then yellow between 1600 and 1900 degrees Fahrenheit.

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The equation of what happens when iron (III) hydroxide is placed in water is: [tex]Fe (OH)_3 (s) --- > Fe^{3+} (aq) + 3OH^- (aq)[/tex]

Iron (III) hydroxide is a salt that is sparingly soluble when placed in water. This is unlike many salts that are either soluble or insoluble in water.

Because of the partial solubility of iron (III) hydroxide in water, an equilibrium is created between the salt and its ionic component. The equation is as follows:

[tex]Fe (OH)_3 (s) < --- > Fe^{3+} (aq) + 3OH^- (aq)[/tex]

In this equilibrium state, a host of factors exist that could shift the equilibrium to the left or to the right. For example, as more and more salt is added to the water, more of the ionic components are formed.

One other factor that could cause a shift in the equilibrium is temperature. The higher the temperature, the higher the solubility and the more the ionic components that are formed.

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A quantity of gasoline injected into car engine has a potential chemical energy of 100 j. All of this energy is not converted into useable work because some energy is wasted as heat.

What is potential energy?

Your body can use the energy created when these molecules are broken down to perform tasks like walking or thinking. The potential energy in food molecules is not the only source, though. Every molecule that makes up the physical universe has potential energy stored inside its bonds.

Let's cross a few stepping-stones to learn why chemical energy has the potential to do work. We'll explore fundamental concepts related to molecules, chemical bonding in general, and some fundamental laws governing chemical processes. You'll see how the net overall energy balance of a chemical reaction determines the potential energy available for use once we've put everything together.

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Reduce risk factors that are easily altered,  as smoking, excessive alcohol consumption, poor diet, insufficient physical activity. Establishing ,enforcing sound legislative protections against non-communicable diseases .

A transmittable disease is one that can be spread from one generation to another via a number of routes, such as contact with blood or body fluids, inhalation of an airborne virus, or insect bites.

The design and evaluation of illness preventive and control initiatives as well as the identification of common-source outbreaks depend on the reporting of communicable illness cases. Everybody will probably experience a communicable sickness at some time during their lives.

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