From previous experiments, this chemical reaction is known to absorb of energy. The position of the piston is monitored, and it is determined from this data that the system does of work on the piston during the reaction. Is the reaction exothermic or endothermic? exothermic endothermic Does the temperature of the water bath go up or down? up

Answer:

The answer to this question is A.

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Answer: 5L O2 x 1 mol O2/ 22.4L O2 x 2 mol H20/ 1 mol O2 x 22.4L H20/ 1 mol H20 = 10 L H2O

Explanation:

For future reference though, since its at STP that means that the coefficient are in proportion. Since oxygen has a coefficient of 1 and water has a coefficient of 2 for every 1 liter of oxygen there is 2 liters of water. Hence you started with 5 liters and ended with 10

Answer:

Fe + CuCl2 = FeCl2 + Cu

Explanation:

This is already balanced.

The asbestos exposure during the years 1982 and 1983 was 2.5 fibers per cubic centimeter and 0.8 fibers per cubic centimeter respectively. So asbestos exposure decreased by 1.7 fibers per cubic centimeter during the year 1983.

Breathlessness Persistent, dry cough Chest pain or tightness Lack of a dry, crackling sound in the lungs when you breathe in Wider and rounder fingers and toes are some of the symptoms of asbestos exposure.

The largest group of people exposed to asbestos is those working in the construction industry. Historically, asbestos was also used by pipe fitters and shipyard workers. In addition, asbestos was used by military personnel, auto mechanics, and many other occupations.

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Answer:

-4

Explanation:

An atom becomes charged when the number of protons does not equal the number of electrons. For example, if an element has six protons but only five electrons, the net charge of the element is +1. Conversely, if an element has six protons but seven electrons, then the net charge of the element is -1.

Answer:

x/2

Explanation:

X = 2 molecules of H2

For 2 molecules of H2, there's only 1 molecule of O2. Meaning, there's twice the amount of H2, so O2 = x/2 molecules.

I hope I'm understanding this question right.

Answer:

2nd law

Explanation:

Hope I helped. Plz mark brainliest

The number of moles of gas produced from the reaction of 2.00g of potassium with an excess amount of water is 0.025 moles.

The reaction of potassium with an excess amount of water is:

2K + 2H\(_2\)O \(\rightarrow\) 2KOH + H\(_2\)

To calculate the moles of hydrogen gas first we need to calculate moles of potassium in 2.00g

No. of moles = (mass) / (molecular mass)

The mass given is 2.00 g and the Molecular mass is 39.09 units

∴ No. of moles = (2) / (39.09) = 0.05

From the above reaction, we get that 2 moles of potassium give 1 mole of hydrogen gas. Thus, 0.05 moles of potassium gives 0.025 moles of hydrogen gas.

Therefore, the no. of moles of hydrogen gas produced is 0.025 moles.

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The molecules that assists deoxyribonucleic acid (DNA) in its organization is the proteins. That is option A.

Deoxyribonucleic acid (DNA) is defined as the hereditary molecules in a living organism that stores instructions for making other large molecules which are inherited from the parent.

In the structure of the deoxyribonucleic acid, they are made made up of base pairs that are organised by proteins known as histones.

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The combination from the available option that will make a solution would be sugar and water.

Solutions are obtained when solutes dissolve in solvents.

In other words, a solute must be able to dissolve in a solvent before a solution can be formed.

Oil and water cannot mix, and thus, cannot form a solution. Sand is insoluble in water and ice and water are the same.

Thus, the only option left is sugar and water. Sugar dissolves in water to form a sugar solution.

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Answer:

Helper

Explanation:

is the expaltin of the explatin

Answer:

The balanced equation is:

2 HNO3 + Mg ---> Mg(NO3)2 + H2

From the equation, we can see that we need twice the moles of HNO3 than the moles of Mg

Moles of Mg:

Molar mass of Mg = 24 g/mol

Moles = Given mass / Molar Mass

Moles of Mg = 4.47 / 24 = 0.18 moles (approx)

Hence, 2(moles of Mg) = 0.36 moles of HNO3 will be consumed

Number of moles of HNO3 after the reaction is finished is the number of unreacted moles of HNO3

Unreacted moles of HNO3 = Total Moles - Moles consumed

Unreacted moles of HNO3 = 0.64 moles (approx)

Since we approximated the value of moles of Mg, the value of remaining moles of HNO3 will also be approximate

From the given options, we can see that 0.632 moles is the closest value to our answer

Therefore, 0.632 moles will remain after the reaction

Answer:

i) The size of X ion is greater than that of X atom even though both contain the same number of protons because the ion has fewer electrons compared to the atom. When an atom forms an anion (negative ion), it gains electrons, which causes increased electron-electron repulsion. This repulsion causes the electron cloud to expand, and as a result, the ion becomes larger than the neutral atom.

In the case of element X, when it forms an ion with a -3 charge, it will gain 3 more electrons, increasing the total number of electrons to 18. This will cause the size of the X ion to be larger than the neutral X atom.

ii) To determine the compound of X in the -3 oxidation state, we first need to determine the element's identity. We know that X has 15 electrons in total (2 in the K shell, 8 in the L shell, and 5 in the M shell). Therefore, X has an atomic number of 15, which corresponds to phosphorus (P).

Since phosphorus is in the -3 oxidation state, it gains 3 electrons and becomes P^3-. To form a compound, we need a cation that can balance the negative charge. A common example is aluminum (Al), which has a +3 charge (Al^3+). When phosphorus and aluminum combine, they form the compound aluminum phosphide with the formula AlP.

The volume of ammonia would be produced by this reaction 4.56mL of nitrogen were consumed is 9.13 mL of ammonia.

Volume is a unit used to describe how much space a substance or thing takes up. It is a real thing with a physical value that can be measured in liters, milliliters, cubic meters, or cubic centimeters.

The chemical equation for the reaction of nitrogen and hydrogen gases to produce ammonia gas is as follows:

N₂ + 3H₂ → 2NH₃

The balanced equation's stoichiometry states that 2 moles of ammonia are created when 1 mole of nitrogen combines with 3 moles of hydrogen. This indicates that nitrogen and ammonia have a mole ratio of 1:2.

We must first estimate how many moles of nitrogen were reacted in order to calculate the volume of ammonia created. The ideal gas law allows us to do the following:

PV = nRT, where R is the gas constant, n is the number of moles, P is the pressure, V is the volume, and T is the temperature.

We can assume that the pressure is constant and cancel it out because the gases are not contained:

V = nRT/P

The volume of 1 mole of gas is 22.4 L at standard temperature and pressure (STP), which are 0°C and 1 atm. As a result, the amount of nitrogen that reacted was:

n(N2)  = 4.56 mL × (1 L/1000 mL) × (1 mol/22.4 L) × 0.000204 moles.

As nitrogen and ammonia have a mole ratio of 1:2, the amount of ammonia produced is calculated as follows: n(NH₃) = 2 × n(N₂) = 0.000408 moles

In order to calculate the volume of ammonia produced, we can once more utilize the ideal gas law:

V(NH₃) = n(NH₃) × V(molar)= 0.000408 moles × 22.4 L/mol = 0.00913 L.

The amount of ammonia produced, rounded to three significant digits, is 9.13 mL = 0.00913 L. Hence, the answer is: 9.13 mL of ammonia.

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Answer:

0.00500M of Na₂C₂O₄

Explanation:

When are dissolved in 150 mL of 1.0 M H2SO4.

We can solve this problem finding molarity of sodium oxalate: That is, moles of Na2C2O4 per liter of solution. Thus, we need to convert the 0.1005g to moles using molar mass of sodium oxalate (134g/mol) and dividing in the 0.150L of the solution:

0.1005g * (1mol / 134g) = 7.5x10⁻⁴ moles of Na₂C₂O₄

In 0.150L:

7.5x10⁻⁴ moles of Na₂C₂O₄ / 0.150L =

The concentration of the solution is 0.005 M.

From the information available in the question;

We know that;

Mass of  Na2C2O4 = 0.1005 g

Volume of solution = 150 ml

To obtain the number of moles of Na2C2O4;

Number of moles = mass/molar mass

Molar mass of Na2C2O4  = 134 g/mol

Number of moles =  0.1005 g /134 g/mol = 0.00075 moles

Concentration = number of moles/volume

Volume of solution = 150ml or 0.15 L

Concentration =  0.00075 moles/0.15 L

= 0.005 M

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Missing parts

An acidic solution of sodium oxalate (Na2C2O4) was prepared by dissolving ~0.100 g of Na2C2O4 in 150 mL of 1.0 M H2SO4 in a 250 mL Erlenmeyer flask. Calculate the concentration of the resulting sodium oxalate solution if 0.1005 g of Na2C2O4 was used.

Answer:

O nome "transição" vem da posição dos elementos na tabela, representando a transição do grupo 2 ao 13, pela sucessiva adição de elétrons ao orbital d. Elementos de transição externa (ou somente elementos de transição):

Answer:

esh eod jod mq'e

Explanation:

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Answer:

increasing the positive charge of the positively charged object and increasing the negative charge of the negatively charged object would make the oppositely charged objects attract each other more.

Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

The molarity of the solution will be:

B. 1.5 M, this can be calculated on adding the values of V and n in molarity formula.

It is defined as the ratio of number of moles of solute by the Volume of the solution in liters.

It is given by:

Molarity =  n/ V

What information do we have?

Volume = 5L

Moles of NaOH = 7.5 moles

On substituting the values

M= n/V

M= 7.5 moles / 5L

M= 1.5 M

Thus, the molarity of the solution is 1.5 M.

Hence, option B is correct.

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The mass of Aluminum Sulfate is 5.373 grams if you have \(2.837*10^{26\) atoms of Sulfur .

The molecular formula of Aluminum Sulfate is \(Al_2(SO_4)_3.\) In one molecule of aluminum sulfate, there are 3 sulfur atoms. To calculate the mass of aluminum sulfate, follow the steps below:

Step 1: Calculate the molar mass of aluminum sulfate using the periodic table.Al = 27.0 g/molS = 32.1 g/molO = 16.0 g/mol

(2 × Al) + (3 × S) + (12 × O) = molar mass of \(Al_2(SO_4)_3.\) = 342.2 g/mol

Step 2: Find the number of moles of sulfur in the given number of atoms of sulfur.2\(2.837*10^{26\) atoms of sulfur × 1 mol S/\(6.022 * 10^{23\)atoms S = 0.0470 mol S

Step 3: Use the molar ratio of sulfur to aluminum sulfate to calculate the number of moles of aluminum sulfate.1 mol \(Al_2(SO_4)_3.\) / 3 mol S = 0.333 mol\(Al_2(SO_4)_3.\) per mol S0.0470 mol S × 0.333 mol \(Al_2(SO_4)_3.\)/mol S = 0.0157 mol \(Al_2(SO_4)_3.\)

Step 4: Calculate the mass of aluminum sulfate.0.0157 mol \(Al_2(SO_4)_3.\) × 342.2 g/mol\(Al_2(SO_4)_3.\)= 5.373 g\(Al_2(SO_4)_3.\)

Therefore, the mass of Aluminum Sulfate is 5.373 grams if you have \(2.837*10^{26\) atoms of Sulfur.

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Stoichiometric amounts relate to the proportional amounts of reactants and products in a balanced chemical equation.

What transpires during a chemical reaction to the molecules of the reactants?

Only atoms from the reactants can wind up in the products of a chemical reaction. No atoms are annihilated or made into new ones. To create the products, the reactants come into contact with one another, the bonds between their atoms are broken, and the atoms then rearrange and establish new bonds.

The frequency of collisions between the two reactants will grow as the reactant concentration rises. There are times when collisions don't cause a response (atoms misaligned or insufficient energy, etc.). More collisions and reaction possibilities result from higher concentrations.

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Answer:

The volume of acetone is 9.24 mL

Explanation:

Approximately 90.6 g of K₂Cr₂O₇ would precipitate out of the solution when cooled from 80°C to 20°C.

To determine how much solute will precipitate out of a solution of potassium dichromate (K₂Cr₂O₇) when cooled from 80°C to 20°C, we apply the following method:

At 80°C:

Initial amount of K₂Cr₂O₇ = 100 g/L

At 20°C:

Solubility of K₂Cr₂O₇ = 9.4 g/L

Amount of K₂Cr₂O₇ that would remain in solution at 20°C = 9.4 g/L x 1 L = 9.4 g

Therefore, the amount of K₂Cr₂O₇ that would precipitate out of the solution when cooled from 80°C to 20°C would be:

Amount of K₂Cr₂O₇ that precipitates out = Initial amount - Amount that remains in solution at 20°C

Amount that precipitates out = 100 g - 9.4 g = 90.6 g

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The complete question is below:

When 100 g of k2cr2o7 in 1 liter of water is cooled from 80oc to 20oc, how much solute will precipitate out of the solution?.

Answer:

\(0.0397\ \text{mol}\)

Explanation:

Number of molecules of water = \(2.39\times 10^{22}\)

\(N_A\) = Avogadro's number = \(6.022\times 10^{23}\ \text{mol}^{-1}\)

Number of moles is given by

\(\dfrac{2.39\times 10^{22}}{6.022\times 10^{23}}\)

\(=0.0397\ \text{mol}\)

The number of moles of water is \(0.0397\ \text{mol}\).

Answer: In a chemical reaction substances elements and compounds called reactants are changed into other substances compounds and elements called products.You can't change one element into another in a chemical reaction that happens in nuclear reactions.

Explanation:

Answer:

telescopes and microscopes both use lenses

Answer:

Calculate the volume (in mL) of the 1.356 M stock NaOH solution needed to prepare 250.0 mL ... Glucose (molar mass=180.16 g/mol) is a simple, soluble sugar ... g of glucose in enough water to make 500.0 mL of solution. • Step 2: Transfer 18.6 mL of the glucose

Explanation:

The original mass of Tritium (hydrogen-3) was 13.4mg if its current mass is 0.42 micrograms.

The formula for radioactive decay is given by:

N = N0 x (1/2)^(t/T)

where,

N = final number of radioactive atoms

N0 = initial number of radioactive atoms

t = time elapsed

T = half-life of the radioactive substance

Let's substitute the given values into the formula:

0.42 μg = N0 x (1/2)^(60/12)

0.42 μg = N0 x (1/2)^5

0.42 μg = N0 x 1/32

N0 = 0.42 μg x 32

N0 = 13.44 μg

Therefore, the original mass of the tritium sample was 13.44 micrograms.

What is radioactive decay?

Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting ionizing radiation, such as alpha particles, beta particles, and gamma rays. This process can result in a change in the number of protons and/or neutrons in the nucleus, leading to the transformation of one element into another. The rate of decay is typically characterized by a half-life, which is the time required for half of the atoms in a sample to decay.

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Answer:

Vestigial

Explanation:

The retention of genetically determined traits or structures that have partially or completely lost their ancestral purpose in a specific species is known as vestigiality. In most cases, evaluating the vestigality requires comparison with comparable traits in closely related species.