What occurs in an exothermic reaction?

A. A smell is produced
B. There is an increase in temperature.
C. Fizzing happens.
D. There is a color change.
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Answer:

gas is the state of matter with a defined volume and shape

a) The molarity of base is 0.0795 Mol/dm^3

b) The Concentration of hydroxyl ion in g per 250 cm³ of the solution is  19.9 g

c) Mass of sodium tetraoxosulphate [VI] formed is 0.21 g

If we have that;

1.3 g of the acid is contained in the  250 cm³ solution

x is contained in the 1000 cm³ solution

x = 5.2 g/dm^3

Molar concentration of the acid =  5.2 g/dm^3/ 98 g/mol

= 0053 mol/dm^3

Then we have that;

CAVA/CBVB = NA/NB

Thus;

CAVANB = CBVBNA

CB = CAVANB/VBNA

CB = 0053  * 18.75 * 2/25 * 1

CB = 0.0795 Mol/dm^3

b) Concentration in gg per 250 cm³ of the solution = 0.0795 Mol/dm^3 * 1 dm^3 * 250cm^3

= 19.9 g

Number of moles of the acid = 0.0795 Mol/dm^3 *  18.75 /1000 L

= 1.49 * 10^-3 moles

c)  If 1 mole of the acid yields 1 mole of the salt 1.49 * 10^-3 moles

Then the mass of the salt = 1.49 * 10^-3 moles * 142 g/mol

= 0.21 g

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Aluminum ion has a charge of 3+, Al³⁺, and sulfate is SO₄²⁻, so the compound aluminum sulfate has to have a number of aluminum and sulfate such that the final charge is zero, so the proportion on aluminum sulfate is:

That way we have 6+ and 6-, so neutral compound.

This means that for 1 mol of aluminum sulfate, we have 2 moles of aluminum ion. The molar concentration is the number of moles of solute divided by the volume of solution, so it is directly proportional to the number of moles.

So, we can use a rule of three as follows:

aluminum ion --- aluminum sulfate

2 --- 1

x --- 0.646 M

So:

So, the concentration of aluminum ion in this solution is 1.292 M.

Answer:

Explanation:

How many atoms are in a 3.5 g sample of sodium (Na)? In this example, multiply the grams of Na by the conversion factor 1 mol Na/ 22.98 g Na, with 22.98g being the molar mass of one mole of Na, which then allows cancelation of grams, leaving moles of Na.

Answer:

ONE MOLE of any element has 6.023x1023 atoms of that element. Therefore 1 mole or 22.99 grams of Na = 6.023x1023 atoms of Na.

Explanation:

The balanced chemical equation for the galvanic cell reaction using shorthand notation =  2Al + 3Cu²⁺ ⇒ 2Al³⁺  + 3Cu

Option C is correct .

Al → Al³⁺   + 3e⁻

Cu³⁺ + 2e⁻ → Cu

              2 Al → 2Al³⁺ + 6e⁻

              3 Cu³⁺  + 6e⁻ → 3Cu

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

            2Al + 3Cu²⁺ ⇒ 2Al³⁺  + 3Cu

When an electrode in a galvanic cell is exposed to the electrolyte at the electrode-electrolyte interface, the metal electrodes atoms tend to produce ions in the electrolyte solution, leaving the electrode's electrons behind. resulting in a negative charge on the metal electrode.

A galvanic cell is an electrochemical device that uses chemical reactions between two different conductors connected by an electrolyte and a salt bridge to produce electric energy. The unconstrained oxidation-decrease responses among the parts power a galvanic cell.

Incomplete question :

What is the balanced chemical equation for the galvanic cell reaction expressed using shorthand notation below? Al(s) Ap+ (aq) 1 Cu2+(aq) Cu(s) * -

A. 3 Cu(s) + 2 A⁺ (aq) -- 3 Cu²⁺(aq) + 2Al(s)

B. 2 Al(s) + 3 Cu²⁺ (aq) + 2 A₈+ (aq) + 3Cu(s)

C.  Al(s) + 2 Cu₂(aq) - 3 Al₃⁺ (aq) + 2 Cu(s)

D. 2 Cu(s) + 3 Al₃⁺(ad) - 2 Cu²⁺ (aq) + 3 Al(s)

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The quantity of heat (in kj) required to boil 945.1 g of water is 2134.30 KJ

Enthalpy of vaporization is theamount of heat required to evaporate the one mole of liquid under constant temperature and pressure. It is also called heat of vaporization.

Δ\(H_{vap}\)(enthalpy of vaporization of H2o)=40.7 KJ/mol

moles of H2o=945.1 gm

moles of H2o=mass/molar mass

                    =945.1gm/18.02 gm/mol

                     =52.44 mol

Δ\(H'_{vap}\) to boil 426.1 of H2O= Δ\(H_{vap}\)*no. of moles

                                          = 40.7 KJ/mol*52.44 mol

                                          = 2134.30 KJ

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Answer:

true hope that helps

Explanation:

Answer: A the location of atoms, groups, or ions relative to one another and the number, type, and location of covalent bonds

Explanation: I just took the assessment and in my notebook molecular structure has a definition that is literally answer A. Also I got it right lol.

Within the textbook, the idea that goods would be equally distributed if the distributor was not allowed to know of his/her status or position is referred to as the veil of ignorance.

This concept, introduced by philosopher John Rawls, suggests that in a just society, individuals should make decisions about the distribution of resources and opportunities without any knowledge of their own advantages or disadvantages in that society.

The veil of ignorance serves as a thought experiment to encourage impartiality and fairness, as decision-makers would be motivated to create a system that benefits everyone, regardless of their personal circumstances, ensuring a more equitable distribution of goods.

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According to the data, gallium has an atomic mass of 69.723 amu.The Ga-69 isotope has a mass of 68.926 amu and an abundance of 60.11%.So, it can be assumed that the other Ga isotope has a percentage abundance of (100-60.11%), or 39.89%.As a result, choice an is accurate.

According to the data, gallium has an atomic mass of 69.723 amu.The Ga-69 isotope has a mass of 68.926 amu and an abundance of 60.11%.So, it can be assumed that the other Ga isotope has a percentage abundance of (100-60.11%), or 39.89%.

A carbon-12 atom's mass is precisely 1/12 of an atomic mass unit.The nucleus of an atom of carbon-12 contains six protons and six protons.It's written as a.m.u or u. (unified).Atomic masses are expressed using this unit of mass.The sum of the nuclear rest mass and or the proton resting mass is 1 a.m.u.

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I agree with the above answer.

Avogadro’s wide variety, the wide variety of gadgets in a single mole of any substance (described as its molecular weight in grams), is the same as 6.02214076 × 1023. The gadgets can be electrons, atoms, ions, or molecules, relying on the character of the substance and the individual of the reaction (if any).

Avogadro's Law

Avogadro's law states that an "equal volume of all gases at the same temperature and pressure contain the same number of molecules"

For example:-

18g of water = 1 mole = 6.022* 10²³ molecules of water

1.008g of hydrogen = 1 mole = 6.022 *10²³ atoms of hydrogen

96.06g of SO₄²- ion = 6.022*10²³ ions of SO₄²-.

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Answer:

Properties: The melting point of phosphorus (white) is 44.1°C, boiling point (white) is 280°C, specific gravity (white) is 1.82, (red) 2.20, (black) 2.25-2.69, with a valence of 3 or 5. There are four allotropic forms of phosphorus: two forms of white (or yellow), red, and black (or violet).Oct 7, 2019

Atomic Number: 15

Atomic Weight: 30.973762

Explanation:

: )

Answer:

Properties: The melting point of phosphorus

Atomic Number: 15

Atomic Weight: 30.973762

Discovery: Hennig Brand, 1669 (Germany)

To accomplish this, the half-reaction with the smallest number of electrons may be multiplied. When writing the balanced equation, the half-reaction for the anode should be reversed to account for the oxidation occurring at the anode. Finally, to use the equation ecell, the sign of the anode potential must be reversed.

When answering questions on the Brainly platform, it is important to be factually accurate, professional, and friendly. One should be concise and avoid providing extraneous amounts of detail. Typos and irrelevant parts of the question should be ignored. The answer to the given question is as follows:By convention, standard electrode potentials are quoted as reduction potentials. The half-reaction for the anode must be reversed when writing the balanced equation for the overall reaction. The sign for the anode potential must be reversed to use the equation ecell.Standard electrode potentials are measured for half-reactions in their standard states, such as solutions of 1 mol/L and gases at a pressure of 1 atm. It indicates the ability of a half-reaction to accept electrons, with the half-reaction with the greatest reduction potential being the strongest oxidizing agent.When writing a balanced equation for a redox reaction, half-reactions and/or electrode potentials must be manipulated in order to balance the number of electrons transferred. Since the electrons must cancel out in the overall reaction, one half-reaction should be multiplied to match the number of electrons in the other half-reaction.

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Answer:

B- why or how because any scientist deals with matter it's relationships ,properties and its composition which can be inferred from the questions why and how

H₂CO₃ is an acid that gives a proton to H₂O, which accepts the proton as a base. H₂O's conjugate acid is H₃O⁺, and H₂CO₃'s conjugate base is HCO₃⁻. H₂O/H₃O⁺ and H₂CO₃/HCO₃⁻are the conjugate acid-base pair in this process.

Two chemical species are referred to as an acid-base pair when a proton (H+) from one species is transferred to the other. The species that accepts a proton is known as the base, while the species that provides a proton is known as the acid.

b. H₂O functions as an acid by giving a proton to a different H₂O molecule, which accepts the proton and functions as a base. H₃O⁺ is the conjugate acid of H₂O, whereas OH⁻ is the conjugate base of H₂O. H₂O/H₃O⁺ and H₂O/OH⁻ are the conjugate acid-base pair in this process.

c. H₂S functions as an acid by giving a proton to NH₃, which accepts the proton and functions as a base. NH₄⁺ is the conjugate base of H₂S, whereas NH₃'s conjugate acid is NH₄⁺. NH₃/NH₄⁺ and H₂S/HS⁻ are the conjugate acid-base pair in this reaction, respectively.

d. H₂PO₄⁻ functions as an acid by giving a proton to H₂O, while H₂O functions as a base by taking the proton. H₂O's conjugate acid is H₃O⁺, and H₂PO₄⁻'s conjugate base is HPO₄²⁻. H₂O/H₃O⁺ and H₂PO₄⁻/HPO₄²⁻ are thus the conjugate acid-base pair in this process.

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Answer:

c

Explanation:

The wound will be healed by the production of new cells near the wound by the cell replication process and the therefore the identical cells are produced by the mitosis to repair the damaged tissues.

Note the below points about mitosis;

Thus, mitosis is the process involved in the healing of wound in living beings.

Therefore, we can say that the answer of the question is C. The cells near the wound will produce identical cells by mitosis to repair the damaged tissues.

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Answer:

The number of half dollars in the stack of the height of the Gateway Arch in St. Louis is 89,313 half dollars

Explanation:

The given height of the Gateway Arch in St. Louis = 630 ft

The thickness of each half dollar = 2.15 mm

By conversion of factors, we have;

1 feet = 304.8 mm

Therefore;

630 ft. = 304.8 × 630 mm = 192,024 mm

The number of half dollars that will stack up to 630 ft or 192,024 mm, is therefore, given as follows;

The number, n, of half dollars in the stack of the height of the Gateway Arch in St. Louis = The height of the Gateway Arch in St. Louis/(The thickness of each half dollar)

n = 630 ft/(2.15 mm/(half dollar)) = 192,024 mm/(2.15 mm/(half dollar)) = 89,313.49 ≈ 89,313 half dollars

The number of half dollars in the stack of the height of the Gateway Arch in St. Louis = 89,313 half dollars.

Answer:

2.78%

Explanation:

Answer:

hello, the answer is polygenic:)

Answer:

D. Shaking a cake [...]

Explanation:

None of the rest are actual physical models representing earthquakes.

Hope that's right! :D

pluses and negatives

D) because it has negative and positive signs

Answer:

D. This D one model best illustrates Thomson explanation of atom

Explanation:

Answer:

False {final answer}

Explanation:

The statement refers only about chemical change and not about physical change. Physical changes happens when substances undergo a change that does not change their chemical composition.

The empirical formula for the compound is \(PCl_{3}\)

The empirical formula of a compound is the formula in which the atoms of all the elements are present in their simplest whole-number ratio. It's possible that a compound's empirical formula and molecular formula are different.

Given Information:

P = 10.15 mg

Cl = 34.85 mg

Convert mg to moles

                                 31 mg of P ----------------- 1 mmol

                                 10.15 mg  ------------------   x

                                 x = 0.327 mmol of P

                                  35.5 mg of Cl ------------  1 mmol

                                   34.85 mg -----------------  x

                                 x = 0.982 mmol of Cl

Divide by the lowest number of mmoles:

For P = \(\frac{0.327}{0.327}\) = 1

For Cl = \(\frac{0.982}{0.327}\) = 3

So the empirical formula for the compound will be \(PCl_{3}\)

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Answer:

True

Explanation:

Water is the most common solvent among liquid solutions. It is able to dissolve a wide range of solutes due to its polar nature and ability to form hydrogen bonds with other polar molecules.

Answer:

9.05L

Explanation:

When 304 ml of a 0.600 M NaCl solution is mixed with 467 ml of a 0.260 M NaCl solution, the resulting NaCl concentration is approximately 0.394 M.

To determine the resulting concentration of sodium chloride (NaCl) when two solutions are mixed, we can use the principle of dilution. The total volume of the resulting solution can be obtained by adding the volumes of the two solutions being mixed.

Let's calculate the resulting concentration step by step:

Step 1: Calculate the moles of NaCl in the first solution.

Molarity (M) = moles of solute / volume of solution (in liters)

Given:

Initial volume of solution 1 (V1) = 304 ml = 304/1000 = 0.304 liters

Molarity of solution 1 (M1) = 0.600 M

Moles of NaCl in solution 1 (moles1) = M1 * V1

moles1 = 0.600 M * 0.304 L

Step 2: Calculate the moles of NaCl in the second solution.

Given:

Initial volume of solution 2 (V2) = 467 ml = 467/1000 = 0.467 liters

Molarity of solution 2 (M2) = 0.260 M

Moles of NaCl in solution 2 (moles2) = M2 * V2

moles2 = 0.260 M * 0.467 L

Step 3: Calculate the total moles of NaCl in the resulting solution.

Total moles of NaCl = moles1 + moles2

Step 4: Calculate the total volume of the resulting solution.

Total volume of solution (Vt) = V1 + V2

Step 5: Calculate the resulting concentration of NaCl.

Resulting concentration (Mf) = Total moles of NaCl / Total volume of solution (Vt)

Now let's plug in the values and calculate the result:

moles1 = 0.600 M * 0.304 L = 0.1824 moles

moles2 = 0.260 M * 0.467 L = 0.12122 moles

Total moles of NaCl = 0.1824 moles + 0.12122 moles = 0.30362 moles

Total volume of solution (Vt) = 0.304 L + 0.467 L = 0.771 L

Resulting concentration (Mf) = 0.30362 moles / 0.771 L

Converting to molarity:

Mf ≈ 0.394 M

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40.2 kJ of heat energy is required to vaporize 102 g of benzene at its boiling point.

First, we need to calculate the number of moles of benzene present in 102 g of benzene.

The molar mass of benzene, \(C6H6\) is 6(12.01 g/mol) + 6(1.01 g/mol) = 78.11 g/mol.

Number of moles of benzene = mass of benzene/molar mass of benzene

= 102 g / 78.11 g/mol

= 1.3078 mol

Next, we can use the formula for heat of vaporization to calculate the amount of energy required to vaporize this amount of benzene:

Heat energy = n x ΔHvap

where n is the number of moles of benzene and ΔHvap is the heat of vaporization of benzene.

Heat energy = 1.3078 mol x 30.8 kJ/mol

= 40.2 kJ

Therefore, 40.2 kJ of heat energy is required to vaporize 102 g of benzene at its boiling point.

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The precursors for the biosynthesis of the pyrimidine ring system include carbamoyl phosphate and aspartate. Carbamoyl phosphate is produced from the reaction between ammonia NH3 and carbon dioxide CO2, while aspartate is derived from the amino acid glutamine.

The glutamine indirectly contributes to the biosynthesis of the pyrimidine ring system by providing the precursor molecule aspartate. The precursors for the biosynthesis of the pyrimidine ring system include carbamoyl phosphate and aspartate. In this process, the biosynthesis of pyrimidines involves the formation of the pyrimidine ring system using carbamoyl phosphate and aspartate as the main precursors. The carbamoyl phosphate is generated from glutamine and CO2, while aspartate provides the additional atoms needed to form the ring structure.

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