In a laboratory, a student combines vinegar and baking soda into a beaker. The initial temperature is 28 degrees Celsius and the final temperature reading two minutes later is 20 degrees Celsius.

1. What happened to the heat in the surroundings?


2. Did an endothermic or exother mic reaction occur​

Answers

Answer 1

The reaction is endothermic because the temperature dropped from  28 degrees Celsius to  20 degrees Celsius.

Meaning of endothermic and exothermic reaction:

An endothermic reaction is one in which heat is absorbed from the surrounding resulting in decrease in temperature while an exothermic reaction is one in which heat is evolved causing the temperature to rise.

In the particular context of this question, the reaction is endothermic because the temperature dropped from 28 degrees Celsius to 20 degrees Celsius. The heat in the surroundings decreased.

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Related Questions

discuss the concentrations of reactants and products in the equilibrium in the two sketches and explain why the reactants are predominant species at the equilibrium in your graphs even though the equilibrium constant is larger than 1.

Answers

This indicates that the equilibrium state of the reaction—also referred to as an unfavourable equilibrium—favors the reactants.

The reaction mechanism might be one explanation for this. Reactants may build up before the equilibrium state is reached if the reaction has a slow step. The reaction's stoichiometry, in which the ratio of products to reactants is not ideal for product formation, may also be a factor.

Reactant concentrations can be lowered or product concentrations can be raised to tip the equilibrium in favor of product formation. Altering the reaction conditions, such as temperature or pressure, can also encourage the formation of the desired product.

Overall, a number of variables, such as the reaction mechanism, stoichiometry, and reaction conditions, affect the concentrations of reactants and products at equilibrium.

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solve and explain
Order: Promethazine Syrup \( 12.5 \mathrm{mg} \) by mouth On hand: How many mL will you give? Draw a line through the medicine cup indicating the correct amount:

Answers

If the Promethazine Syrup has a concentration of 5 mg/mL, you would need to administer 2.5 mL of syrup to provide a dose of 12.5 mg.

To solve this problem, we need to determine the volume in milliliters (mL) of Promethazine Syrup that corresponds to a dose of 12.5 mg. The information provided doesn't specify the concentration of the syrup, so we'll need to assume a concentration or obtain that information.

Assuming the concentration of the Promethazine Syrup is given as X mg/mL, we can set up a proportion to find the volume:

12.5 mg / X mL = Dose / Volume

Since we want to find the volume (in mL), we rearrange the equation:

Volume = Dose * X mL / 12.5 mg

To find the value of X, we would need to know the concentration of the syrup. Let's assume the concentration is 5 mg/mL for the purpose of this explanation.

Substituting the values into the equation:

Volume = 12.5 mg * 1 mL / 5 mg

Volume = 2.5 mL

To draw a line through the medicine cup indicating the correct amount, you would fill the cup with Promethazine Syrup up to the 2.5 mL mark.

It's important to note that the concentration of the syrup may vary, so it's crucial to verify the concentration before administering any medication. Additionally, dosages should always be determined by a healthcare professional following appropriate guidelines and considering factors such as the patient's weight, age, and medical condition.

Please consult with a healthcare professional or pharmacist for accurate dosing instructions and guidelines specific to Promethazine Syrup or any other medication.

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the empirical formula of a compound is SF6, and molar mass is 146.06g/ mol. find its molecular formula

Answers

Answer:

the molecular formula = SF6

Explanation:

firstly we have to list the firmulas we r goin to use to work out the molecular formula.

n=mass of compound ÷mass of empirical formulamolecula formula=n×empirical formula

now we use the 1st formula to find n which will be substituted into the molecular formula

We are going to take the mass we have been given in the question as the mass of the compound and substitute it to the formula.

Then we will work out the mass of empirical formula for the compound: Sulphur; 32 flourine;19 SF6_ 32+6(19)=146

now we finish off n

n=146.06÷146=1.000410959n=1

Lastly we work out the molecula formula

mf=(S1F6)1 ;S 1×1=1 ;F 1×6=6mf=SF6

the final answer will therefore be SF6

what is the equilibrium expression for the following reaction? h2so4 (l) ⇌ so3 (g) h2o (l)

Answers

The equilibrium expression for the following reaction? h2so4 (l) ⇌ so3 (g) h2o (l):  the final equilibrium expression for this reaction is: Kc = [SO3]

The equilibrium expression for the given reaction is:

Kc = [SO3][H2O] / [H2SO4]

where Kc is the equilibrium constant, [SO3], [H2O], and [H2SO4] are the molar concentrations of sulfur trioxide, water, and sulfuric acid respectively at equilibrium.
Hello! I'm happy to help with your question. The equilibrium expression for the reaction H2SO4 (l) ⇌ SO3 (g) + H2O (l) can be written using the equilibrium constant (Kc).

First, let's write the balanced chemical equation:
H2SO4 (l) ⇌ SO3 (g) + H2O (l)

Next, we'll write the equilibrium expression using the concentrations of the products and reactants:

Kc = [SO3] * [H2O] / [H2SO4]

In this expression, [SO3], [H2O], and [H2SO4] represent the equilibrium concentrations of the respective species. Keep in mind that only the concentrations of gases (SO3 in this case) are included in the equilibrium constant expression. Liquid concentrations, such as H2SO4 and H2O, do not affect the value of Kc.

So, the final equilibrium expression for this reaction is:

Kc = [SO3]

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Which of the following statements concerning mixtures is correct?
a. The composition of a homogeneous mixture cannot vary.
b. A homogeneous mixture can have components present in two physical states.
c. A heterogeneous mixture containing only one phase is an impossibility
d. More than one correct response..

Answers

The correct option from the given statements concerning mixtures is (d) more than one correct response.

The statement (a) "The composition of a homogeneous mixture cannot vary" is incorrect as the composition of a homogeneous mixture can vary. For example, a mixture of salt and water is homogeneous and its composition can vary depending on the amount of salt and water mixed in it.

The statement (b) "A homogeneous mixture can have components present in two physical states" is correct. Homogeneous mixtures are mixtures that are uniform throughout their composition, meaning that there is no visible difference between the components of the mixture. For example, a mixture of ethanol and water is homogeneous and its components are present in two physical states (liquid and liquid).

The statement (c) "A heterogeneous mixture containing only one phase is an impossibility" is incorrect. A heterogeneous mixture is a mixture where the components are not evenly distributed and the mixture has different visible regions or phases. However, it is possible for a heterogeneous mixture to contain only one phase. For example, a mixture of oil and water is heterogeneous but can have only one phase.

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Sucrose: density = 1.59 g/cm³. Your experiment showed a density of 1.68 g/cm³. What is the percent error *

Answers

Answer:

The answer is

5.66 %

Explanation:

The percentage error of the density can be found by using the formula

\(Percentage \: \: error(\%) = \frac{error}{actual \: \: number} \times 100 \\ \)

From the question

actual density = 1.59 g/cm³

error = 1.68 - 1.59 = 0.09

The percentage error is

\(P(\%) = \frac{0.09}{1.59} \times 100\% \\ = 5.66037735...\)

We have the final answer as

5.66 %

Hope this helps you

What is the purpose of excess hydrogen carbonate ion in the blood?

Answers

The AG of ATP hydrolysis in a test tube under standard conditions is -7.3 kcal/mol. The AG for the reaction A + B = C under the same conditions is +4.0 kcal/mol. What is the overall free-energy change for the coupled reactions under these conditions? a.-7.3 kcal/mol. b.-11.3 kcal/mol. c. -3.3 kcal/mol. d.+3.3 kcal/mol.

Answers

The correct option is (c) -3.3 kcal/mol.The overall free-energy change for coupled reactions can be determined by summing up the individual free-energy changes of the reactions involved.

In this case, the reactions are ATP hydrolysis (-7.3 kcal/mol) and A + B = C (+4.0 kcal/mol).

To calculate the overall free-energy change, we add the individual free-energy changes:

Overall ΔG = ΔG(ATP hydrolysis) + ΔG(A + B = C)

          = -7.3 kcal/mol + 4.0 kcal/mol

          = -3.3 kcal/mol

Therefore, the overall free-energy change for the coupled reactions under these conditions is -3.3 kcal/mol.

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I AM GIVING BRAINLIEST! PLEASEEEEEE HELPPPPPP I NEED HELPPP

How many atoms of nitrogen in 2.0 mol of dinitrogen monoxide, N2O?

Answers

Answer:

I think that the answer is N20:2(14.01)+1(16.06)=44.02g/mol(c) fluorine Di nitrogen monoxide contains how many mom 6.022 x

1023 mol N20

Where are the largest atoms located on the periodic table?

Answers

Answer:

In the periodic table, atomic radii decrease from left to right across a row and increase from top to bottom down a column. Because of these two trends, the largest atoms are found in the lower left corner of the periodic table, and the smallest are found in the upper right corner.

Explanation:

As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.

The balanced chemical equation is P(s) + 6 Cl₂(g) →→ 4 PCl₂(g). What is the mass in grams of phosphorus trichloride that can be formed from 216.8 grams of chlorine gas based on the balanced chemical equation?​

Answers

Answer:

279.895 grams

Explanation:

216.8 / molar mass of Cl2 (71 grams) = 3.0535

3.0535 / 6 moles of Cl2 = 0.5089

0.5089 x 4 moles of PCl3 = 2.0356

2.0356 x molar mass of PCl3 (137.5 grams) = 279.895 grams of PCl3

How do you stop a chemical burn from burning?

Answers

Remove dry chemicals.Remove contaminated clothing or jewelry. Bandage the burn. Rinse again if needed.

the amount of harm to the skin relies upon on how strong the chemical was, how lots of it become at the skin, and how long it become there. Chemical burns, even minor ones, can be very painful. A minor burn may heal inside a few days. however a extra extreme burn might also take weeks or maybe months to heal completely.you need to now not use ice, or even ice-bloodless water, on a burn. extreme cold carried out to a burn can further damage the tissue. to properly cool and clean a burn, remove any apparel that covers it.

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not chem but anatomy. Which of the following is the chronological
order of events that occur when a person is
trying to keep their balance?

Answers

You retain balance when the weight and the reaction forces are balanced.

What chronological events helps a person to keep balance?

Your question is incomplete but I think you want to know how a person can retain balance.

We know that we can only be keep balance when the forces that are acting on the person is balanced. The implication of it is that there are no unbalanced forces that are acting on the person.

The two forces that act on you when you stand are the weight and the reaction force. If these two forces are balanced then you can be able to retain your balance.

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plzzz!!! Write the equation for rusting urgently needed​

Answers

Answer:

\(Fe_{2} O_{3}\)

Explanation:

what are the two ways in which the physical state of matter can be changed​

Answers

The two ways in which the physical state of matter can be changed are melting and freezing.

Melting is the process by which a solid substance transitions to a liquid state. As a result, the energy added to the solid substance causes the molecules to vibrate at a higher rate. As a result, the heat breaks the bonds between the molecules, allowing them to flow freely.Freezing is the process by which a liquid substance transitions to a solid state. As a result, energy is removed from the liquid substance. The molecules in the substance are moving quickly, but when energy is removed, they slow down.Because of the decrease in energy, the molecules can no longer slide past one another and form a rigid structure, resulting in a solid state of matter.

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what safety equipment do you need if you are working with a strong base

Answers

Answer:

Closed-toe shoes, long pants, a lab coat, safety glasses with side shields or splash goggles, and gloves.

Explanation:

How does changing the substrate concentration compare to changing the enzyme concentration in this experiment?

Answers

In this experiment, both the substrate concentration and varying the enzyme concentration would have an impact on the enzyme activity, although at different rates.

Concentration of the enzyme: If there is a substrate available for the enzyme to bind to, then increasing the enzyme concentration will speed up the reaction. When all of the substrate has been incorporated, the reaction will no longer accelerate because there won't be any more substrate for new enzymes to attach to. Specifically, enzymes. Normally, just one or a few substrates can trigger an enzyme's reaction. Only one type of substrate will be accepted by some enzymes, which are more selective than others. Other enzymes can interact with a variety of molecules as long as they possess the chemical group or type of bond that the enzyme is looking for.

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Why does water vapor condense in the condenser tube?

Answers

Answer:

The water vapor molecules transfer energy to the colder air.

Explanation:

This makes water vapor molecules move more slowly their attractions of overcome their motion and they join together or condense to form liquid water

what is the most likely ionization state of alanine at ph 11 ?

Answers

The alanine molecule has a net negative charge at pH 11, where the amine exists as a neutral base and the carboxyl serves as its conjugate base.

The amino acid alanine is necessary for the synthesis of proteins. Vitamin B-6 and tryptophan are broken down using it. It provides the central nervous system and muscles with energy. It helps the body use glucose and boosts the immune system.

The alanine chemical structure reveals that the backbone is made up of two functional groups: the carboxyl group (COOH C O O H) and the amino group (NH2 N H 2), as well as a carbon atom attached to the side chain, CH3 C H 3.

The majority of proteins contain a large amount of the glycogenic amino acid alanine. Alanine can also be produced from other amino acids, particularly branched chain amino acids (BCAA) like valine, leucine, and isoleucine.

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zinc + nitrogen → zinc nitride

Answers

Answer:

.........................

..

zinc + nitrogen zinc nitride

Question 1 20 pts What types of organisms have cells with very large vacuoles? O Plants Fungi O Bacteria O Animals​

Answers

Answer:

Animals

I took the test

:))

how a sample of copper metal can be separated from the mixture ?

Answers

Answer:

It can be separated by simple fractional method

A thermometer is taken from a room where the temperature is 24

C to the outdoors, where the temperature is −11

C. After one minute the thermometer reads 7

C. (a) What will the reading on the thermometer be after 4 more minutes? (b) When will the thermometer read −10

C ? minutes after it was taken to the outdoors.

Answers

The thermometer will read -10°C after about 2.43 minutes.

(a) After four more minutes, the thermometer will read -1°C.

This is because the temperature difference between the room and outdoors is (24 - (-11)) = 35°C.

The thermometer then rises 7°C in one minute, so the thermometer is heated at 7°C/minute, i.e. 35°C in five minutes.

So the temperature of the thermometer after 4 more minutes is 7°C + 7°C + 7°C + 7°C = 28°C, 28°C - 35°C = -7°C, -7°C - 3°C = -10°C.

Thus the reading on the thermometer will be -1°C after four more minutes.

(b) To find out when the thermometer will read -10°C, use the formula:

time = (temperature difference ÷ heating rate) + time to start

       = (-10°C - 7°C) ÷ 7°C/minute + 1 minute

       = -17°C ÷ 7°C/minute + 1 minute≈ -2.43 minutes

Thus, the thermometer will read -10°C after about 2.43 minutes.

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carbon dating may be used to date (once living) materials that are between 100 and 40,000 years old. what percentage of carbon-14 remains in a sample after 1.99 x 104 years? the half-life of the first-order decay of carbon-14 is 5730 years.

Answers

The percentage of carbon-14 that will remain in a sample after 1.99 x 10⁴ years is 9.01%.

Half-life is defined as the time it will took a substance to reduce to half of its initial amount. The half-life of a substance is determined with respect to the rate of the reaction. It can be calculated using the formula below.

N(t) = N₀(1/2)^(t/T)

where N(t) = amount of substance remaining after time t

N₀ = initial amount of substance

t = time = 1.99 x 10⁴ years

T = half-life = 5730 years

Plug in the given values to the equation.

N(t) = N₀(1/2)^(t/T)

N(t) = N₀(1/2)^(1.99 x 10⁴ years/5730 years)

N(t) = N₀(0.09006)

Hence, the percentage that will remain is 9.01%.

N(t) / N₀ = 0.09006

N(t) / N₀ = 9.01%

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In a chemical reaction where an electron is exchanged from one reactant to another, the structure that loses an electron is?

Answers

Answer:

Oxidized

Explanation:

Oxidation and reduction are terms used to describe reactions in which  electrons move from one atom or molecule to another atom or molecule. Oxidation occurs when electrons are lost, while reduction occurs when electrons are gained. (The charge is reduced).  The two processes are linked, whenever one substance is oxidized another has to be reduced.

How much energy is required to take a 22. 0-g sample of liquid water at 25. 0 °c to steam at 145. 0 °c?.

Answers

Energy required to take a 22. 0-g sample of liquid water at 25. 0 °c to steam at 145. 0 °c is 58.6 KJ.

q1 = heat required to warm the water from 25.0 °C to 100.0 °C.

    = mCΔT

    = 22.0 g x  4.184 J∘C−1g−1 x 75

    = 6903.6 J

q2 = heat required to vapourize the water to steam at 100 °C.

    = mΔH vap  

    = (22.0 g  x 40.7  103  J/ mol )/18 g/ mol

    = 49744. 4 J

q3= heat required to warm steam from 100°C to 145.0 °C.

    = mCΔT

    = 22.0 g x  2.01 J∘C−1g−1 x 45°C

    =  1989.9 J

Total energy required to  take a 22.0 g sample of liquid water at 25.0 degrees Celsius to steam at 145.0 degrees Celsius is:

   =  q1   +  q2  + q3

   =  6903.6 J  + 49744. 4 J + 1989.9 J

   = 58,637.9 J

   = 58.6379 KJ

   = 58.6 KJ

Energy is described as having the "ability to conduct work, which is the capacity to apply a force that causes an item to be displaced.

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Answer to these questions

Answer to these questions

Answers

4. The molar mass of KOH is 56.11 g/mol. Using the formula for molarity, M = moles of solute/liters of solution, we can calculate the number of moles of KOH in the solution:

moles of KOH = 112 g / 56.11 g/mol = 1.997 mol

Then, we divide the moles of KOH by the volume of the solution in liters:

M = 1.997 mol / 2.00 L = 0.999 M

Therefore, the molarity of the solution is 0.999 M, which is approximately 1.00 M.

Answer: C) 1.00 M

5. Using the same formula for molarity, we can first calculate the number of moles of KNO3 in the solution:

moles of KNO3 = 404 g / 101 g/mol = 4.00 mol

Then, we divide the moles of KNO3 by the volume of the solution in liters:

M = 4.00 mol / 2.00 L = 2.00 M

Therefore, the molarity of the solution is 2.00 M.

Answer: A) 2.00 M

6. The molar mass of KF is 58.10 g/mol. Using the same formula for molarity, we can calculate the number of moles of KF in the solution:

moles of KF = 116 g / 58.10 g/mol = 1.999 mol

Then, we divide the moles of KF by the volume of the solution in liters:

M = 1.999 mol / 1.00 L = 1.999 M

Therefore, the molarity of the solution is 1.999 M, which is approximately 2.00 M.

Answer: A) 2.00 M

7. The volume of the solution is given in milliliters, so we need to convert it to liters:

2,000 milliliters = 2.000 liters

The concentration of a solution is defined as the number of moles of solute per liter of solution. One mole of CaCl2 has a mass of 40.08 + 2(35.45) = 110.98 g. Therefore, the number of moles of CaCl2 in the solution is:

moles of CaCl2 = 1 mol

We can now calculate the concentration of the solution:

M = 1 mol / 2.000 L = 0.500 M

Therefore, the concentration of the solution is 0.500 M.

Answer: C) 0.25 M

8. The molarity of the HCl solution is given as 3.0 M. Using the formula for molarity, we can calculate the number of moles of HCl in 0.50 L of solution:

moles of HCl = M x L = 3.0 mol/L x 0.50 L = 1.5 mol

Therefore, there are 1.5 moles of HCl in 0.50 L of solution.

Answer: C) 1.5

9. We need to use the formula for molarity to determine how many moles of KOH are required to make a 2.00 M solution in 250. mL of solution:

M = moles of KOH / liters of solution

2.00 M = moles of KOH / 0.250 L

moles of KOH = 0.500 mol

Then, we can use the formula:

mass = moles x formula mass

mass of KOH = 0.500 moles x 56.0 g/mol = 28.0 g

Therefore, the answer is (C) 28.0 g.

10. According to the Solubility Guidelines chemistry reference table, the least soluble compound in water is (B) Ca3(PO4)2.

11. Based on the Solubility Guidelines chemistry reference table, the compound that will not dissolve in a saturated solution is (A) AgCl(aq).

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He following cell has a potential of 0. 45 v at 25°c. Pt(s) ∣ h2(1 atm)|h (? m) ∣∣ cl-(1 m) ∣ hg2cl2(s)|hg(l) the standard half-cell potential for the half-reaction hg2cl2(s) 2 e- → 2 hg(l) 2 cl-(aq) is 0. 28 v. What is the ph in the anode compartment?

Answers

The pH in the anode compartment is approximately 5.62.

E°cell = 0.28 V (standard cell potential)

Ecell = 0.45 V (measured cell potential)

n = 2 (number of moles of electrons transferred)

Using the Nernst equation:

Ecell = E°cell - (0.0591/n) * log(Q)

We need to determine the value of Q, which is the reaction quotient. In this case, Q can be calculated using the concentration of H+ ions.

Let's assume the concentration of H+ ions is [H+].

Plugging the values into the Nernst equation:

0.45 V = 0.28 V - (0.0591/2) * log([H+]/1 M)

0.17 V = -0.02955 * log([H+])

Dividing both sides by -0.02955:

-0.17 V / -0.02955 = log([H+])

5.752 ≈ log([H+])

Taking the antilog of both sides:

[H+] = 10^(5.752)

[H+] ≈ 4.18 × 10⁵ M

To calculate the pH, we take the negative logarithm (base 10) of [H+]:

pH = -log10([H+])

pH ≈ -log10(4.18 × 10⁵)

pH = - (log10 4.18 + log10 10⁵ )

pH = - (0.62 + 5 (1) )

pH = -5.62

pH = -5.62

Therefore, the pH in the anode compartment is approximately 5.62.

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One side of a triangle is 6 units longer than a second side. the ray bisecting the angle formed by these sides divides the opposite side into segments that are 9 units and 12 units long. find the perimeter of the triangle. give your answer as a reduced fraction or exact decimal

Answers

The perimeter of the triangle is determined as 63 units.

To get the perimeter of a triangle = sum all its three side lengths.

According to the angle-bisector theorem, if an angle bisector contacts the opposite side of a triangle, it splits the opposing side into two segments that are proportionate to the two other sides.

AB/AD = CB/CD ((angle bisector theorem).

Substitute

(x + 6)/12 = x/9

Cross multiply

3(x+6)=4x

3x+18=4x

x=18

Perimeter of Triangle = x + 6 + x + 9 + 12

now we will replace x with the value we got

Perimeter of Triangle = 18+ 6 + 18 + 9 + 12

The perimeter of the Triangle = 63 units.

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A gas has a volume of 150 cm3. Convert this volume into mL

Answers

Answer:

The answer is

150 mL

Explanation:

To convert the volume from cm³ to mL we use the conversion

1 cm³ = 1 mL

So from the question

if 1 cm³ = 1 mL

Then 150 cm³ = 150 mL

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