A little boy places an ice cube in his hot bowl of stew and then walks out of the room. When he returns, the ice cube is gone.
Based on the law of conservation of mass, what happened to the ice cube in the scenario?

a. The extreme temperature difference between the stew and the ice cube caused the ice cube's mass to be converted into energy.

b. The extreme temperature difference between the stew and the ice cube caused the stew's mass to destroy the ice cube's mass.

c. The extreme temperature difference between the stew and the ice cube caused the ice cube to change state while its mass remains the same or constant.

d. The extreme temperature difference between the stew and the ice cube caused the ice cube's mass to shrink to a barely noticeable amount.

To prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.The ratio of benzoic acid to sodium benzoate in the buffer solution using the Henderson-Hasselbalch equation.

To prepare a pH 4.00 buffer solution using benzoic acid and sodium benzoate, we need to calculate the appropriate volumes of the 0.100 M benzoic acid and 0.240 M sodium benzoate solutions.

First, we need to determine the ratio of benzoic acid to sodium benzoate in the buffer solution. The Henderson-Hasselbalch equation can help us with this calculation:

pH = pKa + log([A-]/[HA])

Given that the pH is 4.00 and pKa is 4.20, we can rearrange the equation:

log([A-]/[HA]) = pH - pKa

log([A-]/[HA]) = 4.00 - 4.20

log([A-]/[HA]) = -0.20

Next, we take the antilog of -0.20 to find the ratio of [A-] to [HA]:

[A-]/[HA] = antilog(-0.20)

[A-]/[HA] = 0.63

The ratio of [A-] to [HA] is 0.63.

Now, let's calculate the volumes of each solution needed. Let's assume x represents the volume (in mL) of the 0.100 M benzoic acid solution and y represents the volume (in mL) of the 0.240 M sodium benzoate solution.

Since the total volume is 100.0 mL, we have the equation: x + y = 100

Considering the ratio of [A-] to [HA] as 0.63, we can write the equation: y/x = 0.63

Solving these two equations simultaneously will give us the volumes of each solution:

x + y = 100

y/x = 0.63

By substituting y = 0.63x from the second equation into the first equation, we get:

x + 0.63x = 100

1.63x = 100

x = 61.35 mL (rounded to two decimal places)

Substituting this value back into the equation x + y = 100, we find:

61.35 + y = 100

y = 38.65 mL (rounded to two decimal places)

Therefore, to prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.

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Answer:

3s^1 would be 3s^2

Explanation:

Answer:

d = distance traveled by her on her bicycle on a long flat road = 24 kilometer

t = time taken by her to travel distance "d" on her bicycle on a long flat road = 1.2 hours

v = average speed of vivian = ?

we know that average speed is given as

v = d/t

inserting the values in the above formula

v = 24 kilometer / 1.2 hour

v = 20 kilometer/hour

hence the correct choice is

C) 20 km/h

0.886 g or 0.0054 moles of calcium nitrate decomposes to form 0.0108 moles of nitrogen dioxide gas and 0.0027 moles of oxygen. Hence, the total volume of gases is 0.32 dm³.

Calcium nitrate is an inorganic ionic compound. It easily decomposes into solid calcium oxide, nitrogen dioxide and oxygen gas.

As per the reaction, 2 moles of calcium nitrate gives 4 moles of NO₂ and tone mole of O₂.

molar mass of calcium nitrate = 164 g/mol

no.of moles of 0.886 g of calcium nitrate = 0.886 /164 = 0.0054 moles.

0.0054 moles of calcium nitrate gives:

0.0054 × 4/2 = 0.0108 moles of NO₂ .

volume in one mole = 24 dm³

volume of 0.0108 moles = 0.25 dm³

0.0054 moles of calcium nitrate gives:

0.0054 × 1/2 =0.0027 moles of O₂ .

volume of 0.0027  moles =0.0027 × 24 = 0.064 dm³

then total volume = 0.064 + 0.0027 = 0.32 dm³.

Therefore, the total volume of the gases produced in the decomposition is 0.32 dm³.

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Answer:

They vibrate about a fixed position

The law of conservation of mass states that the total mass of a system remains constant, regardless of the changes that occur within the system. This means that the total mass of the products of a physical change must be equal to the total mass of the reactants.

For example, consider the process of melting a block of ice. When the ice melts, it changes from a solid to a liquid, but its total mass remains the same. The mass of the water that results from the melting of the ice must be equal to the mass of the ice that was present before the change.

Similarly, other physical changes such as evaporation, condensation, sublimation, and freezing also follow the law of conservation of mass. In each of these processes, the total mass of the system remains constant, even though the physical state of the substance changes.

In conclusion, the law of conservation of mass applies to physical changes as well as chemical reactions, and requires that the total mass of the system remains constant, regardless of the changes that occur within the system.

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Answer: Science : Chemistry, astronomy , biology , physics , biology ,geology. Notscience : Astrology and theology

Explanation: Astrology and theology are non scientific areas of study.

Answer:

Electron, as it carries a negative charge

Explanation:

The molarity of aqueous potassium hydroxide (KOH) can be calculated using the given information.

First, we need to determine the number of moles of phosphoric acid (H3PO4) used in the reaction. We can use the formula:  

moles = volume (L) × concentration (mol/L)

Given that the volume is 25.0 mL and the concentration is 0.100 M, we can calculate the number of moles of H3PO4 as follows:
moles H3PO4 = 0.0250 L × 0.100 mol/L = 0.00250 mol

According to the balanced chemical equation, 1 mole of H3PO4 reacts with 3 moles of KOH. Therefore, the number of moles of KOH can be determined:
moles KOH = 3 × moles H3PO4 = 3 × 0.00250 mol = 0.00750 mol

Next, we need to calculate the molarity of KOH. Molarity is defined as the number of moles of solute divided by the volume of the solution in liters.
volume KOH = 42.5 mL = 0.0425 L
molarity KOH = moles KOH / volume KOH = 0.00750 mol / 0.0425 L = 0.176 M
Therefore, the molarity of the aqueous potassium hydroxide (KOH) solution is 0.176 M.

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A.the force between two non polar molecules are stronger than the force between positive ions and freely moving electrons

No. they can't give the same pH value because pH meter will give only the single value and  pH paper and  indicator  can  give  slightly  more or  less value  compared to  pH  meter.

A pH paper is defined as a piece of paper used to find out if a solution is basic, acidic or neutral. The pH is determined by dipping part of the paper into a solution and observing the color changes. This  changes color in different solutions due to the chemical flavin. A universal indicator is defined as a pH indicator composed of a solution of several compounds that exhibits several smooth color changes over a pH value range from 0 to 14 to indicate the acidity or alkalinity of solutions, where 7 indicates neutral. If we evaluating the pond water, the tap water, the baking soda solution, and the soil sample, pH meter, pH paper and universal indicator doesn't give the same value. pH meter will give  only  single pH value.  but  if  we use  pH paper and universal indicator  they  will give  range  of pH value  not  single  value  so  paper and  indicator  can  give  slightly  more or  less value  compared to  pH  meter.

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Approximately 0.15 moles of iodine were consumed in the reaction. Use the stoichiometry of the balanced equation to find the moles of iodine.

To find the moles of iodine consumed in the reaction, we can use the given heat absorbed and the heat of the reaction (AH). The heat absorbed is given as 7.93x10 J, which we need to convert to kilojoules (kJ) by dividing it by 1000.

7.93x10 J ÷ 1000 = 7.93x10 kJ

Now, we can use the stoichiometry of the balanced equation to relate the heat of the reaction (53.0 kJ) to the moles of iodine consumed. According to the balanced equation:

H₂ (g) + I₂ (s) → 2 HI (g)

The stoichiometric coefficient in front of I₂ is 1, which means that 1 mole of iodine is consumed in the reaction.

Using the ratio of heat of reaction to moles of iodine, we can set up a proportion:

53.0 kJ ÷ 1 mole of iodine = 7.93x10 kJ ÷ x moles of iodine

Cross-multiplying and solving for x, we get:

x = (7.93x10 kJ)(1 mole of iodine) ÷ 53.0 kJ

x ≈ 0.15 moles of iodine

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Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 12 × 5

We have the final answer as

Hope this helps you

Answer:

Heat

Explanation:

Properties of elements within a period on the periodic table change in a predictable way from one side of the table to the other

From one side of the periodic table to the other, properties of elements within a period vary in a predictable manner. A horizontal row represents a period in the periodic table. The number of electron shells is the same for every atom in a row. Moving through a period causes elements to acquire electrons and protons and become less metallic. -Elements in the same period have the same number of electron shells.

As the atomic number rises, comparable features reoccur on a regular basis, which is reflected in this arrangement. From one side of the periodic table to the other, properties of elements within a blank shift in a predictable manner. those with comparable qualities are displayed in a column.

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A water and lithium bromide solution that is exposed to air becomes hygroscopic.

Hygroscopic substances have a strong affinity for water and readily absorb moisture from the surrounding environment, including air. Lithium bromide is known to be a hygroscopic compound, meaning it attracts and absorbs water molecules from the air.

When a water and lithium bromide solution is exposed to air, the hygroscopic nature of lithium bromide causes the solution to absorb water vapor from the air, resulting in an increase in the water content of the solution. This absorption of moisture can lead to the solution becoming more concentrated over time.

The hygroscopic property of lithium bromide is often utilized in air conditioning systems, where the solution is used as an absorbent to remove moisture from the air.

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The Le Chatelier Principle predicts that increasing the concentration of NH₃ will shift the reaction to the left.

Reaction is the process of responding to an event or stimulus. It can be a physical response such as movement, a mental response such as a thought or emotion, or a combination of both. Reactions can be positive, negative, or neutral, depending on the event or stimulus to which the reaction is being made. For example, a person may smile when greeted by a friend, or may become angry if insulted. Reactions can also be instinctive, such as a reflex action or a conditioned response. Reactions can be studied in terms of neuroscience and psychology, as an important part of understanding human behavior.

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Answer:

Photo?

Explanation:

Explanation:

H is hydrogen and Na is sodium.

Hydrogen is the first element of the periodic table. Its atomic no is 1. Its atomic weight is 1.008. Its electronic configuration is 1s¹.

Na is hydrogen. It lies at 3rd period and 1st group. Its atomic number is 11. Its atomic weight is 22.989769 u. Its electronic configuration is 2,8,1.

A chemist adds 1.80 l of a 3.27 x 10⁻⁵ mm silver oxide ag o solution to a reaction flask, the micromoles of silver oxide the chemist has added to the flask is 58.86 micromoles.

To calculate the micromoles of silver oxide added to the flask, we need to use the given information: the volume of the solution and the concentration of silver oxide.

Volume of the solution = 1.80 L

Concentration of silver oxide = 3.27 x 10⁻⁵ mmol/L

1 liter is equal to 1000 milliliters, so we can convert the volume as follows:

1.80 L × 1000 mL/L = 1800 mL

Now we have the volume of the solution in milliliters.

To convert millimoles to micromoles, we multiply by a factor of 1000. Since we are converting from mmol/L to µmol/mL, we can convert the concentration as follows:

3.27 x 10⁻⁵ mmol/L = 3.27 x 10⁻² µmol/mL

To calculate the micromoles of silver oxide added to the flask, we multiply the volume in milliliters by the concentration in micromoles per milliliter.

1800 mL × 3.27 x 10⁻² µmol/mL = 58.86 µmol

Therefore, the chemist has added approximately 58.86 micromoles of silver oxide to the flask.

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Answer:

all

Explanation:

because they all are someone related to climate change

Answer:

your awnser would be expanding glaciers.

Explanation:

have a nice day hope this helps

The statement that best defends Jada's conclusion is:

I. Gases are always produced when the substances undergo the chemical change.

When substances undergo a chemical change, their atoms are rearranged into new compounds with different properties. In some cases, the chemical reaction can produce a gas as one of the products. This gas may escape into the surrounding environment and cannot be accounted for in the measurement of the final mass of the mixture.

Statements F and G are both related to the conservation laws of mass and energy, respectively, and while important in chemistry, they do not directly address the observation of gas production in this experiment.

Statement H is incorrect because solids can undergo physical changes, such as melting or evaporating, without being destroyed.

Therefore, statement I is the most appropriate explanation for the observation made by Jada, and it best defends her conclusion that a gas was produced and escaped into the air during the chemical reaction between baking soda and vinegar.

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Answer: Copper is purified by electrolysis . Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate. The anode (positive electrode ) is made from impure copper and the cathode (negative electrode) is made from pure copper. Pure copper forms on the cathode.

Answer:

Systems thinking allows us to understand all the parts that make up the whole system.

Explanation:

Just took the test

The systems thinking important because, Systems thinking allows us to understand all the parts that make up the whole system. Therefore, option C is correct.

By considering the world's complexity in terms of links and entire rather than breaking it down into its component components, systems thinking helps us make sense of how complicated the world is. It has been applied as a method for investigating and producing efficient action in challenging situations.

By using a deeper grasp of the surrounding structure and its constituent parts rather than relying just on previous events, systems thinking gives a technique to more accurately forecast future outcomes.

Systems thinking is a discipline in management that focuses on understanding a system by looking at the connections and interactions between the different parts that make up the entire of that defined system. The concept of the "entire system" is a way of looking at an entire organization in relation to its surroundings.

Thus, option C is correct.

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The colour shift that occurs when tap water is added to a glass with wine residue is caused by a chemical reaction between the anthocyanin pigments in the wine and the calcium and magnesium ions that are dissolved in the water.

The H⁺ ion concentration's negative logarithm is known as pH. As a result, the meaning of pH is justified as the strength of hydrogen.

The color change observed when tap water is added to a glass containing wine residue is due to a chemical reaction that occurs between the wine and the tap water. Specifically, the tap water contains dissolved ions, such as calcium and magnesium ions, which can react with the pigments in the red wine to form a precipitate.

Red wine contains anthocyanin pigments, which are responsible for the deep red color. When the tap water is added, the calcium and magnesium ions in the water react with the anthocyanin pigments to form a complex. This complex has a blue color, which causes the color change observed by the student.

The reaction between the calcium and magnesium ions and the anthocyanin pigments is pH-dependent. At a low pH, the anthocyanins are red in color. However, when the pH increases, the anthocyanins lose their red color and become blue. This is because the anthocyanin molecule contains a chromophore group that absorbs light at different wavelengths depending on the pH of the solution.

In summary, the color change observed when tap water is added to a glass containing wine residue is due to a chemical reaction between the dissolved calcium and magnesium ions in the water and the anthocyanin pigments in the wine. This reaction forms a blue-colored complex, which causes the color change. The pH of the solution also plays a role in the color change, as the anthocyanin pigments are pH-sensitive and change color depending on the pH of the solution.

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Answer:

Wave

Explanation: