Which of the scenes below best represents how the ions occur in an aqueous solution of the following: (а) Li2SO4? А В C (b) CaCl2? А В C(c) NHBr? А B C

The states of matter change to produce the same or the new substance. When yeast is added to hydrogen peroxide bubble of carbon dioxide is formed which indicates chemical change.

A chemical change is the formation of a new substance by the chemical alterations in the reactants. The yeast releases products of cellular respiration that react with hydrogen peroxide.

The reaction is exothermic as it releases heat and increases the temperature when measured by the thermometer. The Fizzing and bubbling occur when carbon dioxide reacts with H₂O₂ to produce a new substance.

Therefore, addition of yeast to hydrogen peroxide is a chemical change.

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Answer:

The type of change that took place is most likely a chemical change, due to the recordable reactivity of the hydrogen peroxide to the yeast granules in the experiment.

Explanation:

As stated in the question, the hydrogen peroxide started fizzing and bubbling in reaction to the yeast granules, which is already a sign of a chemical change. The question also states that there was an increase in temperature. This is another sign of a chemical change. Hope this helped (;

Answer:

Chloroform has a boiling point of 61.15 degrees Celsius and a vapor pressure of 9.5 kPa at 20 degrees Celsius. Glycerol, on the other hand, has a boiling point of 290 degrees Celsius and a vapor pressure of 0.0002 kPa at 20 degrees Celsius. Therefore, chloroform has a much lower boiling point and a much higher vapor pressure than glycerol. This means that chloroform is more volatile and evaporates more easily than glycerol.

Explanation:

Chloroform has a boiling point of 61.15 degrees Celsius and a vapor pressure of 9.5 kPa at 20 degrees Celsius. Glycerol, on the other hand, has a boiling point of 290 degrees Celsius and a vapor pressure of 0.0002 kPa at 20 degrees Celsius. Therefore, chloroform has a much lower boiling point and a much higher vapor pressure than glycerol. This means that chloroform is more volatile and evaporates more easily than glycerol.

Answer:

Lungs.

Explanation:

They bring the blood throughout the body, to help it function properly

The molarity of the solution is 0.067 moles per liter. To calculate the molarity of the solution, you first need to determine the number of moles in the solution.

Molarity is a unit of measurement used to measure the concentration of a solution. It is defined as the amount of solute present in one liter of a solution. It is expressed as moles per liter (mol/L). In other words, molarity is the number of moles of solute in one liter of solution. This unit is commonly used in chemistry to describe the concentration of ions, molecules, or other substances dissolved in a solution. Molarity is also used to measure the strength of an acid or base, as molarity is directly proportional to the acidity or basicity of a solution. Molarity is an important concept in chemistry as it is used to calculate the amount of a given substance present in a solution.

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Answer:

Put simply, Asexual reproduction is reproduction without the use of gametes or the number of chromosomes being changed. So they are genetically identical creatures. Some animals include wasps,  lizards, sharks, turkeys, and sea urchins.

Sexual reproduction includes chromosomes and gametes being fused, creating genetically different offspring. Examples of creatures that reproduce sexually are humans, chickens, cow, pigs, etc.

Explanation:

ANSWER

option A and B

EXPLANATION

An increase in temperature will increase the average kinetic energy of the molecule, thereby increasing the frequency of collision.

The correct answer are option A and B

We can see that Trial 1 was more efficient than Trial 2, since it had a higher percentage yield. This suggests that using a smaller amount of oxygen relative to SiCl₄ is more efficient for this reaction

What is Percentage Yield?

It compares the actual yield of a reaction to the theoretical yield that would be obtained if the reaction proceeded perfectly, and expresses the result as a percentage.

To calculate the percentage yield for SiO₂ in Trial 1, we first need to determine the theoretical yield. We can do this by using stoichiometry and the amount of SiCl₄, which is the limiting reactant:

1 mole SiCl₄ reacts with 1 mole O₂ to produce 1 mole SiO₂ and 1 mole Cl₂

The molar mass of SiCl₄ is 169.9 g/mol, so 100 g of SiCl₄ is equivalent to 100/169.9 = 0.588 moles.

Since 32.96 g of O₂ was used, which has a molar mass of 32 g/mol, this is equivalent to 32.96/32 = 1.03 moles of O₂.

Since oxygen is the excess reactant, we can use the amount of SiCl₄ to calculate the theoretical yield of SiO₂:

0.588 moles SiCl₄ × 1 mole SiO₂/1 mole SiCl₄ × 60.1 g SiO₂/1 mole SiO₂ = 35.8 g SiO₂

The actual yield of SiO₂ in Trial 1 was 50 g. Therefore, the percentage yield is:

(50 g SiO₂/35.8 g SiO₂) × 100% = 139.7%

This indicates that the experiment produced more SiO₂ than was theoretically predicted. There are a number of possible reasons for this, such as experimental error or the presence of impurities in the reactants.

To determine the leftover reactant, we can use stoichiometry and the amount of SiCl₄ that was used:

0.588 moles SiCl₄ - 0.5 moles SiO₂ produced = 0.088 moles SiCl₄ remaining

The leftover reactant is equivalent to:

0.088 moles SiCl₄ × 169.9 g SiCl₄/1 mole SiCl₄ = 15 g SiCl₄

Therefore, 15 g of SiCl₄ was leftover in Trial 1.

b. We can use the percentage yield from Trial 2 to determine which ratio of reactants is more efficient. Since the amount of SiCl₄ was kept constant, the change in the yield must be due to the change in the amount of O₂. To compare the efficiency of different ratios, we can calculate the theoretical yield for each trial and compare it to the actual yield:

Trial 1: Theoretical yield of SiO₂ = 35.8 g, actual yield = 50 g, percentage yield = 139.7%

Trial 2: Theoretical yield of SiO₂ = 107.4 g, actual yield = 60 g, percentage yield = 55.8%

From these results, we can see that Trial 1 was more efficient than Trial 2, since it had a higher percentage yield. This suggests that using a smaller amount of oxygen relative to SiCl₄ is more efficient for this reaction.

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The missing variable of (⁻¹) is bromine.

Let the missing variable be X.

No. of electrons in the monoatomic anion (X⁻¹ )= 36

No. of electrons in the monoatomic atom (X) = 35

Atomic No. = No. of protons = No. of electrons in neutral atom = 35

Mass No. = No. of protons + No. of neutrons

               = 35 + 45 = 80

Hence, the element must be Br as its mass no is 80 and atomic no is 35.

And the ion is bromide ion or Br⁻¹ ion. It is an anion which gains an electron to achieve octet.

X → Br and X⁻¹ → Br⁻¹

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Answer:

chemical formula

Explanation:

Answer:

It would be around 10 grams

Explanation:

6+4

1.08 moles of theoretical compound L2E3 in 25 g of the compound.

To find the number of moles in a given mass of a compound, we need to use the formula:
moles = mass / molar mass. However, this is the number of moles of L2E3 in 25 g of the compound. We need to find the number of moles of theoretical compound L2E3.
Since the compound L2E3 has two atoms of L and three atoms of E, the number of moles of theoretical compound L2E3 will be half the number of moles of L2E3.

Molar mass of L2E3 = 2 x molar mass of L + 3 x molar mass of E
Substituting the given values, we get:
Molar mass of L2E3 = 2 x 12.19 + 3 x 8.29
Molar mass of L2E3 = 24.38 + 24.87
Molar mass of L2E3 = 49.25 g/mol
moles = mass / molar mass
moles = 25 g / 49.25 g/mol
moles = 0.5082 mol

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The phase change in this event is condensation. This process is known as condensation, where a gas changes into a liquid.

Correct option is, A.

Dew appears on a lawn in the morning because water vapor in the air cools down and changes into liquid form as it comes in contact with the cooler surface of the lawn. Wet clothes dry on a summer day because the heat from the sun causes the water in the clothes to evaporate into the air. This process is known as evaporation, where a liquid changes into a gas.

When dew appears on a lawn in the morning, it's because the air has cooled and water vapor in the air condenses into tiny water droplets on surfaces. This phase change is called condensation.
(b) Icicles changing into liquid water is an example of a solid turning into a liquid. This phase change is known as fusion or melting.
(c) When wet clothes dry on a summer day, the liquid water in the clothes evaporates into water vapor due to heat from the sun. This phase change is called evaporation.

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A line graph can show information about two or more data sets and is useful to compare them. In this example, you can compare the change in the heart rate of the two boys. You will find the graph in the attached files.

As the statement says, the line graphs can be used to compare results.

It is basically a chart showing a line connecting many data points.

It must contain two axes

→ Y ax ⇒ Dependent variable ⇒ In this example, it is the heart rate values

→ X ax ⇒ Independent variable ⇒ In this example, it is the number of times the measurements were taken.

So in this example, data about the change in heart rate was taken from two boys, John and Thabo.

Note about the data table: Since I do not know which value belongs to each boy, I drow a new table. You should use the data of your table to make a new graph.

When making the graph, you will see the difference between the boys and how the heart rate fluctuated as measurements were taken.

You can make conclusions about your results that are easier to see in the graph.

For instance, according to the attached graph, we could say that,

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Baking Soda is a substance is in nature.

Thus, An alkaline white powder called baking soda is a staple of contemporary kitchens. One significant brand is largely to blame for its rise. Dr. Austin Church and John Dwight, two brothers-in-law, joined forces to market baking soda in 1846 and baking soda.

The product was called Arm & Hammer Church & Co's bicarbonate of soda, and it was created in Dwight's kitchen. Arm & Hammer planned to demonstrate to the populace the ingredient's versatility by 1860.

They started handing out small cookbooks filled with recipes for various foods, including bread, cakes, cookies, puddings, and baking soda.

Thus, Baking Soda is a substance is in nature.

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Answer:

Option B. K = 1.3×10⁴, product favored

Explanation:

Data obtained from the question include:

O2(g) + 2SO2(g) <==> 2SO3(g)

Concentration of O2, [O2] = 0.024 M

Concentration of SO2, [SO2] = 0.015 M

Concentration of SO3, [SO3] = 0.26 M

Equilibrium constant, K =..?

The equilibrium constant, K is simply defined as the ratio of the concentration of products raised to their coefficient to the concentration of the reactants raised to their coefficient.

The equilibrium constant for the above reaction can be written as

K = [SO3]² / [O2] [SO2]²

Inputing the values of [SO3], [O2] and [SO2] the equilibrium constant, K is:

K = [SO3]² / [O2] [SO2]²

K = 0.26² / 0.024 × 0.015²

K = 1.3×10⁴

Therefore, the equilibrium constant K is 1.3×10⁴.

Since the value of the equilibrium constant, K is large and positive, therefore, the reaction favours the product.

Explanation:

To find the freezing point of the solution using the freezing point depression (ATf) and the freezing point of water, we can use the equation:

FPsolution = FPwater - ATf

where FPwater is the freezing point of pure water (0.00 °C). We know that ATf for this solution is 5.58 °C, as found in the previous step. Therefore:

FPsolution = 0.00 °C - 5.58 °C

FPsolution = -5.58 °C

However, a freezing point below zero degrees Celsius is not physically possible, since water freezes at 0.00 °C. Therefore, the solution would not actually freeze at this temperature, and we need to round the answer to zero °C:

FPsolution ≈ 0.00 °C

Therefore, the freezing point of the solution is around 0.00 °C, or the solution will not freeze at this temperature.

Answer:

Moving the balls closer together. The distance decreases and force increases.

Answer:

The cork cell

Explanation:

The complete, balanced chemical reaction for the reaction between gold (Au) and selenic acid (H2SeO4) is: 4Au + 3H2SeO4 → 2Au2(SeO4)3 + H2SO3 + H2O. The coefficients for the reactants and products are as follows: 4 for Au, 3 for H2SeO4, 2 for Au2(SeO4)3, 1 for H2SO3, and 1 for H2O. The type of chemical reaction is a single displacement reaction.

The balanced chemical equation for the reaction between gold (Au) and selenic acid (H2SeO4) is:

4Au + 3H2SeO4 → 2Au2(SeO4)3 + H2SO3 + H2O

In this equation, the coefficient in front of Au is 4, indicating that 4 moles of gold are involved in the reaction. The coefficient in front of H2SeO4 is 3, indicating that 3 moles of selenic acid are present.

On the product side, the coefficient in front of Au2(SeO4)3 is 2, indicating the formation of 2 moles of gold selenate. The coefficient in front of H2SO3 is 1, representing the formation of 1 mole of sulfurous acid. The coefficient in front of H2O is also 1, indicating the production of 1 mole of water.

Based on the reactants and products involved, the type of chemical reaction is a single displacement reaction, as gold displaces hydrogen in selenic acid to form gold selenate.

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Answer:

Next time you're just recently out of a serious relationship, and you're craving some sort of intimacy and comfort, feel confident that a rebound might actually be a good thing as long as it's an upgrade, either physically, emotionally, a fun date, or even just finding a way to shift your mentality toward viewing. so what im saying is if your happy in that relationship stay in it and if he or she becomes a meany leave it its not goo for your health

Compared to air or water, steel has the fastest sound propagation speed.

Vibrations known as sound waves travel through a medium like air, water, or solid things. As an object vibrates, the surrounding medium's molecules follow suit, causing a disturbance that travels across the medium as a wave of pressure changes. The human ear interprets these pressure changes as sound.

Solids, especially those with densely packed molecules and high densities, allow sound waves to travel the fastest. In contrast to air or water, sound waves move through steel the fastest.

In comparison to the speeds of sound in air and water, which are respectively 343 and 1,484 meters per second, respectively, in steel, the speed of sound is approximately 5,960 meters per second.

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Answer:

8.822 × 10¹³ g Co

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

9.015 × 10³⁵ atoms Co

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of Co - 58.93 g/mol

Step 3: Convert

\(9.015 \cdot 10^{35} \ atoms \ Co(\frac{1 \ mol \ Co}{6.022 \cdot 10^{23} \ atoms \ Co} )(\frac{58.93 \ g \ Co}{1 \ mol \ Co} )\) = 8.82189 × 10¹³ g Co

Step 4: Check

We are given 4 sig figs. Follow sig fig rules and round.

8.82189 × 10¹³ g Co ≈ 8.822 × 10¹³ g Co

The ion indicated by this test is \(CO_{3}^2-\), representing carbonate ions.

Based on the observation of vigorous fizzing and bubbling when 1.5 M \(H_{2}SO_{4}\) is added to the unknown solid, it suggests the presence of carbonate ions (\(CO_{3}^2-\)).

When an acid such as \(H_{2}SO_{4}\) reacts with carbonate ions, it produces carbon dioxide gas (\(CO_{2}\)) as a byproduct, which causes the fizzing and bubbling.

The reaction can be represented as follows:

\(H_{2}SO_{4}\) + \(CO_{3}^2-\) → \(CO_{2}\) + \(H_{2}O\) + \(SO_{4}^2-\)

The \(H_{2}SO_{4}\) reacts with the carbonate ions, releasing carbon dioxide gas, water, and sulfate ions. The observed fizzing and bubbling are the visible evidence of the carbon dioxide gas being evolved.

Therefore, the ion indicated by this test is \(CO_{3}^2-\), representing carbonate ions.

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Answer:

developing the atomic theory of matter

Explanation:

Answer:

The correct answer is B. 1-propanamine.

Explanation:

Amines can form hydrogen bonds with water molecules, which makes them soluble in water. The more hydrogen bonding sites an amine has, the more soluble it will be in water.

Out of the given options, 1-propanamine has only one carbon chain, which allows it to form more hydrogen bonds with water molecules compared to amine molecules with longer carbon chains. Also, it does not have any other functional groups that could interfere with hydrogen bonding. Therefore, 1-propanamine would be the most soluble in water.

Hope it helps!

Answer:

Microwaves

Explanation:

Microwaves have more energy than blue light

Among microwaves or blue light, blue light has a higher frequency. This is because blue light belongs to the visible region has a short wavelength and produces a higher amount of energy.

The frequency of any wave is inversely related to the wavelength. This means that when the frequency of the wave increases, the wavelength decreases. While the relationship between frequency is directly related to the energy.

According to the context of this question, gamma rays have the highest frequency and shorter wavelength, while radiowaves have a shorter frequency and the highest wavelength.

Therefore, blue light has a higher frequency. This is because blue light belongs to the visible region has a short wavelength and produces a higher amount of energy.

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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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Answer:

16.5gm of Sr(strontium) has 1.12 x10^23 atoms...26.5 gm of Fe(iron) has 2.84 x10^23.... 7.73 gm of Bismuth has 2.22 x10^22.....36.4gm of  Phosphorus has 7.06 x10^23

Explanation:

by the formula,

                          Moles=\(\frac{no of atoms}{Avogadro's No}\)

you could find moles by

                                      Moles = given mass/atomic mass

Put the value of moles and multiply it by Avogadro's no you will get the following answers