Manny and Eva are dissolving sugar in 10 milliliters (mL) of water. They discover that more sugar dissolves in warmer water. In order for their results to be confirmed, another group must get the same results. Which list contains tools needed to confirm Manny and Eva’s experimental results?


a) beaker, test tube, stopwatch


b) microscope, glass slide, probe


c) beaker, hand lens, eye dropper


d) graduated cylinder, thermometer, balance

a) The number of chemically non-equivalent carbons in trans-1-chloro-1-butene is 3.b) The number of chemically non-equivalent carbons in 1,4-dimethylbenzene is 4.

a) trans-1-Chloro-1-butene has 3 kinds of chemically non-equivalent carbons: one sp3 hybridized carbon bonded to the chlorine atom, one sp3 hybridized carbon bonded to two other carbon atoms, and one sp2 hybridized carbon in the double bond.b) in 1,4-dimethylbenzene, there are six carbons in the aromatic ring. The two methyl groups are attached to the first and fourth carbons, respectively. Since the aromatic ring is symmetric, the carbon atoms in the ring are chemically equivalent, and the two methyl groups are also attached to equivalent carbons. Thus, there are only two kinds of chemically non-equivalent carbons in 1,4-dimethylbenzene.

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Common state changes include melting, freezing, sublimation, deposition, condensation, and evaporation.

Substances change from one state to another as a result of changes in temperature and pressure. means that it reverts to a liquid when a pressure change is applied.

A phase change occurs when you reach a certain special point. Liquids may want to solidify. Scientists use what is called the freezing or melting point to measure the temperature at which a liquid turns into a solid. There are physical effects that can change the melting point. Pressure is one of these effects. As the pressure surrounding a substance increases, so does its freezing point and other special points. It's easier to keep things tight when the pressure is on.

In general, solids are denser than liquids because their molecules are closer together. The freezing process condenses molecules into smaller spaces.

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Some countries encourage it to maintain their population because people die and thats the truth, thats the first reason and second reason is because more population will boost their economy and business but some other country dont encourage it due to the reasons of chaos and crowds with many population.

The following actions describe deposition as flowing soil or mud due to gravity. Option D.

Sedimentation is the accumulation of sediments carried by the wind running water sea or ice. Sediments are carried as pebbles sand mud, or dissolved salts in water. A deposition is the direct transition of a substance from the gaseous state to the solid state on cooling without going through the liquid state.

Sedimentation is the geological process in which sediments soils and rocks are added to form landforms or land masses. Wind ice water and gravity cause previously weathered surface material to deposit and lose sufficient kinetic energy within the fluid to form a layer of sediment. Several factors influence how sediment settles. Sediment is removed from new surface locations. Precipitation is the change of state of a gaseous substance into a solid.

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Compared to other common sugars, The sweetest-tasting simple carbohydrate in the diet is fructose

A naturally occurring sugar called fructose can be found in a variety of fruits, vegetables, and honey.

Compared to other common sugars like glucose and sucrose (table sugar), it is sweeter.

Fructose is quickly absorbed into the bloodstream after consumption and can serve as a quick source of energy.

Due to its extreme sweetness, it is frequently employed as a sweetener in many processed foods and beverages.

High-fructose corn syrup is a commercial sweetener with a considerable fructose content that is frequently used in sodas and other sweetened beverages.

Therefore, fructose is the sweetest simple carbohydrate.

Option C) fructose is the correct answer.

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Answer:

dang this hard I don't understand...

The choice of mixture will depend on the specific goals of the experiment and the chemical properties of the substances being used. It is important to carefully consider these factors before choosing the appropriate mixture for the acid/base reaction.

When deciding on an acid/base reaction, it is important to choose the appropriate mixture for the experiment. The mixture chosen will depend on the specific reaction being conducted and the desired outcome.

For example, if the goal of the experiment is to neutralize an acid, a basic solution would be the appropriate mixture. This is because the basic solution will react with the acid to form water and a salt, neutralizing the acid.

On the other hand, if the goal of the experiment is to create a chemical reaction, an acid solution may be the appropriate mixture. This is because the acid will react with a base to form a salt and water, creating a chemical reaction.

Overall, the choice of mixture will depend on the specific goals of the experiment and the chemical properties of the substances being used. It is important to carefully consider these factors before choosing the appropriate mixture for the acid/base reaction.

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Answer:

''The relationship between air pressure, air density, or altitude? As altitude increases, pressure increases. As altitude increases, air density increases. Air pressure and density are lowest at sea level.''

Explanation:

Answer:

C. Al2O3

Explanation:

The empirical formula is an expression that represents the simplest proportion in which the atoms that form a chemical compound are present. It is therefore the simplest representation of a compound.

For options A, B and D the empirical formulas are as follows:

A. CH2

B. BH3

D. CH

Answer:

This question is incomplete

Explanation:

This question is incomplete but one can assume the answer from the definition of quantum mechanics. Quantum mechanics is the science that describes particles in nature at the atomic and subatomic particle (electron, proton and neutron) level. Thus it can be assumed that atoms and subatomic particles are used to broadly describe particles.

a. The equilibrium constant for the reaction at 25 °C from the reaction A(aq) ⥫⥬  enzyme B (aq) and the Δ° of the reaction is -5.540 kJ·mol⁻¹ is 2.98 × 10³.

b. The Δ for the reaction at body temperature (37.0 °C) if the concentration of A is 1.5 M and the concentration of B is 0.60 M is  -8.020 kJ·mol⁻¹.

To calculate the equilibrium constant (K'eq) for the reaction at 25°C, we have the relation:

Δ° = -RT ln K'eq

Where R is the universal gas constant, T is the temperature in Kelvin, and ln is the natural logarithm.

Therefore, K'eq = e-Δ°′/RT

Substituting the given values, we have:

K'eq = e-(-5540 J/mol)/(8.314 J/mol K × 298 K)

= 2.98 × 10³

The Δ for the reaction at body temperature (37.0 °C) is given by the relation:

Δ = Δ° + RT ln(Q)

where Q is the reaction quotient at the given concentration of reactants and products.

Q = [B] / [A] = 0.60 / 1.5 = 0.4

Substituting the given values, we have:

Δ = -5540 J/mol + (8.314 J/mol K × 310 K) ln (0.4)

= -8020 J/mol

Therefore, the Δ for the reaction at body temperature is -8.020 kJ·mol⁻¹.

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C) 202.6 kPa; 405.2 kPa

When Carl and his lab partner force the gases into a smaller, 1 liter container, the total pressure exerted on the container will increase based on Boyle's Law. Boyle's Law states that the pressure and volume of a gas are inversely proportional at constant temperature.

Since the original total pressure of each gas is 101.3 kPa, the new total pressure in the smaller container will be double that amount, resulting in 202.6 kPa. This eliminates options A and B.

The partial pressure of each gas will remain the same as before, even when the volume changes. This is because the gases are confined to the same volume ratio within the new container. Therefore, the new partial pressure of each gas will still be 101.3 kPa.

So, the correct answer is:

C) 202.6 kPa; 405.2 kPa

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question

mass = 100 g

volume = 20 cm³

We have

\(density = \frac{100}{20} = \frac{10}{2} \\ \)

We have the final answer as

Hope this helps you

Answer:

Metallic Bonding

Explanation:

Metallic Bonding

In metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize. That is to say, instead of orbiting their respective metal atoms, they form a “sea” of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions.

Free energy change for transporting Ca2+ ions is calculated as follows:∆G = RT ln ([Ca2+]outside/[Ca2+]inside)∆G = 8.315 J/mol.K x 310 K x ln (25 mM/145 mM) = -15,400 J/mol.

Here, ∆G is negative, which implies that Ca2+ ions transport spontaneously from the cell to blood. This is because the free energy of the system decreases when Ca2+ ions move from high concentration to low concentration. Therefore, transporting Ca2+ ions is energetically favorable.

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In a first-order reaction, it takes 23.02 days for 68 percent of the chemical to be destroyed.

Given,

fee constant for the destruction of pollutant = 0.1/day

We ought to discover the number of days it'll take for sixty eight percent of the chemical to be destroyed.

[A] = [A]₀e^⁻kt

in which [A] is the present awareness, and

[A]₀ is the initial awareness

k is the price of decrement

[A]₀ = 1

[A] = 0.1

Or, t =㏑(10)/k

Or, t = 2.302/zero.1

Or, t = 23.02 days.

for this reason the wide variety of days required for the destruction of sixty eight percent of chemicals is 23 days.

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1.  We have to divide the coefficient of equation I by 2 to get equation II.

a. Both equations are balanced but equation II is the correct way to write a

balance equation.

b. It will be correct if we divide equation II coefficient by another factor

but  we will get fractions as coefficient. For example

\(\frac{1}{2}\)SnO₂ + H₂→  \(\frac{1}{2}\)Sn + H₂O

c. The correct method is checking if the number of moles of element on

the reactant side is same as the those on the product side. And the

conventional way is making sure the coefficients are whole numbers.

i.   2SnO₂ + 4H₂ → 2 Sn + 4H₂O

ii.  SnO₂ + 2H₂→  Sn + 2H₂O

We have to divide the coefficient of equation I by 2 to get equation II.

Both equations are balanced but equation II is the correct way to write a

balance equation.

If we divide the coefficients of equation II by another number, we will not

get a whole number coefficients. The coefficient will be fractions , it will

be  correct but its not conventional.  

The best method to know if equation is written the correct way is checking

if the coefficient are in the lowest whole number factors.

we also have to check if each moles of elements found in the reactant is

the same in the product side.

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Answer:We have to divide the coefficient of equation I by 2 to get equation II.

Explanation:

1. Atomic masses:

Iron (Fe) - 55.845

Sulfur (S) - 32.06

Oxygen (O) - 15.999

2. FeSO3 has:

1 Fe atom = 55.845

1 S atom = 32.06

3 O atoms = 3 * 15.999 = 47.997

3. Add up the atomic masses:

55.845 + 32.06 + 47.997 = 135.902

4. Therefore, the molar mass of FeSO3 is 135.902 grams/mole.

In terms of atoms, the formula FeSO3 shows:

1 Fe atom

1 S atom

3 O atoms

So there are 5 atoms total in each molecule of ferric sulfite (FeSO3).

Let me know if you have any other questions!

The formula for iron pyrite, also known as fool's gold, is \(FeS2.\)

This means that it consists of one iron atom and two sulfur atoms. It is called fool's gold because it has a metallic luster and is often mistaken for real gold by amateur gold miners. Iron pyrite is an important mineral as it is a source of sulfur and also contains iron, which is a valuable metal used in many industries.

However, it is not considered a reliable source of iron as it often contains impurities and is difficult to extract. In addition, it can also cause environmental problems if not properly managed as it can release sulfuric acid when exposed to air and water.

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1. The equation is not balanced. The balanced equation is \(4NH_3 + 5O_2 --- > 4NO +6 H_2O\)

2. The equation is balanced.

3. The equation is not balanced. The balanced version is \(2H_2O --- > 2H_2 + O_2\)

A balanced chemical equation usually has the same number of atoms of different elements in the reactants and the products, even though the forms of the atoms might have changed.

Consider the first equation: \(NH_3 + O_2 --- > NO + H_2O\)

The number of hydrogen atoms is not balanced. Thus, the equation that shows balanced atoms of different elements would be: \(4NH_3 + 5O_2 --- > 4NO +6 H_2O\)

Consider the second equation: \(N_2 + 3H_2 -- > 2NH_3\)

There are 2 atoms of nitrogen in the reactants and there are also 2 in the product. The number of hydrogen atoms is 6 in the reactants and 6 in the products. Thus, it is a balanced equation.

Consider the third equation: \(2H_2O --- > H_2 + O_2\)

There are 4 hydrogen atoms in the reactant and only 2 in the products. The balanced equation would be: \(2H_2O --- > 2H_2 + O_2\)

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The new pressure of the gas is approximately 838.74 torr.

To determine the new pressure of the gas, we can use Boyle's Law, which states that the pressure and volume of a gas are inversely proportional when the temperature remains constant.

According to Boyle's Law, P1 * V1 = P2 * V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.

Given:

Initial volume (V1) = 516 ml

Initial pressure (P1) = 345 torr

Final volume (V2) = 213 ml

Using the formula and plugging in the values:

345 torr * 516 ml = P2 * 213 ml

Simplifying the equation:

P2 = (345 torr * 516 ml) / 213 ml

Calculating the value:

P2 ≈ 838.74 torr

Therefore, the gas now has a pressure of approximately 838.74 torr.

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Answer:

Sodium and chlorine combine to make salt

Explanation:

Answer:

vinegar and soda

Explanation:

:)

When immerse the egg in the vinegar then we see 'bubbles on the shell'

Here given data is when we immerse the egg in the vinegar then soak this egg shell in vinegar and in that chemical reaction will start because in vinegar acetic acid are seen and that dissolve calcium carbonate shell and  the acetic acid reacts with the calcium carbonate in the egg shell and releases carbon dioxide gas that you see as bubbles on the shell after an hour we will back then egg shell are soaked by vinegar

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Answer:

165.3 cm^3

Explanation: hope this is correct!!

P1 * V1 / T1 = P2 * V2 / T2

P1 = 84.6 kPa

V1 = 215 cm³

T1 = 23.5°C = 23.5 + 273 K = 296.5 K

At STP:

P2 = 101.3 kPa

V2 = ?

T2 = 273 K

Taking into account the definition of molarity and the reaction stoichiometry:

In first place, the balanced reaction is:

NiCl₂ + 2 NaOH  → Ni(OH)₂ + 2 NaCl

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

molarity= number of moles of solute÷ volume

Molarity is expressed in units moles/L.

First, you have 26.0 mL(0.026 L) of a 0.420 M NiCl₂. Replacing in the definition of molarity:

0.420 M= number of moles of NiCl₂÷ 0.026 L

Solving:

0.420 M× 0.026 L= number of moles of NiCl₂

0.01092 moles= number of moles of NiCl₂

Now, the following rule of three can be applied: If by reaction stoichiometry 1 mole of NiCl₂ react with 2 moles of NaOH, 0.01092 moles of NiCl₂ react with how many moles of NaOH?

moles of NaOH= (0.01092 moles of NiCl₂×2 moles of NaOH)÷1 mole of NiCl₂

moles of NaOH= 0.02184 moles

If you have a solution of 0.200 M NaOH, replacing in the definition of molarity you get:

0.200 M= 0.02184 moles÷ Volume of NaOH

Solving:

0.200 M×Volume of NaOH= 0.02184 moles

Volume of NaOH= 0.02184 moles ÷0.200 M

Volume of NaOH= 0.1092 L= 109.2 mL

Finally, a volume of 109.2 mL of 0.200 M NaOH solution are needed.

First, you have 48.0 mL(0.048 L) of a 1.80 M NaOH. Replacing in the definition of molarity:

1.80 M= number of moles of NaOH÷ 0.048 L

Solving:

1.80 M× 0.048 L= number of moles of NaOH

0.0864 moles= number of moles of NaOH

Now, the following rule of three can be applied: if by reaction stoichiometry 2 moles of NaOH form 92.7 grams of Ni(OH)₂, 0.0864 moles of NaOH form how much mass of Ni(OH)₂?

mass of Ni(OH)₂= (0.0864 moles of NaOH×92.7 grams of Ni(OH)₂)÷2 moles of NaOH

mass of Ni(OH)₂= 4.00464 grams

Finally, 4.00464 grams of Ni(OH)₂ are formed from the reaction of 48.0 mL of a 1.80 M NaOH solution and excess NiCl₂.

First, you have 11.3 mL(0.0113 L) of a 0.360 M NaOH. Replacing in the definition of molarity:

0.360 M= number of moles of NaOH÷ 0.0113 L

Solving:

0.360 M× 0.0113 L= number of moles of NaOH

0.004068 moles= number of moles of NaOH

Now, the following rule of three can be applied: If by reaction stoichiometry 2 moles of NaOH react with 1 mole of NiCl₂, 0.004098 moles of NaOH react with how many moles of NiCl₂?

moles of NiCl₂= (0.004098 moles of NaOH×1 mole of NiCl₂)÷2 moles of NaOH

moles of NiCl₂= 0.002034 moles

If you have 30 mL (0.030 L) NaOH, replacing in the definition of molarity you get:

Molarity= 0.002034 moles÷ 0.030 L

Solving:

Molarity= 0.0678 moles/L= 0.0678 M

Finally, the molarity of 30.0 mL of a NiCl₂ solution is 0.0678 M.

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The number of elements necessary to form all the solids, liquids, and gases around us is approximately 90.

Elements are the building blocks of matter, and they cannot be broken down into simpler substances through chemical reactions. The periodic table is a chart that organizes all the known elements based on their atomic number, which represents the number of protons in the nucleus of an atom.
The periodic table currently consists of 118 elements, but not all of them are naturally occurring. Of these, around 90 elements are commonly found in nature and are responsible for the vast array of materials and substances we encounter every day.

Each element has its own unique properties, including its atomic structure and the way it interacts with other elements. These properties determine the characteristics of the substances formed when elements combine.
So, approximately 90 elements are necessary to form all the solids, liquids, and gases around us. It is important to note that this number may vary slightly depending on the specific context and the types of materials being considered.

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