Which choice is not true of a liquid in a glass capillary with a convex meniscus?The liquid has strong cohesive forces.The liquid level will be lower inside the capillary when a capillary is inserted into a bowl of the liquid.The liquid will have a convex meniscus as it moves in the capillary.The behavior of the liquid is driven by strong interactions with the capillary glass.

Answer:

the changes are physical changes

The reason I have to think about the polarity of the different ingredients in my salad dressing in order for it to turn out well is simply because so that the soluble ingredients can dissolve completely and have a nice taste.

Polarity can simply be defined as a state of an atom or a molecule inherent in a body that exhibits opposite properties or powers in opposite parts or directions.

So therefore, the reason I have to think about the polarity of the different ingredients in my salad dressing in order for it to turn out well is simply because so that the soluble ingredients can dissolve completely and have a nice taste.

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Answer:

C

Explanation:

It starts with one reactant to give and create new compounds as a product. They need a source of energy that can be heat, light, or electricity to break up chemical bonds.

Answer:

The addition of energy in the form of heat or electricity is often required.

Explanation:

A decomposition reaction is a chemical reaction that starts with single reactants to give new compounds as the products. These reaction requires a source of energy that could be light, heat  or electricity to facilitate the breaking-down of the chemical bonds.

You would need to descend approximately 10.2 meters under the surface of pure water for the pressure to increase by 1 atmosphere.

To determine the depth under the surface of pure water where the pressure increases by 1 atmosphere (1 atm ≈ 10^5 Pa), we can use the concept of hydrostatic pressure and the equation for pressure in a fluid.

The hydrostatic pressure in a fluid is given by the equation:

P = ρgh

where P is the pressure, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the depth.

In this case, we are considering pure water, which has a density of approximately 1000 kg/m³, and we want to find the depth where the pressure increases by 1 atmosphere (10^5 Pa).

First, we need to convert the pressure from atmospheres to Pascals:

1 atm = 1 × 10⁵ Pa

Next, we can rearrange the equation for pressure to solve for the depth:

h = P / (ρg)

Putting in the values, we have:

h = (1 × 10⁵ Pa) / (1000 kg/m³ × 9.8 m/s²)

Calculating this expression gives us:

h ≈ 10.2 meters

Therefore, you would need to descend approximately 10.2 meters under the surface of pure water for the pressure to increase by 1 atmosphere.

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Answer:

Easy 46 million turkeys

Medium three days

Hard: 1934

Fun: The first President on record issuing a "pardon" to his turkey was Ronald Reagan.

Explanation:

hop tis helped

Explanation:

The reaction rate decreases with a decrease in temperature. Catalysts can lower the activation energy and increase the reaction rate without being consumed in the reaction. Differences in the inherent structures of reactants can lead to differences in reaction rates.

Answer:

This is called "evaporation" when a liquid is boiling hot, it starts to evaporate. That is how clouds form! Every liquid is able to evaporate because when it's heated up, it turns into gas. That gas is vapor.

Explanation:

common sense

The  moles of Ag formed from 91.8 moles of calcium and 41.2 moles of silver nitrate. The balanced formula: Ca(NO3)2 + 2AgCl = 2AgNO3 + CaCl2.

In the balanced equation, the reaction between 2 moles of AgNO3 and CaCl2 yields 2 moles of AgCl.

AgNO3 and AgCl have a molar ratio of 1:1.

The amount of AgCl generated is 18 moles if there are 18 moles of AgNO3 for the reaction with CaCl2.

In this case  41.2 moles of silver nitrate will give,

41.2 ×2

= 82.4 moles of Ag

In the International System of Units, a substance's amount is measured in moles, which are denoted by the sign mol. The quantity of a substance is a measurement of the number of elementary entities of a specific substance present in an object or sample.

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Answer:

The one major change that occurred was the placement and organization of the electron.

I o pe its helps u

Answer:

Sample Response: The one major change that occurred was the placement and organization of the electron. Rutherford’s model identified that the electrons were at a distance from the nucleus, Bohr’s model identified that the electrons occurred at levels that related to their available energy, and the modern atomic model shows that electrons are located in a predicted area but cannot be identified in a specific point.

Explanation:

edge 2022

Answer:

Chemical change

Explanation:

If two types of matter reacts or are combined and energy is given off, the type of change that might have occurred is a chemical change.

A chemical change is one in which a new kind of matter is formed.

It is always accompanied by energy changes.

The process is not easily reversible.

Answer:

d

Explanation:

Answer:

the answer is b,the answer has to be even though I'm not very sure about it

Radioactivity is the property exhibited by some unstable atoms of

elements in which from their nucleus radiation energy and subatomic

particles are simultaneously emitted.

Reason:

Known parameters:

The number of hours the sample is left, t = 3,198 hours

The given mass of radium, N₀ = 0.840 g

Required:

The mass of the fraction of the 0.840 g sample that remains after 3,198 hours.

Solution;

The half life of radium, \(t_{1/2}\) = 1,600 years = 14,025,600 hours

The formula for finding the amount of a radioactive substance is remaining

after a given time, t, is given as follows;

Therefore;

\(N(t) = 0.840 \times \left (\dfrac{1}{2} \right )^{\dfrac{3198}{14,025,600}} \approx 0.839867\)

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Answer:  A change in the first second and third

Explanation:

An electron in the lowest energy state is called as ground state and is also known as stable energy level.  An electron in the upper energy state is called as excited state and is also known as unstable energy level.

Electronic configuration represents the total number of electrons that a neutral element contains. The electrons are filled according to Afbau's rule in order of increasing energies. As the atomic number of sodium is 11. The electronic configuration of sodium will be represented in ground state as:

\(Na:11:1s^22s^22p^63s^1\)

Thus any electron if occupies a higher shell, the atom is said to be in excited state.

I think its 5) formation of fumes

I hope this helped :)

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

The composition of the product gas on a water-free basis is 50% ethylene and 50% hydrogen.

The balanced chemical equation for the dehydrogenation of ethane is:

C₂H₆(g) → C₂H₄(g) + H₂(g)

The feed includes 0.5 mol of steam (an inert diluent) per mole of ethane, so the initial composition of the feed is:

0.5 mol C₂H₆

0.5 mol steam

The steam is an inert diluent, so it does not participate in the reaction. The equilibrium constant for the reaction at 1100 K is 1.23.

The equilibrium constant for the reaction is:

K = [C₂H₄][H₂] / [C₂H₆]

Substituting the equilibrium concentrations from the ICE table, we get:

1.23 = x² / (0.5 - x)

Solving for x, we get:

x = 0.2309

The mole fraction of ethylene in the product gas on a water-free basis is:

x / (0.5 - x) = 0.2309 / (0.5 - 0.2309) = 0.5

Therefore, the composition of the product gas on a water-free basis is 50% ethylene and 50% hydrogen.

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To oxidize 10 g of cyclohexanol, 200 mL of 5.0% w/v bleach (NaOCl) is needed.

Before calculating the volume of bleach, we need to find:

\(Mass of cyclohexanol = 10 g\\Concentration of bleach (NaOCl) = 5.0\% w/v\\Convert the mass of cyclohexanol to moles.\\Molar mass of cyclohexanol (C6H12O) = 100.16 g/mol\\Moles of cyclohexanol = mass / molar mass\\Moles of cyclohexanol = 10 g / 100.16 g/mol\)

Determine the stoichiometry between cyclohexanol and bleach.

From the balanced equation for the oxidation of cyclohexanol, we know that:

1 mole of cyclohexanol reacts with 1 mole of bleach (NaOCl)

Calculate the moles of bleach required.

\(Moles\ of\ bleach\ (NaOCl) = moles\ of\ cyclohexanol\)

Calculate the volume of bleach using its concentration.

\(Volume\ (in\ mL) of\ bleach = (moles\ of\ bleach / concentration\ of\ bleach) * 1000\\Volume (in mL) of bleach = (moles of bleach / 0.05) * 1000\\Substituting the value of moles of bleach\\Volume (in mL) of bleach = (moles of cyclohexanol / 0.05) * 1000\\Substituting the value of moles of cyclohexanol\\Volume (in mL) of bleach = (10 g / 100.16 g/mol) / 0.05 * 1000\)

Simplifying:

\(Volume\ (in\ mL)\ of\ bleach = 199.64\ mL\)

Therefore, to oxidize 10 g of cyclohexanol, you would need approximately 200 mL of 5.0% w/v bleach (NaOCl).

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The compound with the lowest standard molar entropy at 25°C is KF(s). Molecular mass increases in the order KF < KCl < KBr < KI

The reason for this is that molar entropy generally increases with increasing molecular mass, due to the increased number of available energy levels and a greater dispersion of energy. In this case, the molecular mass increases in the order KF < KCl < KBr < KI, so KF would have the lowest standard molar entropy among these compounds. Entropy is directly equivalent to the disorderness or randomness of the system.

With the increase in temperature, the randomness of the system enhances as more amount of energy is imparted into the system, which results in the excitation of molecules.

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Molality is defined as the "moles solute/kg solvent." Therefore, the correct option is (b).

What is Molality?

Molality (m) is a measure of the concentration of a solute in a solution, and is defined as the number of moles of solute per kilogram of solvent.

The equation for molality is:

m = moles of solute / mass of solvent in kg

Concentration is the ability to focus one's attention and mental effort on a specific task or activity. It involves filtering out distractions and staying attentive to the task at hand. The level of concentration can vary depending on the person, the task, and the environment.

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Answer:

The lack of heat

Explanation:

when vapor gets cold enough, it reverts back to a liquid, when liquid gets cold enough, it freezes into a solid.

To make 250 mL of a 1.0 M solution from a 2.8 M HCl stock solution, you would measure approximately 89.3 mL of the stock solution and then dilute it to a total volume of 250 mL using an appropriate solvent (such as water).

To make a 250 mL of a 1.0 M solution from a 2.8 M HCl stock solution, you would need to calculate the volume of the stock solution required and dilute it to the desired concentration. The formula for dilution is:

C1V1 = C2V2

Where:

C1 = Concentration of stock solution

V1 = Volume of stock solution

C2 = Concentration of desired solution

V2 = Volume of desired solution

In this case, we want to find V1, the volume of the stock solution required.

Plugging the given values into the formula, we have:

(2.8 M)(V1) = (1.0 M)(250 mL)

Rearranging the formula to solve for V1:

V1 = (1.0 M)(250 mL) / 2.8 M

V1 ≈ 89.3 mL

Therefore, to make 250 mL of a 1.0 M solution from a 2.8 M HCl stock solution, you would measure approximately 89.3 mL of the stock solution and then dilute it to a total volume of 250 mL using an appropriate solvent (such as water).

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Answer:

7.67

Explanation:

According to molar concentration, the molarity of solution which contains 22.41 grams of NaCl in 50.0 ml of solution is 7.67 M.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.Substitution of values in the given formula gives, molarity= 22.41/58.44×1/0.05=7.67 M.

Thus, the  molarity of solution which contains 22.41 grams of NaCl in 50.0 ml of solution is 7.67 M.

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Answer:

3

Explanation:

the half life of a radioactive isotope is the amount of time one half of the isotope takes to decay

after 5 minutes the mass will be 24

after 10 minutes the mass will be 12

after 15 minutes the mass will be 6

after 20 minutes the mass will be 3

Option C) RbOH, HBr cannot be mixed together to form a buffer solution is Correct. A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added to it.

The ability of a solution to resist changes in pH is determined by the concentrations of the weak acids and bases present in the solution, as well as the concentration of the strong acid or base that is added to the solution. The weak acids and bases present in a buffer solution react with the strong acid or base to form a salt and water. The salt and water react to neutralize the strong acid or base, maintaining the pH of the solution.

In the case of RbOH and HBr, the weak base, RbOH, and the weak acid, HBr, cannot react with each other to form a salt and water. Therefore, they cannot form a buffer solution. The other pairs of solutions can form a buffer solution if the concentrations of the weak acids and bases present in the solutions are appropriate and the strong acid or base is added in the appropriate concentration.

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Explanation:

i found this I hope it helps

Answer:

the substance mixture can be sperate by filtration, distillation, and freezing.

Answer

Explanation

In the Lewis Dot structure, S = N - A is used to calculate the total number of shared and unshared electrons in a molecule.

S represents the TOTAL number of valence shared electrons in a molecule to achieve an octet, N represents the sum of the number of valence electrons of all the atoms of the molecule, and A is the number of valence electrons in an electron pot.

For SiCl₄, the valence electron on each atom coming together to form the molecule is:

Valence electron on Si = 4

Valence Electron on Cl = 7

Total valence electron on SiCl₄ = 4 + (4 x 7) = 32

The least electronegative Si atom is placed at the center, and four Cl atoms are connected with a single bond.

A single bond takes up 2 valence electrons, so for four bonds, 8 valence electrons have been occupied, and we are left with 32 - 8 = 24 valence electrons.

Thus, in the Lewis Dot structure S = N - A , the TOTAL number of valence electrons in a molecule to achieve an octet of SiCl₄ to achieve an octet is

Answer:

An example is the kinetic theory of matter.

According to this theory, all matter consists of tiny particles that are in constant motion.

Particles move at different speeds in matter in different states.