Round to 4 significant figures. 9.87553​

Answer:

What are the characteristics of a revolver?

Explanation:

The revolver features several firing chambers located within a revolving cylinder. The cylinder rotates as the revolver is fired, lining up each bullet mechanically.

Answer:

Oxygen is negative charge

Explanation:

And The 2 Hydrogens are positive charges

Answer:

10

Explanation:

Answer:

12

Explanation:

4x3=12

Detergent, ethanol, and salt can all play important roles in extraction processes, depending on the specific type of biomolecule being extracted and the purification needs.

Detergent, ethanol, and salt can all play important roles in different types of extraction processes. Here's an overview of how each of them can be used:

Detergent: Detergents are often used to extract proteins or other biomolecules from biological samples. Detergents are able to solubilize membrane-bound proteins by disrupting the lipid bilayer of the cell membrane. This allows the proteins to be extracted into a solution. Detergents can also help to break apart protein complexes, making it easier to isolate individual proteins.

Ethanol: Ethanol is commonly used as a solvent in extractions because it can dissolve a wide range of organic compounds, including lipids and proteins. Ethanol can also be used to precipitate DNA or RNA from a solution. When added to a solution of DNA or RNA, ethanol causes the nucleic acids to clump together and form a visible precipitate, which can then be collected and further purified.

Salt: Salt is often used in DNA and RNA extractions to help remove proteins and other impurities from the sample. When salt is added to a solution, it can cause proteins to denature and precipitate out of the solution. The salt can then be removed along with the precipitated proteins. In addition, salt can help to bind DNA or RNA to a solid support, such as a column or a membrane, making it easier to isolate the nucleic acid from other components of the sample.

In summary, detergent, ethanol, and salt can all play important roles in extraction processes, depending on the specific type of biomolecule being extracted and the purification needs. Detergents are useful for solubilizing proteins, ethanol can dissolve a wide range of organic compounds, and salt can help to remove impurities and bind DNA or RNA to a solid support.

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The abundance of an element in nature, its percent composition in compounds, and its average atomic mass are all interconnected and can be used to draw conclusions about the properties and behavior of elements and compounds.

There are several conclusions that can be drawn between abundance in nature, percent composition, and average atomic mass. First, the abundance of an element in nature is directly related to its percent composition. Elements that are more abundant in nature will have a higher percent composition in a compound. For example, oxygen is the most abundant element in the Earth's crust, making up 46.6% of its mass. Therefore, compounds that are found in the Earth's crust, such as silicates, will have a high percent composition of oxygen.

Secondly, the average atomic mass of an element is also related to its abundance in nature. The average atomic mass of an element is the weighted average of the masses of its isotopes, which takes into account the abundance of each isotope. For example, the element chlorine has two stable isotopes, Cl-35 and Cl-37. The average atomic mass of chlorine is 35.45, which reflects the fact that Cl-35 is more abundant in nature than Cl-37.

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Fire is a risk in all commercial kitchens. Open flames, grease, poor house-keeping practices, electrical hazards and flammable materials are common causes of restaurant fires.

What is an accidental fire?

Accidental fires are those in which the proven cause does not involve any deliberate human act to ignite or spread the fire.

Open flames, grease, poor house-keeping practices, electrical hazards and flammable materials are common causes of restaurant fires. Employers must implement effective administrative controls to protect employees and the business from the dangers of fire.

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Answer:

For cations:

• The trend of cation formation increases.

For anions:

• The trend of anion formation decreases

Explanation:

Across the periodic table from group I to group VII, Atomic radius increases due to increase in energy levels. While nuclear charge is almost constant due to constant number of protons since electrons are added on the same shell.

Therefore, the effective nuclear charge will decrease since net nuclear attraction also decreases.

These are some of the important functions of the cytokinesis hormone in plants :-

Cytokinesis is a group of growth regulators that is found in plants. It helps in performing cell divison of plant roots, and shoot system. It also helps in promoting the cell's growth, development, flowering, and seed formation.

It helps in the protein production which is important for mitosis. It provides resistance against certain diseases causing bacteria in crops. It mainly contains Nitrogen, Hydrogen, and a few atoms of oxygen in its structure.

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The options for the function of cytokinesis should be:

(A) performing cell division in plant roots

(B) shoot system

(C) promoting the cell’s growth, development

(D) All of these

Answer - (D) All of these

Answer:

Thats potassium (k)

Explanation:

London dispersion forces are a type of Van der Waals force that is a feeble intermolecular contact caused by the creation of instantaneous dipoles in molecules.

The coulombic reactions between instantaneous dipoles lead to London dispersion pressures. All molecules (and atoms) exhibit dispersion forces, which are usually higher for heavier, more polarizable, and molecules with bigger surface areas.
In honour of Fritz London (1900–1954), a German scientist who created this model to describe the intermolecular attractions that occur between non–polar molecules, the instantaneous dipole–induced dipole attractions are known as London dispersion forces. All compounds experience the London dispersion forces.
Net dipole moments are negative for non-polar substances. When their charge cloud is twisted, they produce a transient dipole moment, which in turn induces a transient dipole moment on a different non-polar particle.
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Answer: Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction.

Explanation:

The amount of work that has been done would be 72 Joules.

The work done by a body can be defined as the amount of energy transferred from one body to another body.  In other words, work is the product of force and the distance moved by the force.

This can be expressed mathematically as:

Work = force x distance moved by the force.

In this case:

Force = 12 newton

Distance = 6 meters

Work done = 12 x 6

                   = 72 NM or 72 Joules

In other words, if I move a 12 Newton box by 6 meters across the floor, the amount of work done would be 72 Joules.

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The final temperature : 345 K

Given

475 cm³ initial volume

600 cm³ final volume

Required

The final temperature

Solution

At standard temperature and pressure , T = 273 K and 1 atm

Charles's Law  :

When the gas pressure is kept constant, the gas volume is proportional to the temperature  

V₁/T₁=V₂/T₂

Input the value :

T₂=(V₂T₁)/V₁

T₂=(600 x 273)/475

T₂=345 K

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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Answer:

D

Explanation:

Salinity is the saltiness or amount of salt dissolved in a body of water

Answer:

its b trust me i got it right

Explanation:

Answer:

gAIN

Explanation:

Answer:

convection

Explanation:

Answer: Convection is correct because of the currents that are placed when the heat comes up and the cooler liquid is going to the bottom!!!

Answer:

Increasing the temperature a reaction takes place at increases the rate of reaction. At higher temperatures, particles can collide more often and with more energy, which makes the reaction take place more quickly.

Explanation:

The percent ionization of a 0.14 M benzoic acid solution in pure water is approximately 2.6%.

Benzoic acid is a weak acid, and when it is dissolved in water, it undergoes a reversible dissociation reaction:

The equilibrium constant for this reaction is known as the acid dissociation constant, Kₐ. The value of Kₐ for benzoic acid is given as 6.5 x 10⁻⁵.

To calculate the percent ionization, we need to determine the concentration of the ionized form of the acid (C₇H₅O₂⁻) at equilibrium.

At equilibrium, the initial concentration of benzoic acid (HC₇H₅O₂) will decrease by an amount x, and the concentration of the ionized form (C₇H₅O₂⁻) will increase by the same amount.

Using the equilibrium expression for Ka, we can write:

Assuming that x is small compared to the initial concentration of benzoic acid, we can make the approximation that [HC₇H₅O₂] ≈ 0.14 M - x, and [C₇H₅O₂⁻] ≈ x. We can also assume that [H₃O⁺] ≈ x, since benzoic acid is a weak acid and the concentration of H₃O⁺ will be very small compared to the initial concentration of benzoic acid.

Substituting these approximations into the equilibrium expression, we get:

Solving for x using the quadratic formula, we get:

The percent ionization is then:

Therefore, the percent ionization of a 0.14 M benzoic acid solution in pure water is approximately 2.6%.

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Another word which can be used to replace gas is air.

Air is a gas simply because it is a mixture of a number of gases. In order words, air consists of different gases including hydrogen gas, oxygen gas, carbon dioxide gas, rare or noble gases, dust, moisture, nitrogen gas and so on and so forth. Because air is an embodiment of different gases, it is on this premise that the word " air " can be used instead of gas.

However, there are so many other words which can be used as synonyms for gas or to replace gas; among which include: fart, vapor or even steam.

So therefore, we can now confirm from the detailed explanation above that when we talk about gas, we are referring to air as well.

Complete question:

What is another word for gas?

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The change in entropy Δs when 3.4 g of diethyl ether condenses at 34.6 °C is 4.1 J/K.

Enthаlpy (H) is defined аs the аmount of energy releаsed or аbsorbed during а chemicаl reаction. Entropy (S) defines the degree of rаndomness or disorder in а system.

The relаtionship between both pаrаmeters is given аs;

ΔS = ΔH ÷ T

ΔH = 26.7 KJ/mol for 1 mol of diethyl ether

number of moles = mаss ÷ molаr mаss

number of moles = 3.4 ÷ 72 = 0.04722

ΔH = 26700 × 0.04722 = 1260.77 J

T = 34.6 + 273 = 307.6 (upon converting to Kelvin temperаture)

ΔS = 1260.77 ÷ 307.6

ΔS = 4.1 J/K

Your question is incomplete, but most probably your full question can be seen in the Attachment.

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Answer:

Explanation:

Answer:

Choice B, as time goes on the surface level rises and stuff buried underground gets further and further below surface level.

Answer:

Percent yield = 87.77%

Explanation:

Given:

Actual yield = 40.2 grams

Theoretical yield = 45.8 grams

Find:

Percent yield

Computation:

Percent yield = [Actual yield / Theoretical yield] 100

Percent yield = [40.2 / 45.8] 100

Percent yield = 87.77%

At constant temperatures, the simplest approach to reduce the volume of a gas is to raise its pressure. So, at 700 bar, or 700 times normal atmospheric pressure, hydrogen has a density of 42 kg/m3, compared to 0.090 kg/m3 at normal pressure and temperature.

Hydrogen decreases metal oxides in the reactivity series below. That is, hydrogen can only decrease the oxides of metals that are less reactive than hydrogen itself.

High-Temperature Water Splitting: Chemical processes that split water to make hydrogen are fueled by high temperatures generated by solar concentrators or nuclear reactors.

The oxidation number of hydrogen gas is 0, but the oxidation state of hydrogen atoms in water is +1. As a result, the hydrogen atom has been oxidized. It acts as a reducing agent.

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Answer:

Oil- Only London Dispersion Forces (the weakest intermolecular force)

Water- London Dispersion, Dipole-Dipole, and Hydrogen Bonding

Answer:

N₂

Explanation:

Sodium is a larger molecule with a much higher molecular weight. However, 20g of N₂ would be a smaller amount of molecules than 20g of sodium due to how there are multiple nitrogen molecules.

2/3 * given mass of N₂ = mass of N₃

N₃ (Azide ion) given mass = 20g

Na = 20g

Masses of chemicals are equal

Na = 22.990g/mol

20g/22.990g/mol = 0.8699mol of Na

N₃ = 20g

N₃ = N g/mol x 3

N = 14.007 g/mol

14.007 x 3 = 42.021 g/mol

N₃ = 42.021g/mol

20g/42.021g/mol = 0.4759 mol of N₃

Notice how there are fewer moles of the Azide ion than the Sodium.

0.4759 moles of NaN₃ is produced

combine molecular weights:

42.021 + 22.990 = 65.011 g/mol

multiply by amount of moles of the limiting reactant:

0.4759 mol *65.011 = 30.942 g

Also, here is the balanced equation:

3N₂ + 2Na = 2NaN₃

The results are the same as the balanced equation.