What is the purpose of the arrow in a chemical equation?
O A.
It indicates the direction in which the reaction occurs.
Св.
It separates the elements from the compounds.
O C.
It indicates the direction of increase in the number of molecules.
D.
It indicates the direction of heat movement in a reaction.
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Answer:

Kinetic energy might transferred from one particle to another during an elastic collision, but  i don't think that there is going to be any change in the total energy of the colliding particles. Because there are no forces of attraction or repulsion between gas particles .

Explanation:

Sodium carbonate, also known as washing soda or soda ash, has a wide range of applications. Sodium carbonate can be naturally occurring or synthetically produced through various methods, including the Solvay process, which is the most common method of industrial production.

Sodium carbonate, also known as washing soda or soda ash, has many uses, including:

1) Cleaning agent: Sodium carbonate is an effective cleaning agent due to its alkaline nature. It is used in laundry detergents and household cleaners to remove stains and grease from clothes and surfaces.

2) Industrial applications: Sodium carbonate is used in a variety of industrial applications. It is used in the production of glass, pulp and paper, and soaps and detergents. It is also used as a water softener and pH regulator in chemical processes.

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Answer:

2341, last option is the correct choice.

Explanation:

Boiling points of the given compounds are given as:

\(CH_4=-161.5\:C^{\circ}\\\\C_4H_{10}=-1\:C^{\circ}\\\\CH_2Cl_2=39.6\:C^{\circ}\\\\H_2O=100\:C^{\circ}\)

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Answer:

To obtain one mole of copper atoms (6.02 x 1023 atoms), ... mol Ag? (b) How many atoms of Ag are in 0.0342 mol Ag? 7 ... contain one S atom and two O atoms; calculate its molar mass.

11460 years ago a sample of wood was the part of a living tree.

The time required for half of something to undergo a process.

Carbon-14 has a half-life of 5,730 years. That means that no matter how many carbon-14 atoms were present when something died, after 5,730 years only half of them are left the rest have decayed to nitrogen.

The half life of C-14 is \(t_{\frac{1}{2}}\) =5730 years.

This means that if you start with a sample of 100g, only 50g will be left in 5730 years.

Here, Only 25g is left, therefore the number of years is =5730 × 2  = 11460years.

Hence, 11460 years ago a sample of wood was the part of a living tree.

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Answer:

clean air

Explanation:

Answer:

Dmitri Mendeleev=Russian chemist, Albert Ghiorso=American scientist

Explanation:

A waffle that produces 207.14 kilocalories when burned in a calorimeter.

1 calorie = 4.2 J

1 J = 1/4.2 calorie

870 kJ = 207.14 kilocalories

Hence,  a waffle that produces 207.14 kilocalories when burned in a calorimeter.

A calorimeter is an object used for calorimetry, or the method of measuring the warmth of chemical reactions or bodily modifications in addition to warmness potential. Differential scanning calorimeters, isothermal micro calorimeters, titration calorimeters and elevated charge calorimeters are a few of the maximum common sorts.

Calorimeter, device for measuring the heat developed at some point of a mechanical, electrical, or chemical reaction and for calculating the warmth capability of materials.

An ordinary calorimeter works by actually taking pictures all of the electricity released or absorbed by a response in a water bath. The strength that enters the water have to be precisely identical to the electricity launched through the chemical response.

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Layer 1 because it is closest to the surface

Answer:a substance made by mixing other substances together.

Explanation:trust me

Answer:

B. 126

Explanation:

the scale is 1 to 42 so the scale would be:

3 cm:x cm

3 * 42 = 126 cm

Answer:

What event prompted the persian Gulf War?

Answer:

Using N = n × L

L = Avogadro's constant =6.02 ×10^23

n = number of moles

N = Number of entities

N = 1.5 × 10^24

n = N /L

n = 1.5×10^24/6.02×10^23

n = 2.49 moles

Hope this helps.

"Option C" O¹⁵8 and O¹⁶8 atoms represent different isotopes of the same element.

Hope it helps...

Mass of Nitrogen= 42 grams

Given

one mole of Sodium azide

Required

mass of Nitrogen

Solution

Reaction

The decomposition of one mol of sodium azide :

2 N a N 3 ( s ) → 2Na ( s ) + 3 N2 ( g )

From the equation, the mol ratio of N a N 3 ( s ) :  N2 ( g ) = 2 : 3, so mol N2 :

= 3/2 x mol N a N 3

= 3/2 x 1

= 1.5 moles

Mass of Nitrogen

= mol x molar mass

= 1.5 x 28 g/mol

= 42 grams

Answer:

A liquid of unknown composition: Unknown liquid

A liquid of known composition: Known liquid

A solid-liquid mixture of unknown composition: Unknown solid-liquid mixture

A solid of known composition: Known solid

If there is sufficient fossil fuel, we will cope by utilizing it in a responsible and sustainable manner while actively transitioning towards alternative energy sources. Coping with the abundance of fossil fuels requires a multi-faceted approach that considers environmental, economic, and social aspects.

To cope effectively, we can:

1. Promote energy efficiency: Invest in technologies and practices that minimize energy waste and maximize efficiency in all sectors, including transportation, industries, and buildings.

2. Transition to renewable energy: Increase the adoption of renewable energy sources such as solar, wind, hydro, and geothermal power. This reduces our reliance on fossil fuels and mitigates environmental impacts.

3. Implement policy measures: Enact policies that incentivize the use of renewable energy, discourage excessive fossil fuel consumption, and promote sustainable practices.

4. Invest in research and development: Support and fund research efforts aimed at developing cleaner and more sustainable energy technologies, such as advanced battery storage, hydrogen fuel cells, and carbon capture and storage.

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A voltaic cell consists of a copper electrode in a solution of copper(II) ions and a palladium electrode in a solution of palladium(II) ions. The palladium is the cathode and its reduction potential is 0.951 V.

a)  Cu(s) → \(Cu^{2+}\)(aq) + 2\(e^-\)

b)   E°ox = -0.340 V

c)    Keq = 3.98 × 10²⁰

Voltaic and galvanic cells are the exact same thing; they only go by various names. The Luigi Galvani-inspired Galvanic cell is made up of two distinct metals joined together via a salt bridge and a porous disc in between each of the separate half-cells. It is sometimes referred to as an electrochemical or voltaic cell. Galvanic (as well as voltaic) cells produce an electric current through a redox process that is thermodynamically favoured. Each half-reaction occurs in its own compartment, or half-cell, which also contains an electrode.

a)     Cu(s) → \(Cu^{2+}\)(aq) + 2\(e^-\)

b)     E°cell = E°red + E°ox

   0.609 V = 0.951 V + E°ox

   E°ox = -0.340 V

c)  log Keq = n × E°/0.0592

   log Keq = 2 × 0.609 V/0.0592 = 20.6

   Keq = 1020.6 = 3.98 × 10²⁰

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Answer:

swim alot ig and do what they said up there

Based on the given bright-line spectra and the observed wavelengths in the mixture's spectrum, the elements G and J are the ones present in the mixture.

From the given bright-line spectra and the spectrum of the mixture, we can determine the elements present in the mixture by comparing the specific wavelengths observed. Examining the bright-line spectra, we can identify that G has a distinct wavelength at 650 nm, J at 600 nm, L at 550 nm, and M at 500 nm.

Looking at the spectrum of the mixture, we can observe two prominent wavelengths, 650 nm and 600 nm. These correspond to the wavelengths of G and J, respectively. Since the spectrum of the mixture does not exhibit the wavelengths specific to L (550 nm) or M (500 nm), we can conclude that only G and J are present in the mixture.

Therefore, based on the given bright-line spectra and the observed wavelengths in the mixture's spectrum, the elements G and J are the ones present in the mixture.

This analysis relies on the principle that each element has characteristic wavelengths at which they emit light. By comparing the observed wavelengths in the mixture's spectrum with those of the individual elements, we can determine the elements present in the mixture.

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Answer:

56.41 g

Explanation:

Moles = Mass ÷ \(A_{r}\)

Given that,

moles = 0.523 mol

\(A_{r}\) = 107.8682 u

mass = ?

Mass = Moles × \(A_{r}\)

Mass = 0.523 × 107.8682

mass =  56.41 g

The de Broglie wavelength of the neutron moving at a velocity of 7.11×10⁶ m/s is 5.56×10¯¹⁴ m

λ = h /mv

Where

The following data were obtained from the question:

The de Broglie wavelength can be obtained as follow:

λ = h /mv

λ = 6.626×10¯³⁴ / (1.676×10⁻²⁷ × 7.11×10⁶)

λ = 5.56×10¯¹⁴ m

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Answer:

The volume of the liquid is 35.5mL.

Explanation:

The correct way to read the volume is at the bottom of the meniscus, as we can see in the following drawing:

So, the volume of the liquid is 35.5mL.

Answer:

Eukarya

Explanation:

It's larger than a prokaryotic cell and it has a nucleus.

De Broglie contributed to the development of the modern model of atoms by describing the wave properties of particles. Option E.

Louis de Broglie was a French physicist who made significant contributions to the development of quantum mechanics.

In his doctoral thesis, he proposed that particles, such as electrons, have both particle-like and wave-like properties. This idea became known as wave-particle duality and laid the foundation for the development of the modern model of the atom.

According to de Broglie's theory, particles can exhibit wave-like behavior and have a wavelength that is inversely proportional to their momentum.

This theory was later experimentally confirmed in a series of experiments that demonstrated the diffraction of electrons and other particles.

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Answer:

The cat

Explanation:

1) You need to find how many meters per second each thing is sprinting, so you can divide the meters by seconds for each.

\(\frac{240}{30} = 8 m/s\\\frac{100}{9.5} = around 10.5 m/s\)

2) Per second, the sprinter is able to achieve 8 meters, while the cat can do around 10.5 meters. 10.5 is greater than 8, making the cat faster than the sprinter.

Answer with Explanation:

To determine the amount of water needed to dilute a 2.5 M KCl solution to a 1.0 M solution, we can use the dilution formula:

M1V1 = M2V2

where M1 is the initial concentration, V1 is the initial volume, M2 is the final concentration, and V2 is the final volume.

In this case, we know that:

M1 = 2.5 M

V1 = 550 mL

M2 = 1.0 M

We want to find V2, the final volume of the solution, which will be greater than 550 mL due to the addition of water.

Using the dilution formula, we can solve for V2:

M1V1 = M2V2

2.5 M x 550 mL = 1.0 M x V2

V2 = (2.5 M x 550 mL) / 1.0 M

V2 = 1375 mL

Therefore, we would need to add 1375 mL - 550 mL = 825 mL of water to 550 mL of a 2.5 M KCl solution to make a 1.0 M solution.

Answer:

pickles are ligit good

Explanation:

i like pickles but not his