molecular views of the reactant solutions for a precipitation reaction are shown below (with ions represented as spheres and water molecules omitted): 1. which compound is dissolved in beaker a: [ select ] 2. which compound is dissolved in beaker b: [ select ] 3. name the precipitate when solutions a and b are mixed. [ select ] 4. what is the sum of the coefficients of the net ionic equation (enter a whole number such as 0, 1, 2, 3 etc.) [ select ]

Answer:

A. equation

B. atoms

C. products

Explanation:

Answer:

A

A chemical equation shows both the reactants and the products of a chemical equation

Most acid waves used in salons have a pH value between 4.5 and 7.0.

To explain further, pH is a scale used to measure the acidity or alkalinity of a substance. The scale ranges from 0 to 14, with 7 being neutral, values below 7 indicating acidity, and values above 7 indicating alkalinity. Acid waves, also known as acid perms, are used in salons to create permanent curls or waves in hair.

Acid waves typically have a pH value between 4.5 and 7.0, which is mildly acidic to neutral. This range is considered less damaging to the hair compared to alkaline perms, which have a higher pH value (around 9-10) and can cause more hair damage due to the higher concentration of alkaline substances. Acid waves work by breaking the disulfide bonds in hair proteins, allowing the hair to be reshaped into curls or waves. After the desired shape is achieved, a neutralizing agent is applied to reform the disulfide bonds, locking in the new hair structure.

In summary, most acid waves used in salons have a pH value between 4.5 and 7.0, which contributes to their reputation as a gentler alternative to alkaline perms. This pH range allows the acid waves to effectively reshape hair while minimizing potential damage.

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Answer:

3H2 + N2 ---> 2NH3

Explanation:

The heat that is transferred in the reaction can be given as -42.7kJ/mol

We know that the reaction equation can be written as;

HCl + NaOH ---->NaCl +H2O

Then Number of moles of HCl = 75/1000 * 1.25 = 0.09375 moles

Then we know that the total mass of the solutions is;

(75g + 75 g) = 150 g

We would then have the heat that is absorbed by the solution in the calorimeter as;

H = mcdT

H = 150 * 4.18 * (28.32 - 21.45)

H = 4.3 kJ

The heat of the reaction is thus;

ΔH rxn = -(4.3 kJ)/0.09375 moles

= -42.7kJ/mol

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Answer:Color, Density, Volume, Mass, and Boiling point. These are 5 3 more to go!

Explanation:

Color (intensive), Density (intensive), Volume (extensive), Mass (extensive) , Boiling point (intensive), Melting point (intensive) are the 7 main properties of matter .

What are  properties of matter?

Any attribute that can be measured, including an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more, is referred to as a property of matter.

Short answer: What is the matter?

The term "matter" refers to a substance that is composed of several kinds of particles, occupies space, and has inertia. The different kinds of particles each have a unique mass and size, according to the fundamentals of current physics.

                           The electron, proton, and neutron are three of the most prevalent instances of material particles.

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Answer:

Liquid to solid liquid to gas

Explanation:

Boiling a liquid result in a gas

Answer:

a chemical element

Explanation:

A chemical element is a substance that contains only one type of atom

Answer:

I believe the best answer is A.

Explanation:

A volatile liquid is a liquid that vaporizes under normal conditions (1 atm, 25°C). So if that is the case, then that means it would have an extremely low boiling point and it would slowly vaporize as it continued to sit there.

Answer:

A liquid that releases molecules as a vapor

Explanation:

Answer:

A

Explanation:

The formula for mechanical energy is mechanical energy = kinetic energy + potential energy.

Increasing LED brightness with a lampshade or reflection and choosing LED lights with high luminous efficiency can be useful  to obtain a brighter lamp.

Lamp, lighting device, initially a jar housing a flame soaked in flammable substance, and later such light-producing devices as gas and electrical lamps.

The light was developed at least 70,000 years ago. Originally, it was a sunken rock filled in moss or other absorbent substance, saturated in animal fat, and burned. The ways to obtain a brighter lamp are

Increasing LED brightness with a lampshade or reflection.

To boost brightness, use greater color temperature LED lights.

Choosing LED lights with high luminous efficiency.

With increased voltage, LED lights get brighter.

Therefore, in above ways we can get brighter lamp.

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Answer: Its D

Photons are particles of light and have a wavelength.

Explanation:

i did the quiz

Photons are the particles of light which have a particular wavelength and frequency. Photons are the units of light which contain energy. Thus, the correct option is D.

A photon is a tiny particle which comprises of the waves of electromagnetic radiation. As explained by Maxwell, photons are just electric fields which travels through the space. Photons have no net charge, no resting mass, and can travel at the speed of light.

Photons are the packets of light energy (quantum). These are required for the process of photosynthesis in plants. Plants capture the light energy and convert it into chemical energy which is useable by living organisms.

Therefore, the correct option is D.

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Answer:

g) 400 (h) 1331 (i) 11 (j) 20 (k) 13 (l) 15 ... (e) 1 , 2, 3, 6, 9, 18 (f) 1, 5, 25 (g) 1, 2, 4, 5, 8, 10, 20, 40. (h) 1, 2 ... 19. 70 x. (h) x. 6. (i). 9. 8 x. (j). 27. 24 x. (k). 5. 4. 20 a b. +. (l). 8. 3. 24 x y. +. (m).

Answer:

b

Explanation:

temporary bc it's have time so the water can cycle

0.050 moles of hydrogen gas are liberated when a given quantity of charge liberates 0.050 moles of lead.

The amount in moles of hydrogen produced when the same quantity of electricity is passed through different electrolytes is inversely proportional to the charge on the ions.

The charge on the Lead ion is +2.

The charge on the hydrogen ion is +1.

2 atoms of hydrogen gives one molecule of hydrogen gas.

Hence, equal charge liberates equal amounts in moles of lead and hydrogen gas.

Therefore, 0.050 moles of hydrogen gas are liberated when a given quantity of charge liberates 0.050 moles of lead.

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Answer:

Mass = 206.38 g

Explanation:

Given data:

Mass of calcium chloride = 80.0 g

Mass of silver chloride formed = ?

Solution:

Chemical equation:

CaCl₂ + 2AgNO₃     →    Ca(NO₃)₂ + 2AgCl

Number of moles of CaCl₂:

Number of moles = mass/molar mass

Number of moles = 80.0 g/ 110.98 g/mol

Number of moles = 0.72 mol

Now we will compare the moles of CaCl₂ and AgCl

          CaCl₂          :         AgCl

             1               :             2

           0.72          :           2/1×0.72 = 1.44 mol

Mass of silver chloride:

Mass = number of moles × molar mass

Mass = 1.44 mol × 143.32 g/mol

Mass = 206.38 g

Carbon dioxide

Explanation:

because when hydrogen mixes with oxygen carbon dioxide is canceled out

The atom's valence electrons experience the greatest effective nuclear charge is the valence electrons in Te. the correct option is 3.

Valence electrons are the electrons that are present in the outer shell of the atoms. These electrons are free electrons to form bonds with the electrons of other atoms.

The element that has fewer valence electrons can easily donate its electron and make the bond with another atom. Its reactivity will be high. If an atom contains many-electron in its outer shell, it will be difficult to donate them.

But if the atom will need just one or two electrons to complete its shell, then its reactivity will be high. Here, the Te will have the greatest effective nuclear charge.

Thus, the correct option is 3. The valence electrons in Te.

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To determine the amount of water and methane needed, we can set up a system of equations based on the desired composition of the mixture. you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

Let's assume x represents the number of gallons of water and y represents the number of gallons of methane. We have the following information: The total volume of the mixture is 90 gallons: x + y = 90. The mixture should be 60% methane: (y / (x + y)) * 100 = 60. Simplifying the second equation: y / (x + y) = 0.6. Now we can solve the system of equations: From equation 1, we can express x in terms of y: x = 90 - y. Substituting this into equation 2: y / ((90 - y) + y) = 0.6. Simplifying further: y / 90 = 0.6. Solving for y: y = 0.6 * 90. y = 54. Now we can find x using equation 1: x = 90 - y. x = 90 - 54. x = 36. Therefore, you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

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Answer:

The correct option is;

Group 12

Explanation:

A metallic element that is shiny and silver colored that can exist in the +1 and +2 ionic states and  which forms a bright red compound with sulfur is mercury, Hg

The compound formed between mercury and silver is one of the earliest synthetic compound also known as vermilion and cinnabar. The bright red pigment of the HgS is used widely and is one of the most favorite pigment found in medieval European outstanding works of arts and in Chinese decorated wares made of lacquer as well as in mesoAmerica.

Answer:

12

Explanation:

Answer:

Hydrogen and Oxygen

Explanation:

The chemical equation for water is H20, meaning Hydrogen and 2 oxygen!

Temperature of the material needs to be measured. Then the equation Q=mcΔT needs to be used, where Q is the heat energy, m is the mass, c is the specific heat capacity and ΔT is the change intemperature.

Material is something that can be seen, felt, and/or interacted with. It is the physical substance of which a thing is composed. Materials can be made up of elements, compounds, and/or mixtures of these. Examples of materials include metals, plastics, rubber, wood, paper, cloth, glass, and water. Each material has unique properties such as strength, weight, color, texture, and durability. The choice of material used in a design or product is important as it affects the cost, performance, and overall success of the item.

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A temperature reversal is a layer in the air where air temperature increments with level. The lower part of a cap has an inversion. The cap is a layer of relatively warm air above. In the winter, a long, clear night is ideal for temperature inversion.

It ensures that the heat that escapes is greater than the heat that enters. Nevertheless, air should not be mixed vertically at lower levels. The earth is cooler than the air above it in the early morning hours because the day's heat is reflected off during the night. Temperature inversion is typical over polar regions.

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As a result, the formula for this reaction is "two moles of hydrogen react with one mole of oxygen to generate two moles on water." It takes 10 moles for oxygen gas to create 20 moles of water.

Oxygen and hydrogen react at a 2:1 molar ratio, as shown by the reaction equation. In this case, 8.0 mol of oxygen will be needed for every 16.0 mol of hydrogen. There is only 0.50 mol pf oxygen reactant at hand. Thus, the limiting reactant is oxygen.

We divide the amount of moles by the molar mass to get the mass of two moles of water: 36 g is equal to 2 mole X [2(1) + 16]g/mole. Its molar weight of water equals 18 g/mole because we may calculate a compound's molar mass by adding the masses of its constituent atoms.

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The partial pressure of oxygen gas (O₂) in the mixture is 0.50 atm.

Ideal Gas Law: PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is the temperature. Since the volume (V) and temperature (T) are constant, we can rearrange the equation to find n (moles) for each gas:

n = PV/RT

For your second question, we are given the total pressure (7.00 atm) and partial pressures of hydrogen gas (3.00 atm) and helium gas (3.50 atm). To find the partial pressure of oxygen gas, we can use the following equation:

Total pressure = P_H₂ + P_He + P_O₂

7.00 atm = 3.00 atm (H₂) + 3.50 atm (He) + P_O₂

Now we just need to solve for P_O₂:

7.00 atm - 3.00 atm - 3.50 atm = P_O₂
0.50 atm = P_O₂

So, the partial pressure of oxygen gas (O₂) in the mixture is 0.50 atm.

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\(HCLO_{2}\) is the strongest acid.

Based on the oxidation state of the central atom, the acidity is determined.

More acidic nature is present at higher oxidation states.

It is +3 in \(HCLO_{2}\)

It is +1 in HClO and +1 in HBrO

Chloric acid, hydrobromic acid, hydrochloric acid, hydroiodic acid, nitric acid, perchloric acid, and sulfuric acid are the seven major acids that make up strong acids.

These are referred to as strong acids since they can totally dissociate in water.

An acid that entirely ionizes in an aqueous solution is referred to as a strong acid.

When an acid is dissolved in water, it always loses a proton (A H+). In other words, a strong acid is highly effective in releasing protons and constantly on the move. An acid that partially ionizes in a solution is considered weak.

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Green chemistry is a specific approach within the field of environmental chemistry that emphasizes the design of environmentally friendly chemical processes, while environmental chemistry is a broader discipline that encompasses the study of chemicals in the environment and their impact on ecosystems and human health.

The terms "green chemistry" and "environmental chemistry" are related but have distinct meanings and scopes. While there is some overlap between the two, they are not synonyms.

Green chemistry primarily focuses on designing and developing chemical processes and products that are environmentally friendly, sustainable, and minimize the generation and release of hazardous substances. It aims to reduce the negative impact of chemical processes on human health and the environment throughout their lifecycle, including their production, use, and disposal.

On the other hand, environmental chemistry is a broader discipline that encompasses the study of chemical processes and interactions in the environment. It involves understanding the sources, fate, transport, and transformation of chemicals in various environmental compartments such as air, water, soil, and living organisms. Environmental chemists investigate the behavior and effects of pollutants and contaminants on ecosystems, human health, and the environment as a whole.

While green chemistry addresses industrial processes and the development of sustainable chemicals and technologies, environmental chemistry encompasses a wider range of topics, including atmospheric chemistry, aquatic chemistry, soil chemistry, and the analysis of environmental samples. Environmental chemistry examines the impact of various pollutants, both natural and human-made, on the environment and seeks to understand their behavior and potential risks.

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The final temperature : 79.07°C

Heat transferred can be formulated

Q=m.c.ΔT

Q= heat, J

m=mass,g

c=specific heat, for water 4.18 J/g C

ΔT = temperature

Heat transferred : 130 kcal

1 kcal = 4186 J

130 kcal =  

\(\tt 130\times 4186=544180~J\)

mass = 2.5 kg =2500 g

t₁=27 °c

The final temperature :

\(\tt 544180=2500\times 4.18\times (t_2-27)\\\\t_2-27=52.07\\\\t_2=79.07^oC\)

Acetylsalicylic acid is a weak acid and can partially dissociate in water, releasing hydrogen ions and decreasing the pH of the solution.

The pH of the solution obtained by dissolving two extra-strength aspirin tablets, containing 420 mg of acetylsalicylic acid each, in 370 ml of water is dependent on various factors such as the purity of the aspirin, temperature, and other substances present in the water. However, generally speaking, the pH of such a solution is likely to be slightly acidic, with a range of around 4-6. This is because acetylsalicylic acid is a weak acid and can partially dissociate in water, releasing hydrogen ions and decreasing the pH of the solution.

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