how to check if the rain is acidic

Answer:

6.098M

Explanation:

akording to m1v1/m2v2=n1/n2

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

C. Atoms are arranged during chemical reactions

Explanation:

All matter is made of atoms and atoms are indivisible and indestructible. compounds are formed by a combination of two or more different kinds of atoms.

Answer:

\(V_2= 38.9mL\)

Explanation:

Hello there!

In this case, since this is a problem about the combined gas law because the temperature, volume and pressure undergo a change:

\(\frac{P_2V_2}{T_2}= \frac{P_1V_1}{T_1}\)

Thus, since we need the final volume, V2, we solve for it as shown below:

\(V_2= \frac{P_1V_1T_2}{T_1P_2}\)

Now, we plug in the data to obtain:

\(V_2= \frac{1.30atm*46.0mL*(2.09+273)K}{(5+273)K*1.52atm}\\\\V_2= 38.9mL\)

Best regards!

To determine the rate constant of a first-order reaction, we can use the equation for the half-life of a first-order reaction: t1/2 = ln(2) / k

Given:

Half-life (t1/2) = 36 min We need to convert the half-life from minutes to seconds to match the units of the rate constant. Therefore, t1/2 = 36 min * 60 s/min = 2160 s.

Now we can rearrange the equation and solve for the rate constant (k):

k = ln(2) / t1/2

Substituting the given value, we have:

k = ln(2) / 2160 s Calculating this expression, we find that the rate constant is approximately 3.214 x 10^(-4) s^(-1). Therefore, the correct answer is option A. 3.2 x 10^(-4) s^(-1).

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Answer:

0.412 moles

Explanation:

No of moles =given mass /molar mass

30.56/74=0.412 moles

Note these are the number of moles of

Ca(OH)2 not Ca(OH)

The difference in volume is -59.1 mL, indicating that the actual volume of the solution is slightly less than the initial volume of the water and ethanol that were mixed.

These are the following steps for calculation :-

First, we need to calculate the amount of ethanol in the solution:

moles of ethanol = molarity × volume of solution

moles of ethanol = 10.32 mol/L × 0.6940 L

moles of ethanol = 7.15488 mol

Next, we can calculate the mass of ethanol in the solution:

mass of ethanol = volume of ethanol × density of ethanol

mass of ethanol = 0.6940 L × 0.7893 g/mL

mass of ethanol = 0.547 grams

Now we can calculate the mass of water in the solution:

mass of water = volume of water × density of water

mass of water = 0.5060 L × 1 g/mL

mass of water = 0.5060 grams

The total mass of the solution is:

total mass = mass of ethanol + mass of water

total mass = 0.547 grams + 0.5060 grams

total mass = 1.053 grams

The density of the solution is:

density = total mass / total volume

total volume = total mass / density

total volume = 1.053 grams / (694.0 mL + 506.0 mL)

total volume = 1.053 grams / 1200 mL

total volume = 0.8775 g/mL

The difference in volume between the total volume of water and ethanol that were mixed to prepare the solution and the actual volume of the solution is:

difference in volume = actual volume - initial volume

difference in volume = 1 / 0.8775 - (694.0 mL + 506.0 mL)

difference in volume = 1.1409 L - 1200 mL

difference in volume = -59.1 mL

Therefore, the difference in volume is -59.1 mL, indicating that the actual volume of the solution is slightly less than the initial volume of the water and ethanol that were mixed.

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when the products of a reaction have a lower enthalpy than the reactants, the reaction is endothermic and the change in enthalpy is positive.

In Endothermic Reactions, heat is absorbed from the surroundings. This energy is required for the breakage of bonds so that the reaction can proceed. The overall temperature of the surroundings is decreased.

When heat is absorbed in a system the system has higher enthalpy at the end of the reaction. The change in enthalpy is positive when the reaction is endothermic.

Dissolution of ammonium chloride into water is an example of endothermic reactions.

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Answer: THE ANSWER BEFORE/AFTER MINE IS INCORRECT!!

The reaction is exothermic & The reactants lost internal energy.

I just got this one correct.

Hope I helped<3

It will be lower conductivity from a solute that does not dissolve well in solution.

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The heat of the reaction is 90.83 kJ/mol.

The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

It is a measure of how much energy it takes to raise the temperature of a substance. It is the amount of heat necessary to raise one mass unit of that substance by one temperature unit.

It is given by the formula -

                                                  Q = mcΔT

where, Q = amount of heat

m = mass

c = specific heat

ΔT = Change in temperature

Heat of formation is the opposite of heat of reaction.

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Answer:

121.1g

Explanation:

First, we need to convert the number of molecules of NaCl to moles (n) by dividing by Avagadro number

That is, n = number of molecules ÷ 6.02 × 10²³

n = 1.25 X 10²⁴ ÷ 6.02 × 10²³

n = 1.25/6.02 × 10^ (24-23)

n = 0.207 × 10¹

n = 2.07moles

Using the formula; mole = mass ÷ molar mass

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

mass = molar mass × mole

mass = 58.5 × 2.07

mass = 121.1g

The persistence of vision is regarded as an optical illusion but it is actually part of human physiology.

The term persistence of vision is the idea that an object is able to remain is sight for a long time even when the object has been removed. This is often used by performers to create a remarkable impression on the audience. The persistence of vision is regarded as an optical illusion but it is actually part of human physiology.

The way that a performance can be designed to make the audience to know that this is the most important scene is called follow through.

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1) Chemical formula

2) Mg Lewis structure

3) O2 Lewis structure

4) MgO Lewis structure

5) Chemical formula written as Lewis dot structure

.

Answer:

a flowing stream

Explanation:

.........

The labs in this chemistry class use a green approach, which means they prioritize environmentally friendly practices.

In this chemistry class, the term "green approach" refers to a set of practices and principles that prioritize environmental sustainability and minimize negative impacts on the ecosystem. These labs aim to reduce their carbon footprint, conserve resources, and promote responsible waste management. By adopting a green approach, the class strives to align its scientific pursuits with the goal of environmental stewardship.

One of the key aspects of the green approach in these chemistry labs is the conscious selection and utilization of environmentally friendly materials and chemicals. This includes opting for safer alternatives to hazardous substances whenever possible, such as using non-toxic solvents or reagents. Additionally, the labs may encourage the use of renewable resources and promote the recycling or repurposing of materials to reduce waste generation.

Another important component of the green approach is energy conservation. The labs may employ energy-efficient equipment and lighting systems, as well as implement strategies to minimize energy consumption during experiments. For instance, they may encourage students to turn off equipment when not in use and adopt efficient heating or cooling methods.

Furthermore, the labs may focus on water conservation by promoting responsible water usage and minimizing water wastage during experiments. This could involve using water-efficient techniques, such as microscale experiments that require smaller amounts of water, or implementing recycling systems to capture and reuse water when appropriate.

By embracing a green approach, these chemistry labs aim to instill environmental awareness and responsibility in students while demonstrating that scientific progress can coexist with sustainable practices. Through this approach, students gain valuable knowledge and skills that they can apply in their future scientific endeavors, contributing to a more sustainable and eco-friendly society.

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(a) Within a reversible reaction, forward and reverse chemical reactions progress at the same pace while concentrations of products and reactants remain constant with time.

(b) Le Chatelier's principle states that an increase in pressure advantages a side containing fewer moles of gas. For instance, in the formation of methanol from CO and H2, one molecule of gas is formed while two molecules come from the elements themselves.

(c) Sustaining a pressure above 5 MPa would be costly as high-tensile materials, equipment and additional energy are needed to compress the gases at those pressures.

(d) Rising temperature allows for an equilibrium towards the endothermic direction, where heat consumption occurs. Here, since the exothermic reaction itself releases heat; it will result in a shift towards the reactant side, causing a fall in the yield rate of methanol produced.

(e) If a catalyst does not exist, reaction rates would slow down considerably, requiring higher temperatures to prompt reasonable reaction progression. This is because catalysts lower activation energy, enabling the reaction to be done at lesser temperatures.

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In any chemical reaction, the mass of the products must equal the mass of the reactants. The mass of product B is the same as the combined mass of Reactant A and H₂O.

Answer:

sh5barch shougi

Explanation:

Cannibalization is said to occur when a new product line reduces the sales of an existing line.

Cannibalization happens when a company introduces a new product or service that competes with its existing product or service. This can lead to a decrease in sales of the existing product or service, as customers may choose to purchase the newer or more attractive offering.

While cannibalization can be detrimental to a company's bottom line in the short term, it may be necessary to remain competitive in the long term. Companies must carefully consider the potential impacts of introducing a new product or service on their existing product lines and overall market position. Proper planning and market research can help mitigate the negative effects of cannibalization and maximize the benefits of introducing new offerings.

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Answer:

225kg.m.s

Explanation:

Momentum equals to mass times velocity

The propagation step in the free radical chlorination of methane is:

∙CH₃ + Cl∙ → CH₃Cl

In the free radical chlorination of methane, the propagation step is a crucial part of the overall reaction mechanism. It involves the interaction between a methyl radical (∙CH₃) and a chlorine radical (Cl∙), resulting in the formation of chloromethane (CH₃Cl).

During the propagation step, the methyl radical (∙CH₃) and chlorine radical (Cl∙) combine to produce chloromethane (CH₃Cl). This reaction occurs through the abstraction of a hydrogen atom from methane by the chlorine radical, forming a new C-Cl bond and generating a new methyl radical. The overall reaction can be represented as follows:

∙CH₃ + Cl∙ → CH₃Cl

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The number of moles of CO2 in a 220 gram sample can be calculated by dividing the mass of the sample by the molar mass of CO2.

The molar mass of CO2 (carbon dioxide) is calculated by adding the atomic masses of carbon (C) and oxygen (O) in one mole of CO2. The atomic mass of carbon is approximately 12.01 grams/mol, and the atomic mass of oxygen is approximately 16.00 grams/mol (rounded values).

Therefore, the molar mass of CO2 is approximately 12.01 + (16.00 x 2) = 44.01 grams/mol. To determine the number of moles of CO2 in a 220 gram sample, divide the mass of the sample (220 grams) by the molar mass of CO2 (44.01 grams/mol). The result will be the number of moles of CO2 in the given sample.

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1) Because ΔH is positive, the reaction is endothermic.

2) Yes, absorbed, because in endothermic reaction heat is absorbed.

3) Heat will be released 26.9 KJ

Enthalpy depends only on the system's composition, temperature, and pressure; it is unaffected by the system's history. It is a quality or state function that resembles energy and has energy-like properties (and is thus measured in units of joules or ergs).

Given reaction is

2HgO(s) → 2Hg(l) + O₂(g)  ΔH = 182KJ

1) Because ΔH is positive, the reaction is endothermic.

2) Yes, because heat is absorbed during endothermic reactions.

3)  Heat will be released 26.9 KJ

According to the reaction,

2 moles HgO of release =  182 KJ heat

2×216.59 HgO release =  182 KJ heat

64 g HgO release =  182×64/2×216.59 KJ heat

64 g HgO release = 26.9 KJ.

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Complete question is attached below

H2 has the highest coefficient.

Considering a balanced equation,

4 H2+2 C

————>2 CH4

=> The hydrogen molecule's (H2) coefficient is 4.

=> The carbon (C) coefficient is 2.

=> Methane CH4 has a coefficient of 2.

As a result, H2 has the greatest coefficient of 4, which is.

H2 has the highest coefficient, hence.

Gases made of hydrogen have no color or smell. It is quickly set ablaze. It burns with a light blue, nearly undetectable flame once lit. They are lighter than air, the vapors. It ignites easily at a variety of vapor/air concentrations. While asphyxiating easily due to the displacement of oxygen in the air, hydrogen is not poisonous. 

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Answer:

X = electrons from hydrogen

O (black) = electrons from oxygen

O (red) = electrons from when it was connected to a metal atom, hence why it has a negative charge

Soil is our life support system. Soils provide anchorage for roots, hold water and nutrients. Soils are home to myriad micro-organisms that fix nitrogen and decompose organic matter, and armies of microscopic animals as well as earthworms and termites.

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