A chemist dissolves 43.3 g Li2S (MM: 45.95 g/mol) to make 0.500 L of solution.
What is the molarity of her solution?

Answer: It´s question of resonance

Explanation: I think in case of crystal glass it have

certain structure. There are certain frequencies crystal can vibrate.

High sound frequencies resonate, also give energy to structure vibrations and it vibrates more strongly until structure breaks up.

Answer:

the angle of reflected light distorts the image to appear larger or smaller

The correct answer is option (c) Ti4+.

The species which are attracted to a magnetic field are known as paramagnetic species. If we talk about the given options, then we can see that there are only 3 species that are given. Out of these three, only Ti4+ is paramagnetic. How can we determine whether a species is paramagnetic or not? The species which contain unpaired electrons are paramagnetic in nature. If there are all paired electrons, then the species are diamagnetic. If we talk about Ti4+, then it contains 2 unpaired electrons, which makes it paramagnetic. This is the reason why the correct answer is Ti4+.In Ar, all the electrons are paired, which makes it diamagnetic. In O, there are 2 unpaired electrons, which makes it paramagnetic. How can we determine whether a species is paramagnetic or not? The species which contain unpaired electrons are paramagnetic in nature. If there are all paired electrons, then the species are diamagnetic.

Learn more about paramagnetic species at  brainly.com/question/29990302

#SPJ11

The pH at 25^oC of a 0.19 M  solution of potassium butanoate (KC, H,CO approximately 2.96.

Given that potassium butanoate, KC, H, CO, is a weak acid with pKa of 4.82 and a solution of 0.19 M concentration is provided, we can calculate the pH at 25°C as follows:

\(Kw = Ka × Kb\)

Kb = Kw/Ka

Where, Kw = 10^-14 (at 25°C)

Ka = 10^-pKa

We have the pKa value of potassium butanoate as 4.82.

∴ Ka = 10^-4.82

= 1.35 × 10^-5mol/L

Now, Kb = Kw/Ka

= 10^-14/1.35 × 10^-5

= 7.41 × 10^-10M

At 25°C, we can calculate the concentration of H+ ions by using the expression given below:

Ka = [H+] × [A-] / [HA]

[H+] = Ka × [HA] / [A-]

= (1.35 × 10^-5) × √0.19 / 0.19

= 1.1 × 10^-3M

Thus, pH = -log[H+]= -log(1.1 × 10^-3)≈ 2.96

Hence, the pH of 0.19 M potassium butanoate solution at 25°C is approximately 2.96.

To learn more about pH visit;

https://brainly.com/question/2288405

#SPJ11

To keep burning, fires require oxygen. Carbon dioxide is used in certain fire extinguishers to put out flames. Explanation: Because magnesium is higher on the reactivity scale than carbon, it is more reactive and eliminates oxygen from carbon dioxide (to give carbon and magnesium oxide).

Answer:

formula tree

Explanation:

Answer:

A simulation is an imitation. Simulations are helpful to scientists because they allow scientists to study occurrences more closely.

Explanation:

Explanation:

A simulation is a way of imitating a process or change in the real world to predict what will happen or explain what did happen and why, these days simulations are often run on computer,scientists use simulations to answer questions see how complex system works test ideas and make predictions, hope it helps^^

btw I'm no expert, I did research^^

The volume of the liquid from the graduated cylinder is 22.5 mL

The last option (22.5 mL) is the correct option

The question seems to be incomplete

The image that completes the question is shown in the attachment below.

From the image, we observe that the liquid meniscus is between the 20 mL and 25 mL marks. That means the volume will lie in this range.

NOTE: The meniscus of a liquid is the upward or downward curve seen at the top of a liquid in a container.

The type of curve shown in the image is a concave meniscus and the volume of the liquid is read from the bottom of the curve.

To read the value from the graduated cylinder, we will first determine the difference between two consecutive lines. Between the 20 mL and 25 mL mark (two thick lines), we have 5 spaces separated by thin lines.

The measure between two consecutive lines is the difference between two thick lines divided by number of spaces between them

∴ The measure between two consecutive lines = (25mL - 20mL) ÷ 5

The measure between two consecutive lines = 5mL ÷ 5 = 1 mL

Now, to read the position of the liquid,

Starting from the 20 mL mark, the liquid exceeds two more lines + half way to the next line ( that is 2mL + 0.5 mL)

∴ The position of the liquid is 20 mL + 2mL + 0.5 mL = 22.5 mL

Hence, the volume of the liquid from the graduated cylinder is 22.5 mL

Learn more here: https://brainly.com/question/19240870

Answer:

The answer is  22.5 mL

Explanation:

I hope this helps you :)

Answer:

Approximately \(1.7\; {\rm L}\).

Explanation:

Nitrogen \({\rm N_{2}}\, (g)\) reacts with hydrogen \({\rm H_{2}}\, (g)\) at a \(1:3\) ratio to produce ammonia \({\rm NH_3}\, (g)\):

\({\rm N_{2}}\, (g) + 3\; {\rm H_{2}}\, (g) \to 2\; {\rm NH_{3}}\, (g)\).

The ratio between the coefficient of \({\rm N_{2}}\, (g)\) and the coefficient of \({\rm H_{2}}\, (g)\) is:

\(\begin{aligned}\frac{n({\rm N_{2}})}{n({\rm H_{2}})} = \frac{1}{3}\end{aligned}\).

Under the ideal gas assumptions, the same ratio would apply to the volume of \({\rm N_{2}}\, (g)\) and \({\rm H_{2}}\, (g)\) in this reaction:

\(\begin{aligned}\frac{V({\rm N_{2}})}{V({\rm H_{2}})} = \frac{n({\rm N_{2}})}{n({\rm H_{2}})} = \frac{1}{3}\end{aligned}\).

\(\begin{aligned}V({\rm N_{2}})= \frac{1}{3}\, V({\rm H_{2}})\end{aligned}\).

Given that \(V({\rm H_{2}}) = 5.0\; {\rm L}\):

\(\begin{aligned}V({\rm N_{2}}) &= \frac{1}{3}\, V({\rm H_{2}}) \\ &= \frac{1}{3}\times 5.0\; {\rm L} \\ &\approx 1.7\; {\rm L}\end{aligned}\).

(Rounded to \(2\) significant figures.)

Answer:

I think it's D, cicada.

According to Oxford, a Hemipteran is "an insect of the order Hemiptera, such as an aphid, cicada, or leafhopper."

Hope this helps! I also hope it's not wrong, but I do not think it is.

Also please let me know if this is correct.

The reagent that could be added to the reaction mixture to increase the rate of substitution is b NaOH.

The reaction is an example of nucleophilic substitution. The reaction is slow under mild conditions and to increase the rate of substitution, a suitable reagent needs to be added to the reaction mixture. One such reagent that could be added to increase the rate of substitution is NaOH.The addition of NaOH can increase the rate of substitution of methanol for chlorine in 6-chloroethane. It does so by deprotonating the methanol to produce the methoxide ion (CH₃O⁻) which is a stronger nucleophile than methanol. This increases the nucleophilicity of the methoxide ion which then attacks the carbon atom in the 6-chloroethane molecule. This leads to the formation of the product, methyl ethyl ether (CH₃OCH₂CH₃), as shown below:

6-chloroethane + NaOH →CH₃OCH₂CH₃ + NaCl + H₂O

NaOH acts as a base in the reaction by deprotonating methanol to generate the more reactive nucleophile, methoxide ion (CH₃O⁻).

The methoxide ion then attacks the 6-chloroethane molecule, displacing the chlorine atom and leading to the formation of the product, methyl ethyl ether (CH₃OCH₂CH₃).

Hence, the correct answer is option (b) NaOH.

To learn more about nucleophilic substitution check the link below-

https://brainly.com/question/14052597

#SPJ11

When the suspension is let to stand, the dispersed nano-particles come apart from the dispersing phase. A suspension is a uniform mixture of a single material's particles dispersed across a second stage.

A suspension is a homogenous mixture made up of two or more components. Most of the nanoparticles are evenly distributed throughout the liquid and thus are plain to see with the na-ked eye. Instead of dissolving in the solution, the solute's particles remain suspended there.

How a suspension works is based on the idea of force dispersion, which includes converting force into heat or eradicating the effects that force would have had. Struts, dam-pers, & springs are employed to accomplish this.

To know more about Suspensions visit:

https://brainly.com/question/17650174

#SPJ4

Answer: I would say D. Carnivores have more available energy and are at a higher trophic level because they receive energy directy from herbiores.

Explanation: The grass gets its energy from the sun, the herbivore eats the grass which then gives the energy to the herbivore, then the carnivore eats the herbivore which gives the herbivore all of it's energy.

Hope This Helps!!! Have A Great Day!!!

The rate of reaction expressed in terms of reactants and products is; Rate=Δ[N2O]Δt=12Δ[N2]Δt=−12Δ[O2]Δt.

The term rate of reaction refers to the time taken for a reaction to take place. That is, how fast or slow a reaction progresses.

For the reaction, N2​ + 1/2O2​⟶N2​O, we can see that the rate of reaction expressed in terms of reactants and products is; Rate=Δ[N2O]Δt=12Δ[N2]Δt=−12Δ[O2]Δt.

Learn more about rate of reaction: https://brainly.com/question/8592296

Answer:

b. 600 k

hope it help

.

.

thank you so much.

tysm

Answer:

you shoudl ask this question more clearly?

Explanation:

Answer:

The 20th Element is Calcium (Ca).

The 20 Elements are:

Hydrogen

helium

lithium

berilium

boron

carbon

nitrogen

oxygen

flourine

neon

sodium

magnesium

aluminium

silicon

phosphorus

sulphur

chlorine

argon

potassium

calcium

A periodic trend connect a racial trend in American Society ad it affect the distribution of power, wealth, opportunity, and create enduring social stratifications.

It is important to understand racial trends in American Society as it helps in understanding the society better.

A trend is a shift or progression toward something new or different. Global migration is one of the most significant developments nowadays.

Today, 244 million individuals live in nations other than their native countries, which is three times the number in 1960. The world's migrant population would be the sixth largest country.

It should be noted that among the issue of racial trend is also the issue of black lives matter. This is important in order to end discrimination and also enhance the development in the country.

Learn more about American society on:

https://brainly.com/question/13323062

#SPJ1

Answer:

a. more than the earth pull on the moon sorry if false

Gas chromatography can be used to tentatively identify a compound from its retention time. D. Retention time.

What is chromatography? Chromatography is a method of separating out chemicals from a mixture by moving them through a material. Chromatography is a popular method for identifying and separating different chemical components in a complex mixture. The working principle of Chromatography is that the components of a mixture are separated based on their ability to adhere to a surface, i.e. the stationary phase, and their capacity to move across that surface, i.e. the mobile phase.

Gas chromatography is a powerful analytical method for the separation and quantitation of organic compounds based on their molecular characteristics. Gas chromatography is an essential method used in analytical chemistry for the qualitative and quantitative analysis of mixtures of substances. In gas chromatography, the components in a mixture are vaporized and then separated based on their distribution between a stationary liquid phase and a mobile gas phase that passes through the stationary phase. Each component is identified based on its retention time, which is the amount of time it takes for the component to travel through the column and reach the detector. Therefore, a compound can tentatively be identified by gas chromatography from its retention time. Answer: D. Retention time.

To know more about chromatography visit:

https://brainly.com/question/11960023

#SPJ11

Answer:

Oxygen is much smaller then Selenium, that is because of how high the charge density is.

Answer:

If you mean electron then O(8 electrons) is smaller than Se(34 electrons).

If you mean atomic mass then O(16) is still smaller than Se(78).

If   Valency then O and Se are the same(-2).

The overall transformation involved in the Wittig reactions can be best described as a rearrangement.

Wittig reactions are a type of organic chemical reaction that result in the formation of a new carbon-carbon double bond by converting a carbonyl compound, such as an aldehyde or ketone, into an alkene.

The process begins with the reaction of a phosphorus ylide, which is generated from a phosphonium salt, with the carbonyl compound.

The phosphorus ylide acts as a nucleophile and attacks the carbonyl carbon, leading to the formation of an intermediate called an oxaphosphetane.

This intermediate then undergoes a rearrangement, where the carbonyl oxygen is expelled, and the double bond is formed.

Therefore, the primary transformation in Wittig reactions involves the rearrangement of atoms within the molecule to produce the desired alkene product.

To know more about Wittig reactions, visit:

https://brainly.com/question/31567339

#SPJ11

Answer:

B.The cake rises as gas bubbles form in the baking cake preferably carbon dioxide

Answer:

1. When oil is burned, the carbon dioxide (CO2) produced comes from the carbon atoms present in the oil itself. Oil is a hydrocarbon, which means it consists of hydrogen and carbon atoms. During the combustion process, the carbon atoms combine with oxygen (O2) from the air to form carbon dioxide (CO2). So, the increased carbon dioxide in the glass container after burning the oil comes from the carbon in the oil.

2. The energy provided by soybean oil to the bus ultimately comes from the sun. Soybeans are plants that undergo a process called photosynthesis. During photosynthesis, plants use sunlight, water, and carbon dioxide from the air to produce glucose (a type of sugar) and oxygen. The glucose serves as an energy source for the plant and is stored in various forms, including oils like soybean oil. So, the energy in soybean oil can be traced back to the sun's energy captured by the plants during photosynthesis. The sun's energy is converted into chemical energy through this process, which is then transferred to the soybean oil.

Explanation:

Metals :-

Group 1A - Alkali metals ( highly reactive metals)

Non-metals :-

Group 17 - Halogens ( highly reactive non-metals )

answer: bits of rock rusting when exposed to oxygen and water

Explanation: i think because when it rains the water is left and freezes and night making the rock expand or start to Rust

The molarity, amount and volumes required are:

Molarity of a solution is defined as the number of moles of a solute dissolved in a given volume in litres of the solution.

molarity = 2/0.1

molarity = 20. M

molarity mass of potassium iodide = 166 g/mol

100 mL = 0.1 L

number of moles = 10/166 = 0.06 moles

Molarity = 0.06/ 0.1

Molarity = 0.6 M

.

Molarity = 0.427/0.855

Molarity = 0.50 M

1500 mL = 1.5 L

molar mass of aluminium carbonate = 87 g/mol

number of moles = 2340/87 = 26.9 moles

Molarity= 26.9/1.5

Molarity = 17.9 M

100 mL = 0.1 L

molarity = 2.0

number of moles = 2.0 × 0.1 = 0.2 moles

molar mass of potassium iodide = 166 g/mol

mass = number of moles × molar mass

mass = 0.2 × 166

mass of potassium iodide = 33.2 g

Number of moles of potassium iodide = 25/166 = 0.15 moles.

Volume = number of moles/molarity

Volume of water needed = 0.15/0.6

Volume of water needed = 0.30 L or 300 mL

Number of moles of aluminium carbonate = 10/87 = 0.115 moles.

Volume = number of moles/molarity

Volume of water needed = 0.115/0.3

Volume of water needed = 0.383 L or 383 mL

Therefore, the molarity, amount and volumes required are:

Learn more about molarity at: https://brainly.com/question/2927540

because we could be sick if don't get the shot there is a higher chance to have the flu

Answer:

Explanation:

Frozen water is known to have more volume, but less density. When water slowly gets unfrozen, it'd volume decreases and its density increases. Hence, when the water gets unfrozen, it's volume decreases.

heating system, water heater and any other gas, oil, or coal burning appliances serviced by a qualified technician every year. Do install a battery-operated or battery back-up CO detector in your home.