please answer urgent

Answer:

160.32 grams of Ca or 160 if rounded

Explanation:

Multiply moles of Ca by the conversion factor (molar mass of calcium) 40.08 g Ca/ 1 mol Ca, which then allows the cancelation of moles, leaving grams of Ca.

4 mol*40.08g/mol = 160.32 grams of Ca

please give thanks by clicking heart button :)

Answer:

\(\boxed {\boxed {\sf 160.32 \ g, \ 160 \ g, \ or \ 200 \ g }}\)

Explanation:

To convert from grams to moles, we must use calcium's molar mass, which can be found on the Periodic Table of Elements.

Now, we can use the molar mass as a ratio or fraction.

\(\frac{40.08 \ g \ Ca}{1 \ mol \ Ca}\)

This fraction can be multiplied by the number of moles, which is 4.

\(4 \ mol \ Ca * \frac{40.08 \ g \ Ca}{1 \ mol \ Ca}\)

When we multiply, the moles of calcium will cancel each other out.

\(4* \frac{40.08 \ g \ Ca}{1}\)

Since the fraction is over 1, we can just remove the denominator and write a simply multiplication equation.

\(4* 40.08 \ g \ Ca\)

\(160.32 \ g \ Ca\)

Depending on the teacher's instructions, the answer can be left as is or rounded.

If we round to the technically correct number of significant figures, it would be 1, because the original measurement of 4 moles has 1 sig fig. This would 200 grams, but that's a large amount to round.

We could also round to the nearest whole number. The 3 in the tenth place tells us to leave the whole number as it is. This would be 160 grams.

The answer could be 160.32 grams, 160 grams, or 200 grams, depending on rounding and significant figures.

the concentration of the pollutant will reach 2 lb/gal after 250 minutes.

To solve this problem, we need to find out when the concentration of the pollutant reaches 2 lb/gal in the tank.
Given:
Initial concentration = 1 lb/gal
Incoming concentration = 2.5 lb/gal
Incoming flow rate = 8 gal/min
Outgoing flow rate = 8 gal/min

Let's denote the time in minutes as t, and C as the concentration of the pollutant in lb/gal.

We can set up the equation:
Initial amount of pollutant + Incoming amount of pollutant = Outgoing amount of pollutant

(1 lb/gal) * (1000 gal) + (2.5 lb/gal) * (8 gal/min) * t = (2 lb/gal) * (8 gal/min) * t

Simplifying the equation:
1000 + 20t = 16t

Subtracting 16t from both sides:
1000 = 4t

Dividing both sides by 4:
250 = t

Therefore, the concentration of the pollutant will reach 2 lb/gal after 250 minutes.

Learn more about concentration from the given link:

https://brainly.com/question/17206790

#SPJ11

The balanced equation for carbon reacting with oxygen to form carbon dioxide is C + O2 → CO2In this reaction, carbon reacts with oxygen to form carbon dioxide.

The elements carbon (C) and oxygen (O2) are the reactants, and the product formed is carbon dioxide (CO2).To balance this equation, you need to make sure that the number of atoms on both sides of the equation is the same.

In this case, there is only one atom of carbon and two atoms of oxygen on the left side of the equation and one atom of carbon and two atoms of oxygen on the right side of the equation. To balance the equation, you can add a coefficient of 2 in front of carbon dioxide (CO2). This will give you the balanced equation 2C + O2 → 2CO2

Know more about carbon reacting:

https://brainly.com/question/10073022

#SPJ11

Answer:

Alkalis form chemical salts when they are combined with acids. e.g Sodium hydroxide  ,Potassium hydroxide  and Ammonia

Explanation:

Answer:

a substance which is alkali is a base that is soluble in water.an example is sodium hydroxide.

The molecular mass of glucose is 180 g. To make 1 M solution of glucose , you should dissolve 1 mole of glucose in 1 litre of water.

The molecular mass of glucose is 180.16 g/mole, therefore 1 mole is 180.16 grams.

So, to make a 1 M solution, you should take 1 mole = 180.16 g of glucose and make up to 1 litre.

Working glucose solution is prepared by diluting the stock solution.

It can also be said that 1 M glucose solution is  -

                       1 M glucose solution = 180 g / 1000 m L

                                                          = 0.18.

So, it is 0.18 % w/v.  

Glucose solution is a mixture of glucose and water. It is used to treat low blood sugar and the water loss without the electrolyte loss. Glucose solution is an isosmotic solution. If it is in large amount, it produces hypertonic effects on the system.

To learn more about glucose solution,

brainly.com/question/18011483

#SPJ4

Answer:

The Law of Definite Proportions ensures that chemical compounds are always created using the same proportions, regardless of the amount of the compound which is being made

Bond order of N2+ is 2.5. It is a diamagnetic substance.

Bond order is termed as the number of chemical bonds between a pair of the atoms. For example: In case of acetylene the bond order between the two carbon atoms is 3, in diatomic nitrogen the bond order is 3, and the C-H bond order is 1.

The bond order of N2+ is 2.5.

Bond order = 1 / 2[Nb - Na] Where, Nb = no. of electrons in bonding molecular orbital and Na = number of electrons in antibonding molecular orbital.

Bond order = 9-4 / 2

= 2.5

N2+ is diamagnetic in nature because they do not have any unpaired electrons they are having 14 electrons.

To know more about bond order here

https://brainly.com/question/29853110

#SPJ4

First of all, Z is unknown. I hope it is a mistake.

        Now, it is given that the element X has nineteen electrons. This proves that X is actually Potassium.

        As per the periodic table, both Potassium and Lithium belongs to group 1 as their valency is 1 because of the presence of only one electron in the outermost shell of electrons i.e., they lose an electron during a chemical reaction to form a stable compound. Furthermore, both are metallic.

        Magnesium belongs to group 2 and hence its valency is two, which is different from potassium though it is metallic. Similiarly, bromine belongs to group 17 and gains one electron during a reaction in contrast to potassium.

( No internal links available for reference. For clarification, check the periodic table).

The balanced reaction of this chemical reaction is as follows :

• As we can see, this is a double-displament reaction

Answer:

D: Acid rainwater seeps into the ground and dissolves limestone

To determine the volume of N2(g) produced by the complete decomposition of 1 mole of nitroglycerin (C3H5N3O9), we need to consider the balanced chemical equation for the decomposition reaction.

The balanced equation for the decomposition of nitroglycerin is as follows:

4 C3H5N3O9(s) → 12 CO2(g) + 10 H2O(g) + 6 N2(g) + O2(g) From the balanced equation, we can see that for every 4 moles of nitroglycerin, 6 moles of N2(g) are produced. Since we are considering the decomposition of 1 mole of nitroglycerin, we can use this ratio to determine the moles of N2(g) produced, which is 6/4 = 1.5 moles of N2(g). Now, at STP (Standard Temperature and Pressure), 1 mole of any ideal gas occupies 22.4 liters. Therefore, 1.5 moles of N2(g) would occupy approximately 33.6 liters

Learn more about decomposition reaction here: brainly.com/question/2285034

#SPJ11

6.61 grams of NaOBr must be dissolved in 488 mL of 0.260 M HOBr to produce a buffer solution with pH 8.30.

Bromine reacts with sodium hydroxide to produce sodium hypobromite (NaOBr), which changes the primary amide into an isocyanate intermediate.

To calculate the mass of NaOBr needed to produce a buffer solution with a pH of 8.30, we need to use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

where pKa is the acid dissociation constant of HOBr, [A-] is the concentration of the conjugate base (OBr-) and [HA] is the concentration of the acid (HOBr).

We can rearrange this equation to solve for [A-]/[HA]:

[A-]/[HA] = 10^(pH - pKa)

We know the pH of the buffer solution (pH = 8.30) and the pKa of HOBr is 8.65. Therefore:

[A-]/[HA] = 10^(8.30 - 8.65) = 0.425

Since the initial concentration of HOBr is 0.260 M, we can set up the following equation to find the concentration of OBr- needed:

0.425 = [OBr-]/0.260

[OBr-] = 0.1105 M

Now, we can use the volume of the solution and the concentration of OBr- to calculate the moles of NaOBr needed:

moles of NaOBr = moles of OBr- = [OBr-] x volume

moles of NaOBr = 0.1105 M x 0.488 L = 0.0538 moles

Finally, we can use the molar mass of NaOBr to convert moles to grams:

mass of NaOBr = moles of NaOBr x molar mass of NaOBr

mass of NaOBr = 0.0538 moles x 122.89 g/mol = 6.61 g

Therefore, 6.61 grams of NaOBr must be dissolved in 488 mL of 0.260 M HOBr to produce a buffer solution with pH 8.30.

Learn more about naobr

https://brainly.com/question/20714307

#SPJ1

Answer: sound can slow down, so when it travels through all of that it's muffled and kind of blocked. sound travels at 332 metres per second so it's hard to stop the sound

Explanation:

The speed of sound will be greatest in the solid rock, followed by the lake and then least in air.

This is as a result of molecules being most closely packed in solids, followed by liquids and then gases.

The speed of sound depends on the type of medium through which it is traveling. Sound waves travel most quickly through solids, followed by liquids and then by gases.

In solids, the molecules are closely packed than in liquids and gases. Due to this advantage, they quickly pass the energy of vibrations to nearby particles, hence, sound waves travel most quickly through solids.

In liquids, the molecules are less closely packed than in solids and more closely packed compared to gases. Therefore, sound waves travel faster in liquids than in gases.

In gases, the molecules are farthest apart. Hence, sound waves travel less quickly in gases compared to liquids and solids.

From the question, sound waves travels through solid rock, then through a lake and then air.

The rock is a solid, lake is liquid and air is mixture of gases.

Hence, as explained above, the speed of sound will be greatest in the solid rock, followed by the lake and then air.

Learn more on speed on sound in different media here: https://brainly.com/question/1641593

Answer:

Cancer

Explanation:

Cancer is a genetic disease—that is, it is caused by changes to genes that control the way our cells function, especially how they grow and divide. Genetic changes that cause cancer can happen because: of errors that occur as cells divide.

The characteristics and the type of molecular bond they describe:

1. Bonds found in Halite (between Na⁺ and Cl⁻): Ionic bond

2. Bonds found between Si and O in the Si-O tetrahedron: Covalent bond

3. Bonds inside the water molecule (between the H and O): Covalent bond

4. Bonds that exist between two water molecules: Hydrogen bond

5. Strongest bond type: Covalent bond

6. Weakest bond type: Van der Waals bond

7. Bonds that are used by water to dissolve salt: Ionic bond

The ionic bond is a type of molecular bond found in halite (between Na⁺ and Cl⁻). The Si-O tetrahedron is held together by a covalent bond. The bond inside the water molecule (between the H and O) is also a covalent bond. The hydrogen bond is the type of bond that exists between two water molecules. The covalent bond is the strongest bond type, while the van der Waals bond is the weakest bond type. Water uses the ionic bond to dissolve the salt.

Learn more about bonds: https://brainly.com/question/32306693

#SPJ11

Explanation:

B. HCIO these is the answer

The option that is a conjugate acid of ClO would be (B), HCIO..

A conjugate acid is formed when a base gains a proton. In this case, the base is ClO, which has a negative charge. When ClO gains a proton, it becomes HCIO, which has a positive charge.

The other options are not conjugate acids of ClO because they do not have a positive charge. CL is the neutral form of chlorine, and it cannot gain a proton to become a conjugate acid. Clot is not a chemical compound, and it does not exist.

In conclusion, option B is correct.

Find out more on conjugate acids at https://brainly.com/question/12584785

#SPJ6

Answer: A suspension is a heterogenous mixture containing large particles that will settle on standing. Sand in water is an example of a suspension. A solution is a homogenous mixture of two or more substances where one substance has dissolved the other.

An acid and a base react, to form salt and water in a neutralization reaction. The correct answer is neutralization.

Neutralization reaction is a chemical reaction that takes place when an acid and a base are mixed, resulting in the creation of a neutral solution, a salt, and water. The acid and base cancel each other out, producing a solution that is neither acidic nor basic.

An example of a neutralization reaction is the reaction between hydrochloric acid and sodium hydroxide, which creates salt and water as the only products.

The reaction can be represented as follows:

\(HCl\)  + \(NaOH\) →\(NaCl\) + \(H_2O\)

An acid is a compound that contains hydrogen ions\((H^+)\) and can dissolve in water to produce a sour taste.

Bases are chemical substances that generate hydroxide ions \((OH^-)\) when dissolved in water.

Salt is a compound that can be formed by combining an acid and a base. Therefore, "neutralization" is the correct answer.

For more such questions on neutralization, click on:

https://brainly.com/question/23008798

#SPJ11

This question involves the concepts of time period and tangential speed.

The tangential speed of the object is "5.1 x 10⁴ m/s".

The following formula gives the time period of the object:

\(T=\frac{2\pi}{\omega}\\\\\)

\(\omega = \frac{2\pi}{T}\)

where,

Therefore,

\(\omega=\frac{2\pi}{2.2\ x\ 10^4\ s}\\\\\omega=2.86\ x\ 10^{-4}\ rad/s\)

Now, the tangential speed can be given by the following formula:

\(v=r\omega\)

where,

Therefore,

\(v=(1.8\ x\ 10^8\ m)(2.86\ x\ 10^{-4}\ rad/s)\)

v = 5.1 x 10⁴ m/s

Learn more about tangential speed here:

https://brainly.com/question/17025846

#SPJ4

Answer: 5.1 x 10⁴ m/s

Explanation:

edge 2023

The atom which has four unpaired electrons are iron (Fe). Option E is correct.

Iron (Fe) is the chemical element having atomic number 26. It is a transition metal and belongs to Group 8 on the periodic table. Iron is known for its abundance and widespread use due to its desirable properties.

In terms of its electron configuration, the ground state electron configuration of iron is [Ar] 3d₆ 4s₂. This means that iron has a total of 26 electrons. The 3d orbital, which can hold a maximum of 10 electrons, has six electrons occupying it, leaving four unpaired electrons available for bonding.

The presence of four unpaired electrons in the 3d orbitals allows iron to form various compounds and exhibit different oxidation states. These unpaired electrons can participate in bonding with other atoms, enabling iron to engage in chemical reactions and form coordination complexes. The ability of iron to readily donate or accept electrons makes it an important element in redox reactions and catalytic processes.

Hence, E. is the correct option.

To know more about unpaired electrons here

https://brainly.com/question/32071331

#SPJ4

Answer/Explanation:

A) The independent(test) variable controls the dependent variable. A good way to think about this is that the independent variable has nothing that effects itself. The dependent variable is 'dependent' or reliant on the independent variable.

Answer:

A

Explanation:

The following battery is not rechargeable is A. alkaline.

Alkaline batteries are primary batteries that have a very long life span and are commonly used in households, these batteries are designed for one-time use only and cannot be recharged. Zinc, manganese oxide, and potassium hydroxide are the primary constituents of alkaline batteries. Because of their long shelf life and relatively high capacity, they are widely used in low-drain and high-drain devices. Lithium-ion batteries, lead-acid batteries, and nickel-cadmium batteries, on the other hand, are all rechargeable.

Lithium-ion batteries are used in a variety of electronic devices, including cellphones, laptops, and cameras. Lead-acid batteries are often used in automobiles and boats. Nickel-cadmium batteries, on the other hand, are used in power tools and portable electronic devices, among other things. So therefore the correct answer is A. Alkaline batteries are not rechargeable.

Learn more about lithium-ion batteries at:

https://brainly.com/question/31115504

#SPJ11

The following that would not be part of a study plan to learn chemistry is (B) Skip your instructor's study hours.

All of the other options are good study habits that can help you learn chemistry. Studying a little bit every day helps you retain the information better. Forming a study group can help you learn from each other and stay motivated. Reading the chapter before class gives you a foundation to build on during lecture. And working the sample problems helps you practice what you've learned.

However, skipping your instructor's study hours is not a good idea. Your instructor is there to help you learn the material, and they can give you personalized feedback on your work. If you're struggling with the material, skipping their study hours will only make it harder for you to succeed.

So, if you're serious about learning chemistry, make sure to include all of the good study habits in your plan, and skip the bad ones.

Here are some additional tips for creating a study plan to learn chemistry:

Therefore, (B) Skip your instructor's study hours is the correct answer.

To know more about study plan refer here :    

https://brainly.com/question/28243846#

#SPJ11                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

Answer:

The molecules of the liquid collide with the molecules of solid, gradually breaking the bonds between the molecules in the solid and causing the ice to melt.

Answer:

This means that the wave is bigger because amplitude is the hight of the crest of the wave!

Explanation:

SO IT MEANS THE WAVE IS BIGGER AND TALLER :D

The wavelength of light required to dislodge an electron from the surface of cesium is approximately 600.7 nm.

To find the wavelength, we can use the equation E = hc/λ, where E is the energy per photon, h is Planck's constant (6.626 x 10^-34 Js), c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength. First, we need to convert the given energy (207 kJ/mol) to energy per photon in Joules.

Since 1 mole of photons contains Avogadro's number (6.022 x 10^23) of photons, we can divide the energy by this number:
(207 x 10^3 J/mol) / (6.022 x 10^23 photons/mol) ≈ 3.44 x 10^-19 J/photon

Now we can use the equation:
λ = hc/E
λ = (6.626 x 10^-34 Js) * (3.00 x 10^8 m/s) / (3.44 x 10^-19 J)
λ ≈ 5.76 x 10^-7 m

To express the wavelength in nanometers, we multiply by 10^9:
λ ≈ 576 nm (rounded to three significant figures)

The wavelength of light required to dislodge an electron from the surface of cesium via the photoelectric effect is approximately 576 nm.

To know more about wavelength, click here

https://brainly.com/question/31143857

#SPJ11

Answer:

C

Explanation:

Brainliest

I tried my best

At room temperature, there are 11 elements that exist in gaseous form. These elements include oxygen, nitrogen, hydrogen, chlorine, helium, neon, argon, krypton, xenon, fluorine and radon. Gases are made up of molecules that are in constant random motion, and the particles are usually spaced far apart from one another.

There are three common states of matter: solid, liquid and gas. Gases are the most compressible state of matter and can occupy any space and also can diffuse very quickly. Gases possess various chemical and physical properties, such as volume, pressure, and temperature. These properties may be used to calculate various gas laws, such as Boyle's law, Charles's law, Avogadro's law, and the ideal gas law. Gases can be used in various applications, such as fuel, refrigeration, lighting, and medical procedures. Helium, for instance, is used to fill balloons because it is lighter than air and does not burn. Nitrous oxide is used as a dental anesthetic, and oxygen is used to sustain life. Radon, on the other hand, is a radioactive gas that is found in soil and rocks and can cause cancer.

To know more about gaseous state visit:

https://brainly.com/question/31195203

#SPJ11