What is the molar mass of (NH4)2 CO?
A. 46.06
B. 64.11
C. 36.01
D. 28.01

Answer:

oooooooooougifufofhhdykddykyd

Answer:

10%

Explanation:

Out of the original layer, only ten percent is transferred to the next

No, firstly bc stainless steel and carbon steel mixed with different things, high-density metals and carbon.

High-density metals and carbon both has different density which will affect the steel when they combined with iron. So it cant be the same.

Explanation:

more saturated than solution one

Answer:

3rd option

Explanation:

a beaker filled with 100 ml 100 ml of a 3.0 m 3.0 m chloride solution and some magnesium metal. The pupil witnesses bubbles and the metal magnesium dissipating. 0.734 L / 734 mL.

Magnesium supports muscle and neuron function as well as energy synthesis in the body, among many other vital functions. Typically, low magnesium levels don't result in any symptoms. However, persistently low levels can raise the risk of hypertension, heart disease.

Briefing

We'll start by figuring out how many moles of hydrochloric acid, or HCl, are present in 20.0 mL of the a 3.00 M solution.

This is illustrated below:

Molarity of hcl = 3 M

Volume = 20 mL = 20/1000 = 0.02 L

Mole of HCl =..?

Molarity = mole /Volume

3 = mole /0.02

Cross multiply

Mole of HCl = 3 x 0.02

Mole of HCl = 0.06 mole.

Next, we shall determine the number of mole of Hydrogen gas, H2 produced from the reaction of 0.06 mole of HCl. This can obtain as follow:

Mg + 2HCl —> MgCl2 + H2

From the balanced equation above,

2 moles of HCl reacted to produce 1 mole H2.

Therefore, 0.06 mole of HCl will react to produce = (0.06 x 1)/2 = 0.03 mole

Therefore, 0.03 mole of H2 was produced.

Finally, we shall determine the volume of the balloon by calculating the volume of Hydrogen gas, H2 in the balloon.

The volume of H2 can be obtained by using the ideal gas equation as follow:

Pressure (P) = 1 atm

Temperature (T) = 25°C = 25°C + 273 = 298K

Number of mole (n) of H2 = 0.03 mole

Gas constant (R) = 0.0821 atm.L/Kmol

Volume (V) of H2 =?

PV = nRT

1 x V = 0.03 x 0.0821 x 298

V = 0.734 L = 734 mL.

Therefore, the volume of the balloon is 0.734 L or 734 mL

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Gas chlorine is a chemical compound used as a disinfectant for water treatment. It is commonly used in water treatment plants because of its ability to effectively kill harmful bacteria and viruses. Gas chlorine is considered 100 percent available chlorine, as it contains a high concentration of chlorine gas.

When added to water, the gas dissolves and forms hypochlorous acid, which is a powerful disinfectant. This acid is effective in killing bacteria, viruses, and other harmful microorganisms in water. Chlorine gas is also preferred because it is easy to handle, store, and transport.

It is also cost-effective, making it a popular choice for water treatment. It is important to handle chlorine gas with care, as it is toxic and can cause health hazards if not used properly.  Gas chlorine is a highly effective disinfectant for water treatment and is considered to be 100 percent available chlorine.

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Atomic spectrum is the type of spectrum which is produced when electromagnetic radiation is emitted or absorbed as electrons change energy levels in atom.

This is a term which is referred to as a subatomic particle which has a negative charge and is involved in chemical reactions.

In a scenario where an electromagnetic radiation is emitted or absorbed as electrons change energy levels in atom, atomic spectrum is produced and has also been shined through or originates from a material in which it either emits or absorbs light of a specific wavelength thereby making it the correct choice.

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Explanation:

The claim that hydrogen chloride (HCl) would be much stronger than nitric acid (HNO3) due to opposing dipole forces is incorrect.

Both HCl and HNO3 are strong acids, meaning that they dissociate completely in water to produce H+ ions. The strength of an acid is determined by the degree to which it dissociates in water. In other words, the stronger the acid, the more H+ ions it produces in water.

The dissociation of HCl and HNO3 in water can be represented as follows:

HCl + H2O → H+ + Cl-

HNO3 + H2O → H+ + NO3-

As we can see, both HCl and HNO3 produce H+ ions in water. Therefore, the strength of an acid cannot be solely determined by its dipole forces.

In addition, it's important to note that HCl is a much more volatile and corrosive acid than HNO3. It can cause severe respiratory and skin irritation when it is inhaled or comes into contact with skin. Therefore, switching HNO3 for HCl could be dangerous and should not be done without proper precautions and expert knowledge

Answer: A

Explanation:

i just took the quiz and it was right!

Answer: D

Explanation:

Water is comprised of 2 Hydrogen atoms and 1 Oxygen atom. This gives us a total of 8 valence electrons to form bonds with.

Because Hydrogen is in first row of elements it can only hold a total of two electrons. This means each Hydrogen holds 2 electrons.

But that means there are four more electrons. VSEPR theory is basically how electron repulsion causes atoms to arrange in different ways.

There will be four electrons left on the oxygen because they can not go anywhere else. This will cause the hydrogen molecules to move away from the lone electrons and cause a bent geometry rather than a straight-line geometry.

Answer:

mass number

Explanation:

yeah mass number is the total of protons and neutrons

for example carbon has 12 proton and 12 neutrons therefore it's mass number is 24

i hope this is what you're looking for

Answer:

d

ionic bond is formed when there is transfer of electrons and is composed of a positive cation and a negative anion

The best answer for the most reasonable synthesis of the target molecule below from ethyl acetate and any other reagents and starting materials needed is d.) Both a.) and b.)

The best approach for the synthesis of the target molecule from ethyl acetate involves a two-step reaction. First, ethyl acetate reacts with NaOEt (sodium ethoxide) in ethanol to form an intermediate compound. Then, this intermediate compound is further reacted with CHBr3 (bromoform) to form the target molecule. This synthesis is represented in answer choice a.).

Alternatively, the synthesis can be achieved by a three-step reaction sequence. In the first step, ethyl acetate is reacted with LDA (lithium diisopropylamide) to form an enolate intermediate. This intermediate is then reacted with CHBr3 to form a bromoalkene. Finally, the bromoalkene is oxidized using PCC (pyridinium chlorochromate) to form the target molecule. This synthesis is represented in answer choice b.).

Therefore, both answer choices a.) and b.) are reasonable approaches for the synthesis of the target molecule from ethyl acetate.

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The complete question is:

Select the best answer for the most reasonable synthesis of the target molecule below from ethyl acetate and any other reagents and starting materials needed. (Image attached)

True. Many hazardous materials cannot be identified solely by their odor, taste, or color.

Hazardous materials can come in various forms, and their identification often requires more advanced techniques and tools such as chemical analysis, spectroscopy, or specialized testing. Relying solely on sensory cues like odor, taste, or color is not sufficient and can be misleading or dangerous. It is important to follow proper safety protocols and use appropriate testing methods to accurately identify hazardous materials.

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Answer:

0.664 g are formed by the reaction.

Explanation:

First of all, we determine the reaction:

Mg + CO₂  →  MgO  + CO

We need to determine the moles of the CO₂ by the Ideal Gases Law.

We convert to L, the volume → 400 mL = 0.4L

T° → 23°C + 273 = 296K

P . V = n . R .T

n = P . V / R .T

n = (1 atm . 0.4L) / (0.082 . 296K) → 0.0165 moles

Moles of Mg → 2.5 g . 1mol / 24.3g = 0.103 moles

As ratio is 1:1, CO₂ is the limiting reactant.

For 1 mol of Mg, we need 1 mol of gas

Then, for 0.103 moles of Mg, we need 0.103 moles of gas, but we only have 0.0165 moles.

If we see the product side, ratio is also 1:1

0.0165 moles of CO₂ must produce 0.0165 moles of MgO.

We convert the moles to mass → 0.0165 mol . 40.3 g /1mol = 0.664 g

Answer:

the answer is false(that it is not true)

M2 refers to the money supply measure known as M2 money stock.

The FOMC's decisions and actions can impact M2 through its control over interest rates, open market operations, and the influence on economic conditions and confidence. Changes in monetary policy by the FOMC aim to manage the money supply and promote price stability, economic growth, and employment.

M2 is a broad measure of the money supply that includes cash, checking and savings deposits, money market funds, and other time deposits.

The Federal Open Market Committee (FOMC) is a committee within the U.S. Federal Reserve System that is responsible for making decisions regarding monetary policy, including setting interest rates and implementing measures to manage the money supply.

The actions taken by the FOMC can have an impact on M2 and the broader money supply in the economy. Here's how:

1. Open Market Operations: The FOMC conducts open market operations by buying or selling government securities in the open market. When the FOMC buys government securities, it injects money into the banking system, increasing bank reserves and potentially leading to an expansion of M2.

2. Interest Rate Policy: The FOMC sets the target federal funds rate, which is the interest rate at which depository institutions lend and borrow funds from each other overnight. By adjusting the federal funds rate, the FOMC influences borrowing costs for banks and, in turn, affects their lending practices. Changes in interest rates can impact the demand for loans and affect the growth of M2.

3. Impact on Confidence and Spending: The FOMC's actions and communications can influence consumer and business confidence. When the FOMC signals a more accommodative monetary policy stance, it can encourage borrowing and spending, potentially leading to an increase in the growth of M2.

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Answer:

24.47 L

Explanation:

Using the general gas law equation:

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = 0.0821 Latm/molK

T = temperature (K)

According to the provided information in this question,

P = 1.0 atm

V = ?

n = 1 mol

T = 25°C = 25 + 273 = 298K

Using PV = nRT

V = nRT ÷ P

V = 1 × 0.0821 × 298 ÷ 1

V = 24.465 ÷ 1

V = 24.465

V = 24.47 L

Answer:skin cream

Explanation:

the independent variable is the variable that is always changed or manipulated. in this case the skin cream is the independent variable.

The empirical formula for at least four ionic compounds that could be formed from the following Fe²⁺, CIO₃⁻, Pb⁴⁺, CO₃²⁻ is: FeCO₃, Fe(ClO₃)₂, Pb(CO₃)₂, and Pb(ClO₃)₄.

Empirical formula is defined as the formula which represents the simplest whole-number ratio of atoms in a molecule. An ionic compound is a chemical compound comprising ions held together by electrostatic forces known as ionic bonding.

Fe²⁺ represents ferrous ion, CIO₃⁻ represents chlorate ion, Pb⁴⁺ represents lead (IV) ion, and CO₃²⁻ represents carbonate ion.

Let's determine the empirical formula for each of the ionic compounds formed:

Fe²⁺ with CO₃²⁻ : Since Fe²⁺ has a charge of 2 and CO₃²⁻ has a charge of -2, the empirical formula for this ionic compound is FeCO₃.

CIO₃⁻ with Fe²⁺ : Since CIO₃⁻ has a charge of -1 and Fe²⁺ has a charge of 2, the empirical formula for this ionic compound is Fe(ClO₃)₂.

Pb⁴⁺ with CO₃²⁻ : Since Pb⁴⁺ has a charge of 4 and CO₃²⁻ has a charge of -2, the empirical formula for this ionic compound is Pb(CO₃)₂.

Pb⁴⁺ with CIO₃⁻ : Since Pb⁴⁺ has a charge of 4 and CIO₃⁻ has a charge of -1, the empirical formula for this ionic compound is Pb(ClO₃)₄.

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Drawing several Lewis structures of a molecule connected by double arrow symbols (↔) implies that the molecule exhibits resonance. Resonance occurs when multiple Lewis structures can be written for a molecule, representing different arrangements of electrons. The actual structure of the molecule is a hybrid or combination of these resonance structures, and the double arrow signifies the delocalization or sharing of electrons between different atoms or regions within the molecule.

Resonance is a concept used in chemistry to describe situations where multiple Lewis structures can be drawn for a molecule, but none of the individual structures accurately represent the molecule's true electronic structure. Instead, the actual structure is a hybrid or combination of these resonance structures.

When drawing resonance structures, double arrow symbols (↔) are used to connect the different structures. The double arrow indicates that the molecule can exist in all of the resonance forms simultaneously, with electron delocalization or sharing occurring between different atoms or regions within the molecule.

The presence of resonance is often observed in molecules with conjugated systems, such as benzene or carbonate ions. The resonance stabilization provided by electron delocalization contributes to the stability and unique properties of these molecules.

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For average speed, we divide the total distance covered by the total time taken.

After doing that, you will see that Jane has the lowest average speed.

The correct answer is the amount of sodium chloride needed to make this eye solution isotonic with tears is approximately 1.85 grams. Rounding it up to the nearest whole number gives us the answer as 2. Hence, the correct option is 22.

The given solution is a hypotonic solution as the solution's tonicity is lower than that of the tears. The tears contain 0.9% w/v of NaCl, which is isotonic with tears. So, to make the given solution isotonic, the amount of sodium chloride needs to be added.

The concentration of NaCl in tears is 0.9% w/v. Additional Information: We know that % w/v is the amount of solute present in grams per 100 ml of the solution. Therefore, 0.9% w/v means 0.9 grams of NaCl is present in 100 mL of tears.

To make 30 ml of isotonic solution, we can use the following formula: Equivalent weight of NaCl = 58.5/2 = 29.25 (as NaCl ionizes to give Na+ and Cl- ions)Moles of NaCl required to make 30 ml isotonic solution = 0.9 × 30 / 1000 = 0.027Moles of Na+ and Cl- ions present in 30 mL of isotonic solution = 2 × 0.027 = 0.054

A number of grams of NaCl needed to prepare 30 mL of isotonic solution is calculated as follows:0.054 g = (0.027 x 29.25 x X) / 1000Where X is the amount of NaCl required to make 30 mL isotonic solution. Solving this equation gives us: X = 1.85 g (approx). Therefore, the amount of sodium chloride needed to make this eye solution isotonic with tears is approximately 1.85 grams. Rounding it up to the nearest whole number gives us the answer as 2. Hence, the correct option is 22.

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The absolute amount of the discrepancy or simply error between the measured value and the actual value is multiplied by 100 and divided by the actual value to determine the percent error.

Follow these easy procedures to determine the error rate-

1. Don't take into consideration any minus (-) signs when calculating the inaccuracy (by deducting the predicted value from the actual value). take the error's absolute value, etc.

Approximate Value - Exact Value = Absolute Error

2. Subtract the mistake from the accurate figure (sometimes, we may get a decimal number).

3. Relative error is the difference between the precise and approximative values.

4. Add a "%" following the conversion to a percentage (by multiplying by 100).

|Approximate Value - Exact Value|/Exact Value 100% Percent Error

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Answer:

230 90Th

Explanation:

A careful observation of the equation given in question shows that 234 92U is undergoing alpha decay. This means that the resulting daughter nuclei will have a decrease of 4 in the mass number and a decrease of 2 in the atomic number.

Please see attached photo for further details.