pls help I’ll give allot of points I need all the answers pls anybody help!!!

Answer:

8.02 g of HCl could be left over by the chemical reaction

Explanation:

We propose the reaction:

HCl(aq) + NaOH (s) → NaCl (aq) + H₂O (l)

Ratio is 1:1. First of all, we determine the moles of reactants:

14 g . 1mol / 36.45g = 0.384 mol of acid

6.55 g. 1mol / 40g = 0.164 mol of base

If a determined mass of HCl, could be left; this means that the acid is the excess reagent.

For 0.164 moles of NaOH, we need 0.164 moles of HCl.

As we have 0.384 moles, (0.384 - 0.164) = 0.220 moles of acid are left over in the reaction. We convert the moles to mass:

0.220 mol . 36.45 g /1mol = 8.02 g

Answer:

I dont know, sorry!

Answer:

The stigma.

Explanation:

You're welcome. :)

Answer:

332.918g O2

Explanation:

I'm having some issues with the work however, your final answer should be 332.918g O2

Hope this helped!

Answer:

True

Explanation:

magnesium and copper react with dilute acids to make salts and hydrogen gas

Answer:

Yea pretty much it's 3.49

Explanation:

Answer:

It is important to record the crime scene in order to view how it was originally found so when items are removed, it can still be investigated and viewed.

Explanation:

Answer:

(1). CH3-CH=N-CH2-CH2-CH3.

(2). CH3-CH2-CH =N-CH2-CH3.

(3). CH3-CH2-CH2-CH=N-CH3.

(3). CH3-CH2-CH2-CH2-CH=N.

Explanation:

This is a spectroscopy question. Spectroscopy is an important part of chemistry which is used in the identification of chemical compounds.

So, without mincing words let's dive straight into the solution to the question.

Starting from values of IR given, the absorption at 1620-1680 cm^-1 shows the presence of C = N.

From the question, it is given that there is no signal showing on the spectrum at 3010 - 3090 cm^-1. The absorption at 3010 - 3090 cm^-1 shows the presence of N - H. But, it is not show on the spectrum. Hence, there is no N - H in the compound. That's, there are no Hydrogen atoms attached to Nitrogen atom.

We are given that the mass spectrum of compound A shows the molecular ion at m/z 85, therefore the molar mass of the compound is 85.

Also, from the question the elements present are carbon, Hydrogen and Nitrogen. Therefore, the compound is likely to be C5H11N.

The likely compounds are given below;

(1). CH3-CH=N-CH2-CH2-CH3.

(2). CH3-CH2-CH =N-CH2-CH3.

(3). CH3-CH2-CH2-CH=N-CH3.

(3). CH3-CH2-CH2-CH2-CH=N.

Answer:

d.3.0

Explanation:

Step 1: Calculate the final volume of the solution

The final volume is equal to the sum of the volumes of the initial HCl solution and the volume of distilled water.

V₂ = 100 mL + 100 mL = 200 mL

Step 2: Calculate the final concentration of HCl

We will use the dilution rule.

C₁ × V₁ = C₂ × V₂

C₂ = C₁ × V₁/V₂ = 0.002 M × 100 mL/200 mL = 0.001 M

Step 3: Calculate the pH of the final HCl solution

Since HCl is a strong acid, [H⁺] = HCl. We will use the definition of pH.

pH = -log [H⁺] = -log 0.001 = 3

Answer:

The ratio of f at the higher temperature to f at the lower temperature is 5.356

Explanation:

Given;

activation energy, Ea = 185 kJ/mol = 185,000 J/mol

final temperature, T₂ = 525 K

initial temperature, T₁ = 505 k

Apply Arrhenius equation;

[tex]Log(\frac{f_2}{f_1} ) = \frac{E_a}{2.303 \times R} [\frac{1}{T_1} -\frac{1}{T_2} ][/tex]

Where;

[tex]\frac{f_2}{f_1}[/tex]  is the ratio of f at the higher temperature to f at the lower temperature

R is gas constant = 8.314 J/mole.K

[tex]Log(\frac{f_2}{f_1} ) = \frac{E_a}{2.303 \times R} [\frac{1}{T_1} -\frac{1}{T_2} ]\\\\Log(\frac{f_2}{f_1} ) = \frac{185,000}{2.303 \times 8.314} [\frac{1}{505} -\frac{1}{525} ]\\\\Log(\frac{f_2}{f_1} ) = 0.7289\\\\\frac{f_2}{f_1} = 10^{0.7289}\\\\\frac{f_2}{f_1} = 5.356[/tex]

Therefore, the ratio of f at the higher temperature to f at the lower temperature is 5.356

Answer:

See explanation and image attached

Explanation:

The reaction of bromine molecule with an alkene passes through a bridged intermediate known as the brominium ion.

It is a cyclic intermediate that contains a positively charged bromine ion as i have shown in the image attached.

The brominium ion is first formed during the bromininaton of alkenes.

Answer:

ExpC

H

4

+  

2

O

2

→

C

O

2

+  

2

H

2

O

This is the balanced reaction equation for the combustion of methane.

Explanation:

The Law of Conservation of Mass basically states that matter can neither be created nor destroyed. As such, we must be able to show this in our chemical reaction equations.

If you look at the equation above, you'll see an arrow that separates the reaction equation into two parts. This represents the direction of the reaction.

To the left of the arrow, we have our reactants.

To the right of the arrow, we have our products.

The quantity of each individual element in the left must equal the quantity of each individual element in the right.

So if you look below, you'll see the unbalanced equation, and I'll try to explain how to balance the reaction.

C

H

4

+  

O

2

→

C

O

2

+  

H

2

O

Our reactants in this equation are  

C

H

4

and  

O

2

.

Our next step is to break these down into individual atoms.

We have:

1 C atom, 4 H atoms & 2 O atoms.

If you're confused by this, look to see the little number to the bottom right of each element, the subscript, and it tells you how many of each atom are in the molecule. Make sense?

Now we look to the other side of the equation.

Here we see our products are  

C

O

2

+  

H

2

O

Again, we break these down into individual atoms again.

We have:

1 C atom, 2 H atom, 3 O atom

Answer:

See explanation

Explanation:

A unimolecular reaction is an elementary reaction in which the rearrangement of a single molecule produces one or more molecules of product(Chem Purdue).

A bimolecular reaction refers to the chemical combination of two molecular entities in a reaction that can be considered either reversible or irreversible(Springer).

Elementary reaction refers to any reaction that takes place in a single reactive encounter.

Overall reaction is the sum of all the steps of a non-elementary reaction.

Answer:

From the Online Catalog to the Shelf

Libraries in the United States generally use either the Library of Congress Classification System (LC) or the Dewey Decimal Classification System to organize their books. Most academic libraries use LC, and most public libraries and K-12 school libraries use Dewey.

Explanation:

Answer:

From the Online Catalog to the Shelf

Libraries in the United States generally use either the Library of Congress Classification System (LC) or the Dewey Decimal Classification System to organize their books. Most academic libraries use LC, and most public libraries and K-12 school libraries use Dewey.

Answer:

KCl is cost effective

Explanation:

In order to know this, we need to see how much it cost 1 g of each reactant. Let's begin with HCl

HCl:

In this case, let's calculate the moles of HCl in a 0.130 M solution and then, the mass of HCl using the molecular weight of 36.5 g/mol, to get the cost the HCl at the end using the given price:

nHCl = 0.130 moles/L * 0.5 L = 0.065 moles

mHCl = 0.065 moles * 36.5 g/mol = 2.3725 g

Cost HCl = 39.95 $ / 2.3725 g = 16.84 $/g

Conclusion, 1 g of HCl costs 16.84 $

KCl:

In this case, it's pretty obvious that 1 ton of KCl cost 10$, so, there is no need to do further calculations because 1 ton (or more than 1000 kg of the salt) it's just 10$. This is less expensive than the 16.84$ for just 1 g of HCl, so, final conclusion, KCl is more cost-effective.

Hope this helps

Answer: CH3COO)2Mg + H2SO4 = MgSO4 + CH3COOH

Explanation:

Hope. This helps

Answer:65.4 meters= 65400 millimeters

Answer:

I think you would have to multiply 6 times 2, which it equals 12. And then just divide it by 300, and that's your answer. Hope I was able to help!

Explanation: Have a good day!

Answer:

Simple cubic

Explanation:

The density of metal A (ρa) = 6.17 g/cm³, The density of metal B (ρb) = 8 g/cm³, The atomic weight of metal A (Aa) = 171.3 g/mol, The atomic weight of metal B (Ab) = 162 g/mol, the unit cell edge length (a) = 0.332 nm, concentration of metal A (Ca) = 25%, concentration of metal B (Cb) = 75%

The average density is given by:

[tex]\rho_{ave}=\frac{100}{\frac{C_a}{\rho_a} +\frac{C_b}{\rho_b} } \\\\\rho_{ave}=\frac{100}{\frac{25}{6.17} +\frac{75}{8} } =7.45\ g/cm^3\\\\The\ average\ atomic\ weight\ is:\\\\A_{ave}=\frac{100}{\frac{C_a}{A_a} +\frac{C_b}{A_b} } \\\\A_{ave}=\frac{100}{\frac{25}{171.3} +\frac{75}{162} } =164.23\ g/mol\\\\The\ number\ of\ atoms\ per\ unit(n)\ is:\\\\n=\frac{\rho_{ave}*a^3*N_A}{A_{ave}} \\\\N_A=Avogadro\ constant=6.02*10^{22} \ mol^{-1},a=0.332\ nm=3.32*10^{-8}cm\\\\Substituting:\\\\[/tex]

[tex]n=\frac{\rho_{ave}*a^3*N_A}{A_{ave}} =\frac{7.45*(3.32*10^{-8})^3*6.02*10^{23}}{164.23} \\\\n=0.999\\[/tex]

n≅1

Since n≅1, the crystal structure for this alloy is simple cubic

Answer: It takes more energy to increase the temperature of water than to increase the temperature of oil.

Explanation:

yes

Answer:

sodium metal take part when exposed to air

Answer:

Element

Explanation:

Answer:

Silver oxide is a chemical compound

Explanation:

Silver oxide is the chemical compound with the formula Ag2O.

Answer: [tex]Ca(OH)_2(s)+2HCl(aq)\rightarrow CaCl_2(aq)+2H_2O(l)[/tex]

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.  

The balanced chemical equation is:

[tex]Ca(OH)_2(s)+2HCl(aq)\rightarrow CaCl_2(aq)+2H_2O(l)[/tex]

Answer:

The one left in the hot sunlight.

Explanation:

The solubility of gases decreases when temperature increases. The gas in the soda pop (CO2) left in the sun will not stay dissolved as much as the on left in the refrigerator.

Soda is a carbonated drink with soda or water and a sweetener. Soda pop in the fridge will have more fizzing and bubbles.

Carbonated drinks are drinks or beverages that contain dissolved carbon dioxide. They have small bubbles and fizz of the carbon dioxide present in them.

Carbonation of the drinks is linked to the temperature as at high temperature, liquid tends to lose the carbon dioxide fizz. The carbon dioxide bubbles are retained at low temperatures as the solubility of the carbon dioxide is increased.

Therefore, the bottle kept in the refrigerator will have more bubbles and fizz.

Learn more about soda and carbonated here:

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Answer:

1 mole FeCr2/ 1 mole FeCr2O4

Explanation:

We have to write down the equation of the reaction before we can answer the question;

2C(s) + FeCr2O4(s) -------> FeCr2(s) + 2CO2(g)

By inspection of this reaction equation, we can clearly see that the mole ratio of the reactants and products is 2:1:1:2.

Specifically, the ratio of chromites to ferrochrome is 1:1

Hence;

The mole ration required to convert chromites to ferrochrome is;

1 mole FeCr2/ 1 mole FeCr2O4

Abu Ali al-Hasa invented the words  hypothesis and theory. option A is correct.

The hypothesis is a concept in which the experiment is to be performed for which the research is going to be done and the conclusion or the results of that experiment tell about the some things from which scientists make some hypothesis which are not confirmed information.

The theory of any experiment is about the conformation of that particular research by which the further studies is to be held for further researches these two words given by  Abu Ali al-Hasa.

Therefore, Abu Ali al-Hasa invented the words  hypothesis and theory. option A is correct.

Learn more about hypothesis and theory, here:

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Answer:

2 3 3 2

Explanation:

The bonds between the atoms of an item or substance store elastic energy. When these bonds are under stress, they absorb energy and release it when they are relaxed.

Elastic energy is the mechanical potential energy held in a material's or a physical system's configuration while it is subjected to elastic deformation as a result of work being done on it.

Elastic energy is created when things are momentarily crushed, stretched, or otherwise distorted. Calculations of mechanical equilibrium locations using the elastic potential energy equation.

The energy is potential because when the item is permitted to return to its original shape by its elasticity, it will change into other types of energy, such as kinetic energy and sound energy.

Thus, The bonds between the atoms of an item or substance store elastic energy.

To learn more about elastic energy, follow the link;

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