An elemen belongs to group 17 of the periodic table. This element is most likely a.

Answer:

False

Explanation:

Because laws and theories are developed for different purposes, laws never become theories, and theories do not become laws.

The cofficient of the [tex]\rm H_2S,HNO_3,NO,H_2O,S[/tex] willl be 3,2,2,4 and 3 respectively.

One or more compounds, known as reactants, are transformed into one or more distinct substances, known as products. Such a process is known as a chemical reaction.

The overall reaction is found as;

[tex]\rm H_2S +HNO_3 \rightarrow S+NO+H_2O[/tex]

Reduction reaction;

[tex]\rm N^{+5} + 3e^{-1} \rightarrow N^{+2}[/tex]

The oxidation half-reaction from the overall reaction is;

[tex]\rm S^{-2} = S+ 2e^{-1}[/tex]

Multiply the oxidation reaction by 2 and the reduction reaction by 3 and add them.

[tex]\rm 2 N^{+5}+6e^{-1}+3S^{-2} \rightarrow 2N^{+2}+3S+H_2O \\\\ 2N^{+5}+3 S^{-2}\rightarrow 2N^{+2}+3S \\\\ 3H_2S +2HNO_3 \rightarrow 3 S + 2NO + 4H_2O[/tex]

The cofficient of the [tex]\rm H_2S,HNO_3,NO,H_2O,S[/tex] willl be 3,2,2,4 and 3 respectively.

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Methane was unusually high is the correct option. Hence, option B is correct.

Methane is the simplest member of the paraffin series of hydrocarbons and is among the most potent greenhouse gases. Its chemical formula is [tex]CH_4[/tex].

As the ice compacts over some time, tiny bubbles of the atmosphere or surroundings including greenhouse gases like carbon dioxide and methane—press inside the ice. These air pocket “fossils” give samples of what the atmosphere was kind when that layer of ice formed.

Based upon past studies and insights from current GHG levels, we assume that atmospheric levels of carbon dioxide and methane were unusually low.

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Answer:

A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process.

Explanation:

Answer:

Catalyst

Explanation:

The Final Pressure of the gas is 6 kPa

At constant Temperature , the absolute pressure exerted by the gas is inversely proportional to the volume of the gas.

[tex]\rm P_1V_1 = P_2V_2[/tex]

It is given that

[tex]\rm P_1 = 300k.Pa\\T_1 = 25 \; Degree\\V_1 = 2L\\V_2 = 100L\\T_2 = 25 Degree\\P_2 = ?[/tex]

To determine Final Pressure , Boyle's Law will be applied

300 * 2 = P₂ * 100

P₂ = 300 * 2 / 100

P₂ =6 kPa

Therefore the Final Pressure of the gas is 6 kPa.

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Taking into account the reaction stoichiometry, 8 moles of Ag can be produced from 8 moles of AgNO₃ and 5 moles of Zn.

In first place, the balanced reaction is:

2 AgNO₃ + Zn → 2 Ag + Zn(NO₃)₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 1 mole of Zn reacts with 2 moles of AgNO₃, 5 moles of Zn reacts with how many moles of AgNO₃?

[tex]amount of moles of AgNO_{3}= \frac{5 moles of Znx2 moles of AgNO_{3}}{1 mole of Zn}[/tex]

amount of moles of AgNO₃= 10 moles

But 10 moles of AgNO₃ are not available, 8 moles are available. Since you have less moles than you need to react with 5 moles of Zn, AgNO₃ will be the limiting reagent.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 2 moles of AgNO₃ form 2 moles of Ag, 8 moles of AgNO₃ form how many moles of Ag?

[tex]amount of moles of Ag=\frac{8 moles of AgNO_{3}x2 moles of Ag }{2 moles of AgNO_{3}}[/tex]

amount of moles of Ag= 8 moles

Then, 8 moles of Ag can be produced from 8 moles of AgNO₃ and 5 moles of Zn.

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Answer:

electromagnetic waves and mechanical waves

Explanation:

I think these two kinds of waves can transmit energy through a vaccume.

Hope I helped!

Electromagnetic waves.

Gravity waves.

Answer:

A rule of thumb is that 1.5 lbs. of baking soda per 10,000 gallons of water will raise alkalinity by about 10 ppm. If your pool's pH is tested below 7.2, add 3-4 pounds of baking soda. If you're new to adding pool chemicals, start by adding only one-half or three-fourths of the recommended amount.

Answer:

Option A, 66.5

Explanation:

use q (heat) = m(mass) * cp(specific heat) * deltat (change in temp)

q= 1172, m = 45.8, cp = 0.385

1172= (45.8) * (0.385) * Delta T

1172= 17.633 *DeltaT

1172/17.633 =DeltaT

66.5 =DeltaT

Various samples of the must be combusted in other to obtain a reliable result.

The bomb calorimeter is used to obtain the energy of a sample. This is called the energy equivalent or the energy value of the sample.

Now, we know that the bomb calorimeter is calibrated by the use of benzoic acid hence it must be combusted first to obtain the basic energy value of the calorimeter.

Various samples of the must be combusted in other to obtain a reliable result.

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Answer:

V₂ = 4.80 L

Explanation:

Because you are dealing solely with pressure and volume, you can find the new volume using the Boyle's Law equation. The general equation looks like this:

P₁V₁ = P₂V₂

In this form, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the new pressure and volume. You have been given all of the variables but V₂. Therefore, by plugging these values into the equation, you can simplify to find your answer.

P₁ = 602 torr              V₁ = 24.0 L

P₂ = 3010 torr            V₂ = ?

P₁V₁ = P₂V₂                                               <---- Boyle's Law equation

(602 torr)(24.0L) = (3010 torr)V₂             <---- Plug variables into equation

144448 = (3010 torr)V₂                            <---- Multiply 602 and 24.0

4.80 = V₂                                                 <---- Divide both sides by 3010

9-fluorenone is a limiting reagent and theoretical yield.

Fluoren-9-ol is a member of the class of hydroxyfluorenes that is 9H-fluorene substituted by a hydroxy group at position 9.

Inspect stoichiometry of the given reaction as per the balanced equation below:

[tex]4C_{13}H_8O + NaBH_4 + 4CH_3 OH[/tex] → [tex]4C _{13} H _{10} O + NaB(OCH_3 )_4[/tex]

Given weight:

0.6 grams methanol

0.05 grams 9-fluorenol

0.792 [tex]NaBH_4[/tex]

Out of the three reactants, [tex]NaBH_4[/tex] acts as a reducing agent only and hence the reaction can occur only when [tex]NaBH_4[/tex] is present in relatively much smaller amounts. But the yield of the product,9-fluorenol, is not governed by its quantity.

Theoretically, when equimolar amounts of reactants ( 9-fluorenone and methanol ) are taken for reaction in presence of [tex]NaBH_4[/tex] an equivalent quantity of product, 9- fluorine is obtained, as inspected in the above stoichiometric relations. But practically we have used a lesser number of moles of 9-fluorenone than theoretically needed, hence in this case it should serve as the limiting reagent.

9- fluorenone, methanol & [tex]NaBH_4[/tex] are the reactants, while the product 9-fluorenol would be obtained = 0.0033 moles

This would represent the theoretical yield of the product 9-fluorenone, as we have used an excess of methanol thus facilitating the reaction to go to completion.

Hence, 9-fluorenone is a limiting reagent.

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The main function of using a virtual spectrometer in order to analyze astronomical bodies in space is to find the chemical composition of planets and stars.

This refers to the instrument that is used to observe the color separation of light in a controlled experiment.

Hence, we can see that another reason for the use of a virtual spectrometer to make an analysis of astronomical bodies is to indicate the speed and direction of a star or galaxy as it spreads incoming beams of light into different spectrums.

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Answer: 0.118M

Explanation:

The formula for molarity is: [tex]M=\frac{mol solute}{L solution}[/tex]

First, we need to find the number of moles of NaCl.

[tex]2.70gNaCl*\frac{1molNaCl}{58.44gNaCl} =0.05molNaCl[/tex]

Next, we must convert millimeters to liters. We can do that by dividing the number of mL by 1000.

[tex]\frac{425mL}{1000} =0.425L[/tex]

Now we have our needed data! All we need to do now is plug in our data to the molarity formula.

[tex]M=\frac{0.05mol}{0.425L} =0.118M[/tex]

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The most likely reason why the potato chunks gained mass is that water entered the potato cells.

The process of Osmosis allows water to pass through the semi-permeable membrane of potato cells.

This happens when the potato cells have less water than the material around them which then leads to water entering the cells to balance the water concentration.

The potato cells will expand and have more mass as a result.

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Answer:

3

Explanation

it is 3

Explanation:

a) Both A and R are true and R is the correct

explanation of A.

Answer:

[tex]\fbox {c) A is true but R is false.}[/tex]

Explanation:

Assertion (A):

⇒ Naphthalene balls disappear with time without leaving any solid.

⇒ True √

Reason (R):

⇒ Solid converted to liquid is called sublimation.

⇒ False ×

⇒ Solid converted to liquid is called melting

Answer:

0.0496

Explanation:

Well, there’s none!!! It’s just so easy…

Answer: 49.6

Explanation: It actually wants the answer it mL not L.

Answer: C. A substance that results when two or more substances combine physically but not chemically

When an element is placed into a solution with lesser reaction, the reaction rate will be slow.

The rate of a reaction is the rate which reactants molecules are converted or the products molecules are formed.

The rate of a reaction increases with increase in concentration of the reactants and decreases with decrease in concentration.

Therefore, when an element such as a metal is placed in solution of low concentration such as very dilute acid, the reaction rate will be slow.

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Answer:

1.42 M

Explanation:

First calculate the amount of moles.

that's done by dividing the mass with the molecular mass so 660g / 310.18 g/mol = 2.13 mol

Then you can calculate the molarity by dividing the moles with the volume so 2.13 mol / 1.5 l = 1.42 M

(without rounding: 1.418531175 M)

Answer:

1.42 M

Explanation:

Acellus

Answer:A is correct

Explanation:

Taking into account the definition of dilution, the molarity of the unknown solution is 0.133 M.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

Ci× 10.5 mL= 0.172 M× 80 mL

Solving:

Ci= (0.172 M× 80 mL)÷ 10.5 M

Ci= 0.133 M

In summary, the molarity of the unknown solution is 0.133 M.

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Answer:

25.55 g

Explanation:

To find the total mass of both objects, you need to add the masses together.

22.45 g + 3.1 g = 25.55 g

In correct significant figures (2 sig figs to match 3.1 g), the value would be 26 g.

Answer:

answer = 25.55

Explanation:

You just have to add the mass of the two objects

Answer: bromine

Explanation:

There are a total of 2+2+6+2+6+2+10+5=35 electrons, meaning there are 35 protons. The element with atomic number 35 is bromine

The moderately reactive atoms located in the periodic table are fluorine, chlorine, bromine, and iodine which means the halogens family.

The number of balance electrons of the light metals compared to those heavier by listing elements in the order of increasing atomic number.

They are the five non-metals in family 7A of the periodic table. Halogens are chemical elements that form inorganic salts. In the periodic table they are part of group 17 or family 7A.

Halogens are strong oxidants and react mainly with alkali metals (Family I A) which tend to donate an electron. They also react with metals and noble gases (Family VIII A).

The chemical elements are arranged from left to right and top to bottom in order of increasing atomic number, or the number of protons in an atom's nucleus, which generally coincides with increasing atomic mass.

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What are halogen metals?

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0.227L is the volume of a 3.95 M potassium chloride solution that would be needed to make 325 mL of a 2.76 M solution by dilution.

A mole is defined as 6.02214076 × 10^{23} of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Moles of KCl in new solution

0.325dm³ x (2.76mol/dm³)

= 0.897mol.

Hence volume needed

0.897mol ÷(3.95mol/dm³)

= 0.227dm³ or 0.227L.

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