PLEASE HELP NEEDED URGENTLY !! NO FAKE ANSWERS PLEASE. ONLY CORRECT ANSWERS . NEED IT DONE BY SUNDAY

The rate of effusion of a gas is inversely proportional to its molar mass.

Therefore, the gas with the molar mass closest to that of nitrogen (14 g/mol) will have the most similar rate of effusion to nitrogen at 350 K.

The gas with the molar mass closest to that of nitrogen is hydrogen (1 g/mol). Therefore, the gas with the most similar rate of effusion to nitrogen at 350 K is hydrogen (H2). The other gases (CH4, CO, CO2, and Ne)

all have molar masses significantly higher than nitrogen, and therefore they will have slower rates of effusion than nitrogen at 350 K.

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CL2 is the oxidizing agent and Ba is the reducing agent for :

                                        ba (s) cl2 (g) --> bacl2 (s)

Oxidation agents are those which oxidize another substance by taking up their electrons. The other substance gets oxidized and loses electrons. The oxidation agents themselves go through reduction.

The tendency of oxidizing agents to accept electrons is due to their high oxidation states. Halogen is an example of an oxidizing agent.

Reducing agents on the other hand reduces the other substance by giving them electrons. they themselves go through oxidation. Hydrogen is an example of a reducing agent.

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Answer:

letter b

Explanation:

I dunno if I'm right cuz I'm just a grade five sorry if this can't help

When one component of a circuit in series stops, the entire circuit also comes to an end.

A series circuit will be disrupted and no longer allow electricity to flow if one component is taken out or disconnected. Take a series circuit made up of a number of Christmas tree lights as an illustration. The power cannot pass through to the next bulb if one of the bulbs breaks.All components in a parallel circuit connect to the same electrical nodes. Since all parallel components share the same voltage, the overall current is equal to the sum of all the branch currents.

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The variable that is unknown until the experiment is performed is the dependent variable.

In a scientific experiment, variables are classified into two main categories: independent variables and dependent variables. The independent variable is the variable that is intentionally manipulated or changed by the experimenter. It is under the control of the experimenter and is deliberately altered to observe its effect on the dependent variable.

On the other hand, the dependent variable is the variable that is measured or observed as the outcome or response in the experiment. It is the variable that is expected to change in response to the manipulation of the independent variable. The value or behavior of the dependent variable depends on the value or behavior of the independent variable.

Typically, before conducting an experiment, researchers have a hypothesis or an expectation about how the independent variable will affect the dependent variable. However, the actual outcome or result of the experiment, which is observed through the measurement of the dependent variable, remains unknown until the experiment is performed.

The purpose of conducting the experiment is to gather empirical data and observe the changes in the dependent variable to analyze the relationship between the independent and dependent variables.

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H3O+ is overexposed before the equivalency point. By deducting the amount of additional OH- from the amount of starting H3O+ then dividing by the total volume, you may determine the [H3O+].

The capacity of an object is expressed in terms of volume. A cup's capacity is described as 100 ml, for instance, if it can hold 100ml in its brim. The quantity of space a three-dimensional item takes up can also be referred to as volume.

A three-dimensional object's volume, which is expressed in cubic units, is the amount of space it takes up. The cubic units cm3 and in3 are two examples. On the other hand, mass is a measurement of the amount of matter in an item. How much an object weighs is frequently used to determine mass.

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A chemical reaction can be reversed if the energy of the products exceeds the activation energy threshold.

A chemical reaction is a process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.

A chemical reaction requires an energy called activation energy to occur. This energy is the energy needed to be surpassed before a chemical reaction can occur.

However, the reaction can be reversed if the energy of the products exceeds the activation energy threshold.

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Answer:

Give them each one so all of you is 8

Explanation:

I hope it helps:)

Fred and Florence have a combined total of 14 markers. Meaning, the amount of markers between all three is 24. If Maggie gives one marker to Fred and one marker to Florence, then each of them will have 8 markers.

Explanation:

The density of substance is the ratio of mass to volume.

For solids it is maximum ans decreases from solid to liquid to gases.The ratio decreases as the distance between the molecules increases and hence volume increases consequently density decreases. Inter molecular distance is maximum to minimum from solid to gases.

Answer:

Explanation:

D. i had this on my science test!!!

Answer:

D

Explanation:

yup its D

Answer:  

Argon (Ar)  

Explanation:  

Chlorine has an atomic number of 17. That means that it has 17 protons and 17 electrons, thus being electrically neutral. When it gains 1 electron to form the chloride ion, the total number of electrons is 17 + 1 = 18.

Argon is a noble gas with an atomic number of 18, which means it has 18 electrons.

Answer:

Oceans, Fossil fuels, atmosphere

Answer:

The word that best characterizes the Pardoner in this passage is hypocritical.

Explanation:

The Pardoner is against avarice, but as it turns out, he himself commits this sin.

The energy of the photon is 4 * 10^-19 J.

We have to note that the energy of the photon can be obtained by the application of the formula that connects the wavelength to the energy.

We have to note that;

E = hc/λ

E = energy of the photon

h = Plank's constant

c = speed of light

λ = Wavelength

We then have that;

E = 6.6 * 10^-34 * 3 * 10^8/488 * 10^-9

E = 4 * 10^-19 J

From the calculation, we have the energy of the photon as 4 * 10^-19 J here.

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The equilibrium concentrations for all species in the solution are as follows: [HA] = 0.114 M, [A-] = 0.006 M, and [H+] = 0.006 M.

Let's assume the initial concentration of the weak acid HA is 0.120 M.

Given that the acid is 5.00% ionized, it means that 5.00% of HA has dissociated into its conjugate base A- and H+ ions. Therefore, the concentration of A- is 5.00% of the initial concentration of HA, which is (0.120 M * 5.00%) = 0.006 M.

The remaining portion of HA that has not ionized is given by the initial concentration of HA minus the concentration of A-, which is (0.120 M - 0.006 M) = 0.114 M.

Since the acid is monoprotic, the concentration of H+ is equal to the concentration of A-, which is 0.006 M.

To calculate the pH, we use the formula pH = -log[H+]. Therefore, pH = -log(0.006).

To calculate the Ka (acid dissociation constant), we use the formula Ka = [H+][A-] / [HA]. Plugging in the known values, Ka = (0.006 * 0.006) / 0.114.

The equilibrium concentrations for all species in the solution are as follows: [HA] = 0.114 M, [A-] = 0.006 M, and [H+] = 0.006 M. The pH can be calculated using the equation pH = -log(0.006). The Ka (acid dissociation constant) can be calculated using the equation Ka = (0.006 * 0.006) / 0.114.

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The expected absorbance of a standard solution made by dissolving 0.0070 mol of NiCl2 · 6H2O in water to make 100 ml of solution is 0.227.

Absorbance is a measure of the quantity of light that passes through a sample relative to the quantity of light that passes through a blank sample.

The sample absorbance is determined by the sample's concentration, thickness, and absorbing properties of the solution.

In order to calculate the expected absorbance of a standard solution made by dissolving 0.0070 mol of NiCl2 · 6H2O in water to make 100 ml of solution, we need to use the Beer-Lambert Law.

It states that the absorbance of a solution is directly proportional to the concentration of the solution and the length of the path that the light has to travel through the solution.

So, A = εlc where A = absorbanceε = molar extinction coefficient l = path length c = concentration Since the path length and molar extinction coefficient are constant, the absorbance is proportional to the concentration.

So, A1/A2 = C1/C2

Where, A1 = absorbance of the standard solutionC1 = concentration of the standard solution

A2 = absorbance of the unknown solutionC2 = concentration of the unknown solution Rearranging the formula we get, C2 = C1(A2/A1)

Given that the concentration of the standard solution is 0.0070 mol/L and the path length is 1 cm.

The molar extinction coefficient for NiCl2·6H2O is 4.76 × 10^3 L/mol·cm. Substituting these values in the formula we get, C2 = 0.0070 mol/L × (0.380/1.660) = 0.0016 mol/L

Again, using the Beer-Lambert law we can find the expected absorbance of the unknown solution, where A = εlc.A = 4.76 × 10^3 L/mol·cm × 1 cm × 0.0016 mol/L = 7.62.

The expected absorbance of a standard solution made by dissolving 0.0070 mol of NiCl2 · 6H2O in water to make 100 ml of solution is 0.227.

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Answer:

They will move at the same speed

Explanation:

This will depend on the heat of the water. The hotter the water is the more the molecules move around. As the water cools it will make the molecules move slower.

Hope this helps! :)

Answer: 3 oxygen atoms!

Explanation: Let me know if I'm wrong, if not I'm happy to help!

Answer:

The middle hydrogen is bonded to 2

elements.

Each hydrogen must be bonded to one element which is oxygen

Answer:

A, C, and D

Explanation:

a. NH3 (Ammonia): In a 1.0L container of NH3 at Standard Temperature and Pressure (STP), intermolecular forces such as hydrogen bonding would be exerted.

b) 1.0L container of CHCl3 at STP, dipole-dipole interactions (along with London dispersion forces) would be present.

a. NH3 (Ammonia):

In a 1.0L container of NH3 at Standard Temperature and Pressure (STP), intermolecular forces such as hydrogen bonding would be exerted. Ammonia (NH3) molecules consist of one nitrogen atom bonded to three hydrogen atoms, forming a trigonal pyramidal shape.

Hydrogen bonding is a type of intermolecular force that occurs when a hydrogen atom is covalently bonded to an electronegative atom (in this case, nitrogen) and interacts with another electronegative atom (in this case, the nitrogen atom of a neighboring NH3 molecule).

b. CHCl3 (Chloroform):

In a 1.0L container of CHCl3 (chloroform) at STP, intermolecular forces such as dipole-dipole interactions would be exerted. Chloroform (CHCl3) molecules consist of one carbon atom bonded to three hydrogen atoms and one chlorine atom, forming a tetrahedral shape.

Dipole-dipole interactions arise due to the difference in electronegativity between chlorine and hydrogen atoms. The chlorine atom is more electronegative than hydrogen, resulting in a polar covalent bond.

While dipole-dipole interactions are present in CHCl3, it is worth noting that CHCl3 also exhibits London dispersion forces. These forces occur due to temporary fluctuations in electron distribution, creating temporary dipoles.

London dispersion forces are the weakest type of intermolecular force but still contribute to the overall intermolecular interactions in CHCl3.

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9.0L is  the volume of oxygen, measured at r.t.p., which is formed when 1.60 g of CuO reacts as shown in the equation.

A measurement of three-dimensional space is volume. It is frequently expressed quantitatively using SI-derived units, like as the kilogramme, metre or litre, or different imperial or US-standard units, including the gallon, quart and cubic inch. The link between volume with length (cubed) is symbiotic. The volume much a container is often thought of as its capacity, not as the amount of space it takes up. The amount of fluid (liquid and gas) which the container can hold is defined as its volume, in other words.

4CuO →2Cu\(_2\)O + O\(_2\)

moles of CuO = 1.60 / 79.54

                        = 0.020

According to stoichiometry,

moles of oxygen = 0.020/4= 0.004

P×V = n×R×T    

1×V = 0.004×8.314×273

V= 9.0L

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The question requires us to calculate the amount of vapor water produced as a by-product when 66g of carbon dioxide are obtained from the combustion of propane.

Considering the combustion of propane (C3H8), we have the following reaction:

IFrom the reaction, we can see that the stoichiometric relationship between C3H8 and water (H2O) is as follows:

2 mol C3H8 ---------- 8 mol H2O

Then, to calculate the amount of water produced as a by-product, we'll need to determine the amount of reactant needed to produce 66g of CO2.

Since the molar mass of CO2 is 44g/mol and considering the reaction written above, we can write:

2 mol C3H8 ---------- 4 mol CO2

x ---------- (66g/44g) = 1.5 mol CO2

Solving for x, we have that 0.75 mol of C3H8 are required to produce 66g of CO2.

Now, we calculate the amount of water that should be obtained from 0.75 mol of C3H8:

2 mol C3H8 ---------- 8 mol H2O

0.75 mol C3H8 ----- y

Solving for y, we have that 3 moles of water will be obtained as a by-product.

At last, we convert the calculated amount of vapor water into its volume considering the Standard Temperature and Pressure conditions (STP), where 1 mol of a gas corresponds to 22.4 L of the same gas:

1 mol vapor H2O ---------- 22.4 L vapor H2O

3 mol vapor H2O --------- z

Solving for z, we have that 67.2 L of vapor water will be obtained as a by-product when 66g of CO2 are produced from the combustion of propane.

Answer:

Required Volume is 22.47ml

Explanation:

To make 2.0L of 0.2M sulfuric acid required moles = 0.2 x 2 = 0.4 moles

To get 0.4 from 17.8M required quantity = 1000/17.8 x 0.4 = 22.47ml

The nucleus of the gold atom has a total charge of 1.26 x 10⁻¹⁷ C.

An atom has a nucleus at the center in which subatomic particles like protons and neutrons are present. The electrons revolve around this nucleus in discrete shells.

Neutrons have no charge on them and hence are neutral while protons are positively charged. Therefore the total charge on the nucleus is solely because of the presence of the protons in it.

In terms of magnitude, one proton has +1.6 × 10⁻¹⁹ C charge on it. Here 'C' stands for coulomb which is the unit of measuring charge.

The atomic number or the total number of protons inside the nucleus of the gold atom is 79.

Therefore, \(\rm Total\ charge\ =\ atomic\ number\times charge\ on\ each\ proton\)

                                        \(\rm = 79\times (1.6\times10^{-19} )\)

                                        \(\rm = 1.26\times10^{-17}\ C\)

So, the nucleus of the gold atom has a total charge of 1.26 x 10⁻¹⁷ C.

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Answer:

I think its the 3rd one

Explanation:

Answer:

94 moles of Carbon

Explanation:

From the question,

Using Avogadro's constant

1  mole of every element contains 6.03×10²³ atoms of the element

If 1 mole of Carbon contains 6.03×10²³ atoms of Carbon,

Then, x mole of Carbon will contain 5.67×10²⁵ atoms of Carbon

1 mole of C ⇒ 6.03×10²³ atoms of C

x mole of C ⇒ 5.67×10²⁵ atoms of C

solve for x

x = (1× 5.67×10²⁵)/6.03×10²³

x = 94.03 moles of Carbon

x ≈ 94 moles of Carbon

The value of the seventh half-life for this reaction is 1134 seconds.

A first-order reaction is a type of reaction where the rate of reaction is directly proportional to the concentration of the reactant. The half-life of a reaction is the time it takes for half of the reactant to be consumed.

Given that the first half-life of the reaction is 162 seconds, we can use this information to calculate the value of the seventh half-life.

To do this, we can use the formula for the half-life of a first-order reaction:

t1/2 = (0.693 / k)

where t1/2 is the half-life and k is the rate constant of the reaction.

By rearranging the formula, we can solve for the rate constant:

k = 0.693 / t1/2

Now, we can use the rate constant to find the seventh half-life. Since each half-life is the same duration, we can multiply the first half-life by 7 to get the seventh half-life:

seventh_half_life = 7 * 162 seconds

Calculating this gives us:

seventh_half_life = 1134 seconds

Therefore, the value of the seventh half-life for this reaction is 1134 seconds.

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Answer:

CuO + H2SO4 = CuSO4 + H2O  

Reaction type: double replacement