19) A sample of metal ore is reacted according to the following reaction:Fe(s) +2HCL (aq) --> FeCl2(aq) + H2(g)If 24.06 mL of 5.6 M HCL are used, what mass of Fe was in the ore? Keep the answer with 2 decimal places

Answer:

Explanation:

Here, we want to get the number of moles of sulfur dioxide needed to form 2.31 moles of sulfur trioxide

The first thing we would be needing here is to write the equation of the reaction

We have that as:

From the equation of reaction, the number of moles are in the same ratio

1 mole of sulfur dioxide formed 1 mole of sulfur trioxide

That means:

2.31 moles of sulfur trioxide was formed from 2.31 moles of sulfur dioxide

The balanced equation is:

According to this, 3 moles of H2 produce 2 moles of NH3, use this ratio to find how many moles produce 9 moles of NH3:

It means that 13.5 moles of H2 are needed to produce 9 moles of NH3.

A balloon of 21cm diameter can hold 8.57×10²³ atoms of He.

We know,

Mass of He = density × volume

= 1.8 × 4/3πr³

r = 21/2

volume = 4/3π(21/2)³

As 1cm³ = 10⁻³l

So, Volume = 4/3π(21/2)³ × 10⁻³ l

Mass = {1.18 × 4/3 × 3.14 × (21/2)³ × 10⁻³}g

Mass = 5.71g

Number of atoms = (mole × Avogadro's number)

= (5.7/4 × 6.02×10²³)

= 8.57×10²³ atoms

Therefore a balloon of 21cm diameter can hold 8.57×10²³ He atoms.

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- First, to calculate the % concentration of glucose in the solution, we need to add the 8.5g of glucose to the 35 g of water, to get the weight of the solution:

- Second, we calculate the %w/w (weight/weight) with the solute weight and the solution weight:

- So,

Answer: structure B corresponds to the compound 3,4,4-trimethyl-2-pentanone

Explanation:

The question requires us to choose the structure that corresponds to the compound 3,4,4-trimethyl-2-pentanone.

The compound 3,4,4-trimethyl-2-pentanone presents a main chain of 5 carbons (indicated by the prefix pent-), with a ketone group bonded to the second carbon in the chain (indicated by the number 2 and the suffix -one). Also, there are 3 methyl groups: the first one is bonded to the third carbon in the main chain, while the other two methyl groups are bonded to the fourth carbon.

We can draw the structure of 3,4,4-trimethyl-2-pentanone as it follows:

(Note that the number of each carbon from the main chain is shown in blue near the C symbol)

Now, let's compare the structure drawn above to the structures provided by the question:

Even though structure A presents a ketone group bonded to the second carbon, the methyl groups are not positioned in the right place. Also, there is only 2 methyl groups bonded to the main chain at the 4th carbon of the chain.

Structure B presents the ketone bonded to the 2nd carbon from the main chain, a methyl group at the 3rd carbon and two methyl groups at the 4th carbon.

Therefore, structure B corresponds to the compound 3,4,4-trimethyl-2-pentanone.

ANSWER

The volume of Argon gas is 5.60L

STEP-BY-STEP EXPLANATION:

Given information:

The number of atoms of argon = 1.5 x 10^23 atoms

To find the volume of Argon, we need to find the number of moles of argon, then, we assume the number of moles of argon to be x

To find the number of moles, we will need to apply the below formula

Recall that, Avogadro's number = 6.022 x 10^23

Since x represents the number of moles of argon gas, then, the mole of argon gas is 0.2498 mole.

The next step is to find the volume of Argon in liters

Recall that, at S.T.P, 1 mole is equivalent to 22.4L

Let x represent the volume in liters of argon

Then, this can be solved mathematically below

Therefore, the volume of Argon gas is 5.60L

Average reaction rate is 0.02 mol/liter/sec

Change in concentration divided by the change in time gives average reaction rate. The rate of a chemical reaction is measured in mol/l/s.

Average rate is defined as the change in molar concentration of either reactants or products in time is called as average rate. The concentration of reactants decreases during reaction, whereas the concentration of products keeps on increasing until an equilibrium is reached.

Evaluating an average rate shows the amount of change of one variable with respect to another. The other variable is generally time that describes the average change in distance or chemical concentrations.

For the given reaction

CO(g) + NO₂(g) → CO₂(g) + NO(g), a CO₂

concentration of 0.040

moles/liter was measured at 2 seconds.

Average reaction rate = concentration/ time

0.040/ 2

=0.02 mol/l/sec

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The missing component in the nuclear equation [tex]\frac{209}{84} Po\\[/tex] → [tex]\frac{205}{82}Pb[/tex] + X is predicted to be [tex]\frac{4}{2} He[/tex].

This nuclear reaction is form of an alpha decay process. In this alpha decay process, the nucleus gets decayed through the release of an alpha particle. The mass number of the nucleus is decreased by 4 units and atomic number of the nucleus is also reduced by 2 units. The particle which is released is nucleus of helium.

The general equation which represents the alpha decay process is -

[tex]\frac{A}{Z} X[/tex] → [tex]\frac{A-4}{Z-2} Y[/tex] + [tex]\frac{4}{2} \alpha[/tex]

The nuclear equation is -

[tex]\frac{209}{84}Po[/tex] → [tex]\frac{205}{82} Pb[/tex] + X

We will balance the reaction and we have to remember in balancing the nuclear equation is that the sums of the superscripts and the subscripts has to be the same on both sides of the equation.  

Sum of superscripts : 210 = 206 + y,

                                   so, y =4.  

Sum of subscripts : 84 = 82 + x,

                                    so, x = 2.

Therefore, the nuclear equation is -

[tex]\frac{209}{84} Po[/tex] → [tex]\frac{205}{82} Pb[/tex] + [tex]\frac{4}{2} He[/tex]

Hence, the missing component is [tex]\frac{4}{2} He[/tex].

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The energy of an orange lamp with a frequency of 5.10 x 10¹⁴ Hz is 3.38 x 10⁻¹⁹ J.

Frequency is defined as the number occurrences of repeated events per unit of time. SI unit is hertz (Hz).

Using the formula,

E = hν

where,

E = energy in joules (J)

h = Planck's constant =  6.63 x 10⁻³⁴ J

ν = frequency in hertz

Given :

Frequency = 5.10 x 10¹⁴ Hz

h = 6.63 x 10⁻³⁴ J

Putting the values,

E = (6.63 x 10⁻³⁴) x (5.10 x 10¹⁴) J

E = 3.38 x 10⁻¹⁹ J

The energy of an orange lamp with a frequency of 5.10 x 10¹⁴ is  3.38 x 10⁻¹⁹J.

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The complete question is -

What is the energy of an orange lamp with a frequency of 5.10 x 10¹⁴ Hz ?

The volume of concentrated acid that must be added to obtain a total volume of 50ml is = 0.967ml.

An acid is defined as the substance that is capable of donating it's hydrogen ion as the only positive ion in a chemical reaction.

The concentration of stock solution (M¹) = 6.00M.

The concentration of dilution that is needed (M²) = 0.116M.

The volume of the dilution to be used (V²) = 50.0 ML.

The volume of the stock solution to be used (V¹) = xML.

Using the formula;

M¹V¹= M²V²

Make V¹ = M²V²/M¹

V¹= 0.116 × 50/ 6

V¹= 5.8/6

V¹= 0.967ml

Therefore, the amount of concentrated acid (which is the stock solution) that would be used for dilution= 0.967ml.

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The given concentration, 0.40% (m/v), is a mass volume percent concentration. It indicates us that there are 0.40g of NaCl in every 100mL of solution.

We can use this information to detemine how many grams of NaCl are there in 3.0L (3000mL) of solution:

Now, convert this amount of mass to moles using NaCl molar mass:

It means that the corect answer is 0.20 moles of NaCl.

Reaction - It's understood that H+ doesn't exist on its own in water, and H₃O⁺(aq)⁺Cl⁻(aq) are both aqueous.

What is Reaction?
An act that changes one group of chemical constituents chemically into another is known as a chemical reaction. Chemical reactions typically involve changes that only influence the positions of electrons in the formation and dissolution of chemical bonds between atoms, with no change to the nuclei. Chemical processes are commonly described by a chemical equation (no change to the elements present). The study of chemical processes involving unstable and radioactive elements—where both electronic and nuclear changes may take place—is known as nuclear chemistry.

When Acid HCl react with water it dissociates as H⁺ + Cl⁻ ion. H⁺ is a proton (Hydrogen ion is a proton with the charge on it) but this single unit of the charge is very small as compared to it value of the solution is water and acid. The resulting extraordinary high change desity of the proton strongly atom or molecule in ehich there exist an excess of the
⁻ve charge. In the case of water, the lone pair (e⁻) on oxygen attract the proton and form a co-ordinate bond with it creating a hydronium ion (H₃O⁺)

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Answer:

It's understood that H+ doesn't exist on its own in water, and H30(aq) + Cl(aq) are both aqueous.

Explanation:

took quiz

Answer: C. 1 liter of water vapor

Explanation:

The average kinetic energy increases as follows.

Gas > Liquid > Solid

You can think about it as how fast and freely the molecules are moving in each state, with gases being the greatest.

The theoretical yield of water formed from the reaction of 7.8g of sulfuric acid and 9.5g of sodium hydroxide will be 2.52g.

According to given reaction:-

H₂SO₄(aq) + 2NaOH(s) - Na₂(SO₄) + 2H₂O

7.8g 9.5g 0 0

(7.8÷98)mol (9.5÷70)mol 0 0

(0.07) (0.23)

Here we can see that H₂SO₄ is the limiting compound, so amount of product depends on the amount of H₂SO₄

(mole of H₂SO₄÷coefficient) = (mole of H₂O÷coefficient)

(0.07÷1) = (mole of H₂O÷2)

Therefore,

mole of H₂O= 0.14 mole

Amount in gram= 0.14×molecular weight of H₂O

= 0.14×18

= 2.52g

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So,

First remember that the work done can be found if we remember the following equation:

Where W is the work done, P is the pressure (constant) and ΔV represents the change in the volume. (The substraction between the final volume and the initial volume)

If we replace our values, we got that:

The gas is being expanded, the sign of the work done is positive.

The work done is 280J.

In the situation where a closed glass bottle, a molecule splits into two new molecules, the pressure would increase because there would be more collisions with the walls of the container.

Pressure can be described as the perpendicular force per unit area, or the stress at a point within a confined fluid.

The observations about the behavior of gases above can be explained with a simple theoretical model known as the kinetic molecular theory which is based on the following assumptions:

There are some pressure laws postulated as well to explain the behavioral pattern pf gases and they include:

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The concentration of ascorbic acid is approximately 0.001 M in lemon juice, this is not a significant error.

The chemical reactions which can be shown as a simple exchange of valence electron pairs to break the bonds and to form the bonds. It is an acid-base reaction.

We will calculate the number of moles-

Number of moles = Given mass

                                 Molar mass

Moles = 176.1

               4

Moles = 113 mol

Then, moles is divided by the volume of 9.1 L

Concentration = 113/9.1 = 12.4 M

Here, we take the H⁺ concentration.

Significant Error is defined as an error in an assessment where a compound's clinical status is not accurately represented and the error has not been corrected when submission of a more recent result is done.

In chemistry, Significant figures are those digits of value that carries meanings for the correct result of the measurements. All the measurement of the experiments have some kind of uncertainty which are associated with them.

Therefore, the concentration is not significant error.

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Step 1

The chemical formula of iron (III) sulfate is the next one:

Fe2(SO4)3

As we can see, there are 3 x 1 atom of S, 3 atoms of S

----------------

Step 2

Information needed:

The atomic masses of:

Fe) 55.8 g/mol

S) 32.0 g/mol

O) 16.0 g/mol

(Please, the periodic table is useful here)

----------------

Step 3

The % of S in Fe2(SO4)3 is calculated as follows:

Answer: 24 % of S

We have the balanced equation of the reaction, this is a neutralization reaction.

We have the moles of CO2 generated, equal to 2.72 moles. The number of moles of CaCO3 is found by reviewing the stoichiometric coefficients of equation 2. We have that the ratio CaCO3 to CO2 is 1/1.

Therefore, the moles of CaCO3 will be:

The mass of CaCO3 we will be found by multiplying the moles of CaCO3 by its molar mass. The molar mass of CaCO3 is 100.0869g/mol.

Answer: The mass of CaCO3 needed will be 2.72x10^5 milligrams

Answer: the option that appears in a heating curve (where the heat added is shown) is the change from solid to liquid (letter C)

Explanation:

The question requires us to choose, among the options given, which of the options present parts of a heating curve.

A heating curve presents the relationship between temperature, the state of a substance and the heat added over time.

Considering that the heating curve mentioned by the question only considers the heat gained over time, the possible changes of state are the ones that require heat added to happen. We need to keep in mind that:

- to change from a liquid to a solid, the heat is removed from the substance (temperature decreases);

- to change from a solid to a liquid, the heat is added to the substance (temperature increases);

- to change from a gas to a liquid, the heat is removed from the substance (temperature decreases).

Therefore, the option that appears in a heating curve where the heat added is shown is the change from solid to liquid (letter C).

Answer:

• AgNO3 solution

- Reaction with copper (Cu):

- Reaction with magnesium (Mg):

- Reaction with zinc (Zn):

- Reaction with tin (Sn):

• CuSO4 solution

- Reaction with copper (Cu):

- Reaction with magnesium (Mg):

- Reaction with zinc (Zn):

Explanation:

The given reactions are single replacement reactions, that is, the metal in the strips replaces the metal in the molecule of the solution.

• AgNO3 solution

- Reaction with copper (Cu):

- Reaction with magnesium (Mg):

- Reaction with zinc (Zn):

- Reaction with tin (Sn):

• CuSO4 solution

- Reaction with copper (Cu):

- Reaction with magnesium (Mg):

- Reaction with zinc (Zn):

When a substance or radiation's heat is stated quantitatively, it is called its temperature.

Three different categories of temperature scales exist:

those, like Kelvin's original definition, that solely rely on macroscopic characteristics and thermodynamic concepts;

those that rely on actual, empirical particle qualities as opposed to theoretical concepts;

Additionally, there are scales like the SI scale that are determined by the typical translational kinetic energy per freely moving tiny particle, such as an atom, molecule, or electron in a body.

The equation q = mcΔT, where m is the sample mass, c is the specific heat, and T is the temperature change, can be used to determine how much heat a a sample gains or loses (q).

Therefore,

q = m*c*ΔT

2072.87 = 335 * 4.184 * ΔT

ΔT = 1.479 °c

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According to the pressure law, the pressure (P) of a fixed mass of a gas is directly proportional to its absolute temperature (T) provided that the volume remains constant. Mathematically;

k is the variation constant

If we have initial and final pressure and initial and final temperature, the formula can be written as:

3) The gas law that demonstrates the equation and definition above is known as the PRESSURE LAW.

Option B is the correct answer. The best title for these notes is theories.

An explanation for an event in the natural world or the cosmos that has passed rigorous testing and verification using accepted techniques for observation, measurement, and result evaluation is referred to as a scientific theory.

A scientific theory is different from a scientific fact or law in that it explains "why" or "how." Newton's Law of Gravity, for instance, is a mathematical formula that can be used to forecast the attraction between bodies but is not a theory that explains how gravity operates.

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Answer:

B

Explanation:

Answer:

for every 1 water droplet produced, .5 hydrogen. gas is also produced

Explanation:

make one x and one y

Answer:

b. Subscripts in a formula may be changed so that the equation is balanced.

Explanation:

The statement b is not correct, because only the coefficients may be changed to balance the equation. If we change the subscript in a formula, we will change the compound.

Answer: an organ

Explanation:

Taking into account the reaction stoichiometry, H₂SO₄ is the reactant in excess and 0.00635 moles are in excess after the acid-base neutralization reaction.

Molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

molarity= number of moles÷ volume

Molarity is expressed in units moles/ L.

In first place, the balanced reaction is:

H₂SO₄ + 2 NaOH  → Na₂SO₄ + 2 H₂O

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.

You have the acid-base neutralization reaction of:

Considering the definition of molarity, you can get the amount of each compound that you have in this reaction:

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 1 mole of H₂SO₄ reacts with 2 moles of NaOH, 0.03175 moles of H₂SO₄ reacts with how many moles of NaOH?

moles of NaOH= (0.03175 moles of H₂SO₄× 2 moles of NaOH)÷ 1 mole of H₂SO₄

moles of NaOH= 0.0635 moles

But 0.0635 moles of NaOH are not available, 0.0508 moles are available. Since you have less mass than you need to react with 0.03175 moles of H₂SO₄, NaOH will be the limiting reagent and H₂SO₄ will be the excess reagent.

To determine the amount of excess reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 2 moles of NaOH reacts with 1 mole of H₂SO₄, 0.0508 moles of NaOH reacts with how many moles of H₂SO₄?

moles of H₂SO₄= (1 mole of H₂SO₄× 0.0508 moles of NaOH)÷ 2 moles of NaOH

moles of H₂SO₄= 0.0254 moles

If you have 0.03175 moles of H₂SO₄, the amount of moles in excess is calculated as:

moles in excess= 0.03175 moles - 0.0254 moles

moles in excess= 0.00635 moles

Finally, there are 0.00635 moles of NaOH in excess.

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Concussion and nerve cell damage can produce memory loss (both long-term memory and recurring short-term memory loss) because it may irreversibly damage neuron cells associated with memory.

Memory can be defined as a specific network of interconnected neurons that shape what we can remember associated with certain situations and experiences from the past. In consequence, concussions as well as nerve damage (i.e. the damage of groups of neuron cells) may cause memory loss by damaging these connections.

Learning is a process associated with both the formation of neuronal networks, which is thus associated with memory. The neurons are nerve cells that function not only to transmit information but also to store data during the formation of remembered experiences.

Therefore, we can conclude that memory loss may be associated with concussion and nerve cell damage because it lead to problem in neuronal networks.

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The temperature increases (gets warmer)

When the molecules in a substsnce vibrate faster ans faster, it shows that there is an increase the spaces between the molecules thereby leading to an increase in the kinetic enrgy of the molecule

The presence of this extra spaces causes the molecule to move freely thereby increasing the temperature of the substance.

In summary, the higher the vibration, the higher the kinetic energy, and the higher the temperature.