What metal impurity makes rubies red and emeralds green?.

Answer:

There are C - C  bonds and C - H bonds.

trust me! I took a test with this question and got 100! :)

Explanation:

Answer:

67.1%

Explanation:

Based on the chemical equation, if we determine the moles of sodium carbonate, we can find the moles of NaHCO₃ that reacted and its mass, thus:

Moles Na₂CO₃ - 105.99g/mol-:

6.35g * (1mol / 105.99g) = 0.0599 moles of Na₂CO₃ are produced.

As 1 mole of sodium carbonate is produced when 2 moles of NaHCO₃ reacted, moles of NaHCO₃ that reacted are:

0.0599 moles of Na₂CO₃ * (2 moles NaHCO₃ / 1 mole Na₂CO₃) = 0.1198 moles of NaHCO₃

And the mass of NaHCO₃ in the sample (Molar mass: 84g/mol):

0.1198 moles of NaHCO₃ * (84g / mol) = 10.06g of NaHCO₃ were in the original sample.

And percent of NaHCO₃ in the sample is:

10.06g NaHCO₃ / 15g Sample * 100 =

Answer: Aspirin

Explanation:

It is true that water has a higher latent heat of vaporization than most other common liquids.

Latent heat of vaporisation is the amount of energy that is required to transform one gram of liquid water into water vapor.

Water has a very high heat of vaporisation because of the network of hydrogen bonding present between water molecules. Water's heat of vaporization is around 540 cal/g at 100 °C.

Compared to other liquid molecules, water has a higher heat of vaporisation.

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Answer:

Explanation:

To calculate the volume of ethyl alcohol that evaporated, we need to know the volume of ethyl alcohol that was present initially, the volume of ethyl alcohol after the evaporation, and the molar mass of ethyl alcohol.

Let's assume that the initial volume of ethyl alcohol is V_0 mL and the final volume is V_f mL. The volume of ethyl alcohol that evaporated is then V_e = V_0 - V_f mL.

We can use the ideal gas law to relate the volume of a gas to the number of moles of the gas present. The ideal gas law is given by:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.

Since the volume of a gas is directly proportional to the number of moles of the gas, we can write:

V/n = k

where k is a proportionality constant.

If we know the value of k for a given gas at a particular temperature and pressure, we can use this relationship to calculate the number of moles of the gas present.

In this case, we are told that 1 mole of any gas at STP (standard temperature and pressure) occupies a volume of 22.4 L, which is equivalent to 22,400 mL. Therefore, the value of k for any gas at STP is 22,400 mL/mol.

We can use this value of k to calculate the number of moles of ethyl alcohol that evaporated:

n = V_e/(22,400 mL/mol)

Substituting in the known values for V_e and k, we can calculate the number of moles of ethyl alcohol that evaporated.

For example, if the initial volume of ethyl alcohol was 1,000 mL and the final volume was 900 mL, the volume of ethyl alcohol that evaporated would be V_e = 1,000 mL - 900 mL = 100 mL. The number of moles of ethyl alcohol that evaporated would be:

n = 100 mL/(22,400 mL/mol) = 0.0044 moles

I hope this helps! Let me know if you have any questions.

a) The oxidation state of Fe in [Fe(NH3)4Cl2]NO3 is +2, as the sum of charges on the ligands is -2 (4x0 for NH3 and 2x(-1) for Cl).
b) The oxidation state of Cr in (NH4)4[Cr(CN)6] is +3, as the sum of charges on the ligands is -6 (6x(-1) for CN).
c) The oxidation state of Ni in [Ni(NH3)4]SO4 is +2, as the sum of charges on the ligands is 0 (4x0 for NH3) and the counter ion is SO4 with a charge of -2.
d) The oxidation state of Co in Na[Co(NO2)4(H2O)2] is +3, as the sum of charges on the ligands is -3 (4x(-1) for NO2 and 2x0 for H2O). a) [Fe(NH3)4Cl2]NO3

The complex ion is neutral overall, so the sum of the oxidation states of all atoms in the complex must be zero.

The oxidation state of nitrogen in NH3 is -3, so the total oxidation state of nitrogen in the complex is -12.

The oxidation state of chloride in Cl2 is -1, so the total oxidation state of chloride in the complex is -2.

The oxidation state of oxygen in NO3 is -2, so the total oxidation state of nitrogen in the complex is -2.

Therefore, the oxidation state of iron in the complex must be +3 to balance the oxidation states of all other atoms:

[Fe(NH3)4Cl2]NO3: Fe3+

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The amount of HCl produced when 57.49 grams of H₂SO4 after a chemical reaction with 98.20 grams of NaCl (in grams) is found out being  42.70 grams.

The balanced chemical equation as per the mentioned case, the reaction between H₂SO₄ and NaCl can be represented as,

H₂SO₄ + 2 NaCl -----> 2 HCl + Na₂SO₄

We are needed to use stoichiometry in the way to know the amount of HCl produced out from the given amounts of H₂SO₄ and NaCl.

Step 1: Convert the given masses of H₂SO₄ and NaCl into an amount of equivalent moles.

Molar mass of H₂SO₄ is = 98.08 g/mol

Molar mass of NaCl is 58.44 g/mol

Number of moles of H₂SO₄  = 57.49 g / 98.08 g/mol = 0.586 mol

Number of moles of NaCl = 98.20 g / 58.44 g/mol = 1.679 mol

Step 2: Now we have to balance the chemical equation to know the mole ratio for H₂SO₄ to HCl.

From the balanced equation, we observe that 1 mole of H₂SO₄ produces 2 moles of HCl. Therefore, the 0.586 moles of H₂SO₄ will be producing about 2 × 0.586 = 1.172 moles of HCl.

Lastly, Convert the moles of HCl to grams.

Molar mass of HCl = 36.46 g/mol

Mass of HCl produced = 1.172 mol × 36.46 g/mol = 42.70 g

Therefore, it can be concluded that about 57.49 grams of H₂SO₄ would be reacting with nearly 98.20 grams of NaCl in order to produce out about 42.70 grams of HCl.

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Answer: Yes.

Explanation:

the number of protons in the nucleus determines an element's identity. Chemical changes do not affect the nucleus, so chemical changes cannot change one type of atom into another. The number of protons in a nucleus does change sometimes, however. The identity of the atom, therefore, changes.

1. calcium chloride suitable method is Chemical drying method.

2. Hydrogen chloride, suitable method is Absorption method.

3. Methane, suitable method is Adsorption method.

4. Naphtha, suitable method is condensation method.

5. Calcium chloride, suitable method is Chemical method.

6.  Hydrogen fluoride, suitable method is Absorption method.

What are gases?

Gases are samples of matter that has no fixed shape and takes the shape of the container it is filled into.

Gases such as calcium chloride can be dried through chemical drying method.

In conclusion, gases has no fixed shape and takes the shape of the container it occupies.

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After 8 hours, approximately 15,729 foodborne bacteria will be present in the culture.

To find the growth rate, k, we can use the given information. Using the uninhibited growth formula:

A = A₀ · \(e^(kt)\),

where A is the final amount, A₀ is the initial amount, t is the time, and e is the base of the natural logarithm.

Given that the initial amount is 100 bacteria (A₀ = 100) and the amount after 1 hour is 350 bacteria (A = 350), we can plug these values into the equation:

350 = 100 · \(e^(kt)\).

Simplifying the equation, we have:

\(e^(kt)\) = 3.5.   [Equation 1]

Now, we need to solve for k. Taking the natural logarithm (ln) of both sides of Equation 1:

ln(\(e^k\)) = ln(3.5),

k = ln(3.5).

Using a calculator, we find that k ≈ 1.2528.

Now, we can use the growth rate k to answer the question. Plugging the values into the uninhibited growth formula with t = 8 hours:

A = 100 · \(e^(1.2528 · 8)\).

Evaluating the equation, we find:

A ≈ 15,729.

Therefore, after 8 hours, approximately 15,729 foodborne bacteria will be present in the culture.

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Answer:

An increase in the speed of the molecules competes with the attraction between molecules and causes molecules to move a little further apart. Cooling a liquid decreases the speed of the molecules.

Explanation:

Answer:

The photographic evidence of a long-unseen cosmic force is an extraordinary achievement in science. ... Exciting as it is, the photo actually doesn't capture the black hole itself, nor its interior. Astronomers aimed their telescopes at the event horizon, the invisible boundary thought to surround all black holes

Explanation:

Hope this helps :)

Answer:

A. 1s²2s²

B. 1s²

C. 1s²

D. 1s²2s²2p⁶

Explanation:

The valency electron is the outer electron of an element. The valency electron resides in the outermost region of the shell.

Using the general configuration for the first 20 elements 2 8 8 2 the valency electrons can be identified.

A. 1s²2s²2p⁶3s² . The valency electron here are 2p⁶ and 3s² . Removing the valency electron we have 1s²2s²

B. 1s² 2s² 2p⁶. After removing the valency electron the configuration will be 1s².

C.1s²2s². After removing the valency electron the configuration will be 1s²

D.1s²2s²2p⁶3s¹. Removing the valency electron the electron configuration will be 1s²2s²2p⁶

Answer:

it sucks up stuff,cleans around the house,and can be emptied

Explanation:

because its what it is spose to do

Answer:

a space entirely devoid of matter.

Explanation:

Answer:

Mushroom and algae are part of the fungi group

The statement that identifies the greatest single reason that the value of Kp for the overall reaction at 298 K has such a large magnitude is the activation energy for the slow step is small, option B is correct.

The overall reaction is H₂(g) + Cl₂(g) → 2 HCl(g)

It can be represented by the following rate law:

Rate = k[H₂][Cl₂].

The value of Kp for this reaction is large because the mechanism proposed by the student involves a slow, rate-determining (Step 1) with a large positive enthalpy change, followed by two fast steps with relatively small enthalpy changes.

The rate of the overall reaction is limited by the slow step, which involves the breaking of the Cl-Cl bond in Cl₂. As a result, the concentration of Cl atoms is relatively low compared to the concentration of Cl₂ molecules, leading to a high value of Kp, option B is correct.

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The complete question is:

HCl(g) can be synthesized from H₂(g) and Cl₂(g) as represented above. A student studying the kinetics of the reaction proposes the following mechanism

Step 1: Cl₂(g) → 2 Cl(g) (slow) ∆H° = 242 kJ/mol rxn

Step 2: H₂(g) + Cl(g) → HCl(g) + H(g) (fast) ∆H° = 4 kJ/mol rxn

Step 3: H(g) + Cl(g) → HCl(g) (fast) ∆H° = -432 kJ/mol rxn

Which of the following statements identifies the greatest single reason that the value of Kp for the overall reaction at 298 K has such a large magnitude?

A. The value of ∆H for the overall reaction is large and negative.

B. The activation energy for the slow step is small.

C. The concentration of Cl₂ is much larger than that of H₂.

D. The concentration of HCl is much smaller than that of H₂ and Cl₂.

(a) Net energy entering the system as heat is Q₁ + Q₂ + Q₃. (b) Net work done by the gas is W = Q - n * Cᵥ * ΔT. (c) Efficiency of the cycle is  (W / Q₁) * 100.

To solve this problem, we can analyze each step of the cycle and calculate the net energy entering the system as heat, the net work done by the gas, and the efficiency of the cycle.

Given:

Number of moles of the gas (n) = 2.6 mol

Initial volume (V₁) = 7.2 L

Initial temperature (T₁) = 320 K

Final temperature (T₂) = 640 K

(a) Net energy entering the system as heat:

In the first step, the gas is heated at constant volume. Therefore, no work is done during this step, and the heat transfer is given by the formula:

Q₁ = n * Cᵥ * ΔT

Where:

Q₁ is the heat transfer at constant volume,

n is the number of moles of the gas,

Cᵥ is the molar heat capacity at constant volume, and

ΔT is the change in temperature.

For a monatomic ideal gas, the molar heat capacity at constant volume is Cᵥ = (3/2)R, where R is the molar gas constant (8.314 J/(mol·K)).

Q₁ = 2.6 mol * (3/2) * 8.314 J/(mol·K) * (640 K - 320 K)

Q₁ = 2.6 mol * (3/2) * 8.314 J/(mol·K) * 320 K

In the second step, the gas expands isothermally. Since the temperature remains constant, the heat transfer during this step is zero (Q₂ = 0).

In the third step, the gas is compressed at constant pressure. The heat transfer during this step is given by:

Q₃ = n * Cₚ * ΔT

Where:

Q₃ is the heat transfer at constant pressure,

Cₚ is the molar heat capacity at constant pressure,

and ΔT is the change in temperature.

For a monatomic ideal gas, the molar heat capacity at constant pressure is Cₚ = (5/2)R.

Q₃ = 2.6 mol * (5/2) * 8.314 J/(mol·K) * (320 K - 640 K)

Q₃ = 2.6 mol * (5/2) * 8.314 J/(mol·K) * (-320 K)

The net energy entering the system as heat is given by the sum of the heat transfers in each step:

Net energy entering the system as heat = Q₁ + Q₂ + Q₃

(b) Net work done by the gas:

The net work done by the gas can be calculated using the first law of thermodynamics:

W = Q - ΔU

Where:

W is the net work done by the gas,

Q is the net energy entering the system as heat, and

ΔU is the change in internal energy of the gas.

In an ideal gas, the change in internal energy is given by:

ΔU = n * Cᵥ * ΔT

Therefore,

W = Q - n * Cᵥ * ΔT

(c) Efficiency of the cycle:

The efficiency of the cycle can be calculated using the formula:

Efficiency = (W / Q₁) * 100

Substituting the values into the formulas will give us the numerical values and units for each quantity.

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The correct formula for the compound formed between barium and sulfur is BaS. Ba

The correct formula for the compound formed between barium and sulfur is BaS. Ba represents the chemical symbol for barium, and S represents the chemical symbol for sulfur. When barium and sulfur combine, they form an ionic compound with a 1:1 ratio of barium ions (Ba2+) and sulfide ions (S2-). The compound BaS indicates that one barium atom combines with one sulfur atom to form an ionic compound. In BaS, barium has a 2+ charge (Ba2+), and sulfur has a 2- charge (S2-).

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The correct answer is 107.9 g of Ag is produced from a reaction of 31. 75 gram of Copper.

Molar mass of a substance is the mass in grams of one mole of the compound. A mole is the measurement of the number of things, such as atoms, molecules, and ions, that are present in a substance. Any material has 6.022 x 1023 molecules in a mole, it is known as Avogadro's number . The mole is used to determine the size of the tiniest entities quantitatively, just as we use a standard value to quantify many things, such as 1 dozen = 12 items.

Formula - Molar mass = mass in grams/mole = g/mol

Molar mass of a substance can be calculated as:

Given,

n = W/M, where

W = required mass

M= molar mas

Given chemical reaction is:

Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag

From the stoichiometry of the reaction,

1 mole of Cu = produce 2 moles of Ag

Given mass of Cu = 31.75g

Molar mass of Cu = 63.5g/mol

Moles of Cu = 31.75g / 63.5g/mol = 0.5 moles

0.5 moles of Cu = produce 2×0.5 = 1 mole of Ag

Molar mass of Ag = 107.9g/mol

Required mass of Ag = 1mol × 107.9g/mol = 107.9 g

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Answer:

False

Explanation:

#Everything4Zalo

Answer:

False

Explanation:

As atomic radius decreases, electronegativity increases. This is mostly because a smaller atomic radius represents a stronger hold on the valence electrons.

First, let's remember the formula to calculate an object's density:

Then, we analyze what we have:

We need to determine the volume, so we transform our formula like this:

We replace our data:

Then, the answer is that the volume equals 12.4 cm^3.

To determine if an Ester has formed, you would typically look for the following indicators: physical appearance, odor, spectroscopic analysis, etc.

The formation of an ester often results in a noticeable change in the physical appearance of the reaction mixture.

Change in odor: Esters often have distinct and characteristic smells. If an ester has formed, you may detect a new odor in the reaction mixture that is different from the smells of the reactants.

Spectroscopic techniques such as infrared (IR) spectroscopy or nuclear magnetic resonance (NMR) spectroscopy can be used to identify the presence of an ester.

Chemical tests: There are specific chemical tests that can be performed to confirm the presence of an ester.

Thus, this way, one can know the formation of ester.

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To solve such this we must know the concept of dehydration reaction. Therefore, an equation that shows the dehydration of sodium carbonate decahydrate is

Na\(_2\)CO\(_3\).10H\(_2\)O\(\rightarrow\) Na\(_2\)CO\(_3\).H\(_2\)O+ 10H\(_2\)O

Na\(_2\)CO\(_3\).H\(_2\)O\(\rightarrow\) Na\(_2\)CO\(_3\) + H\(_2\)O

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

A condensation reaction is a sort of dehydration process. During the method of combining compounds, a molecule of water is taken from one of reaction mixture, resulting in the formation of an unsaturated chemical. Another distinguishing feature of a dehydration process is that the primary products has always been water.

Na\(_2\)CO\(_3\).10H\(_2\)O\(\rightarrow\) Na\(_2\)CO\(_3\).H\(_2\)O+ 10H\(_2\)O

Na\(_2\)CO\(_3\).H\(_2\)O\(\rightarrow\) Na\(_2\)CO\(_3\) + H\(_2\)O

Therefore, an equation that shows the dehydration of sodium carbonate decahydrate is

Na\(_2\)CO\(_3\).10H\(_2\)O\(\rightarrow\) Na\(_2\)CO\(_3\).H\(_2\)O+ 10H\(_2\)O

Na\(_2\)CO\(_3\).H\(_2\)O\(\rightarrow\)  Na\(_2\)CO\(_3\) + H\(_2\)O

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Answer:

Kinetic energy is always 12mv2 , which in this case, is 3.2 J. Explanation: 12mv2=12(0.1 )(8.0)2=3.2J.

Answer:An atom

Explanation:

Because  molecules more spread out and have things that connnect them and are not bunched up togoether

And Atoms are all packed up like in the picture

Hope this helps!:D

The diagram shown is that of a molecule as it is made up of two different kinds of atoms.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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