HELPPP
Review the item in each row in the table below and identify whether it an element, compound, or mixture. If it is a mixture, then also specify whether heterogeneous or homogeneous. explain how?

If we have 100 g of O₂,  the mass in  grams of Al₂O₃ will be produced is 477.8 g.

The chemical equation is as follows :

4Al (s) + 3O₂ (g) ==> 2Al₂O₃ (s)

The mass of the O₂  = 100 g

The molar mass of the O₂ = 32 g/mol

The moles of the O₂ = 100 g / 32 g/mol

The moles of the O₂ = 3.125 mol

The 3 moles of the O₂ produces the 2 moles of the Al₂O₃

The moles of the Al₂O₃ = (2/3 ) 3.125

The moles of the Al₂O₃ = 4.687 mol

The mass of the  Al₂O₃ = moles × molar mass

The mass of the Al₂O₃ = 4.687 × 101.96

The mass of the Al₂O₃ = 477.8 g

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Answer:

1.67*10^9

Explanation:

Answer:1.67*10^9

Explanation:

The cost (in dollar) of running your 100 watt light bulb at the time per month is $ 14.4

First, we shall determine the energy consumed per month by the light bulb

E = Pt

E = 0.1 × 720

E = 72 KWh

Finally, we shall determine the cost of running the light bulb. Details below

Cost = energy × Cost per KWh

Cost of running per month = 72 × 0.2

Cost of running per month = $ 14.4

Thus, we can conclude that the cost of running per month is $ 14.4

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Ammonia and phosphoric acid are the reactants for the reaction 9, for the formation of Ammonium Phosphate.

What are ionic reactions?

Ionic reaction is the reaction of ions that are anions and cations to form a compound in a medium in which they are dissolved. When ions of water-soluble salts interact with each other in aqueous medium results in the formation of water-insoluble salts.

9) 3NH₃ + H₃PO₃ → (NH₄)₃PO₄

10) CaCO₃ + HCl → CaCl₂ + H₂CO₃

11) SnO₂ + HCl → SnCl₂ + H₂O

12) Ca(OH)₂ + HNO₃ → Ca(NO₃)₂ + H₂O

13) C₃H₅O(COOH)₃ + 3KOH → C₃H₅O(COOK)₃ + 3H₂O

14) 2Mg + C₃H₅O(COOH)₃ → (C₃H₅O(COO)₃)Mg₂ + H₂

15) H₃PO₄ + 3KOH → K₃PO₄ + 3H₂O

Therefore, Ammonia and phosphoric acid are the reactants for the reaction 9, for the formation of Ammonium Phosphate.

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Explanation:

Refer to pics.............

According to the molar concentration, if the student needs 250 ml of the diluted solution, 50 ml of the original solution should be used and in second case 0.29 liters of the solution should be used.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.Substitution in second  formula gives volume= 0.36/1.25=0.288 liters. and in case of 2 solutions it is calculated as, M₁V₁=M₂V₂ and on substitution gives V₁=0.1×250/0.5=50 ml.

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Answer: highwinds and earthquake

Explanation:

"What does a tuned mass damper do?

Image result for tuned mass damper

A Tuned Mass Damper (TMD), also called a "harmonic absorber", is a device mounted to a specific location in a structure, so as to reduce the amplitude of vibration to an acceptable level whenever a strong lateral force such as an earthquake or high winds hit"

As a result, the gas's molar mass is 72.05g/mol. If 0.310 grams of a gas are present at the a temperature of 41.4 degrees and a pressure of 951 mm Hg, the molar mass of the gas is 72.05 g/mol.

The amount of a material measured in moles is multiplied either by mass of a chemical compound to get the molar mass M. MB = m/nB, where m is just the total mass of such a sample of a pure substance & nB is the sum of substance B expressed in moles, is the formula for this equation.

A chemical element or compound's molar mass is calculated by dividing its mass (in grams) by the substance's volume (mol). The standard atomic masses of the constituent atoms (in g/mol) can be added to determine the molar mass of a compound.

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The mass of Fe2S3 formed would be 12.0 g

The limiting reactant is iron (Fe)

The percent yield of iron (III) sulfide would be 108.4%

Fe + S -> FeS

From the equation, we see that one mole of Fe reacts with one mole of S to produce one mole of FeS. To determine the mass of FeS that can be formed, we need to determine which reactant is limiting and which is in excess.

Number of moles of Fe = mass / molar mass = 7.62 g / 55.845 g/mol = 0.136 moles

Number of moles of S = mass / molar mass = 8.67 g / 32.06 g/mol = 0.27 moles

We see that Fe is limiting because there are fewer moles of Fe than S. The stoichiometry of the reaction tells us that one mole of Fe produces one mole of FeS.

The mass of FeS that can be formed is:

mass = number of moles × molar mass

mass = 0.136 moles × 87.91 g/mol (molar mass of FeS)

mass = 12.0 g

percent yield = actual yield / theoretical yield × 100%

percent yield = 13.01 g / 12.0 g × 100%

percent yield = 108.4%

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To solve this problem, we first need to use stoichiometry to determine the number of moles of O2 produced by the decomposition of 37.25 grams of KCIO3.

From the balanced equation, we know that 2 moles of KCIO3 decompose to produce 3 moles of O2. Therefore, we can use the molar mass of KCIO3 to convert 37.25 grams to moles:

37.25 g KCIO3 x (1 mol KCIO3/ 122.55 g KCIO3) = 0.3032 mol KCIO3

Using the stoichiometry of the balanced equation, we can convert the moles of KCIO3 to moles of O2:

0.3032 mol KCIO3 x (3 mol O2/ 2 mol KCIO3) = 0.4548 mol O2

Now that we know the number of moles of O2 produced, we can use the ideal gas law to calculate the volume of gas produced at the given temperature and pressure.

V = nRT/P

Where:

V = volume of gas (in liters)

n = number of moles of gas

R = ideal gas constant (0.0821 L·atm/K·mol)

T = temperature (in Kelvin)

P = pressure (in atm)

First, we need to convert the temperature to Kelvin:

12.43°C + 273.15 = 285.58 K

Now we can substitute the values into the ideal gas law equation:

V = (0.4548 mol)(0.0821 L·atm/K·mol)(285.58 K)/(941.34 kPa/101.325 kPa/atm)

V = 0.0151 L or 15.1 mL (rounded to three decimal places)

Therefore, 37.25 grams of KCIO3 will produce 15.1 mL of O2 at a temperature of 12.43°C and 941.34 kPa.

Using the masses of reactants and products the balanced chemical equations are:

a)C₃H₈ + 5O₂ ⇒ 3CO₂ + 4H₂O

b) C₂H₅OH  + 3O₂ ⇒ 2CO₂ + 3H₂O

c) C₁₄H₃₀ ⇒ C₇H₁₆ + C₃H₈ + 2C₂H₄(cracking)

Equations are balanced when they have the same number of each element on both the reactant and product sides. Equations need to be balanced in order to express the conservation of mass rule appropriately.

To balance chemical equations, stoichiometric coefficients for the reactants and products are necessary. Because a chemical equation must adhere to the rules of conservation of mass and constant proportions, the reactant and product sides of the equation must have an equal number of atoms of each element.

Long chain hydrocarbons, also known as kerogens, are complex chemical molecules that can be broken down into lighter, simpler molecules by a process called cracking. It results from the dissolution of carbon-carbon bonds. The presence of a catalyst and temperature are two elements that have a significant impact on the catalyst rate.

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The minimum volume of a 0.100 M calcium hydroxide solution required to neutralize all of the dimethylglycine is 41.2 mL.

The balanced chemical equation for the reaction between dimethylglycine and calcium hydroxide is:

N(CH3)2CH2COOH + Ca(OH)2 → Ca(N(CH3)2CH2COO)2 + 2H2O

From the equation, we can see that 1 mole of dimethylglycine reacts with 1 mole of calcium hydroxide. We can use this information to calculate the amount of calcium hydroxide required to neutralize the acid.

First, we need to determine the number of moles of dimethylglycine in the sample:

molar mass of dimethylglycine = 115.13 g/mol

number of moles = 475 mg / 1000 mg/g / 115.13 g/mol = 0.00412 mol

Since 1 mole of dimethylglycine reacts with 1 mole of calcium hydroxide, we need 0.00412 mol of calcium hydroxide to neutralize the acid.

Finally, we can use the molarity of the calcium hydroxide solution to determine the volume required:

moles of Ca(OH)2 = 0.00412 mol

volume of Ca(OH)2 solution = moles / molarity = 0.00412 mol / 0.100 mol/L = 0.0412 L

Converting this to milliliters:

volume of Ca(OH)2 solution = 41.2 mL

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The type of solution would you have if you have a sealed container with 100g of water and 0.15g of dissolved CO₂ at 40°C is a saturated solution.

A saturated solution is a solution that has dissolved as much solute as it is capable of dissolving. In a saturated solution, no more solute can be dissolved at a given temperature. We can make an saturated solution by keep on dissolving solute until no more solute can be dissolved.

Given,

mass of water = 100g

mass of dissolved CO₂ = 0.15g  

Solubility = (weight of solute ÷ weight of solvent)×100

Solubility = (0.15 ÷ 100)×100 = 0.15g

Therefore, the type of solution would you have if you have a sealed container with 100g of water and 0.15g of dissolved CO₂ at 40°C is a saturated solution.

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Answer:

saturated

Explanation:

The mole ratio of Na₂CO3 to Al₂(CO3)3 can be determined by comparing the coefficients in the balanced chemical equation for the reaction involving these two compounds.

Mole ratio is a term used in chemistry to describe the relationship between the amount of two or more substances in a chemical reaction. It is the ratio of the number of moles of one substance to the number of moles of another substance involved in the reaction.

A mole is a unit of measurement used in chemistry to quantify the amount of a substance. One mole of any substance contains Avogadro's number of particles, which is approximately 6.02 x 10^23 particles. Therefore, a mole ratio describes the relative amounts of substances in terms of the number of moles.

The mole ratio of Na₂CO3 to Al₂(CO3)3 can be determined by comparing the coefficients in the balanced chemical equation for the reaction involving these two compounds.

However, since a reaction is not specified, I can't give you an exact answer.

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Energy in chemical reactions involves the process in which it is absorbed to break bonds, and energy is evolved as bonds are made.

This is referred to as a process in which one or more substances, the reactants, are converted to one or more different substances, the products.

According to the modern view of chemical reactions, bonds between atoms in the reactants must be broken, and the atoms or pieces of molecules are reassembled into products by forming new bonds. All chemical reactions involve energy changes ad in some reactions, we are able to observe these energy changes as either an increase or a decrease.

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Knowing each element's mass and molar mass allows one to compute the percentage of zinc and copper that is present in a coin.

The mass in grams from one mole of a chemical is its molar mass. 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.

A substance's molar mass is the volume of the material that contains one mole of the substance. Its basic definition seems to be the weight of a single mole of a substance. The atomic mass of the each substance then multiplied by the subscript of such a element inside the chemical formula to determine the molar mass.

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Answer:

No picture shown above?

The mass number of an atom is the sum of its number of its number of protons and number of neutrons. Hence the oxygen atom with 10 neutrons and 10 electrons has a 8 protons thus has the mass number of 18 .

Mass number if a basic measurement of an atom indicating the mass of the nucleons in the atom by their number. The mass number of an atom is the sum of its number of protons and number of neutrons.

The atomic number of an atom is the number of electrons in its neutral state. The number of electrons is equal to the number of protons in neutral state. Oxygen is 8th element having 8 protons and 8 electrons.

Oxygen can gain two electrons to achieve octet in its valence shell and can have total 10 electrons. However the number of protons is not changing. Hence if it has 10 neutrons, then its mass number is 10 +8 = 18.

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The four main components of WHMIS 2015 of the system are worker education and training, labelling, hazard identification and product classification, and safety data sheets (SDS). The correct answer is True.

WHMIS 2015 is a comprehensive system designed to ensure the safe use, handling, storage, and disposal of hazardous chemicals in Canadian workplaces. Worker education and training are essential to ensure that workers understand the hazards associated with the chemicals they use and how to work safely with them. Labelling helps to identify hazardous products and communicate the hazards to workers, while hazard identification and product classification ensure that hazardous products are properly classified and labelled.

Finally, SDS provide detailed information on the hazards of a product and the precautions that need to be taken when working with it. All of these components work together to ensure that hazardous chemicals are handled safely and that workers are protected from harm.

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Over-watering and aggressive plowing can have a variety of negative effects on the land used for crop production.

How are these activities likely to have impacted the land?

Some potential consequences of these practices include:

Overall, these activities can have a negative impact on the health of the land and reduce its productivity over time. To mitigate these effects, it may be necessary to adopt more sustainable farming practices, such as conservation tillage and crop rotation, that help to preserve the health of the soil and maintain its productivity.

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Ce(IO3)3 will not precipitate from the solution.

To determine if Ce(IO3)3 will precipitate from the solution, we need to calculate the concentration of Ce3+ and IO3- ions in the solution, and then use the solubility product constant (Ksp) to determine if a precipitate will form.

First, let's calculate the number of moles of Ce(NO3)3 added to the solution:

nCe(NO3)3 = (750.0 mL) (4.00 x 10^-33 mol/L) = 3.00 x 10^-30 mol Ce(NO3)3

Next, let's calculate the number of moles of KIO3 in the solution:

nKIO3 = (300.0 mL) (2.00 x 10^-2 mol/L) = 6.00 x 10^-3 mol KIO3

Since KIO3 is a strong electrolyte, it will dissociate completely in solution, giving us the same number of moles of IO3- ions:

nIO3- = 6.00 x 10^-3 mol

Since Ce(NO3)3 is also a strong electrolyte, it will dissociate completely to give us 3 times the number of moles of Ce3+ ions:

nCe3+ = 3.00 x 10^-30 mol x 3 = 9.00 x 10^-30 mol

Now, let's calculate the concentration of Ce3+ ions:

[Ce3+] = (9.00 x 10^-30 mol) / (1050.0 mL) = 8.57 x 10^-34 M

Finally, we can calculate the ion product (IP) of Ce(IO3)3:

IP = [Ce3+] [IO3-]^3 = (8.57 x 10^-34)^1 (6.00 x 10^-3)^3 = 7.34 x 10^-41

Comparing this value to the Ksp of Ce(IO3)3 (1.9 × 10^-10), we see that IP << Ksp.

Therefore, Ce(IO3)3 will not precipitate from the solution, and the solution will remain homogeneous.

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The number of phases present is two.

There are two phases present in sweetened iced tea with sugar and ice cubes. The first phase is the liquid phase of the tea, which contains water, sugar, and other dissolved substances.

The second phase is the solid phase of ice cubes, which contains solid water molecules. These two phases are in contact with each other, and the sugar molecules in the liquid phase are dissolved in the water molecules.

The ice cubes, being a solid, do not dissolve in the liquid phase but coexist with it in the same container.

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The change in entropy for each reaction is;

1)  -198 J/mol

2) -5 J/mol

3) -148 J/mol

The change in entropy, denoted as ΔS, is a measure of the amount of disorder or randomness in a system before and after a process or reaction. It is defined as the difference between the entropy of the final state and the entropy of the initial state.

The formula for calculating the change in entropy is:

ΔS = S_final - S_initial

where ΔS is the change in entropy, S_final is the entropy of the final state, and S_initial is the entropy of the initial state.

We have that;

1) 2(192.5) - [3(130.58) + 191.50]

= 385 - [391.74 + 191.50]

= -198 J/mol

2) [213.6 + 2(188.83] - [186.3 + 2(205]

= -5 J/mol

3) 2(220) - [2(191.50) + 205]

-148 J/mol

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The density of a substance is its mass divided by volume. The density of the substance with a mass of 108.75 g and volume of 75 ml is 1.45 g/ml.

The density of a substance is the  measure of its mass per unit volume. Density describes how closely its particles are packed. The density of a substance depends on the bond type, molecular weight, temperature and pressure as well.

The floating property of a substance on a fluid depends on its density. If it has less density than the fluid it will float on it.

Given,

the mass of the object m = 108.75 g

volume = 75 ml

density = mass/ volume

d = 108.75 g /75 ml

   = 1.45 g/ml.

Therefore, the density of the substance with the mass of 108.75 g and 75 ml volume is 1.45 g/ml.

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Answer:

3 mol/L

Explanation:

Molarity = No. of moles of solute/Volume of solution in L

Answer: Your welcome!

Explanation:

Answer 1: Ice, water, sugar, lemon juice

Answer 2: Liquid in a gas

Answer 3: Saturated

Answer 4: Dissolution

Answer 5: Moles of solute/liters of solution

Answer 6: Strong electrolytes completely dissociate in water, weak electrolytes partially dissociate, and nonelectrolytes do not dissociate.

Answer 7: Molarity

Answer 8: Saturated

Answer 9: Freezing-point depression

Answer 10: Silver chloride (AgCl)

Wavelength (L) is calculated using: L = gT²/2π, here g=9.8 m/s2 and T is wave period in seconds.

Wavelength of a wave describes how long the wave is and the distance from the "crest" (top) of one wave to the crest of next wave is called wavelength. We can also measure from the "trough" (bottom) of one wave to trough of next wave and get the same value for the wavelength.

We measure wavelength in following ways:

Use photometer to measure the energy of wave.

Convert energy into joules (J).

Divide energy by Planck's constant, 6.626 x 10⁻³⁴, to get the frequency of  wave.

Divide speed of light, ~300,000,000 m/s, by frequency to get wavelength.

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The scientist I have chosen is J.J. Thomson, who made significant contributions to the study of atomic structure in the late 19th and early 20th centuries.

Thomson's most well-known contribution is his discovery of the electron, which he identified as a negatively charged particle present in all atoms. This discovery formed the basis of Thomson's "plum pudding" model of the atom, which proposed that atoms consisted of a positively charged "pudding" with negatively charged electrons scattered throughout.

While this model was eventually disproven, Thomson's discovery of the electron and his work on the measurement of atomic and molecular masses laid the foundation for the modern atomic model. Specifically, Thomson's work on mass spectrometry led to the development of more advanced techniques for determining the masses and properties of atoms and molecules, which are still used in modern research today.

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The periodic chart is a tabular collection of chemical elements arranged according to atomic number, starting with hydrogen and going up to oganesson, which has the greatest atomic number.

In the periodic table, also referred to as the periodic chart of the (chemical) elements, the chemical elements are organised in rows and columns. It is frequently used in physics, chemistry, and other academic fields and is widely recognised as a sign of chemistry.

This is a visual representation of the periodic law, which states that the properties of molecular elements depend approximately periodically on their atomic numbers. There are four roughly rectangular "pieces" that make up the table's top.

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The answer for this question would be pH=3.0

Hope this helps :)

pH of HCl solution is 4.

pH may be defined as a measure of free acidity.

More precisely, pH is defined as the negative log of the hydrogen ion concentration.

                                                      pH = - log [H⁺]

The range of pH extends from zero to 14.

A pH value of 7 is neutral, because pure water has a pH value of exactly 7. Values lower than 7 are acidic; values greater than 7 are basic or alkaline.

Given,

Moles of HCl = 10⁻⁴

We know that, pH = - log [H⁺]

                         pH = - log (10⁻⁴)

                            pH = 4

Therefore, H⁺ concentration in a solution with a pH of 3.75 is 1.7 × 10⁻⁴

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