For every question the two options are iconic compounds in covalent compounds I’m not sure which one to pick some help on this would be greatly appreciated.

Around 0.999 grams of iron made up the initial sample. Mathematical definitions of molarity include: Molarity is equal to the quantity of solute in moles.

By dividing the number of moles of HCl even by volume (L) of a solution in which they were dissolved, we may get the acid solution's molarity: moles of Ce4+ = Molarity Volume (in liters)

By substituting the values specified in the problem, we obtain:

Ce4+ moles equal 0.493 M 0.03635 L 0.0179 moles.

As the reaction requires the same number of moles of Fe2+ and Ce4+, we may state that:

Fe2+ mole equivalent: 0.0179 moles

We must translate the moles of Fe2+ into grams if iron using molar mass of Fe in order to determine the amount of iron with in original sample. A mol of iron has a molar mass of 55.845 g.

Fe2+ molar mass is equal to 0.0179 moles, or 55.845 g/mol, times the mass of Fe, making Fe mass equal to 0.999 g.

Mathematical definitions of molarity include: Molarity is equal to the quantity of solute in moles. number of litres in the solution. The volume of the solution will be in litres (L), as the quantity of moles per solute was measured in moles. Therefore, mol L – 1 is the unit of molarity.

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The overall energy change for the combustion of one mole of methane according to given chemical equation is 2648 kJ/mole.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The combustion involves reactants that is 413×4 +498×2=2648 kJ.

Thus, overall energy change for the combustion of one mole of methane according to given chemical equation is 2648 kJ/mole.

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Answer:

\(n=1.732mol\)

\(\% N=18.7\%\)

Explanation:

Hello!

In this case, since the molecular formula of glycine is C₂H₅NO₂, we realize that the molar mass is 75.07 g/mol; thus, the moles in 130.0 g of glycine are:

\(n=130.0g*\frac{1mol}{75.07 g}\\\\ n=1.732mol\)

Furthermore, we can notice 75.07 grams of glycine contains 14.01 grams of nitrogen; thus, the percent nitrogen turns out:

\(\% N=\frac{14.01}{75.07}*100\% \\\\\% N=18.7\%\)

Best regards!

Answer:

radius = 16 in ; height = 27 in

The molar mass of a gas with a density of 1.02 g/L at 2.13 atm and a temperature of 20°C is 47.9 g/mol.The molar mass of an element or compound is the mass of one mole of that substance. A mole is the SI unit for the amount of a substance.

It's defined as the amount of a substance that contains the same number of entities as there are atoms in 12 grams of carbon-12.Molar mass (M) = mass (m) ÷ amount of substance (n)So, M = m/n

Where m is the mass in grams and n is the number of moles. The unit of molar mass is grams per mole (g/mol).

The ideal gas law is used to calculate the molar mass of a gas. The ideal gas law is:P V = n R T,Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

Convert the density to grams per liter: 1.02 g/L.

The density is mass/volume, thus 1.02 g/L means that 1 liter of the gas weighs 1.02 g.

This means that 1 mole of gas will occupy 22.4 L (at standard temperature and pressure, STP).Calculate the number of moles of gas using PV = nRT.P = 2.13 atmV = 22.4 L (at STP)R = 0.0821 L·atm/K·molT = 273.15 K + 20 K = 293.15 K

Thus, n = PV/RT = (2.13 atm × 22.4 L)/(0.0821 L·atm/K·mol × 293.15 K) = 0.973 mol

Calculate the molar mass (M) using M = m/n.m = density × volume = 1.02 g/L × 22.4 L = 22.848 gM = m/n = 22.848 g/0.973 mol = 23.5 g/mol Convert to units of grams per mole: 23.5 g/mol

The molar mass of a gas with a density of 1.02 g/L at 2.13 atm and a temperature of 20°C is 47.9 g/mol.

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Answer:

A

Explanation:

Answer:

The [H⁺] for this soluton is 2*10⁻³ M

Explanation:

pH, short for Hydrogen Potential and pOH, or OH potential, are parameters used to measure the degree of acidity or alkalinity of substances.

The values ​​that compose them vary from 0 to 14 and the pH value can be directly related to that of pOH by means of:

pH + pOH= 14

In this case, pOH=11.30, so

pH + 11.30= 14

Solving:

pH= 14 - 11.30

pH= 2.7

Mathematically the pH is the negative logarithm of the molar concentration of the hydrogen or proton ions (H⁺) or hydronium ions (H₃O):

´pH= - log [H⁺] = -log [H₃O]

Being pH=2.7:

2.7= - log [H⁺]

[H⁺]= 10⁻² ⁷

[H⁺]=1.995*10⁻³ M≅ 2*10⁻³ M

The [H⁺] for this soluton is 2*10⁻³ M

The pH of the NaOH solution has been 2.7. The hydrogen ion concentration of the NaOH solution has been 1.9 \(\rm \bold{\times\;10^-^3}\) M.

The pH of the solution has been used for the determination of the Hydrogen ion concentration in the solution. The higher the hydrogen ion concentration, the pH will tend to be more towards the lower side.

The pOH has been the hydroxide ion concentration in the solution, The higher the hydroxide ion concentration, the more pH will move towards the higher range.

The sum of pH and pOH has been the constant quantity.

pH + pOH = 14

The given NaOH solution has pOH 11.30. The pH of the solution will be:

pH + 11.30 = 14

pH = 14 - 11.30

pH = 2.7.

The pH of the NaOH solution has been 2.7.

pH can be defined as the negative log of the hydrogen ion concentration.

pH = -log [\(\rm H^+\)]

2.7 = log [\(\rm H^+\)]

[\(\rm H^+\)] = \(\rm 10^-^2^.^7\)

[\(\rm H^+\)] = 1.9 \(\rm \bold{\times\;10^-^3}\) M

The hydrogen ion concentration of the NaOH solution has been 1.9 \(\rm \bold{\times\;10^-^3}\) M.

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Answer:

Explanation: all the answer for the question is that link

Balance the following chemical equations:

1. N2 + 3 H2 → 2 NH3

Ex: Synthesis reaction

2. 2 KClO3 → 2 KCl + 3 O2

Single Replacement reaction

3. 2 NaF + ZnCl2 → ZnF2 + 2 NaCl

Decomposition reaction

4. 2 AlBr3 + 3 Ca(OH)2 → Al2(OH)6 + 6 CaBr2

Double Replacement reaction

5. 2 H2 + O2 → 2 H2O

Combustion reaction

6. 2 AgNO3 + MgCl2 → 2 AgCl + Mg(NO3)2

Synthesis reaction

7. 2 Al + 6 HCl → 2 AlCl3 + 3 H2

Decomposition reaction

8. C3H8 + 5 O2 → 3 CO2 + 4 H2O

Combustion reaction

9. 2 FeCl3 + 6 NaOH → Fe2O3 + 6 NaCl + 3 H2O

Double Replacement reaction

10. 4 P + 5 O2 → 2 P2O5

Synthesis reaction

11. 2 Na + 2 H2O → 2 NaOH + H2

Single Replacement reaction

12. 2 Ag2O → 4 Ag + O2

Decomposition reaction

13. C6H12O6 + 6 O2 → 6 CO2 + 6 H2O

Combustion reaction

14. 2 KBr + MgCl2 → 2 KCl + MgBr2

Double Replacement reaction

15. 2 HNO3 + Ba(OH)2 → Ba(NO3)2 + 2 H2O

Double Replacement reaction

16. C5H12 + 8 O2 → 5 CO2 + 6 H2O

Combustion reaction

17. 4 Al + 3 O2 → 2 Al2O3

Synthesis reaction

18. Fe2O3 + 2 Al → 2 Fe + Al2O3

Single Replacement reaction

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Answer:

B. Patterns can help explain observations.

Explanation:

Hope this helps

Answer:

B. Patterns can help explain observations.

Explanation:

a p e x 2021 :) Have a nice day everyone!

Answer:

A.Carbon reacting with oxygen to form co2 is not a physical change it's a chemical change :)

Answer:

Option A

Explanation:

Carbon reacting with oxygen to form carbon dioxide is a chemical change as in this process a totally new substance is formed.

Hope this helps.

The coefficients used to balance the chemical equation given in the question are 2, 4, 1 (Option A)

Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.

The reactants are located on the left side while the products are located on the right side.

Reactants —> Products

The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

Ag₂O —> Ag + O₂

There are 2 atoms of O on the right side 1 on the left. It can be balance by writing 2 before Ag₂O as shown below

2Ag₂O —> Ag + O₂

There are 4 atoms of Ag on the left side and 1 atom on the right side. It can be balance by writing 4 before Ag as shown below

2Ag₂O —> 4Ag + O₂

Now, the equation is balanced.

Thus, the coefficients are: 2, 4, 1

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Answer:

It is melting chocolate and freezing water.

Explanation:

If your melting melting chocolate it would turn into a liquid and if you freeze

water then you are turning liquid to a solid.

Melting chocolate and freezing water are the examples of phase change.

A phase change is a change in the states of matter. For example, a solid may become a liquid. This phase change is called melting. When a solid changes into a gas, it is called sublimation.

A phase transition is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states of matter: solid, liquid, and gas.

There are eight thermal processes through which matter can attain phase change. They are melting, freezing, evaporation, condensation, sublimation, deposition, ionization, and recombination.

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Answer:

62 lb

Explanation:

Step 1: Given data

Dosage of the intramuscular medication: 20 mg/kg of body weight

Mass of the intramuscular medication: 560 mg

Step 2: Calculate the body weight of the patient

560 mg IM × (1 kg BW/20 mg IM) = 28 kg BW

Step 3: Convert the body weight of the patient to pounds

We will use the relationship 1 kg = 2.20 lb.

28 kg × (2.20 lb/1 kg) = 62 lb

The formula for lithium hydrogen phosphate is Li2HPO4.

What is lithium hydrogen phosphate (Li2HPO4)?

Lithium hydrogen phosphate (Li2HPO4) is a chemical compound that contains the elements lithium, hydrogen, phosphorus, and oxygen. It is an ionic compound and a salt of phosphoric acid.

Lithium hydrogen phosphate is commonly used in the production of lithium-ion batteries and as a source of lithium ions in chemical reactions. It is also used in the synthesis of various other lithium compounds. In addition, lithium hydrogen phosphate has potential applications in the field of biomedical engineering as a material for bone tissue engineering and drug delivery.

What is an ionic compound?

An ionic compound is a type of chemical compound formed by the combination of positively charged ions (called cations) and negatively charged ions (called anions) through electrostatic attraction. The cations and anions are held together by ionic bonds, which are formed by the transfer of electrons from the cation to the anion. Ionic compounds are typically solids at room temperature and have high melting and boiling points. Examples of ionic compounds include sodium chloride (NaCl), magnesium oxide (MgO), and calcium carbonate (CaCO3).

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Answer:

D

Explanation:

cause overall charge is +1 so will attract

Answer:

b. I've seen a question like this before lol

Answer:

B

Explanation:

The molecules in a gas are very far apart compared with the molecules in a solid or a liquid. The amount of space between the molecules in a gas can change easily.

The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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The theoretical yield of Fe is 335.1 g.

54.0 g of C is needed.

The volume of CO2 produced is 0.992 L.

198.05 g of CO2 was produced.

The percent yield of the reaction is 75.2%.

The balanced chemical equation for the reaction is:

2Fe2O3 + 3C → 4Fe + 3CO2

Using the equation, we can calculate the theoretical yield of Fe and the amount of C needed.

To calculate the theoretical yield of Fe:

Convert the given mass of Fe2O3 to moles:

480 g Fe2O3 x (1 mol Fe2O3/ 160 g Fe2O3) = 3.0 mol Fe2O3

Use stoichiometry to find the moles of Fe produced:

2 mol Fe2O3 → 4 mol Fe

3.0 mol Fe2O3 x (4 mol Fe / 2 mol Fe2O3) = 6.0 mol Fe

Convert moles of Fe to grams:

6.0 mol Fe x (55.85 g Fe / 1 mol Fe) = 335.1 g Fe

To calculate the amount of C needed:

Use stoichiometry to find the moles of C needed:

2 mol Fe2O3 → 3 mol C

3.0 mol Fe2O3 x (3 mol C / 2 mol Fe2O3) = 4.5 mol C

Convert moles of C to grams:

4.5 mol C x (12.01 g C / 1 mol C) = 54.0 g C

To find the volume of CO2 produced, we need to calculate the number of moles of CO2 produced using stoichiometry.

Use stoichiometry to find the moles of CO2 produced:

2 mol Fe2O3 → 3 mol CO2

3.0 mol Fe2O3 x (3 mol CO2 / 2 mol Fe2O3) = 4.5 mol CO2

Convert moles of CO2 to volume using the ideal gas law:

PV = nRT

V = nRT/P

V = (4.5 mol) (0.0821 L atm mol^-1 K^-1) (298 K) / (1 atm)

V = 0.992 L

To find the mass of CO2 produced:

Use the molar mass of CO2 to convert from moles to grams:

4.5 mol CO2 x (44.01 g CO2 / 1 mol CO2) = 198.05 g CO2

To calculate the percent yield of the reaction:

Use the given mass of Fe (252 g) and the theoretical yield of Fe (335.1 g) to calculate the percent yield:

Percent yield = (actual yield / theoretical yield) x 100%

Percent yield = (252 g / 335.1 g) x 100%

Percent yield = 75.2%

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HI is the aqueous solution which is the most acidic. Any aqueous solution in chemistry can be divided into one of three groups, including neutral, basic, or acidic solutions.

Any aqueous solution in chemistry can be divided into one of three groups, including neutral, basic, or acidic solutions. Any aqueous solution with a pH 7.0 ([H+] > 1.0 x 10-7 M) is considered an acidic solution.

Water serves as the solvent in an aqueous solution. Solutions that are acidic are sour, whereas alkaline solutions are soapy, thus it's rarely a good idea to try an unfamiliar solution. HI is the aqueous solution which is the most acidic.

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The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

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Answer:

You need to heat the mixture to 78.37°C

Explanation:

In distillation, you can separate 2 or more compounds based on their difference in boiling points.

In a mixture of ethanol and water, in theory, you need to heat the mixture to 78.37°C. In this temperature, the ethanol must be evaporated and then condensed in the receiving flask.

The element that helps the heart and is found in nuts and legumes is magnesium.

In this case, we are being asked about the element that promotes normal heart rhythm and muscle function and can be found in nuts, legumes, whole-grain products, and dark green vegetables. We have to know that this element is one of the key elements that are important to the health of a person.

Now we have to look at the options tat we have and see that magnesium is the element that is abundant in the nuts and the legumes and have been linked to the effective function of the heart.

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The answer choice that best describes this is  C. Peter's brain still received messages from his other sensory receptors, which his brain combined with stored memories in order to move through the darkness.

Here, the sensory organs in Peter's eyes, ears, nose, mouth, and internal organs are specialized organs that allow each receptor type to convey a different sensory modality to eventually integrate into a single perceptual frame.

As a result of these sensory organs, Peter will eventually go stuttering when he wakes up in the middle of the night in complete darkness. However, he was able to make his way to the bathroom without bumping into any objects in his path.

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Peter woke up in the middle of night in darkness. Without being able to see, he was able to make his way to the bathroom without running into any objects in his path.

Which of the following best describes how he is able to do this?

A. Peter's brain received visual information from sensory receptors other than his eyes, so there was no change in how his body responded to the darkness around him.

B. Peter's brain used only stored memories as input when he moved through the darkness, as all sensory receptors are directly tied to the visual system.

C. Peter's brain still received messages from his other sensory receptors, which his brain combined with stored memories in order to move through the darkness.

D. Peter's brain used only messages received from his other sensory receptors when he moved through the darkness, as the visual system is not an important part of the central nervous system.​

Answer:

Explanation:

The pH of 0.02 M hydrochloric acid is approximately 1.7.

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The concentration of C(g) at equilibrium will increase, while the concentrations of A(g) and B(g) will decrease because they are being consumed to form more C(g). The new equilibrium concentrations will depend on the magnitude of the temperature increase and the value of the new Kc constant.

What is Equilibrium?

In chemistry, equilibrium refers to a state in which the rate of the forward reaction is equal to the rate of the reverse reaction in a chemical reaction. In other words, the concentrations of the reactants and products do not change over time, and the reaction appears to have stopped.

Equilibrium is a dynamic state because the forward and reverse reactions continue to occur at the same rate. At equilibrium, the concentrations of the reactants and products remain constant, but the concentrations of the intermediates involved in the reaction may still change as the reaction proceeds.

An increase in temperature will shift the equilibrium position of the reaction that favors the endothermic direction, i.e., in the direction that absorbs heat. The balanced chemical equation shows that the forward reaction is endothermic because it involves the formation of two moles of C(g) from one mole of A(g) and one mole of B(g).

Since Kc is a constant at a particular temperature, an increase in temperature will cause Kc to increase. This means that the ratio of product concentrations to reactant concentrations at equilibrium (Qc) will be smaller than Kc, and the reaction will shift in the forward direction to reach a new equilibrium.

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Answer:

\(heat = mc \triangle \theta \\ = 70 \times 4.18 \times (87 - 21) \\ = 19311.6 \: joules\)