If 3grams of sodium reacts with 25 grams of sulfuric acid to form sodium sulfate and 1 gram of hydrogen and no sodium is left after the reaction but 9grams of acid remained unreacted how many grams of sodium sulfate were formed

Answer:

Constant velocity.

Explanation:

The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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Answer:

0.74 atm.

Explanation:

From the question given above, the following data were obtained:

Pressure of Ne (Pₙₑ) = 1.52 atm

Pressure of He (Pₕₑ) = 766 mmHg

Total pressure (Pₜ) = 3.27 atm

Pressure of Ar (Pₐᵣ) =?

Next, we shall convert the pressure of He from mmHg to atm. This can be obtained as follow:

760 mmHg = 1 atm

Therefore,

766 mmHg = 766 mmHg × 1 atm / 760 mmHg

766 mmHg = 1.01 atm

Finally, we shall determine the partial pressure of Ar. This can be obtained as follow:

Pressure of Ne (Pₙₑ) = 1.52 atm

Pressure of He (Pₕₑ) = 1.01 atm

Total pressure (Pₜ) = 3.27 atm

Pressure of Ar (Pₐᵣ) =?

Pₜ = Pₙₑ + Pₕₑ + Pₐᵣ

3.27 = 1.52 + 1.01 + Pₐᵣ

3.27 = 2.53 + Pₐᵣ

Collect like terms

3.27 – 2.53 = Pₐᵣ

Pₐᵣ = 0.74 atm

Thus the partial pressure of Ar is 0.74 atm.

an atom is the smallest unit of a pure substance or element that can exist and still retain the properties of the original substance or element

The mass of the potassium iodide will be 4.75.

Potassium iodide (KI) is a chemical compound that consists of potassium cations (K⁺) and iodide anions (I⁻). It is a white crystalline solid that is highly soluble in water and alcohol.

To calculate the mass of potassium iodide in 50.0 mL of 0.575 M KI solution, we can use the formula:

mass = volume x concentration x molar mass

First, we need to convert the volume of the solution from milliliters (mL) to liters (L), which gives:

volume = 50.0 mL = 0.0500 L

Next, we can plug in the given values for concentration and molar mass, which gives:

mass = 0.0500 L x 0.575 mol/L x 166 g/mol

Simplifying the equation gives:

mass = 4.75 g

Rounding the answer to three digits as we get:

mass = 4.75

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Thompson's model concluded that the atom contained something small and negative. The correct option to this question is C.

Thomson's description of the atomic model is one of many scientific models of the atom. Created by J.J. Thomson in 1904, shortly after the electron was discovered. However, the atomic nucleus had not yet been discovered at that time. So he proposed a model based on the known properties available at the time. Known properties are:

Atoms are neutrally charged

Inside an atom are negatively charged particles called electrons. According to the assumptions of Thomson's atomic model, an atom resembles a positively charged sphere with electrons (negatively charged particles) inside.

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Answer:to help understand the stuff more

Explanation:

Answer:

Synthetic clothes can easily build up static electricity. It also easily can catch up on fire and when it does, it melts and can fuse to your skin.

Explanation:

Answer:

Explanation:

Synthetic fibres like Polyester catches fire very easily and melts. After melting It sticks to the body of the person wearing it causing severe burns. Hence it is advised not wear synthetic clothes while working in the Kitchen. Its advised to wear Apron or cotton clothes while cooking in Kitchen.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{3.01 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.01}{6.02} = 0.5 \\ \)

We have the final answer as

Hope this helps you

Due to its very symmetric structure, BF3 (Boron Trifluoride) is non-polar. Because of its triangular planar structure, the three BF bonds' individual dipole moments cancel out, bringing the compound's overall dipole moment to zero.

Al-Cl, Si-Cl, Ni-P, Cu-Br

The difference in the electronegativity of the components determines the polarity of a bond. The propensity of an atom to gain an electron and form an anion or to have an electron nearby when in a covalent bond (sharing electrons) is known as this attribute.

The atom will find it more challenging to attract an electron the bigger the atomic radius since the attractive force will be less powerful. In the periodic table, the electronegativity rises from left to right and from bottom to top.

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The empirical formula of the compound containing 12 grams of carbon, 2 grams of hydrogen and 16 grams of oxygen is CH2O

To determine the empirical formula of a compound, one needs to know the relative amounts of each element in the compound. In this case, we are given that the compound contains 12 grams of carbon, 2 grams of hydrogen, and 16 grams of oxygen.

The first step is to convert the masses of each element into moles by dividing each by its molar mass. The molar mass of carbon is 12 g/mol, hydrogen is 1 g/mol, and oxygen is 16 g/mol. Therefore, we have:

- Carbon: 12 g / 12 g/mol = 1 mol
- Hydrogen: 2 g / 1 g/mol = 2 mol
- Oxygen: 16 g / 16 g/mol = 1 mol

Next, we need to find the simplest whole number ratio of the atoms in the compound. This is done by dividing each mole value by the smallest mole value. In this case, the smallest mole value is 1, so we divide all mole values by 1:

- Carbon: 1 mol / 1 = 1
- Hydrogen: 2 mol / 1 = 2
- Oxygen: 1 mol / 1 = 1

Therefore, the empirical formula of the compound is CH2O, which represents the simplest whole number ratio of the atoms in the compound.

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Answer:

Refer to the attachment

Answer:

D.) An acid and a base

Explanation:

One part of an acid is H+ and the other part is a negatively charged ion. One part of a base is -OH and the other part is a positively charged ion. When an acid and base react, the H+ and -OH combine to form water and the ions combine to form a salt.

The others are incorrect because they do not guarantee that water (H2O) and a salt are products.

Answer:

"2.Orbital." I think

Explanation:

Risk*

Answer:

(A) with an oxidation number of +2 and an anion

Explanation:

Answer:

A+2B-3 is the predicted formula when each metal cation has a charge of +2 and each non metal has a charge of -3

B2A3 is the final formula for the metal anion bonding to the non-metal cation in a 2:3 ratio.

A3B2 is the predicted formula with an overall charge of the compound being zero and each atom has 8 valence electrons in their outermost electron shell.

A3B2 is the predicted formula is made when each metal cation gains three electrons from the anion while each nonmetal loses 2 electrons to each of the cations.

Answer:

2802.5 KJ/mol

Explanation:

Calculate standard enthalpy of the Reaction :

6CO2(g) + 6H2O(l)C6H12O6 + 6O2(g)

using standard formation enthalpies . hence the standard enthalpy of the reaction = 2802.5 KJ/mol

attached below is the detailed solution

BOD = (14.8 - DO2) x 0.125 = 211.3 mg/LDO2 = 12.175 mg/LHence, the Biochemical Oxygen Demand (BOD) of the sample is 13.825 mg/L.

The given terms in the question are,211.3 mg/ LQ.6: 100 ml waste water sample was diluted with 800 ml of water. Initial dissolved oxygen level (DO:) was found to be 14.8 mg/1. After 5 days of incubation, the final dissolved oxygen level (DO) was found.In order to calculate the Biochemical Oxygen Demand (BOD) of a sample, the difference between the initial dissolved oxygen level (DO:) and the final dissolved oxygen level (DO) needs to be found.The formula for Biochemical Oxygen Demand is:Biochemical Oxygen Demand (BOD) = (Initial Dissolved Oxygen level) - (Final Dissolved Oxygen Level)BOD = DO1 - DO2BOD = 14.8 - DO2BOD = 14.8 - DO2.

To determine the value of DO2, first the dilution factor needs to be found.Dilution Factor = Volume of initial sample / Total VolumeDilution Factor = 100 / 800Dilution Factor = 0.125Since the initial sample was diluted by a factor of 0.125, the BOD can be calculated as follows:BOD = (DO1 - DO2) x Dilution Factor211.3 mg/L is the value of LQ, which is the conversion factor to convert milligrams per liter of oxygen to BOD value.

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Explanation:

The number acquired by an element after the lose or gain of an electron is called oxidation number.

For example, \(4Fe(s) + 3O_{2}(g) \rightarrow 2Fe_{2}O_{3}(s)\)

Here, oxidation number of Fe(s) is 0 and Fe in \(Fe_{2}O_{3}\) is +3.

Oxidation number of O in \(O_{2}(g)\) is 0 as it is present in its elemental state.

The oxidation number of O in \(Fe_{2}O_{3}\) is calculated as follows.

\(2(3) + 3x = 0\\6 + 3x = 0\\x = \frac{-6}{3}\\= -2\)

Hence,  oxidation number of O in \(Fe_{2}O_{3}\) is -2.

Chemists assign atoms to chemical elements by counting their protons. The correct option is a.

This is because each element has a unique number of protons in its nucleus, known as the atomic number, which distinguishes it from other elements. Electrons and neutrons are also important elements of an atom, but they do not determine the identity of the element.

Isotopes, on the other hand, are atoms of the same element that have different numbers of neutrons and thus different atomic masses.

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Answer:

188.1J

Explanation:

obtained from Q=MCT

Answer:

Nvr XD

Explanation:

Answer:

the world may never know

Explanation:

The statement that would best explain the observation of no liquid being evident in the sealed bottle is: b. Liquid and vapor are at equilibrium in the bottle.

When liquid and vapor are at equilibrium in a closed system, it means that the rate of condensation (liquid turning into vapor) is equal to the rate of vaporization (vapor turning into liquid). In this case, it appears that all the liquid has vaporized, and no liquid is evident. This suggests that the liquid and vapor have reached a state of equilibrium, where the amount of liquid remaining is negligible compared to the amount of vapor present.

The vapor state is favored when equilibrium is established because the pressure exerted by the vapor phase reaches a point where it equals the vapor pressure of the liquid at that temperature. At this equilibrium point, no further net condensation or vaporization occurs, resulting in the absence of visible liquid in the sealed bottle.


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The period between cell divisions is called interphase. The correct answer A.

Interphase is the period of the cell cycle that prepares the cell for division. It is comprised of three main stages:

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Answer:

1st one

Explanation:

The initial reaction of the krebs cycle involves the addition of a 2-carbon molecule to a 4-carbon molecule. So, the correct choice for answer of this problem is option (a)

The Krebs cycle, also known as the citric acid cycle, is the second major step in oxidative phosphorylation. After glycolysis has broken down glucose into smaller 3-carbon molecules, the Krebs cycle transfers the energy from these molecules to electron carriers, which are used in the electron transport chain to generate energy, ATP. There are only 4 types of reactions in the Krebs cycle: condensation, hydration/dehydration, redox and phosphorylation at the substrate level. The Krebs cycle itself actually begins when an enzyme fuses acetyl-CoA and oxaloacetate to form citrate (2-carbon molecule + 4-carbon molecule = 6-carbon molecule). This results the citric acid, which has six carbon atoms. This is the reason of Krebs cycle is also called as the citric acid cycle.

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Complete question:

The initial reaction of the krebs cycle involves the addition of a:_______

a) 2-carbon molecule to a 4-carbon molecule.

b) 3-carbon molecule to a 3-carbon molecule.

c) 4-carbon molecule to a 2-carbon molecule.

d) 6-carbon molecule to a 4-carbon molecule.