Is a new can of paint open or closed system

Answer:

sodium bicarbonate

Answer:

Baking powder

Explanation:

Baking powder is a solid mixture that is used as a chemical leavening agent in baked goods. It can be composed of a number of materials, but usually contains baking soda (sodium bicarbonate, NaHCO3), cream of tartar (potassium bitartrate, C4H5KO6), and cornstarch. (A base, an acid, and a filler respectively.)

The electron will move to 2nd energy level as n = 2

An energy level (also called an electron shell) is a fixed distance from the nucleus at which an electron can exist. Electrons are small, negatively charged particles in atoms that move around a central, positive nucleus. Energy levels are a bit like stair steps. The energy emitted at a particular transition is equal to the energy difference between the two energy levels.

E(n) = −1/n² × 13.6eV

For the given case,

λ = 410.2 nm

h = 6.62 × 10⁻³⁴ j h⁻¹

c = 3 × 10⁸

E = hc/λ

E =  6.62 × 10⁻³⁴× 3 × 10⁸/410.2 × 10⁻⁹

E = 0.048 × 10⁻¹⁷ joules

E = 2.99 eV

E = -13.6 1/n²

Since, n = 6

E =  -13.6 1/6²

E = -0.38 eV

ΔE = E₂ - E₁

2.99 = -0.38 - E

-3.37 = E

-3.37 = -13.6 1/n²

n = 2

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NaH is an ionic compound as shown below, and is made of sodium cations (Na+) and hydride anions (H-). It has the same octahedral crystal structure as NaCl, with each sodium ion surrounded by six hydride ions. The free hydride ions give this molecule its strong basic character. hope this helps

Answer:

distance & electric force are inversely related

Explanation:

increasing distance decreases electric force

increasing distance decreases electric charge by a square

increasing distance decreases electric field magnitude by a square

britannica physicsclassroom

Answer:

The loss of mass does not disprove the law of conservation of mass because the evaporated fizz goes into the air. Same with lakes when there is a big body of water, but it slowly starts to look like a smaller body of water. This is because the water evaporates, but the mass is not destroyed it is just being coverted into gas.

Explanation:

Answer:What bonding pattern do you observe that you could use to predict whether a compound will be gas at standard temperature and pressure?

1 - causes the molecules of the object or surface it strikes to vibrate faster, increasing its temperature.

2-carbon dioxide, methane, nitrous oxide, and water vapor it has to be one of these 3

3-The greenhouse effect is the way in which heat is trapped close to Earth's surface by “greenhouse gases.”

4- because of the fossil fuels that people are burning for energy.

5- due to human activities

Answer:

Why ? Because 1 molecule of H2SO4 gives 2 H+ ions per molecule while only one H+ ion is required to neutralize 1 molecule of KOH. So, 1 molecule of H2SO4 can neutralize 2 molecules of KOH. Hence, we would require 525 ml of 0.03 M H2SO4 to neutralize 525 ml of 0.06 M KOH. How will we prepare 525 ml of 0.03 M H2SO4 ?

Explanation:

Now, we have 0.025 M H2SO4 and we do not know how much volume we have.

We will use the standard N1 X V1 = N2 X V2 for this calculation.

N1=0.025 M; V1=unknown; N2=0.03 M and V2=525 ml.

So V1= (0.03 X 525)/(0.025) = 630 ml.

According to the molar concentration, 684 ml of 0.25 M H₂SO₄ can be prepared from 57 mL of a 3.0 M solution of H₂SO₄.

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.In case  of 2 solutions,it is calculated as, M₁V₁=M₂V₂ substitution gives V₁=3×57/0.25=684 ml.

Thus, 684 ml of 0.25 M H₂SO₄ can be prepared from 57 mL of a 3.0 M solution of H₂SO₄.

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The electrons present in the “p” orbitals of the last shell (principal energy

level) of silicon is 6 . The principal energy level is the one which is closest to

the nucleus.

Silicon is an element which has an atomic number of 14. The electronic

configuration is also given as

1s²2s²2p⁶3s²3p².

The electronic configuration which is shown above has p orbitals of the

shell closest to the nucleus which has the ability to hold only a total of 6

electrons. This makes 6 electrons the right choice in the number of electrons

present in the principal energy level.

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The given statement "600 ml of a 5 M solution of sodium hydroxide contains 5 moles of sodium hydroxide" is false. Because 600 ml of a 5 M solution of sodium hydroxide contains 3 moles of sodium hydroxide, not 5 moles.

A 5 M (mol/L) solution means that there are 5 moles of the solute (in this case, sodium hydroxide) dissolved in 1 liter of solution. Therefore, to calculate the number of moles of sodium hydroxide in 600 ml (0.6 L) of the solution, we can use the following formula;

moles = M x L

where M will be the molarity and L will be the volume in liters.

So, moles of NaOH = 5 mol/L x 0.6 L

= 3 moles of NaOH

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No, the volume of water in a beaker is not an extensive property.

Extensive properties are those that depend on the amount or size of the substance being measured. In other words, they are properties that change with the quantity of the substance. Examples of extensive properties include mass, volume, and total energy.

In the given scenario, the volume of water in the beaker is 50 milliliters. This volume remains the same regardless of the quantity of water present. Whether it's 50 milliliters or 500 milliliters, the volume measurement does not change. Therefore, the volume of water in the beaker is an example of an intensive property.

Intensive properties are independent of the amount or size of the substance. They are characteristics that remain constant regardless of the quantity of the substance. Examples of intensive properties include temperature, density, and color.

It's important to note that the distinction between extensive and intensive properties depends on the specific property being considered. While volume is typically an extensive property for a bulk substance, in the case of a fixed volume of water in a beaker, it becomes an intensive property.

In summary, the volume of water in a beaker is not an extensive property but rather an intensive property because it does not change with the quantity of the substance.

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The temperature of an 11.2 L sample of carbon monoxide, CO, at 744 torr is 276 K or 3°C.

What is Charles's law?

Charles's law states that, "When the pressure on a sample of a dry gas is held constant, the Kelvin temperature and the volume will be in direct proportion".

V ∝ T

\(\frac{V}{T}=K\)

Where,

V is the volume of the gas,

T is the temperature of the gas (measured in kelvins), and

K is a non-zero constant.

In two different states, an initial state 1 and a final state 2, the equation is,

\(\frac{V1}{T1}=\frac{V2}{T2}\)

Given data:

V1 = 11.2L

V2 = 13.3L

T2 = 55°C = 328K

By substituting the given data,

\(\frac{11.2}{T1}=\frac{13.3L}{328K}\)

\(T1=\frac{11.2L/328K}{13.3L}\)

∴T1 = 276K = 3°C

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See the attached image.

Answer:

The magnesium atom is larger.

Explanation:

The magnesium atom is larger because it is on the left side of the Periodic Table (period 3 and group 2) where the atomic radius is larger.

Atomic radius is the distance from the center of the nucleus of an atom to the most external electron shell.

The greater the columbic attractions, the closer the protons in the nucleus are to the electrons in the outer layers, making the size of the atom smaller.

The metal sphere was made of a substance with a specific heat capacity of 4,512.48J/kg-K.

Calculate the total heat energy required to raise the temperature of the metal sphere:

Q = mc∆T

Where m is the mass of the metal sphere (0.5 kg), c is the specific heat capacity (unknown), and ∆T is the change in temperature (300 oC - 20 oC = 280 oC).

Q = (0.5 kg)(887 J/kg-K)(280 oC)

Q = 125,160 J

Calculate the total heat energy required to raise the temperature of the mercury:

Q = mc∆T

Where m is the mass of the mercury (4.08 kg), c is the specific heat capacity of mercury (0.14 J/g-K), and ∆T is the change in temperature (99 oC - 20 oC = 79 oC).

Q = (4.08 kg)(0.14 J/g-K)(79 oC)

Q = 4,512.48J/kg-K

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4500+3000=

7500grados

Answer:

It is a physical change, because you DID NOT chemically change the waters compound just by boiling it.

Explanation:

I hope this helps!

Answer:

Boiling is a physical change!

(Edited bc the person who commented told me it was physical and not to make anyone being confused when the look at this post so... yeah)

Answer:

Required Volume is 22.47ml

Explanation:

To make 2.0L of 0.2M sulfuric acid required moles = 0.2 x 2 = 0.4 moles

To get 0.4 from 17.8M required quantity = 1000/17.8 x 0.4 = 22.47ml

If the bonding in [MnO₄]⁻ is 100% ionic, then the charges on the Mn and O atoms are +7 and -2 respectively. To determine the charges on Mn and O in MnO₄⁻, we need to determine the oxidation state of each atom.

To do that, we need to use the oxidation state of oxygen, which is -2 in almost all compounds except for peroxides (H₂O₂) and superoxide (KO₂, RbO₂, CsO₂) and a few others.

Now, let's assume the oxidation state of Mn is x. The total oxidation state of  MnO₄⁻ is -1, so we can write: x + 4(-2) = -1x - 8 = -1x = +7

This means the oxidation state of Mn in  MnO₄⁻ is +7, or Mn(VII). Now that we know the oxidation state of Mn, we can find the oxidation state of each O atom: Oxygen has an oxidation state of -2,  so 4 O atoms will have a combined oxidation state of -8 (-2 x 4 = -8).We know the total oxidation state of MnO₄⁻ is -1, so we can write:+7 + (-8) = -1

This means that the total oxidation state of  MnO₄⁻ is -1. Now we can find the oxidation state of the last O atom:+7 + (-2) x 3 + x = -1x - 5 = -1x = +4 . The oxidation state of the last O atom is +4, or O(IV).

Therefore, if the bonding in  MnO₄⁻ is 100% ionic, the charges on the Mn and O atoms are +7 and -2 respectively.

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Answer:

10.88 moles of magnesium hydroxide contain 65.52 ×10²³formula units

Explanation:

Given data:

Number of formula units of magnesium hydroxide = ?

Number of moles = 10.88 mol

Solution:

The given problem will be solve by using Avogadro number.

The number 6.022×10²³ is called Avogadro number.

1 mole contain  6.022×10²³ formula units.

10.88 mol × 6.022×10²³formula units  /1 mol

65.52 ×10²³formula units

Thus, 10.88 moles of magnesium hydroxide contain 65.52 ×10²³formula units .

The nuclei of atoms become unstable when the repelling forces of the protons cannot be balanced by the number of neutrons in the nucleus. It then re-arranges itself randomly to a more stable configuration by emitting any of a series of particles. During radioactive decay, an atom does not collapse.

Since an atom is mostly empty space - that is it’s nucleus is relatively distant from the electron shells so, in the presence of extreme forces such as gravity inthe collapse of a large star, the inward pressures on the atom overcome the natural balance of the atomic structure and the ‘empty space’ disappears as nuclei are mashed together by the intense pressures and a neutron star is formed. Under even more external pressure, even the neutron star can collapse to form a black hole.

Asnwer: average atomic mass of chromium is 52amu

Calculations:

49.946amu: 4.350%= 0.0435

51.941amu: 83.790%= 0.8379

52.941amu: 9.500%= 0.095

53.939amu: 2.360%= 0.0236

Average atomic mass of chromium = 0.0435(49.946) + 0.8379(51.941) + 0.095(52.941) + 0.0236(53.939)

= 51.9963703amu

= 52 amu

Small amounts of mass are changed into power from the breaking up fission or mixture fusion of the nuclei of atoms.

The potential or strength to do paintings, inclusive of the capacity to move an item  through the utility of force. power can exist in a selection of bureaucracy, along with electrical, mechanical, chemical, thermal, or nuclear, and can be transformed from one form to some other.

In physics, electricity is the quantitative asset this is transferred to a frame or to a physical gadget, recognizable in the performance of labor and inside the shape of warmth and mild. electricity is a conserved amount the law of conservation of strength states that strength may be transformed in form, however now not created or destroyed.

Scientists define strength as the potential to do work. contemporary civilization is possible because human beings have found a way to exchange energy from one shape to other and then use it to do paintings.

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The cost category that would most likely use the number of orders placed with suppliers as its allocation base is C. Purchasing.

In many organizations, the purchasing department is responsible for managing the procurement of goods and services from suppliers. The number of orders placed with suppliers is a relevant and practical allocation base for determining the cost of the purchasing function. By using the number of orders, the organization can allocate costs such as purchase order processing, supplier relationship management, and supplier evaluation and selection to the purchasing department.

Tracking the number of orders provides a direct measure of the workload and activity level of the purchasing department. It allows the organization to assign costs to the purchasing function based on its actual usage and helps in evaluating the efficiency and effectiveness of the department. Other cost categories such as personnel, maintenance and repairs, and accounting may have different allocation bases that are more appropriate for capturing the cost drivers specific to those functions.

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Answer:

The molecular weight of Mg is 24.3 so 12 grams is 0.494 mole. So, since for every mole of Mg will result in one mole of H2, then, 0.494 mol of Mg will result in the formation of 0.494 mol of H2.

Explanation:

Answer:

A is correct
hope it helps

Explanation:

Rs can be solved by rearranging the equation as Rs = Ms / (Cw.t).

Rs is the sampling rate of a chemical which can be derived from field measurements of chemical concentrations of spot water samples taken before, during, and after deployment or through laboratory calibration experiments. The equation to calculate the concentration of chemical in a water body (Cw) after an exposure time is given by Cw = Ms / Rs.t.

To solve for Rs, we need to rearrange the equation as follows:
Cw.t = Ms / Rs
Rs = Ms / (Cw.t)

Therefore, we can solve for Rs by dividing the mass of chemical on the sampler (Ms) by the product of concentration of chemical in the water body (Cw) and the exposure period (t). This rearranged equation can be used to calculate the sampling rate of a chemical in a water body in the field or in the laboratory calibration experiments.

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Answer:h

Explanation:

G

Answer:

A) Both Assertion and Reason are correct and reason is the correct explanation of assertion.

im not sure, Cause It is Confusing me!!

just Tell me if its Right or Wrong!!