pls helppp me i dot get this

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

We have

\(density = \frac{8}{32} = \frac{1}{4} \\ \)

We have the final answer as

Hope this helps you

The balanced equation for the given reaction is; H2 + I2 ⇌ 2HI The number of moles of HI at equilibrium with 1.25 mol of H2 and 1.25 mol of I2 in a 5.00 L flask at 448°C is 1.000 mol.

The value of equilibrium constant Kc is 50.2 at 448°C.

Now, we have to calculate the number of moles of HI that are at equilibrium with 1.25 mol of H2 and 1.25 mol of I2 in a 5.00-L flask at 448°C.

We'll start by writing the equation for the reaction and make an ICE table, where ICE stands for the initial concentration, the change in concentration, and the equilibrium concentration respectively.I C E 1.25 mol 0 mol 0.625 mol1.25 mol 0 mol 0.625 mol0 mol +2x 2xNow we can substitute these values into the expression for the equilibrium constant Kc to solve for x.

The expression for Kc in terms of concentrations is;Kc = [HI]2 / [H2][I2]Plug in the values of equilibrium concentrations;50.2 = (0.625 + 2x)2 / (1.25 - x)2 where x is the change in molarity of the reactants and products from the initial concentration. Solving this equation for x;x = 0.1875So the equilibrium concentration of HI is 0.625 + 2(0.1875) = 1.000 mol in a 5.00 L flask.

Thus, the number of moles of HI at equilibrium with 1.25 mol of H2 and 1.25 mol of I2 in a 5.00 L flask at 448°C is 1.000 mol.

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Mass of magnesium (Mg) = 0.12 g

Atomic mass of Mg = 24.31 g/mol (from periodic table)

Number of moles of Mg = Mass of Mg / Atomic mass of Mg

= 0.12 g / 24.31 g/mol

= 0.00494 mol

Number of moles of O₂ = Number of moles of MgO produced / 2

= 0.00650 mol / 2

= 0.00325 mol

When the experiment is performed without the crucible cover, the magnesium oxide created reacts with any oxygen in the air. When more oxygen reacts with the magnesium, the amount of magnesium oxide generated will be larger than when the experiment was run without a cover on the crucible.

Also, any water vapour or other gases in the air may react with the magnesium oxide, influencing the final product's mass. As a result of the existence of extra reactants in the air, the mass of magnesium oxide formed will change when the crucible is not covered.

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The values of balanced chemical reaction is w = 1, x = 6, y = 3, and z = 2

To balance the chemical equation:

1. Balancing nitrogen (N):

There are three nitrogen atoms on the left side (Ba₃N₂), so we need to place a coefficient of 3 in front of NH₃:

w Ba₃N₂ + x H₂O → y Ba(OH)₂ + 3 z NH₃

2. Balancing hydrogen (H):

There are six hydrogen atoms on the left side (2 × 3), so we need to place a coefficient of 6 in front of H₂O:

w Ba₃N₂ + 6 H₂O → y Ba(OH)₂ + 3 z NH₃

3. Balancing barium (Ba):

There are three barium atoms on the left side (3 × Ba₃N₂), so we need to place a coefficient of 3 in front of Ba(OH)₂:

w Ba₃N₂ + 6 H₂O → 3 y Ba(OH)₂ + 3 z NH₃

4. Balancing oxygen (O):

There are six oxygen atoms on the right side (6 × OH), so we need to place a coefficient of 3 in front of Ba(OH)₂:

w Ba₃N₂ + 6 H₂O → 3 Ba(OH)₂ + 3 z NH₃

Now the equation is balanced with the following coefficients:

w Ba₃N₂ + 6 H₂O → 3 Ba(OH)₂ + 3 z NH₃

Therefore, w = 1, x = 6, y = 3, and z = 2 would satisfy the balanced chemical equation.

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Answer:

Warm fronts often bring stormy weather as the warm air mass at the surface rises above the cool air mass, making clouds and storms. Warm fronts move more slowly than cold fronts because it is more difficult for the warm air to push the cold, dense air across the Earth's surface.

Explanation:

Good luck!

Answer:

Hope it helps:)

Explanation:

Wavelength can be defined as the distance between two successive crests or troughs of a wave. It is measured in the direction of the wave. This means the longer the wavelength, lower the frequency. ...

To find the wavelength of a wave;

The wavelength is calculated from the wave speed and frequency by λ = wave speed/frequency, or λ = v / f.

The benefits of using radiation as a medical tool are:

The risks of using radiation as a medical tool are:

Yes, I do think the professionals in the medical field are currently use radiation in the best way possible as it is used in the treatment of cancer and there has been amazing result.

Yes, I do think radiation should be used as a tool in the medical field because it is one that is often used in medical imaging procedures to detect a lot of health issues and also for treatment of diseases.

Therefore, based on the above, the benefits and risk listed above are correct.

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There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the compound formed using element X and Z is X \(_O\)Z●.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. The compound formed using element X and Z  with their respective atoms is  X \(_O\)Z●. Atoms are written on the foot of the element.

Therefore, the compound formed using element X and Z is X \(_O\)Z●.

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Answer:

D

Explanation:

The most commonly used magnets are called permanent magnets. The statement that describes a property of magnet is that magnets attract or repel other magnets. The correct option is D.

An object which has the capacity to produce magnetic field and attract unlike poles and repels like poles is defined as the magnet. Whenever a magnet is suspended freely in air, it always points towards the north-south direction.

The pole pointing towards geographic north is known as the north pole and the pole pointing towards geographic south is called the south pole. The like poles repel while the unlike poles attract.

When two magnets are placed in such a way that their like poles facing each other, the lines of force are in opposite directions and hence like poles repel each other. The magnetic lines of force are in the same direction in unlike poles and they attract each other.

Thus the correct option is D.

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Answer:

Lithium will lose about 2 electrons

Making it a cation

Answer:

about three

Explanation:

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The equilibrium constant (Kp) for the reaction 2CH3OH(g)⇌2CO(g)+4H2(g) is 4.42×10^-5 at 298 K.

To calculate Kp for the second reaction, we can use the relationship between Kp and the stoichiometric coefficients of the balanced chemical equation. Since the second reaction is the reverse of the first reaction, we can use the reciprocal of the Kp value of the first reaction to find the Kp value for the second reaction.

Kp for the second reaction = 1/Kp for the first reaction
Kp for the second reaction = 1/2.26×10^4 = 4.42×10^-5

Therefore, the equilibrium constant (Kp) for the reaction 2CH3OH(g)⇌2CO(g)+4H2(g) is 4.42×10^-5 at 298 K.

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Answer:

D and A

Explanation:

While protons or electrons can be influenced by other charged particles, neutrons are not.

and

Neutrons are held tightly together with protons in the nucleus, so scientists could not observe the behavior of neutrons independently.

Answer:

research, experiments

The percent by mass of hydrogen in sodium hydroxide is 2.88%.

Sodium hydroxide is also known as lye or caustic soda. It is a white crystalline or colorless, odorless solid that is soluble in water and has a bitter taste. Sodium hydroxide has the chemical formula NaOH, and its molar mass is 40.00 g/mol. The compound contains sodium, oxygen, and hydrogen.In order to find the percent by mass of hydrogen in sodium hydroxide, we need to calculate the mass of hydrogen and the mass of sodium hydroxide. Then we divide the mass of hydrogen by the mass of sodium hydroxide and multiply by 100 to get the percentage.In one mole of sodium hydroxide, there is one mole of hydrogen, so the mass of hydrogen in one mole of sodium hydroxide is 1.008 g. The mass of one mole of sodium hydroxide is 40.00 g, which is the sum of the atomic masses of sodium, oxygen, and hydrogen.

Therefore, the percent by mass of hydrogen in sodium hydroxide is:

mass of hydrogen/mass of sodium hydroxide x 100% = 1.008 g/40.00 g x 100%

                                                                                         = 2.52%

However, this is the percent by mass of hydrogen in the chemical formula of sodium hydroxide, which is NaOH. In a real sample of sodium hydroxide, there may be impurities or water molecules, which would affect the mass of hydrogen and the mass of sodium hydroxide.

Therefore, the percent by mass of hydrogen in a real sample of sodium hydroxide would be slightly different from 2.52% The percent by mass of hydrogen in sodium hydroxide is 2.88%. The mass of hydrogen in one mole of sodium hydroxide is 1.008 g. The mass of one mole of sodium hydroxide is 40.00 g.

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A 50 L baby pool has a chlorine concentration of 0.200 M. If 20 L of water evaporated on a hot summer day, 3333 M is the final concentration of the pool.

Molarity is defined as the moles of a solute per litres of a solution.

Molarity is also known as the molar concentration of a solution.

A 50 L baby pool has a chlorine concentration of 0.200 M.

So, the volume of the baby pool is 50L with a concentration of 0.200 M.

\(V_1\)=50 L

\(M_1\)=0.200 M

If 20 L of water evaporated on a hot summer day, the volume of the baby pool will be 30L and we have to find the concentration of the baby pool after evaporation.

\(V_2\)=30 L

\(M_2\)=?

Apply the formula,

\(M_1V_1\)=\(M_2V_2\)

50 L X 0.200 M1 = 30 L X M2

\(M_2\) = 0.3333 M

Hence, 0.3333 M is the final concentration of the pool.

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Answer:

1 mole is equal to 1 moles Copper(II) Oxide, or 79.5454 grams. Note that rounding errors may occur, so always check the results.

Explanation:

The substance in the diagram that would have a net movement out of the cell is Water.

The substance that will have to have a net movement out of the cell would need to first be in the cell. The only substances in the cell are water, starch, and glucose.

Water will be the most likely substance to have a net movement out of the cell thanks to the process of osmosis which allows water molecules to move from an area of high concentration to an area of low concentration across a semi - permeable membrane. This happens until the concentration gradient is the same across the semi - permeable membrane.

The water in the cell is 90 % which means it is 5 % more than the 85 % water in the beaker. Water would therefore move out of the cell in a net movement until the concentration is the same in the beaker and the cell.

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For the subsequent reaction, 0.295 moles of bromine and 0.420 moles of chlorine gas are combined. The limiting reagent's formula is Br2. The most hydrochloric acid that may be produced is 67.56g.

Chemical element bromine has the symbol Br and atomic number 35. At room temperature, it is a flammable red-brown liquid that easily evaporates to form a similar-colored vapour for bromine. It is the third-lightest element in group 17 of the periodic table (halogens). An aqueous solution of hydrogen chloride is hydrochloric acid, often called muriatic acid. It is a colourless solution with an overpowering odour. Strong acid is how it is categorized is known as  hydrochloric acid.

A limiting reagent is a chemical that is only minimally present.

Br2 = 0.295/1 =0.295\sCl2 = 0.420/1 = 0.420

Br2 is therefore the limiting agent.

BrCl's mass is equal to its molecular mass multiplied by 1.

BrCl mass = 0.59*114.5.

BrCl has a mass of 67.56g.

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1. The absolute error is 128.76 g

2. The relative error is 0.99

3. The percentage error is 99%

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

Absolute error = |Accepted - Measured|

Absolute error = |130 - 1.24|

Absolute error = 128.76 g

Relative error = Absolute error / accepted value

Relaive error = 128.76 / 130

Relative error = 0.99

Percenrage error = relative error × 100

Percenrage error = 0.99 × 100

Percenrage error = 99%

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Answer:

Viruses

Explanation:

Like duh, they can have babies but like they rely on cells, which makes it that they aren't living. Since they are just like they need support and like cells don't like supporting viruses. Kind of like talking to a Chad so like just back off man.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 0.94 mL

density = 7.3 g/mL

We have

mass = 7.3 × 0.94 = 6.862

We have the final answer as

Hope this helps you

Answer:

Take about 2g barium hydroxide in a test tube. Add 1 g of ammonium chloride and mix with the help of a glass rod. Touch the bottom of the test tube with your palm. What do you feel? Is this an exothermic or endothermic reaction?

Okay, let's solve this step-by-step without using quadratics:

1) The equilibrium constant Kc = 0.36 means the equilibrium lies to the left. So there will be more N2O4 than NO2 at equilibrium.

2) The initial concentration of N2O4 is 0.1 mol dm^-3. Let's call this [N2O4]initial.

3) At equilibrium, the concentrations of N2O4 and NO2 will be [N2O4]equil and [NO2]equil respectively.

4) We know the equilibrium constant expression for this reaction is:

Kc = ([NO2]equil)^2 / [N2O4]equil

5) Setting this equal to 0.36 and plugging in 0.1 for [N2O4]initial, we get:

0.36 = ([NO2]equil)^2 / (0.1 - [NO2]equil)

6) Simplifying, we get:

0.036 = [NO2]equil^2

7) Taking the square root of both sides, we get:

[NO2]equil = 0.06 mol dm^-3

So the equilibrium concentration of NO2 is 0.06 mol dm^-3.

Let me know if you have any other questions! I can also provide a more step-by-step explanation if needed.

Answer:

The periodic table, in full periodic table of the elements, in chemistry, the organized array of all the chemical elements in order of increasing atomic number—i.e., the total number of protons in the atomic nucleus. When the chemical elements are thus arranged, there is a recurring pattern called the “periodic law” in their properties, in which elements in the same column (group) have similar properties. The initial discovery, which was made by Dmitry I. Mendeleyev in the mid-19th century, has been of inestimable value in the development of chemistry.

It was not actually recognized until the second decade of the 20th century that the order of elements in the periodic system is that of their atomic numbers, the integers of which are equal to the positive electrical charges of the atomic nuclei expressed in electronic units. In subsequent years great progress was made in explaining the periodic law in terms of the electronic structure of atoms and molecules. This clarification has increased the value of the law, which is used as much today as it was at the beginning of the 20th century, when it expressed the only known relationship among the elements.

Explanation:

is a table of the chemical elements arraged in order of atomic number

Answer:

C

Explanation:

Answer:

C

Explanation:

Balanced equations have the same number of atoms of each element on both sides of the equation (right and left side of the arrow).

First count the number of atoms of each element of the original equation.

CO(g) + O₂(g) ⟶ CO₂(g)

RHS: 1C, 3O

LHS: 1C, 2O

Balancing the O atoms,

2CO(g) + O₂(g) ⟶ 2CO₂(g)

LHS: 2C, 4O

RHS: 2C, 4O

Thus, the equation is balanced.

*General rule: balance O and H atoms last (in this case C atoms were initially balanced)

LHS= left- hand side

RHS= right- hand side

A) Incorrect as there are 3 O atoms on the LHS and only 2 O atoms on the RHS.

B) Incorrect as there is 1 C atom on the LHS and 2 C atoms on the RHS. Also, on the LHS there is 3 O atoms while there is 4 O atoms on the RHS.

D) Incorrect.

LHS: 2C, 6O

RHS: 2C, 4O