Compounds are _____substances.

neutral
charged
ionized
non-neutral

Answer:

0.11866M

Explanation:

molarity is mol/L

0.267 mol/2.25L = 0.1186666...

round depending on how many digits you need

The question is incomplete. The complete question is:

15L tank of gas is contained at a high pressure of [tex]8.20\times 10^4 torr[/tex]. The tank is opened and the gas expands into an empty chamber with a volume of [tex]6\times 10^4 L. What is the final pressure if the temperature remains constant.

Answer: 20.5 torr

Explanation:

To calculate the new pressure, we use the equation given by Boyle's law. This law states that pressure is directly proportional to the volume of the gas at constant temperature.

The equation given by this law is:

[tex]P_1V_1=P_2V_2[/tex]

where,

[tex]P_1\text{ and }V_1[/tex] are initial pressure and volume.

[tex]P_2\text{ and }V_2[/tex] are final pressure and volume.

We are given:

[tex]P_1=8.20\times 10^4torr\\V_1=15L\\P_2=?\\V_2=6\times 10^4L[/tex]

Putting values in above equation, we get:

[tex]8.20\times 10^4\times 15L=P_2\times 6\times 10^4L\\\\P_2=20.5torr[/tex]

Thus new pressure will be [tex]20.5torr[/tex]

Answer:

Weigh 80g of Sodium chloride and dissolve it in 100ml of water.

Explanation:

The formula for weight percent (w/v) is: [Mass of solute (g) / Volume of solution (ml)] x 100. This is used to prepare a solution of a solid in a liquid.

To prepare 80% solution of sodium chloride in water, 80g of sodium chloride is dissolved in 100ml of water according to the formula above. 80g of sodium chloride is measured in an appropriate weighing balance and carefully transferred to a standard flask and made up to the 100ml mark.

Answer:

C^6 H^1206, 602,6002, 6H ^20, 2799 AHkJ, 100g C^6 H^1206

Explanation:

Answer:

83.60oC per cal

Explanation:

The amount of heat required to raise the temperature of 57.8g of silver from 17.0°C to 43.5°C is 87.31 calories.

The energy required to raise the temperature of a substance can be calculated using the following formula:

Q = m × c × ∆T

Where;

Q = 57.8 × 0.057 × (43.5 - 17)

Q = 87.31calories

Therefore, the amount of heat required to raise the temperature of 57.8g of silver from 17.0°C to 43.5°C is 87.31 calories.

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Answer:

0.143L

Explanation:

Molar mass of H2SO4 = 98g/Mol

No of mole = mass/molar mass

No of mole= 49/98 = 0.5 mol

No of mol = concentration × volume

Volume = n/C = 0.5/3.5 = 0.143L

76.6 litres is the volume of the gas if pressure and temperature changes to STP.

Explanation:

Data given:

Volume of the gas V1 = 15.9 litres

pressure of the gas P1 = 589 kPa or 5.81 atm.

temperature T1 = 56.5 degrees or 329.3 K

Final pressure P2 = 101.3 kPa

Final temperature T2 = 273 K

At STP the pressure is 1 atm or 101.3 kPa and the temperature is 273 K. So from the question the final temperature and pressure is at STP.

from Gas Law:

[tex]\frac{P1V1}{T1}[/tex]  =  [tex]\frac{P2V2}{T2}[/tex]

V2 = [tex]\frac{P1V1T2}{P2T1}[/tex]

Putting the values in  the above rearranged equation of Gas Law:

V2 = [tex]\frac{589 X 15.9 X 273}{329.3X 101.3}[/tex]

    = 76.6 Litres

If the pressure and temperature change to STP, the new volume will be "76.6 liters".

According to the question,

Initial pressure, P₁ = 589 kPa or,

                              = 5.81 atm

Final pressure, P₂ = 101.3 kPa

Initial volume, V₁ = 15.9 L

Initial temperature, T₁ = 56.5° or,

                                    = 329.3 K

Final temperature, T₂ = 273 K

By using the Gas law,

→ [tex]\frac{P_1 V_1}{T_1} =\frac{P_2 V_2}{T_2}[/tex]

or, the new volume be:

→ V₂ = [tex]\frac{589\times 15.9\times 273}{329.3\times 101.3}[/tex]

       = 76.6 L

Thus the above approach is correct.

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Answer:

A. the atomic number

Explanation:

It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth.

Answer: 14.625g

Explanation:

No of moles= mass given/molar mass

No of moles given= 0.375mol

Mass is the unknown (?)

Molar mass of K= 39

No of moles = mass given/molar mass

Substitute the values

0.375= mass/39

Cross multiply

Mass = 39×0.375

Mass= 14.625g

The mass is 14.625g

Answer:

14.625g

Explanation:

Mass of a substance =number of moles of the substance × molar mass of the substance

Substance of interest is potassium, K

Given, Number of moles of K =0.375mol

Molar mass of K =39g/mol

Therefore, mass of K =0.375×39=14.625g

Final answer:

The male reproductive cell is known as a sperm, and the female counterpart is an egg. They are both gametes, which are haploid cells vital for sexual reproduction. During fertilization, these cells combine to form a diploid cell called a zygote, initiating embryo development.

Explanation:

The male reproductive cell is called a sperm. The female reproductive cell is called an egg. When the male and female reproductive cells join during fertilization, a zygote forms.

Sexual reproduction involves the union of a male and a female gamete. Gametes are haploid cells, each carrying 23 chromosomes—half the number found in other body cells. The process of gametogenesis includes spermatogenesis and oogenesis, where sperm and eggs are produced respectively. In males, this occurs in the testes, often highlighted in figures on the male reproductive system, such as the one labeled Figure 27.2. During spermatogenesis, sperm acquire a tail and the ability to swim, essential for reaching the female gamete. The female counterpart, oogenesis, results in a single large egg from the initially formed four haploid cells.

Upon fertilization, a sperm cell and an egg cell unite to form a zygote, a diploid cell that contains a complete set of chromosomes, one set from each parent. This diploid cell marks the start of a new organism and it divides by mitosis as it travels to the uterus, eventually developing into an embryo.

Answer:

Explanation:

MnO₄⁻ + 5 Fe2⁺ + 8H⁺ = Mn⁺² + 5Fe⁺³ + 4H₂O.

- d [MnO₄⁻ ] / dt = 4 x 10² mol /L.s.

- [ Fe²⁺ ] / dt = 5 x - d [MnO₄⁻ ] / dt

= 5 x 4 x 10² mol /L.s.

20 x 10²

- d [ H⁺] / dt = 8 x - d [MnO₄⁻ ] / dt

= 8 x  4 x 10²

= 32 x 10² mol /L.s.

+d [ Mn⁺² ] / dt = - d [MnO₄⁻ ] / dt

= 4 x 10² mol /L.s

+d [ Fe⁺³ ] / dt = 5 x - d [MnO₄⁻ ] / dt

= 20 x 10² mol /L.s

I think the answer is direct

Answer: New Moon

Explanation: I Tried it on study island

Answer:

Answer: New Moon

Explanation:

Answer:

601.8mL

Explanation:

First, we'll begin by obtaining an equation connecting volume and number of mole together. This is illustrated below:

From the ideal gas equation:

PV = nRT

Divide both side by P

V = nRT/P

Now divide both side by n

V/n = RT/P

Under the same conditions simply means temperature(T), pressure (P) and the gas constant (R) are all constant i.e

RT/P => constant

Therefore, the above equation can be written as:

V1/n1 = V2/n2

Now we can solve for the final volume otherwise known as the new volume as follow:

Data obtained from the question include:

n1 (initial mole) = 0.214 mol

V1 (initial volume) = 343.4 mL

n2 (final mole) = 0.375 mol

V2 (final volume) =?

Applying the the equation V1/n1 = V2/n2, the final volume is obtain as illustrated below:

V1/n1 = V2/n2

343.4/0.214 = V2/0.375

Cross multiply to express in linear form

0.214 x V2 = 343.4 x 0.375

Divide both side by 0.214

V2 = (343.4 x 0.375)/0.214

V2 = 601.8mL

Therefore, 0.375 mol of argon gas will occupy 601.8mL under the same condition.

Answer:

D not c

Explanation:

The point showing the laser being absorbed is D.

LASER stands for “Light Amplification by Stimulated Emission of Radiation”

Lasers not only increase the intensity of light but also generate light. Lasers emit light by stimulated emission of radiation, which increases the intensity of radiation. Some lasers produce visible light, and some produce ultraviolet or infrared rays.

The laser light exhibits some peculiar properties compared with the conventional light which make it unique.

Therefore, The point showing the laser being absorbed is D.

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Answer:

0.29 molL-1 or 0.29 M

Explanation:

Now we have to use the formula

n=CV

Where

n= number of moles = 0.87 moles

C= concentration of the solution (the unknown)

V= volume of the solution = 3.00L

Now having specified all parameters except the unknown (molarity if the sodium chloride solution) we can now proceed to find it.

C= n/V

C= 0.87mol/3.00L

C= 0.29 molL-1

Answer:

0.29 mol/L

Explanation:

When sodium chloride (NaCl) is dissolved in water, it will dissociates to produce sodium ion (Na+) and chloride ion (Cl-) in solution as shown below:

NaCl —> Na+ + Cl-

Next, let us calculate the molarity of NaCl. This is illustrated below:

Mole of NaCl = 0.87 mole

Volume of solution = 3 L

Molarity =?

Molarity = mole of solute /Volume

Molarity = 0.87mole /3L

Molarity = 0.29 mol/L

Therefore, the molarity of NaCl is 0.29 mol/L

Answer: im pretty sure its D

Explanation:

According to intermolecular forces of attraction, statement which best describes what happens to water during vaporization is 'B'.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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16.4 grams is the mass of solute in a 500 mL solution of 0.200 M .

sodium phosphate

Explanation:

Given data about sodium phosphate

atomic mass of Na3PO4 = 164 grams/mole

volume of the solution = 500 ml or 0.5 litres

molarity of sodium phosphate solution = 0.200 M

The formula for molarity will be used here to know the mass dissolved in the given volume of the solution:

The formula is

molarity = [tex]\frac{number of moles of solute}{volume in litres}[/tex]

    putting the values in the equation, we get

molarity x volume = number of moles

0.200 X 0.5= number of  moles

number of moles = 0.1 moles

Atomic mass x number of moles = mass

putting the values in the above equation

164 x 0.1 = 16.4 grams

16.4 grams of sodium phosphate is present in 0.5 L of the solution to make a 0.2 M solution.

The mass of solute in 500mL solution is 16.4 grams. The number of moles can be calculated by using Molarity formula to find Mass of the solute.

Given:

Atomic mass of Na3PO4 = 164 grams/mole

Volume of the solution = 500 ml or 0.5 litres

Molarity of sodium phosphate solution = 0.200 M

The formula for molarity will be used here to know the mass dissolved in the given volume of the solution:

Molarity = Number of solute / Volume of solution

Molarity * volume = number of moles

0.200 * 0.5= number of  moles

Number of moles = 0.1 moles

Mass= Atomic mass * number of moles

On subsituting:

164 * 0.1 = 16.4 grams

16.4 grams of sodium phosphate is present in 0.5 L of the solution to make a 0.2 M solution.

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Answer:

Work = 5595.31J

Explanation:

Mass = 300.5kg

Distance (h) = 1.9m

Acceleration due to gravity (g) = 9.8m/s²

Work done on an object is the product of the force applied over the distance the object is moved.

Work = force * distance

Force = mass * acceleration (a or g)

F = m* g

F = 300.5 * 9.8

F = 2944.9N

Workdone = force *distance

Work = 2944.9 * 1.9

Work = 5595.31J

The work done is 5595.31J

Answer:

i think it is because of surface tension

Explanation:

Answer:

sample response - Surface tension is the result of water molecules pulling inward with a strong attractive force. This attractive force brings the molecules on the surface of the water close together and causes the surface of the water to be drawn toward the water molecules beneath the surface. Since there are no water molecules above the surface, there are uneven forces. This causes surface tension, allowing the coin to float on the water’s surface.

Explanation:

ywww :) from edg.

Answer:

47 grams CoCl needed.

Explanation:

1 mole weight of CoCl in 1 Liter solution => 1.0 molar solution

∴ 1/2 mole weight of CoCl in 1/2 Liter solution => 1.0 molar solution.

1/2 mole weight of CoCl = 1/2(94 g/mole) = 47 grams CoCl needed.  

Final answer:

To make a 1.0 molar solution of CoCl₂ in half a liter of water, you would need 64.915 grams of CoCl₂, using its molar mass of 129.83 g/mol.

Explanation:

The question you are asking is about making a 1.0 molar solution of cobalt(II) chloride, CoCl₂, in 1/2 liter of water. To calculate the amount of CoCl₂ required, we will use the formula:

mass (grams) = molarity (mol/L) × volume (L) × molar mass (g/mol).

First, we need to establish the molar mass of CoCl₂. Cobalt has an atomic mass of about 58.93 g/mol, and each chlorine has an atomic mass of about 35.45 g/mol. So, the molar mass of CoCl₂ is:

58.93 g/mol (for Co) + 2 × 35.45 g/mol (for Cl) = 129.83 g/mol.

Now, we can calculate the required mass of CoCl₂ for a 1.0 M solution:

mass = 1.0 mol/L × 0.5 L × 129.83 g/mol = 64.915 grams.

Therefore, you would need 64.915 grams of CoCl₂ to make a 1.0 molar solution in half a liter of water.

Answer:

heat content

Explanation:

the kinetic energy , distance between molecules, and potential energy are all depending on the substance

Answer:

Na20

Explanation:

I did a quick google search and it was right there lol

Answer:

It would be Na20 please mark brainliest have a nice day

Answer:

V₂ =19.30 L

Explanation:

Given data:

Initial volume of gas = 29.3 L

Initial temperature = standard = 273 K

Initial pressure = standard = 1 atm

Final volume = ?

Final temperature = -23°C (-23+273 =250 K)

Final pressure = 1.39 atm

Solution:

Formula:  

P₁V₁/T₁ = P₂V₂/T₂  

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Solution:

V₂ = P₁V₁ T₂/ T₁ P₂  

V₂ = 1 atm × 29.3 L × 250 K / 273 K × 1.39 atm

V₂ = 7325 atm.L.K / 379.47 K.atm

V₂ =19.30 L

Answer: There would have to be three nitrogen atoms in the products. The law of conservation of matter states that the amount of substance before a reaction occurs  should be the same as the amount of substance after the reaction.

Explanation: This is the EXACT sample answer from the test, just reword it if you want. ^

According to the law of conservation of mass, Marcia can conclude that reaction started with 3 nitrogen atoms as mass of reactants and products are equal  as per the law of conservation of mass.

According to law of conservation of mass, it is evident that mass can neither created nor destroyed rather it  can be restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional to each other which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

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Answer:

0.62 L

Explanation:

Step 1:

Data obtained from the question.

Initial Volume (V1) = 1.80 L

Initial pressure (P1) = 785 mmHg

Final pressure (P2) = 3.00 atm

Final volume (V2) =?

Step 2:

Conversion of the pressure in mmHg to atm.

It is important to express the initial and the final pressure in the same unit. Either express both in atm or in mmHg. What ever the case is, we'll still arrive at same answer. Here, we shall be converting from mmHg to atm. This is illustrated below:

760mmHg = 1atm

Therefore, 785 mmHg = 785/760 = 1.03 atm

Step 3:

Determination of the final volume. This is illustrated below.

We shall be applying the Boyle's law equation since the temperature is constant.

P1V1 = P2V2

Initial Volume (V1) = 1.80 L

Initial pressure (P1) = 1.03 atm

Final pressure (P2) = 3.00 atm

Final volume (V2) =?

P1V1 = P2V2

1.03 x 1.8 = 3 x V2

Divide both side by 3

V2 = (1.03 x 1.8) /3

V2 = 0.62 L

Therefore, the new volume of the balloon is 0.62 L

Answer:

The volume of the balloon up there will be 0.618 L

Explanation:

Given:

V₁ = 1.8 L

P₁ = 785 mmHg = 1.03 atm

P₂ = 3 atm

Question: What would the volume of the balloon up there, V₂ = ?

According the ideal gas law:

PV = nRT

However, in this case, the number of moles of helium balloon is constant. The temperature will also be assumed to be constant. Therefore, the expression of the ideal gases is as follows:

P₁V₁ = P₂V₂

Solving for V₂

[tex]V_{2} =\frac{P_{1}V_{1} }{P_{2} } =\frac{1.03*1.8}{3} =0.618L[/tex]

Answer:

The elements which have similar behavior are Barium, strontium and beryllium.

The elements that have similar behavior are Barium, strontium, and beryllium. The correct options are A, D, and F.

Chemical elements are substances present in the periodic table. There are 118 elements in the periodic table. All elements are arranged according to the atomic numbers of the elements.

Barium, strontium, and beryllium belong to the same group of the periodic table. They are called alkaline earth metals. They are very reactive at room temperature. These metals are all white, silvery, and shiny metals.

Alkaline earth metals have two electrons in their outer shell. Which gives them the same oxidation number, which is 2+. Alkaline earth metals have beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

Thus, the correct options are A, Barium, D, Strontium, and F, Beryllium.

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