Select the correct answer from each drop-down menu. To prepare a 2 M solution of potassium nitrate (KNO3), which quantities must be measured? The mass of the and the volume of the must be measured.

nswer: 959.67 K or 686.67 C

Explanation:

Entropy of Vaporization (S) = Heat of Vaporization (H) / T ( boiling point) (in Kelvin)

1.) Flip the equation to have T as the product --> T = H/S

2.) We need to change H from kJ to J --> 69.0 kJ/mol --> 69000J/mol

3.) Substitute numbers in the equation --> (69000 kJ/mol) / (71.9 J/Kmol) = T

4.) T = 959.67 K or in Celcius --> 959.67 - 273 = 686.67 C

Answer:

i already commented it but i want points anyways its 80 because 20x4 = 80. it said one gram equals 4 calories and there is 20 grams so basically 4+4+4+4+4+4+4+4+4+4+4+4+4+4+4+4+4+4+4+4

20 grams at 4 calories per gram.

20*4=80 Calories.

in the end, A is your answer

Answer:

ACTUALLY the correct answer is

helium

Answer:

20.1

Explanation:

li/LiOH×100/1

6/6+16+1×100/1

6/23=20.1%

Amphetamine was developed initially as a substitute for a closely-related chemical derived from the Chinese herb ma huang. That chemical is Ephedrine.

Ephedrine is a stimulant medication that can be considered an amine chemical compound and substituted amphetamine.

Ephedrine is used in sports to stimulate the central nervous system (C_NS) and as energy supplier.  

Ep_hedrine use is prohibited and chronic usage of this substance may have problems the health.

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Answer:

Pangaea

Explanation:

The concentration of the NaOH in the solution will be 0.5 mol/L

The concentration is defined as the amount of a particular chemical present in the mixture.

Now the given chemical reaction is:

2NaOH + H₂SO₄ = Na₂SO₄ + 2H₂O

The volume of (H₂SO₄)=0.25 L

The concentration of (H₂SO₄)=2.00 mol/L

The volume of (NaOH)=2.00 L

Now the concentration will be calculated as:

[tex]c(NaOH)= \dfrac{2c(H_2SO_4)}{v(NaOH)}[/tex]

[tex]c(NaOH)=\dfrac{2\times2\times 0.25}{2} =0.5\ \frac{mole}{L}[/tex]

Hence, the concentration of a solution of NaOH is 0.5 mol/L

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Answer:

C. 0.50 M

Explanation:

Correct on Edge 2022!!!

Good luck everyone, you got this! Have a great day!

Answer:

mass number

Explanation:

yeah mass number is the total of protons and neutrons

for example carbon has 12 proton and 12 neutrons therefore it's mass number is 24

i hope this is what you're looking for

Answer:

Energy is carried from one point to another or from one region to another by moving mass or through the action of waves.

· All waves have a source.  This source transforms energy into forms that can be carried as waves.

· Waves are not material objects.  Waves represent the moving energy being carried away from the source.

Waves are coordinated vibrations that transport energy.  Sometimes waves require the vibration of particles in matter to move, other waves travel without any need for particle vibrations.

Explanation:

Wave energy requires no motion for its movement whereas matter energy requires motion. Wave energy travels in electromagnetic spectrum whereas this is not applicable to matter energy.

Wave energy is obtained from the water currents in the ocean and seas. The energy so harnessed is a renewable form of energy.

Wave energy is important as it provides enormous energy harvest. Waves have the high potential to generate energy on a mass scale. This energy can be utilized for energy production, water desalination etc. Special wave energy converters are available for this purpose.

Wave energy will reduce the dependence on fossils for energy. It can be considered as a reliable source to obtain energy using wave power. However, it is an expensive way and also requires high maintenance.

Wave energy is also weather dependent. As disturbances in the weather affect the energy production.

Thus, waves can be considered as an important source of renewable energy on earth.

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Answer:

0.150g x 1mol/Molar mass of Cu3S = moles

Explanation:

0.150g x 1 mol/222.70= 0.0006735519 moles

*pls like

The electrons can jump shells by releasing/gaining energy. If an atom develops a positive charge, how could it have happened? It couldn't possibly have taken on additional protons because protons and neutrons are bound by the strong nuclear force, which keeps the nucleus stable.

Answer:

We have a chemist who collects 59 ml of S. 0. 2 at the pressure atmospheric pressure. Also, this one is considered as proven. We one and this one is pretty even so this is 0.989 atmospheres. Now is the second day the pressure atmospheric pressure was 0.967 atmospheres. Then what is the pressure of sulfur dioxide in the flask? Oh, so if you see here, we know that the one we want is equal to P two. We do so from the ideas equation. So this one is equal to what we want we do so we do is equal to P one. We want we do. Then it is equal to P one is 59 B one and B one is 0.989 and debated by 0.967 atmospheres. So this one is atmospheres and atmospheres and this one is Ml. So here the 0.967 atmospheric pressure is 60.34 ML approximating so this is the pressure of the gas at 0.967 on the second day.

Brainliest pls!!!

The concept Boyle's law is used here to determine the new volume of sulphur dioxide. Boyle’s law was put forward by the Anglo-Irish chemist Robert Boyle in the year 1662. Here the new volume is 60.34 mL.

A gas law known as Boyle's law asserts that a gas's pressure is inversely proportional to its volume when it is held at a fixed temperature and of a given mass. To put it another way, as long as the temperature and volume of the gas remain constant, the pressure and volume of the gas are inversely proportional to one another.

For a gas, the relationship between volume and pressure (at constant mass and temperature) can be expressed mathematically as follows.

P = k*(1/V) ⇒ PV = k

For two different gases, the equation is:

P₁V₁ = P₂V₂

V₂ = P₁V₁ / P₂

0.989 × 59.0 / 0.967 = 60.34 mL

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The two examples which are possible environmental impacts of flooding include:

Flooding can be defined as a geological process that typically involves the covering of earthen (soil) materials and the transportation of these materials by a natural force such as a large amount of water.

This ultimately implies that, flooding causes and has several environmental impacts on the physical environment due to the submergence of a dry land by a large amount of water, and these include the following:

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Answer:

The two examples which are possible environmental impacts of flooding include:

1. Groundwater recharge.

2. Pollution of water supply.

Explanation:

Answer:

Potassium chloride, KCl , is an ionic compound formed by the electrostatic force of attraction that holds the potassium cations and the chlorine anions together. Potassium, K , is located in group 1 of the Periodic Table.

Explanation:

thanks

Answer:

c.1.5 moles of cu Will contain a total of 9.0 * 10 ^ 23 ATOMS.

To convert moles into atoms they molar amount and number of atom is múltiples by avagadro's number.

Answer:

Explanation:

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

[tex]volume = \frac{mass}{density} \\[/tex]

From the question

mass = 12.5 g

density = 7.87 g/cm³

We have

[tex]volume = \frac{12.5}{7.87} \\ = 1.588310038...[/tex]

We have the final answer as

Hope this helps you

Answer: its D. At point 4, thermal energy from warm air over the land is transferred upward toward cooler areas of the atmosphere

Explanation:

Answer:

Oxygen

Explanation:

Aerobic respiration specifically requires oxygen, but anaerobic respiration does not.

Answer:

Well, the mass of the products is equal to the mass of the reactants.

Explanation:

The law of conservation of mass states that,

For any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system's mass cannot change, so quantity cannot be added nor removed.

Taken from here.

Suppose we have the balanced equation of combustion of hydrogen to form water.

The equation will be:

2H2(g)+O2(g)→2H2O(g)

Now, we look at the total mass of the reactants and compare it with the mass of the products.

H2 has a mass of 1⋅2 amu, and so 2H2 will have a mass of 2⋅2=4 amu.

O2 has a mass of 16⋅2=32 amu.

So, the total mass of the reactants (2H2+O2) is equal to 4+32=36 amu.

Now, let's take a look at the mass of the products.

Water has a chemical formula of H2O.

In here, there are two hydrogen atoms and one oxygen atom, and so its mass will be 2+16=18 amu.

There are two water molecules formed, and that means the total mass of the products is 18⋅2=36 amu.

As you can see now, the mass of the products is equal to the total mass of the reactants together, and the chemical equation obeys the law of conservation of mass.

Note that this applies to every balanced chemical equation.

The new concentration of the solution is 0.016 M

From the question, we are to determine the concentration of the new solution prepared from question 4.

NOTE: Question is provided below

From question 4, the concentration of the sodium chloride solution is 0.200M

Now, to determine the new concentration,

Using the dilution law

C₁V₁ = C₂V₂

Where

C₁ is the initial concentration

V₁ is the initial volume

C₂ if the final concentration

and V₂ is the final volume

Then,

C₁ = 0.200 M

V₁ = 10.00 mL
C₂ = ?

V₂ = 125.00 mL

Then,

0.200 × 10.00 = C₂ × 125.00

[tex]C_{2}= \frac{0.200 \times 10}{125.00}[/tex]

C₂ = 0.016 M

Hence, the new concentration of the solution is 0.016 M

Question 4:

Calculate the amount of solid sodium chloride needed to make 200.00 mL of a 0.200 M solution

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Answer:

The wavelength of wave is 1.2×10³ m.

Explanation:

Given data:

Frequency of wave = 250,000 Hz

wavelength of wave = ?

Solution:

Formula:

Speed of light = wavelength × frequency

c = λ × f

λ = c/f

speed of light =  3×10⁸ m/s

Wavelength is designated as "λ" and it is the measured in meter. It is the distance between the two crust of two trough.

λ = 3×10⁸ m/s  / 250,000 Hz

Hz = s⁻¹

λ = 1.2×10³ m

The wavelength of wave is  1.2×10³ m.

The event which most likely occurs at point V during a rock cycle is cooling.

Point V is present in the rock cycle, where changes in the state or nature of rock takes place.

When mangma comes towards the surface of the earth then due to change in temperature and pressure it will concerts into the igneous rock by cooling process and coverts into the harder form.

Hence at point V, colling is occur.

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Answer:

A. cooling

Explanation:

edge 22'

Answer:

5.68

Explanation:

just divide. hope this helps!

Answer: All ionic compounds are electrolytes. When ionic compounds dissolve, they break apart into ions which are then able to conduct a current ( conductivity ).

Explanation:

Answer:

B

Explanation:

the size of the individual molecules.