Calculate the average atomic mass for argon if its abundance in nature is 7.0% argon-39, 92.5% argon-40, and 0.5% argon-41. Show your work

Answer:

a

the molar mass of the substance

Answer: a

The molar mass of the substance

Explanation:

Answer:

Solid = rocks or other hard stuff

Liquid = water or mild or other stuff likt that

Answer:Ice is an example of a solid. A liquid has a defined volume, but can change its shape. Water is an example of a liquid. A gas lacks either a defined shape or volume.

...

Examples of gases include:

Air.

Natural gas.

Hydrogen.

Carbon dioxide.

Water vapor.

Freon.

Ozone.

Nitrogen.

Explanation:

A redox reaction's hydroxide ion component involving oxidation or reduction is referred to as a half reaction. By taking into account, we get a half reaction.

The diatomic anion OH, which is made up of oxygen and hydrogen atoms, is most frequently referred to in chemistry as hydroxide. It is among the known simplest diatomic ions. The group of substances that contain the hydroxide ion is referred to as "hydroxide" as well.

Galvanic cell with Zn and Cu as an example. CuSO4(aq) Zn(s) + CuSO4(aq) (s) Oxidation occurs at the Zn anode (the metal loses electrons). This can be seen in the oxidation half-reaction shown below (see how the electrons are on the products side): Zn(s) equals Zn2+ + 2e.

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With the characteristics of the states of matter and the transformation processes, it is possible to find the result for the description of the water cycle:

The water cycle or hydrological cycle are all the changes that water has in a closed cycle.

The water in the liquid state is heated by the sun, which causes a part of the water to transform into gas through the evaporation process, these gas particles are very small therefore the pressure of the air makes them rise, as they rise through the atmosphere the temperature drops, therefore with the condensation process they pass to the liquid state.

The small drops of the atmosphere are joining them until their weight makes them fall towards the earth due to the rain process if the temperature is intermediate, if the temperature is extremely low the drops can pass to the solid state through the process of solidification falling as snow and ice.

When it is liquid water and it is soldered on the land, it can have a process of infiltration in the land and rocks called runoff and reach either the seas or underground levels where it is stored.

We can see that in this water  is not lost only, it is transformed from one state to another, but the total amount of water remains constant.

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The adjustment that would increase the speed of the 300 light particles is keeping the pressure constant and increasing the temperature.

Temperature is defined as the average kinetic energy of the molecules of a substance. The molecules of a substance are the particles referred to here.

When the temperature of a substance is increased, the speed of the particles in the container increases accordingly.

Hence, for the 300 light particles in an airtight container, the increase in the speed of the particles is achieved by keeping the pressure constant and increasing the temperature .

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The oxidation number of nitrogen in nitric acid, HNO₃, is +5.

In nitric acid (HNO₃), the hydrogen atoms (H) have an oxidation number of +1, and the oxygen atoms (O) have an oxidation number of -2. Since the compound is neutral, the sum of the oxidation numbers must be zero.

Let x be the oxidation number of nitrogen (N). Considering the oxidation numbers of hydrogen and oxygen, the equation becomes:

(+1) + x + (-2) + (-2) + (-2) = 0

Simplifying the equation:

x - 5 = 0

x = 5

Therefore, the oxidation number is +5. Nitric acid is an example of a compound where nitrogen exhibits its highest common oxidation state (+5) due to its electronegativity and tendency to gain electrons from other elements.

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Answer:

D)

Explanation:

CH4 + 2O2 = CO2 + 2H2O

1 (L CO2)= 32.5(L CO2)

1 (CH4) = 32.5 (L CH4)

Answer:

C. Rock, dust, and ice.

Explanation:

Comets are frozen leftovers from the formation of the solar system composed of dust, rock, and ices.

The 0.022 L is the concentration of the sodium hydroxide solution.

What is concentration ?

Concentration is the amount of a substance in a certain region. Another definition of concentration is the ratio of a solution's solute to its complete solution or solvent. Concentration is commonly expressed in terms of mass per unit volume. A solution concentration is a measurement of how much solute has dissolved in a certain quantity of solvent or solution.

What is titration?

Titration is a chemical analysis procedure that determines the amount of a given ingredient in a sample by adding an exact known quantity of a separate substance that the desired element interacts with in a precise, known proportion to the measured sample. Titration is an important method in analytical chemistry that is also known as volumetric analysis.

The titration reaction is given by  

HCl (aq) + NaoH (aq) ---> NaCl =H2O

Conc  of HCl (aq) = 0.235 mol/ L  

V of HCl (aq) = 10 ml = 0.01L

No. Of moles HCL = C x V  

                             = 0.2351 x 0.01

                            = 2.35 x 10-3 mole

For NaoH  

Volume of NaoH  = 23.08 - 1.06

                               = 22.02 mL = 0.02202L  

                               = 0.022 L

No. Of moles will be some as of HCl due to titration (1:1 ratio )

So n of NaoH = 2.35 x 10-3 mole

CNaoH = n/V = 2.35 x 10-3 mole / 0.02202 l = 0.106721162 mole/ L

CNaOH  = 1.06721162 x 10-1 mole/ L

Therefore, 0.022 L is the concentration of the sodium hydroxide solution.

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The reaction of carbon (C) with water (H2O) produces hydrogen gas (H2) and carbon monoxide (CO). Since the question specifies that carbon (C) is in excess, we can assume that all of it will react.

First, we need to calculate the number of moles of carbon (C). We know that 20.1 g of carbon (C) is given, and the molar mass of carbon (C) is 12.01 g/mol. Therefore, the number of moles of carbon (C) is 20.1 g / 12.01 g/mol = 1.67 mol.

Next, we can use the balanced chemical equation to determine the mole ratio between carbon (C) and hydrogen gas (H2). From the equation, we can see that 1 mole of carbon (C) produces 1 mole of hydrogen gas (H2).

So, 1.67 mol of carbon (C) will produce 1.67 mol of hydrogen gas (H2).

Finally, we can use the ideal gas law to calculate the volume of hydrogen gas (H2) at the given temperature and pressure. The ideal gas law equation is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

Since the pressure is given as 1.00 atm and the temperature is given as 327 K, we can substitute these values into the equation along with the number of moles of hydrogen gas (H2) calculated earlier.

PV = nRT
V = (1.67 mol)(0.0821 L·atm/(mol·K))(327 K) / 1.00 atm

Calculating this gives us the volume of hydrogen gas (H2) formed.

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Answer:

the answer is true

Explanation:

I hope so it is helpful to u

Answer:

Water(H20)

Explanation:

Water is called the universal solvent because more substances dissolve in water than in any other chemical. This has to do with the polarity of each water molecule. The hydrogen side of each water (H2O) molecule carries a slight positive electric charge, while the oxygen side carries a slight negative electric charge.

To calculate the volume of ethyl alcohol that evaporated, we need to know the volume of ethyl alcohol that was present initially, the volume of ethyl alcohol after the evaporation, and the molar mass of ethyl alcohol.

Let's assume that the initial volume of ethyl alcohol is V_0 mL and the final volume is V_f mL. The volume of ethyl alcohol that evaporated is then V_e = V_0 - V_f mL.

We can use the ideal gas law to relate the volume of a gas to the number of moles of the gas present. The ideal gas law is given by:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.

Since the volume of a gas is directly proportional to the number of moles of the gas, we can write:

V/n = k

where k is a proportionality constant.

If we know the value of k for a given gas at a particular temperature and pressure, we can use this relationship to calculate the number of moles of the gas present.

In this case, we are told that 1 mole of any gas at STP (standard temperature and pressure) occupies a volume of 22.4 L, which is equivalent to 22,400 mL. Therefore, the value of k for any gas at STP is 22,400 mL/mol.

We can use this value of k to calculate the number of moles of ethyl alcohol that evaporated:

n = V_e/(22,400 mL/mol)

Substituting in the known values for V_e and k, we can calculate the number of moles of ethyl alcohol that evaporated.

For example, if the initial volume of ethyl alcohol was 1,000 mL and the final volume was 900 mL, the volume of ethyl alcohol that evaporated would be V_e = 1,000 mL - 900 mL = 100 mL. The number of moles of ethyl alcohol that evaporated would be:

n = 100 mL/(22,400 mL/mol) = 0.0044 moles

I hope this helps! Let me know if you have any questions.

Answer:

neutral

Explanation:

Neutrons have a neutral charge, protons have positive, and electrons have negative. Hope this helps! :)m

Dissolve a sugar cube in water and you still have sucrose, not oxygen, carbon, and hydrogen. This does not mean that sucrose or water cannot be broken down into simpler substances.

But methods must involve a chemical change.

The change in which the molecular composition is completely altered and a new product is formed is called a chemical change.

Chemical changes create a new product.

The changes in chemical change are irreversible and permanent.

A chemical change occurs when the substance's composition is changed. When bonds are broken and new ones are formed a chemical change occurs.

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Al₂(SO₄)₃

= 2.Al+3.S+12.O

= 2.27 + 3.32+12.16

= 54+96+192

=342 g/mol

The first mistake that the student made is drawing the start line with ink. So it will run/dissolve in the solvent / split up

The second mistake that the student made is placing the solvent above the spots or start line instead of under them. So they will mix with solvent or wash off paper or color the solvent or dissolve in the solvent.

In the first mistake, there is no clear, visible starting line for the experiment as the ink flows or dissolves in the solvent. This error can lead to confusion and inaccuracy in results as students cannot accurately measure or compare the progress of their experiments.

The second mistake, it mixes or washes away the solvent with the dirt and starts the line, making it difficult or impossible to observe or measure the progress of the experiment. This error can also lead to inaccuracies in results, as students may not be able to accurately measure or compare the progress of their experiments.

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The effect of errors on the calculated concentration of CI is significant.

A 10.00 mL diluted chloride sample was titrated with 0.02749 M AgNO3, and 16.51 mL AgNO, was required to reach the endpoint. The effect of errors on the calculated concentration of CI can be explained as follows:a. The student read the molarity of AgNO, as 0.02479 M instead of 0.02749 M. If the student read the molarity of AgNO, as 0.02479 M instead of 0.02749 M, then the experimentally calculated moles of Ag would be too high. Consequently, the calculated [CI] in the unknown would come out too low. b.

The student was past the endpoint of the titration when the final buret reading was taken. If the student was past the endpoint of the titration when the final buret reading was taken, then the experimentally determined moles of Ag would be too low. This would cause the calculated C1 concentration to come out too high. Consequently, the calculated moles of CI would come out too high. Therefore, the effect of errors on the calculated concentration of CI is significant.

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Answer:

35.453 atomic mass units

You can use Phet (Atomic masses, Elements and more)  for Chemistry

Answer:

A theory doesn’t change into a scientific law because of new or better evidence.

Explanation:

A theory will always remain a theory, and i law will remain a law. The reason being that theories and laws may differ on account of newfound countervailing evidence. Remember, theories and laws are very different from hypotheses.

If two electrodes have a source of potential difference of 100v connected to them, there will be infinite number of equipotential surfaces exists in space between them.

The surface on which all points have equal potential is known as equipotential surfaces. The points having the same potential under an electric field are called equipotential points. Similarly the connecting two equipotential points are called equipotential lines.

Now these all points if lie on a surface that surface is referred to as equipotential surface. Distribution of these points depends on the potential they have.

Two equipotential surfaces never intersect each other. Now, if two electrodes are connected to a 100 V source, there will be infinite number of equipotential surfaces within the space between them.

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Answer:

zany

Explanation:

Answer:

a fresh start

Explanation:

Answer:

Explanation:

P = 2.35g

Cl= 0.539 g

% MASS = mass of  X/ mass of a compound

 % mass of P =   2.35 / (2.35+ 0.539) =  81.34%

  % mass of Cl =  0.539 /(2.35+ 0.539) =  18.66 %

Answer:

what the person above me said

Explanation:

The options that correctly express the relationship between the volume and temperature of a gas at constant pressure are:

According to Charles' law, when the pressure is held constant, the volume of a given amount of gas is precisely proportional to its kelvin-scale temperature.

Because the gas particles are compressed closer together as the pressure on a gas rises, the volume of the gas decreases. In contrast, as a gas's pressure falls, its volume rises as a result of the gas's ability to spread its particles farther apart. Since the volume of the gas has expanded, the atmospheric gas exerts more force on weather balloons as they ascend through the atmosphere to areas of lower pressure.

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complete questions:

Which of the following options correctly express the relationship between the volume and temperature of a gas at constant pressure? Select all that apply.

As the temperature of the gas increases, the volume will increase.

The volume of the gas is directly proportional to the absolute temperature.

Answer:

a) 0°C

b) liquid

c) The energy supplied at 100°C is utilized in breaking the intermolecular forces in the liquid.

d) 100°C

e) gas

Explanation:

There are three States of matter; solid, liquid and gas. If we start heating 25g of ice in a beaker with a thermometer inserted into it, the ice will change from solid to liquid and finally to gas as the temperature increases.

At 0°C, the solid ice begins to melt and remains liquid between 0°C-100°C. This is called the liquid range of water. At 100°C, the heat supplied does not lead to further rise in temperature. The energy supplied is rather utilized in breaking the intermolecular forces in the liquid. This is known as the latent heat of vaporization. Above 100°C, the liquid is changed to vapour. Water vapour is commonly called steam.

Answer:

C) is your answer

Hope it helps

Answer:

Because of the summer season

Explanation:

The water in the dish which is uncovered will evaporate faster as compared to the one which is

covered. This is because the air above the uncovered dish has less water vapour over it as

compared to the one which is covered. The covered dish has good amount of moisture over it as

the closed lid does not allow the moisture to come in direct contact with air.

The concentration of the final solution is 2.07 M

Concentration is the abundance of a constituent divided by way of the overall volume of an aggregate. several sorts of mathematical descriptions may be outstanding: mass concentration, molar concentration, variety concentration, and extent awareness.

Given;

C₁ = 1.5 M NaCl

V₁ = 345 mL

C₂ =

V₂ =  250 mL

C₁V₁ = C₂V₂

C₂ = C₁V₁ /V₂

     = 1.5 × 345 / 250

     = 2.07 M

The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of answer.

The Concentration of an answer is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute

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