1. Change the following into correct scientific notation.
a) 0.03050 =
b) 0.256 x 10°=
c) 25.005 10 =​

The original volume of the concentrated solution was 182.7 mL.

To solve this problem, we can use the formula for dilution:

C1V1 = C2V2

Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

We are given that the initial concentration (C1) is 2.3 M, the final concentration (C2) is 2.1 M, and the final volume (V2) is 191.8 mL. We want to find the initial volume (V1).

Plugging in the values we know into the dilution formula, we get:

(2.3 M) V1 = (2.1 M) (191.8 mL)

Simplifying this expression, we can solve for V1:

V1 = (2.1 M) (191.8 mL) / (2.3 M)

V1 = 182.7 mL

It's important to note that the units of concentration and volume must be consistent in this formula. In this case, the concentrations are given in units of M (moles per liter), and the volumes are given in units of mL (milliliters).

For such more questions on concentrated

brainly.com/question/29661329

#SPJ11

The statement they offer personal and professional knowledge is TRUE about expert witnesses (Option A).

The specific role performed by witnesses in a given case is to answer questions associated with a subject matter, which are associated with evidence to confirm or reject a given hypothesis.

Therefore, with this data, we can see that the work performed by witnesses is to provide answers in a given subject matter, which is information that may be used as empirical evidence to confirm or reject a given process.

Learn more about the work of the witnesses here:

https://brainly.com/question/13443620

#SPJ1

Answer:

In the given question, the mass of empty slender is given 25 points 489 Grand. The mass of Slender plus unknown liquid is given 57 points 847 g. The volume of a non liquid is given 45 three ml. We have to find the density of a non liquid. Firstly we will find the mass of unknown liquid. As the mass of unknown liquid is equal to the mass of cylinder plus unknown liquid minus the mask of empty cylinders. So the mass of a non liquid is equal to seven points 847 g -25 points 489 g. The mass of a non liquid will be 32 points 358 g. The formula to calculate the density of a non liquid is equal to the mass of a non liquid divided by the volume of a non liquid. So we will put the values as the mass of a non liquid is 32.358 g, Divided by the volume, which is given 45.3 ML. When we solve this Comes out to be 0.71 g, but I am in. So the Final answer is the density of a non liquid is equal to 0.71 g.

The thyroid gland produces and secretes two hormones, thyroxine (T4) and triiodothyronine (T3), which are involved in regulating the body's metabolism.

The thyroid gland is regulated by the pituitary gland, which secretes thyroid-stimulating hormone (TSH). When TSH binds to receptors on the thyroid gland, it stimulates the production and secretion of T4 and T3. These hormones play an important role in the growth and development of the body's tissues and organs, including the brain, heart, and muscles.

If there is an overproduction of thyroid hormones, it can lead to hyperthyroidism, which can cause symptoms such as weight loss, nervousness, and rapid heartbeat. On the other hand, an underproduction of thyroid hormones can lead to hypothyroidism, which can cause symptoms such as fatigue, weight gain, and cold intolerance.

To know more about thyroid gland visit:-

brainly.com/question/16867213

#SPJ1

The concentration of the solution in molarity, given that 6.802×10²⁰ particles were dissolved in 0.38 L of water is 3.0×10⁻³ M (option B)

First, we shall determine the number of mole that contains 6.802×10²⁰ particles of Mn(NO₃)₃. Details below:

From Avogadro's hypothesis,

6.022×10²³ particles = 1 mole of Mn(NO₃)₃

Therefore, we can say that

6.802×10²⁰ particles = 6.802×10²⁰ / 6.022×10²³

6.802×10²⁰ particles = 0.001 mole of Mn(NO₃)₃

Finally, we shall obtain the molarity of the solution. Details below:

Molarity of solution = mole / volume

Molarity of solution = 0.001 / 0.38

Molarity of solution = 3.0×10⁻³ M (option B)

Learn more about molarity:

https://brainly.com/question/16073358

#SPJ1

Answer:

132 gallons.

Explanation:

\( \frac{1.056 \times 500}{4} = 132 \: gallons\)

The volume of water contained in 500 litres is approximately similar to 132 gallons of water.

We will make use of the following conversion factors in order to convert five hundred litres of water to gallons: 1 litre = 1.056 quarts and 4 quarts = 1 gallon.

First, let's convert litres to quarts:

500 litres * 1.056 quarts/liter = 528 quarts.

Next, let's convert quarts to gallons:

528 quarts * (1 gallon / 4 quarts) = 132 gallons.

Therefore, the volume of water contained in 500 litres is approximately similar to 132 gallons of water.

Learn more about conversion factors, here;

https://brainly.com/question/30567263

#SPJ6

Answer:

Most likely A. Molten lava, since it straight up melts the equipment which is much faster than chemicals dissolving the equipment like hydrochloric acid and nitric acid.

Explanation:

Hope this helped!

P.S. Sure, why not?

Answer: yes it it balanced you have 2 atoms on both sides of the equation

Explanation:

Answer:

they show fracture lines shown in geological maps

Explanation:

hope this helps

a) The saturated solubility level of KCl (aq) at 40°C is 35.7 g/100 mL of water.

b) No, the solution would not be saturated at 90°C. At this temperature, the solubility of KCl in water is higher than at 40°C. Therefore, more KCl can dissolve in 100 g of water at 90°C than at 40°C. To determine if the solution is saturated, we need to compare the amount of KCl that actually dissolved in the water to the maximum amount of KCl that can dissolve in the water at that temperature. If the amount of KCl that dissolved is less than the maximum amount, then the solution is unsaturated. If the amount of KCl that dissolved is equal to the maximum amount, then the solution is saturated. If the amount of KCl that dissolved is greater than the maximum amount, then the solution is supersaturated.

c) Two ways in which saturation can be achieved if only 40 g of KCl is added to 100 g of water at 90°C are:

i) Heating the solution to a higher temperature: As the temperature of the solution is increased, the solubility of KCl in water also increases. Therefore, by heating the solution to a higher temperature than 90°C, more KCl can be dissolved in the water until the solution becomes saturated.

ii) Allowing the solution to cool slowly: If the solutionis heated to a temperature higher than 90°C and then allowed to cool slowly, the solubility of KCl in water decreases as the temperature decreases. This means that as the solution cools, KCl will begin to precipitate out of the solution until the solution becomes saturated. Alternatively, if the solution is left undisturbed at 90°C and allowed to cool slowly, KCl will begin to precipitate out of the solution as it reaches its saturation point.

The second-law efficiency of this freezer is 94.7%.

The second-law efficiency of a refrigerator or freezer is described as as the ratio of the desired cooling effect  which is the heat removed from the cold reservoir) to the energy input required to achieve this cooling effect.

The second-law efficiency of a refrigerator  formula is

η = Qc / W

we have the equation as

Qh = mCΔT = Qc

Tc = -7°C = 266 K

Th = 25°C = 298 K  and

W = Qh / (1 - Tc/Th) = Qc / (1 - Tc/Th) = 3.3 W

we have found  Qc = 3.125

W  = 3.3 W

we then substitute into the  second-law efficiency formula:

η = Qc / Wmin

η= 3.125 W / 3.3 W

η= 0.947 or 94.7%

Learn more about second-law efficiency at:

https://brainly.com/question/15025185

#SPJ1

The element that has the same number of valence electrons as phosphorus and the same number of electron shells as iodine is Antimony,  Sb.

Valence electrons are the electrons that are found in the outermost shell of an atom of an element.

The number of valence electrons in an atom determines the group to which the elements belong.

Electron shells are the shells in an atom to which an electron is fed into the atom. An electron shell determines the period an element belongs to.

Phosphorus has 5 valence electrons, hence belongs to group 5A or 15.

Iodine has 5 electron shells, hence belongs to period 5.

The element that belongs to group 5A period 5 is antimony.

Learn more about valence electrons at: https://brainly.com/question/22469411

#SPJ1

Answer:

2.39x10⁻⁴ moles

Explanation:

As the problem asks us the number of moles of KIO₃ that were titrated, all that is required of us is to calculate how many moles of KIO₃ are there in 23.92 mL of a 0.0100 M solution (All moles in the samples are titrated).

We can do so by using the definition of molarity:

converting 23.92 mL ⇒ 23.92 / 1000 = 0.02392 L

Answer:

123 g

Explanation:

First, we convert 10.0 dL into mL, keeping in mind that:

Now we can multiply the density by the volume in order to calculate the mass:

10.0 dL of a substance with a density of 0.123 g/mL would weigh 123 grams.

Examples of scenarios that would adhere to the law of conservation of energy are as follows:

The law of conservation of energy states that energy cannot be created nor destroyed but is conserved when it is transferred from one form to another.

The law of conservation of energy is obeyed by majority of natural and artificial systems. For example;

Learn more about law of conservation of energy at: https://brainly.com/question/20971995

Answer:

Answer is D on edge 2022

Explanation:

Answer:

0.93L

Explanation:

Hello,

To solve this question, we need to first of all write down the equation of reaction.

Equation of reaction,

2Mg + 4HCl → 2MgCl₂ + 2H₂

From the equation of reaction, it shows that 2 moles of Mg produces 2 moles of H₂.

Number of moles = mass / molar mass

Mass = number of moles × molar mass

Molar mass of Mg = 24g/mol

Mass = 2 × 24 = 48g

Therefore, 48g of Mg produces (2 × 22.4)L of H₂

48g of Mg = 44.8L of H₂

1g of Mg = xL of H₂

x = (1 × 44.8) / 48

x = 0.93L

1g of Mg will produce 0.93L of H₂

1) First, let's balance the chemical equation:

_S + _O2 --> _SO3

To balance the equation, we need to equal the number of atoms of each element on the reactants and products side.

2 S + 3 O2 --> 2 SO3

Reactants side:

S - 2

O - 6

Products side:

S - 2

O - 6

2) Now to calculate, we need to know the molar volume value. This is the space occupied, in liters, by 1 mole of any matter in a gaseous state and under normal conditions of temperature and pressure (STP). The value is 22.4 liters/mol

So let's transform 9.1 L of SO3 into mole:

22.4 liters --- 1 mol

9.1 liters ---- x mol

22.4x = 9.1

x = 0.406 moles of SO3

3) Now we use the reaction proportion to know how many moles of O2 is needed:

3 moles of O2 ----- 2 moles of SO3

x moles of O2 ----- 0.40625 moles of SO3

2x = 1.21875

x = 0.609375 moles of O2

4) Now let's transform moles of O2 into liters using the molar volume value:

22.4 L ---- 1 mol

x L ----- 0.609375

x = 13.7 liters of O2

Answer: It is needed 13.7 liters of O2.

The number of moles for the quanity 8.06 x\(10_{21\) atoms of Pt​ is approximately 2.61 grams.

To calculate the number of moles for a given quantity of atoms, we can use Avogadro's number and the molar mass of the element. Avogadro's number is 6.022 x 10²³ atoms/mol.

In this case, you have 8.06 x 10²¹ atoms of Pt. To find the number of moles, divide this quantity by Avogadro's number:

8.06 x 10²¹  atoms Pt / 6.022 x 10²³  atoms/mol = 0.0134 mol Pt

So, there are approximately 0.0134 moles of Pt in 8.06 x 10²¹  atoms of Pt.

The molar mass of Pt (platinum) is 195.08 g/mol. To convert the number of moles to grams, multiply the number of moles by the molar mass:

0.0134 mol Pt x 195.08 g/mol = 2.61 g Pt

Therefore, there are approximately 2.61 grams of Pt in 8.06 x10²¹  atoms of Pt.

In summary, the number of moles for the quantity 8.06 x 10²¹ atoms of Pt is approximately 0.0134 moles. This is equivalent to approximately 2.61 grams of Pt. Remember to use Avogadro's number and the molar mass to perform these calculations accurately.

Know more about  moles   here:

https://brainly.com/question/29367909

#SPJ8

Answer:

\(8.97x10^{22}molecules C_3H_8\)

Explanation:

Hello there!

In this case, according to the given chemical reaction and the fact that 22.4 L of a gas are occupied by 1 mol at standard pressure and temperature conditions, it will be possible for us to calculate the number of molecules of propane, by using the Avogadro's number, the 1:3 mole ratio with carbon dioxide and the aforementioned volume-mole ratio to obtain:

\(10.01LCO_2*\frac{1molCO_2}{22.4LCO_2}*\frac{1molC_3H_8 }{3molCO_2} *\frac{6.022x10^{23}molec\ C_3H_8}{1molC_3H_8} \\\\=8.97x10^{22}molecules C_3H_8\)

Regards!

Answer:

.3

Explanation:

aC2H6 + bCO2 + cH2O → dC2H5OH The balanced equation for the reaction is given as; 6C2H6 + 2CO2 + 3H2O → 7C2H5OH, Check! Oxygen  Product = 7 Carbon Reactant = 6 * 2  +  2  = 14 Product = 7 * 2 =14 Hydrogen d = 7.

The manner that chemical equations are written ensures that almost all of the molecules are visible.Each oxygen molecule contains two oxygen atoms, which is why the symbol for it is [2].Recall that only two oxygen atoms make up each diatomic oxygen molecule that we breathe.

Oxidation processes, addition reactions, substitution reactions, and combustion reactions are the four basic types of reactions in which carbon is primarily involved.When carbon burns with oxygen present, heat and light are produced.

To know more about Oxygen visit:

https://brainly.com/question/2272415

#SPJ4

When an alarm sounds in the laboratory, it is important to respond quickly and remain calm. Listen for any other instructions, turn off any equipment in use, and be prepared to leave immediately.

What is laboratory?

Laboratory is a place where scientific experiments and measurements are performed. It is equipped with various types of equipment and instruments to carry out experiments and tests. Laboratories are usually used by scientists and technicians to conduct experiments, analyze samples, and conduct research. It is an area that is designed to be kept clean and organized in order to ensure safety and accuracy when conducting experiments. Laboratories can be found in many different settings such as hospitals, universities, research and development centers, and manufacturing facilities.

To learn more about laboratory
https://brainly.com/question/29482908

#SPJ4

Answer: Electrons are taken up by \(PbO_2\) and they are lost by \(HCl\)

Explanation:

Redox reaction is defined as the reaction in which oxidation and reduction take place simultaneously. It is also called the reaction where the exchange of electrons takes place.

An oxidation reaction is defined as the reaction in which a chemical species loses electrons takes place. In this reaction, the oxidation state of a substance gets increased.

A reduction reaction is defined as the reaction in which a chemical species gains electrons takes place. In this reaction, the oxidation state of a substance gets reduced.

For the given chemical reaction:

\(PbO_2+4HCl\rightarrow PbCl_2+Cl_2+2H_2O\)

The half-reactions for this redox rection follows:

Oxidation half-reaction:  \(2HCl\rightarrow ClO_2 + 2e^-\)

Reduction half-reaction:  \(PbO_2+2e^-\rightarrow PbCl_2\)

Hence, electrons are taken up by \(PbO_2\) and they are lost by \(HCl\)

For an electron as a particle, E = \(1/2mv^2\)

For an electron as a particle, the energy E can be described using the equation:

E =  \(1/2mv^2\)

where

This equation represents the kinetic energy of the electron, which is the E is the energy

energy associated with its motion.

This equation assumes classical mechanics and does not take into account relativistic effects that become significant at high speeds close to the speed of light.

More on electrons can be found here: https://brainly.com/question/12001116

#SPJ1

The rate constant for the reaction is either 7.14×10−3 s−1 or 2.50×10−3 s−1, depending on which rate was used to calculate it.

The rate of the reaction is given by the equation:

Rate = -k[A]

where k is the rate constant and [A] is the concentration of the reactant.

Rate at t=140 s:

Rate = (8.00×10−2 M - 0 M) / (140 s - 0 s)

= 5.71×10−4 M/s

Rate at t=400 s:

Rate = (4.00×10−2 M - 0 M) / (400 s - 0 s)

= 1.00×10−4 M/s

Since this is a zero-order reaction, the rate of the reaction is constant, and we can use either rate to calculate the rate constant:

k = Rate / [A]

Using the rate at t=140 s:

k = 5.71×10−4 M/s / 8.00×10−2 M = 7.14×10−3 s−1

Using the rate at t=400 s:

k = 1.00×10−4 M/s / 4.00×10−2 M

= 2.50×10−3 s−1

The rate constant for the reaction is either 7.14×10−3 s−1 or 2.50×10−3 s−1.

Learn more on zero-order reaction https://brainly.com/question/21663229

#SPJ1

The correct option is D. loss of electrons.

Loss of electrons is the statement best describes the process of oxidation.

Chemical reaction known as oxidation is described as a procedure that takes place when atoms or group of atoms lose electrons. If a chemical species gains oxygen or loses hydrogen, that is an example of oxidation. Oxidation takes place when these things happen.

An oxidising agent is any substance that causes another chemical lose electrons (become oxidised). On the other hand, a reducing agent is any chemical that causes another chemical to gain electrons.

The biochemical oxygen demand of wastewater is reduced after oxidation, which also reduces some contaminants' toxicity. Some contaminants undergo this treatment and are transformed into carbon dioxide, water, and biosolids. Disinfection is frequently accomplished using chemical oxidation.

To know more about oxidation refer here:

https://brainly.com/question/25798412#

#SPJ4

Answer:

35 gm

Explanation:

What is mass of 0.6 mol C4H10

C4H10 has a molar nass of

(4X12) (10

X 1) = 48 + 10 8

so 1 mole of C4H10 is 58 gm

so 0.6 moles is

(0.6 X58) = 35 gm

The final temperature of the mixture given that 25 g of water at 25 °C is mixed with 25 g of water at 65 °C, is 45 °C

The final temperature of the mixture can be obtained by calculating the equilibrium temperature of the mixture. This is shown below:

Heat loss by warm water = Heat gain by cold water

MᵥᵥC(Tᵥᵥ - Tₑ) = MC(Tₑ - T)

Cancel out C

Mᵥᵥ(Tᵥᵥ - Tₑ) = M(Tₑ - T)

25× (65 - Tₑ) = 25 × (Tₑ - 25)

Cancel out 25

65 - Tₑ = Tₑ - 25

Collect like terms

65 + 25 = Tₑ + Tₑ

90 = 2Tₑ

Divide both side by 2

Tₑ = 90 / 2

Tₑ = 45 °C

Thus, we can conclude that the final temperature the mixture is 45 °C

Learn more about temperature:

https://brainly.com/question/14281142

#SPJ1