4.731 * 10 ^ - 7 / 5.7 * 10 ^ 3 express in scientific notation

Answer: The correct answer would be : True

I hope that this helps you !

Answer:

5.1  x 10⁻¹

Explanation:

Given:

6.4 × 10⁻³ × 8.0 × 10¹

Find:

Value of equation

Computation:

6.4 × 10⁻³ × 8.0 x 10¹

[6.4 × 8.0] × [10⁻³ × 10¹]

[51.2] × [10⁻²]

5.12 x 10⁻¹

5.1  x 10⁻¹ (Approx)

Answer:

CH₃(CH₂)₁₀COONa

Explanation:

The compounds given are

NaCl

CH₃COOH

CH₃COONH₄

CH₃(CH₂)₁₀COONa

CH₃(CH₂)₁₀CH₃

CH₃(CH₂)₁₀COONa will form micelle . Micelle are formed by soap solution which helps in the removal of oily dirt from our clothes . They are spherical shaped tiny droplet of oil which contains the tail of long chain organic compound like salt of long chain fatty  acids . The surface of the droplet is lined with the tip of the chain which consists of negative charge of the tail end . On the average , each micelle contains a specific amount of charge . Due to it , they make colloidal solution in the water and gets washed off my water . The oily dirt is thus removed .

CH₃(CH₂)₁₀COONa   ⇄     CH₃(CH₂)₁₀COO⁻   +    Na⁺

CH₃(CH₂)₁₀COO⁻  part which is long chain of fatty acid gets adsorbed by oily droplet formed by oily dirt  and forming micelle .

Answer: the two parameters change inversely; as hydrogen ion concentration increases, pH falls. due to the logarithmic relationship, a large change in hydrogen ion concentration is actually a small change in pH. For example, doubling the hydrogen ion concentration causes pH to fall by just 0.3.

Answer: Yes

Explanation:

Density of a liquid depend on its volume. This is because Density is mass of liquid divided by volume.

Density is inversely proportional to volume.

As density increases, volume decreases and vice versa. The density for water is 1g/ milliliter but it changes with changes in temperature or there are impurities dissolved in it. Ice is less dense that liquid water and it's the major reason it's float because it's volume is inversely proportional to it's density.

Answer:

Which jacket traps the most heat.

Explanation:

I took the test

Answer:

B. Which jacket traps the most heat?

Explanation:

Just got it right on Edg

Answer:

D.ionic interaction is a strong interaction

When atoms come close enough to one another, an ionic connection is created. Atoms can interact with one another ionically, and this distance is greater than the bonding distance. Therefore, option D is correct.

The main interaction taking place in ionic compounds is ionic bonding, a form of chemical bonding that includes the electrostatic attraction between two atoms or ions with dramatically differing electronegativities.

Ions with opposing charges are drawn to one another through ion-ion interactions. They are also known as ionic bonds, because they are what keep ionic compounds together. opposing charges attract each other whereas like charges repel each other.

The whole transfer of valence electrons between atoms is referred to as an ionic bond. It is a kind of chemical connection that produces two ions with opposing charges. In ionic bonding, the nonmetal receives the electrons to become a negatively charged anion while the metal gives them up to become a positively charged cation.

Thus, option D is correct.

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Answer: 3 qualitative: the word pharmacology is written in blue, the stairs are gray, the tile on the first floor is yellow. 3 quantitative: there are four people wearing yellow, there are Four pink boxes, there are two floors.

Inference: there are many people performing experiments so it’s a lab.

Explanation:

Answer:

Qualitive - The bars are yellow, The floor is green, and the floor has pharmacology on it.

Quantitative - There are 8 support bars, There is 3 gray coats, and there is 27 pills that I can see on that picture.

Inference - There are many people doing experiments because the word pharmacology is on the floor.

Explanation:

This picture tells you that pharmacology is a form of study of medicine and drugs.

Answer:

17.5609grams

Explanation:

According to the question, a sample of mass 6.814 grams is added to another sample weighing 0.08753 grams i.e.

= 6.814 + 0.08753

= 6.90153 grams

The result of this mixture i.e. 6.90153 grams is divided into three equal parts i.e.

= 6.90153 ÷ 3

= 2.30051 grams

This means that each equal part weighs 2.30051 grams

One of the yield (2.30051 grams) is multiplied by 7.6335 times i.e.

= 2.30051 × 7.6335

= 17.56094309

Hence, the final mass is 17.5609grams

Answer:

B. CO2

Explanation:

Because its a neutral compound hence lacks any form of dipole dipole interaction

Answer:

A. Neopentane.

B. 2,2-dimethyl-propane.

Explanation:

Hello,

In this case, for the given compound we can spell out two possible names:

A. Neopentane: it is, because the molecule has five carbon atoms wherein there is a central one, bonded to the other four.

B. 2,2-dimethyl-propane: it is, because we find two methyl radicals at the second carbon.

Regards.

Answer:

B) The pH of a buffer solution does not change significantly when a small amount of acid is added.

C) The pH of a buffer solution is determined by the ratio of the concentration of acid to the concentration of base.

Explanation:

Buffer solution is useful in maintaining the pH of a solution constant . It is made of a weak acid and its salt or a weak base and  its salt . Ph of a buffer is given by the following relation .

pH = pKa + log [ A⁻ ] / [ HA ]

A- is a base and HA is a weak acid .

When we add acid , it reacts with A⁻ or base and gets neutralised .

When we add base , it reacts with acid HA and gets neutralised . In this way it maintains the pH of the solution .

Correct statements are as follows:

B) When a tiny amount of solvent is introduced to a buffer, the pH doesn't really alter considerably.

C) The ratio of acids to base concentration determines the pH of a phosphate buffer.

So, options B) and C) are correct.

ph scale used in science to measure the acidity or alkalinity of an aqueous solution. pH originally stood for "potential of hydrogen." The pH of acidic solutions is lower than that of basic or alkaline solutions.

Correct statements are as follows:

B) When a tiny amount of solvent is introduced to a buffer, the pH doesn't really alter considerably.

C) The ratio of acids to base concentration determines the pH of a phosphate buffer.

So, options B) and C) are correct.

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Answer:

Difference between Vapor and Gas

Usually, a vapour phase consists of a phase with two different substances at room temperature, whereas a gas phase consists of a single substance at a defined thermodynamic range, at room temperature

Explanation:

Explanation:

pure substances are those substances which are made up of one elements

mixture that those substances which are made by more than two or three elements

Answer:

Brainliest is appreciated

Explanation:

Substances which have a specific composition and cannot be separated into any constituents are called pure substances. Pure substances are further divided into elements and compounds. The combination of two or more pure substances is called a mixture. Mixtures can be classified into two types viz. heterogeneous and homogeneous mixtures. 

EXAMPLES

pure substance

gold, pure water, hydrogen gas

mixture substance

oil and water, sand and sugar

Answer:

The amino acid will become more negatively charged

Explanation:

Amino acids are organic compounds containing the positive amine (-NH₂) group which is the basic group, and the negative carboxylic (-COOH) group, which is the acidic group. Because they contain both acidic and basic groups with a positive and negative charge that do not contain an overall electric charge, they are known as zwitterions. They are the smallest units of a protein molecule.

When a hydroxide group is added to an amino acid, the PH is increased, and the hydrogen ion on the amine (NH₃+) is removed, making the compound to have an overall negative charge, hence it is no longer a zwitterion.

[tex]\chemfig{N H_3^+-R-CH-COO^- + OH^- \longrightarrow \chemfig{N H_2-R-CH-COO^- + H_2O[/tex]

notice that the amino group has a net negative charge on the product side of the reaction

The addition of hydroxide to an amino acid affects the charge on the amino acid as it will become more negatively charged.

It will become more negatively charged.

When placed in an electromagnetic field, the physical attribute of matter known as electric charge causes it to experience a force.

A positive or negative electric charge can exist. Amino acids are chemical molecules made up of amino and carboxylate. Hydroxide is a polyatomic ion made up of two elements: oxygen and hydrogen.

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Given :

Some volume measurements :

[tex]0.75 \times 10^{-3}\ mL,\ 325\ \mu L,\ 4.11 \times 10^{-4}\ dL[/tex]

To Find :

Rank the measurements from largest to smallest.

Solution :

Now , [tex]1\ \mu l=10^{-3}\ ml[/tex].

Also , [tex]1\ dl=100\ ml[/tex].

So , the measurements in same units are :

[tex]0.75 \times 10^{-3}\ mL,\ 325 \times 10^{-3}\ mL , 4.11 \times 10^{-4} \times 100\ mL\\\\0.75\times 10^{-3}\ mL ,\ 325\times 10^{-3}\ mL ,\ 41.1\times 10^{-3}\ mL[/tex]

So , the order from highest to lowest is :

[tex]325\times 10^{-3}\ mL ,\ 41.1\times 10^{-3}\ mL ,\ 0.75\times 10^{-3}\ mL[/tex]

Hence , this is the required solution .

325 µL > 41.1 µL > 0.75 µL is the ranking of the measurements from largest to smallest.

Measurements have a crucial role in many aspects of daily life, including science, engineering, construction, and cookery. They enable precise measurement, comparison, and communication of an object's size, quantity, or amount. The most widely used measurement systems globally are the metric and imperial systems. There are other measurement systems as well. The International System of Units (SI), generally known as the metric system and based on multiples of ten, is extensively used. It comprises measures for length and mass including metres, grammes, and litres. Units like feet, pounds, and gallons are part of the imperial system, which is primarily used in the United States.

1 mL = 1000 µL      

1 dL = 100 mL

.75 x [tex]10^{-3}[/tex] mL = .75 x [tex]10^{-3}[/tex] x 1000 µL

                      = 0.75 µL

4.11 x [tex]10^{-4}[/tex] dL = 4.11 x[tex]10^{-4 }[/tex]x 100 mL

                     = 0.0411 mL

                     = 41.1 µL

325 µL > 41.1 µL > 0.75 µL

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Answer:

521 nm

Explanation:

The following data were obtained from the question:

Frequency (f) = 5.76×10¹⁴ s¯¹

Wavelength (λ) =?

Velocity (v) , wavelength (λ) and frequency of a wave are related according to the following equation:

Velocity (v) = wavelength (λ) × frequency (f)

v = λf

With the above equation, we can obtain the wavelength of the photon of the green light as follow:

Frequency (f) = 5.76×10¹⁴ s¯¹

Velocity of light (v) = 3×10⁸ m/s

Wavelength (λ) =?

v = λf

3×10⁸ = λ × 5.76×10¹⁴

Divide both side by 5.76×10¹⁴

λ = 3×10⁸ / 5.76×10¹⁴

λ = 5.21×10¯⁷ m

Finally, we shall convert 5.21×10¯⁷ m to nanometer (nm).

This can be obtained as follow:

1 m = 1×10⁹ nm

Therefore,

5.21×10¯⁷ m = 5.21×10¯⁷ × 1×10⁹

5.21×10¯⁷ m = 521 nm

Therefore, the wavelength (λ) of the photon of the green light is 521 nm

Answer:

[tex]V=23.5L[/tex]

Explanation:

Hello,

In this case, it is convenient to compute the car's mileage in km/L as follows:

[tex]25.0\frac{mi}{gal}*\frac{1km}{0.6214mi}*\frac{1gal}{3.78L}=10.64\frac{km}{L}[/tex]

In such a way, since the distance is measured to be 250 km, the volume requirement is:

[tex]V=\frac{250km}{10.64kg/L}\\ \\V=23.5L[/tex]

Regards.

Answer:

compound and elements.

Explanation:

Answer:

THE MOLARITY IS 2.22 MOL/DM3

Explanation:

The solution formed was as a result of dissolving 37.5 g of Na2S in 217 g of water

Relative molecular mass of Na2S = ( 23* 2 + 32) = 78 g/mol

Molarity in g/dm3 is the amount of the substance dissolved in 1000 g or 1 L of the solvent. So we have;

37.5 g of Na2S = 217 g of water

( 37.5 * 1000 / 217 ) g = 1000 g of water

So, 172.81 g/dm3 of the solution

So therefore, molarity in mol/dm3 = mol in g/dm3 / molar mass

Molarity = 172.81 g/dm3 / 78 g/mol

Molarity = 2.22 mol/dm3

The molarity of the solution is 2.22 mol/dm3

Answer:

The answer is 2.22mol

Explanation:

Answer:

1007.94 J

Explanation:

Work done: This can be defined as the product of force and distance, along the direction of the force. The S.I unit of work is Joules (J) .

Form the question above,

W = F×d........................... Equation 1

Where W = Work done, F = Resistive force, d = distance.

Given: F = 21.4 N, d = 47.1 m

Substitute these values into equation 1

W = 21.4(47.1)

W = 1007.94 J

Answer: sorry I cant help you I need the same answer

Explanation:

Answer:

b

Explanation:

Answer:what’s the answer

Explanation:

Answer:

A. K₂C₂O₄          Potassium oxalate

B. CuC₂O₄          Copper oxalate

C. Bi₂(C₂O₄)₃         Bismuth (III) oxalate

D. Pb(C₂O₄)₂         Lead (IV) oxalate

E. (NH₄)₂C₂O₄       Ammonium oxalate

F. HC₂O₄⁻             Acid oxalate

Explanation:

C₂O₄⁻²  → oxalate anion

This is the conjugate base from the H₂C₂O₄ which is the oxalic acid. A weak dyprotic acid that can release 2 protons.

A. 2K⁺  +  C₂O₄⁻²  → K₂C₂O₄          Potassium oxalate

It can be formed by the neutralization of the acid with the base

H₂C₂O₄  + 2KOH  → K₂C₂O₄  +  2H₂O

B. Cu²⁺ +  C₂O₄⁻²   ⇄  CuC₂O₄  ↓

This is a precipitate.

C.  2Bi³⁺  +  3C₂O₄⁻²   ⇄  Bi₂(C₂O₄)₃  ↓

This is a precipitate.

D.  Pb⁴⁺ +  2C₂O₄⁻²   ⇄  Pb(C₂O₄)₂  ↓

This is a precipitate.

E. 2NH₄⁺  +  C₂O₄⁻²   ⇄  (NH₄)₂C₂O₄  ↓

This is a precipitate.

F. This is the conjugate strong base, for the weak acid

H⁺  +  C₂O₄⁻²   ⇄  HC₂O₄⁻

HC₂O₄⁻  + H₂O  ⇄  C₂O₄⁻²  +  H₃O⁺    Ka

HC₂O₄⁻  + H₂O  ⇄  H₂C₂O₄  +  OH⁻    Kb

HC₂O₄⁻  is an amphoteric compound

A. K₂C₂O₄            →Potassium oxalate

B. CuC₂O₄           →Copper oxalate

C. Bi₂(C₂O₄)₃        →Bismuth (III) oxalate

D. Pb(C₂O₄)₂        →Lead (IV) oxalate

E. (NH₄)₂C₂O₄      →Ammonium oxalate

F. HC₂O₄⁻             →Acid oxalate

Given:

It is the conjugate base from the H₂C₂O₄ which is the oxalic acid. A weak diprotic acid that can release 2 protons.

The reactions involved in this are:

A. 2K⁺  +  C₂O₄⁻²  → K₂C₂O₄          

B. Cu²⁺ +  C₂O₄⁻²   ⇄  CuC₂O₄  ↓

C. 2Bi³⁺  +  3C₂O₄⁻²   ⇄  Bi₂(C₂O₄)₃  ↓

D. Pb⁴⁺ +  2C₂O₄⁻²   ⇄  Pb(C₂O₄)₂  ↓

E. 2NH₄⁺  +  C₂O₄⁻²   ⇄  (NH₄)₂C₂O₄  ↓

↓- This symbol denotes the precipitate formation.

F. H⁺  +  C₂O₄⁻²   ⇄  HC₂O₄⁻

HC₂O₄⁻  is an amphoteric compound.

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Answer: The 3rd and 6th bullet point is the quantitative data.

Explanation: Quantitative data is expressed by NUMBERS and Qualitative data is expressed by WORDS. The 3rd and 6th one is correct because they both use numbers to compare how much time hummingbirds spent feeding on nectar.  

Answer:

The trade was difficult with the old system.

Explanation:

The existing system for the measurement of goods did not work well in the trade because there are different system used by the people of different cities so metric system was used in the whole country in place of the old system of measurement during the French Revolution in order to make the trade easier and quick across the country. This metric system is extensively used in the trade as compared to the old system of measurement due to its easiness and fast.

Answer:

Electrolytes are minerals in your body that have an electric charge. They are in your blood, urine, tissues, and other body fluids. Electrolytes are important because they help. Balance the amount of water in your body

Explanation: