Which pure substance can be classified as an element?
H2
NO3
NaCl
H2SO4

Answer:

A

Explanation:

For Connexus/Edge

Answer:  A change in the first second and third

Explanation:

An electron in the lowest energy state is called as ground state and is also known as stable energy level.  An electron in the upper energy state is called as excited state and is also known as unstable energy level.

Electronic configuration represents the total number of electrons that a neutral element contains. The electrons are filled according to Afbau's rule in order of increasing energies. As the atomic number of sodium is 11. The electronic configuration of sodium will be represented in ground state as:

\(Na:11:1s^22s^22p^63s^1\)

Thus any electron if occupies a higher shell, the atom is said to be in excited state.

The solution pH range is based on the given indicators:

Alizarin yellow- Yellow: 10 to 12

Bromocresol Green - blue: 3.8 to 5.4

Bromothymol Blue - green: 6.0 to 7.6

Methyl orange - yellow: 3.1 to 4.4

A pH indicator can be described as a halochromic chemical compound added in small amounts to a solution so the pH of the solution can be determined by changes in absorption or emission properties.

pH indicators are employed in titrations in analytical chemistry and biology to calculate the extent of a reaction. Because of the determination of color, pH indicators are susceptible to giving imprecise readings.

Alizarin yellow has a pH range of 10 to 12 where 10 for yellow and 12 for red. Bromocresol Green have a pH range of 3.8 to 5.4

Bromothymol Blue has a pH range of 6.0 to 7.6 where 6.0 for Yellow and 7.6 for Blue color. Methyl orange has a pH range of 3.1 to 4.4 where 3.1 is for red and 4.4 is for yellow color.

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Applications of anaerobic respiration is generating microbial fuel cell

Anaerobic respiration is the because of lack of oxygen they carry out respiration in the absence of oxygen to produce the energy they require called as anaerobic respiration

Anaerobic respiration is useful generating microbial fuel cell which employ bacteria that respire solid electron acceptor to transfer electron from reduced compound to an electrode this process can simultaneously degrade organic carbon waste and generate electricity

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Answer:

Q = 836 J

Explanation:

Given data:

Mass of water = 10.0 g

Temperature increased =ΔT = 20°C

Specific heat  capacity of water = 4.18 J/g.°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Q = 10.0 g × 4.18 J/g.°C  × 20°C

Q = 836 J

Answer:

SO4²

Explanation:

Formula and structure: The sulfate ion formula is SO42- and the molar mass is 96.06 g mol-1. This salt is formed by one sulfate center to which 4 atoms of oxygen are attached, 2 of these atoms are forming S=O.

Answer:

\(so _{4} ^{2 - } \)

Explanation:

sulfate is consisting of sulfur element with 4 oxygen as the structure in the pic given and this group is 2- charged

Answer:

they will die because they need to be in salt water

The shelf-life of the reconstituted ampicillin suspension remains unchanged at 16 days when stored at room temperature (25°C) compared to storing it in the refrigerator at 5°C.

To calculate the shelf-life of the reconstituted ampicillin suspension at room temperature, we'll assume that the degradation follows an Arrhenius relationship.

Shelf-life at 5°C (T₁) = 16 days

Temperature at 5°C (T₁) = 5°C

Temperature at room temperature (T₂) = 25°C

To find the shelf-life at room temperature, we can use the Arrhenius equation:

k₁ / k₂ = exp((Ea / R) * (1/T₂ - 1/T₁))

Since we don't have specific values for Ea and the reaction rate constants, we'll assume that they are the same for simplicity. Thus, we can write:

k₁ / k₂ = exp((Ea / R) * (1/25 - 1/5))

Simplifying the equation, we get:

exp((Ea / R) * (4/125)) = 1

To satisfy this equation, the exponential term must be zero, which implies:

(Ea / R) * (4/125) = 0

Solving for Ea, we find:

Ea = 0

Since Ea is zero, it means the reaction rate constants and degradation rates are the same at both temperatures. Therefore, the shelf-life at room temperature (25°C) is the same as the shelf-life at 5°C, which is 16 days.

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Answer:

it's volume also decrease

Answer:

Pupa Stage

Explanation:

Silk worm consists of four stages- the adult, the egg, the larva (caterpillar) and the pupa stage.

The whole Balanced Reactions Quick Check for Honors Chemistry A is

1) A. The reactants and products have the same number and type of atoms, but the atoms may be recombined.

2) B. It shows how many molecules there are of a particular substance.

3) D. NaOH + HCl → NaCl + H2O

4) A. Atoms always remain intact during chemical reactions.

5) D. 4, 4

Considering the definition of chemical reaction, the correct answer is the first option: A coefficient shows how many molecules there are of a particular substance.

Chemical reaction is the way one substance reacts against another. That is, a chemical reaction occurs when the substances participating in it are transformed into different ones.

The chemical bonds between the atoms are broken and new bonds are formed. And there are two types of substances involved: those that are initially possessed are known as reactants and the substances that are obtained after the chemical reaction are called products.

A chemical equation is a way of expressing, using symbols and formulas, a chemical reaction. In it, the reactants are determined, the products are predicted and the proportions of the substances involved in the reaction are indicated.

Then, the stoichiometric coefficients indicate in what proportion the amounts of reactants and products of the reaction take part in the reaction.

Finally, the correct answer is the first option: A coefficient shows how many molecules there are of a particular substance.

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Answer:

rocks beneath the surface melt seems like the answer that makes the most sense

Answer:

Rocks beneath the surface melt

Explanation:

Answer:

4

Explanation:

Sodium Na, Carbon C, hydrogen H2, Oxygen O

The true statements about the SDS-PAGE is the correct option is b) Smaller proteins migrate faster through the polyacrylamide gel. c) Protein-SDS complexes migrate toward the negative electrode. d) A protein binds roughly 1.4 times its mass of SDS, resulting in a large overall negative charge.

The SDS-PAGE defined as the broadly utilized technique for distinguishing proteins. The SDS is the the sodium dodecyl sulfate that is the an ionic detergent. The SDS-PAGE is the method of the separating the proteins. The Smaller proteins will migrate faster through the polyacrylamide gel.

The migration of the protein takes place on the basis of the size. Therefore, the smaller proteins will be migrate to quickly through the gel in the comparison with the bigger proteins.

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Answer:

water is not a solid and a rock is a solid

The amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

To calculate the molarity of Kool Aid desired, we need to determine the number of moles of Kool Aid powder and sugar in the package. Since the molecular formula for sugar is C12H22O11, we can calculate its molar mass as follows:

Molar mass of C12H22O11 = (12 * 12.01) + (22 * 1.01) + (11 * 16.00)

= 144.12 + 22.22 + 176.00

= 342.34 g/mol

Given that the package contains 4.25 grams of Kool Aid powder, we can calculate the number of moles of Kool Aid powder using its molar mass:

Number of moles of Kool Aid powder = Mass / Molar mass

= 4.25 g / 342.34 g/mol

≈ 0.0124 mol

Similarly, for the sugar, which has a molar mass of 342.34 g/mol, we can calculate the number of moles of sugar using its mass:

Number of moles of sugar = Mass / Molar mass

= 192.00 g / 342.34 g/mol

≈ 0.5612 mol

Now, to calculate the molarity of the desired Kool Aid solution, we need to determine the volume of water. Given that 1.06 quarts is equal to 1 liter, and we have 2.00 quarts of water, we can convert it to liters as follows:

Volume of water = 2.00 quarts * (1.06 liters / 1 quart)

= 2.12 liters

To find the molarity, we use the formula:

Molarity (M) = Number of moles / Volume (in liters)

Molarity of Kool Aid desired = (0.0124 mol + 0.5612 mol) / 2.12 L

≈ 0.286 M

To prepare 65 mL of the desired molarity, we can use dilution calculations. We need to determine the volume of concentrated solution and the volume of water needed.

Let's assume the concentration of the concentrated Kool Aid solution is C M. Using the dilution formula:

(C1)(V1) = (C2)(V2)where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Given that C1 = C M and V1 = V mL, and we want to prepare a final volume of 65 mL (V2 = 65 mL) with a final concentration of 0.286 M (C2 = 0.286 M), we can rearrange the formula to solve for the volume of the concentrated solution:

(C M)(V mL) = (0.286 M)(65 mL)

V mL = (0.286 M)(65 mL) / C M

So, the amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

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Answer:

4.58×10^3

3.72×10^7

Explanation:

3.8×10^2 =380

+ 4.2×10^3=4200

= 4580 = 4.58×10^3

Answer:

the answer is 2 sig figs

hope this will help you ❤️

The ways that the brightness of the flame can be increased are shown below.

By boosting the airflow into the burner, the flame's brilliance can be improved. Increasing the gas flow rate or changing the air intake valve can do this.

Using a gas that generates a brighter flame, like propane or butane, will increase the brightness of the flame. These gases produce a yellow flame because they have a higher carbon to hydrogen ratio than natural gas.

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The volume of methanol necessary to prepare the antifreeze good for antifreeze solution is 3.2 L

M₁V₁ = M₂V₂

Where

The volume of the methanol necessary to prepare the solution can be obtained as illustrated below:

M₁V₁ = M₂V₂

24.7 × V₁ = 10 × 8

24.7 × V₁= 80

Divide both side by 24.7

V₁ = 80 / 24.7

V₁ = 3.2 L

Thus, the volume of methanol necessary to prepare the antifreeze good for antifreeze solution is 3.2 L

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In Linear molecular geometry, the bond angle is 90°, in trigonal pyramidal geometry, bond angle is 107°, in trigonal planar geometry, bond angle is 120° and in tetrahedral, the bond angle is 109.5°.

In the linear geometry, the central atom has two side atoms attached which are at and bond angle of 180°.

In trigonal pyramidal geometry, the central atom has four side atoms which resembles a pyramid like structure. The bond angle between the two consecutive side atoms is 107°.

In trigonal planar geometry, three atoms are attached on the sides of central atom. The bond angle between these side atom is equal and of 120°.

In Tetrahedral geometry, the central atom and the side atoms makes a triangular prism like structure, the bond angle between side atoms is 109.5°.

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The equations of the lines that bisect the acute angle formed by the lines with the given equations are y - y₁ = m₁/2(x - x₁), and y - y₁ = -m₂/2(x - x₁) where m₁ and m₂ are the slopes of the given lines, and (x₁, y₁) is their point of intersection.

To find the equations of the lines that bisect the acute angle formed by two given lines, we first need to find the angle between the two lines. We can use the formula:

tan θ = |(m₁ - m₂) / (1 + m₁ × m₂)|

where m₁ and m₂ are the slopes of the two given lines.

Once we have the angle θ between the two lines, we can find the angle that each bisector makes with each of the given lines. This angle is simply half of the angle between the two given lines, or θ/2.

Now, we can use the formula tan φ = ±tan(θ/2) to find the slope of each bisector line. The positive sign is used if the bisector is drawn in the acute angle direction, and the negative sign is used if it is drawn in the obtuse angle direction.

Finally, we can use the point-slope form of a line:

y - y₁ = m(x - x₁)

where m is the slope of the bisector line and (x₁, y₁) is the point of intersection of the two given lines (which can be found by solving the system of equations).

So the equations of the lines that bisect the acute angle formed by the lines with the given equations are:

y - y₁ = m₁/2(x - x₁) and y - y₁ = -m₂/2(x - x₁)

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Answer:

Define Transportation in plants: Transportation in plants is when the plant transports water and other mineral throughout the whole plant from the roots to the stem and finally specific parts of a plant.

Define Respiration In Plants: Is when plants use photosynthesis to make their own food to make energy for the plant's growth

Answer:

3

Explanation:

Answer:

One of the purposes of the Marshall Plan was to aid nations in economic recovery from WWII.

Explanation:

The Marshall Plan aided the defeated Axis powers because that's one of the reasons it was created, The Marshall Plan was supposed to rehabilitate the economies of the 17 western and southern European countries in order to create stable conditions for democracy to continue.

Answer:

It depends on its mass and its chemical composition. Give me Brainiliest

Barium, nitrogen, hydrogen, and oxygen are the four elements found in the chemical equation given in the question.

An element is a pure substance that cannot be transformed into simpler compounds through any physical or chemical process. The atoms that make up an element are all of the same kind. There are three categories for elements: metals, nonmetals, and metalloids. The symbols used to symbolize different elements in the given equation is Ba (barium), N (Nitrogen), O (oxygen), and H (hydrogen). The reaction is:

Ba₃N₂ + 6H₂O → 3Ba(OH)₂ + 2NH₃

Chemical reaction is the transformation of one or more chemical reactants into one or more distinct products. Chemical elements or chemical compounds make up substances. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.

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Answer:

3 and 6 (weight change and nothing changes)

Explanation:

Hi there!

A chemical change is a change when matter changes into a new substance and has a new chemical property.

The signs that a chemical change is taking place are:

1. change in color

2. change in smell

3. change in energy (for example, there is a change in temperature (thermal energy))

4. a gas is formed (fizzing/bubbling/foaming are signs of this!)

5. formation of a solid (a precipitate)

A physical change is any change to the size, shape, or state of a substance. The substance still has the same chemical property.

these are your eight options:

1. tarnished is formed (a sign of a chemical change; a change in color)

2. gas is produced (a sign of a chemical change)

3. weight change (NOT a sign of a chemical change. Even though the weight changed, the substance still has the same chemical composition and therefore, there wasn't any change to its chemical identity)

4. Temperature change (a sign of a chemical change; a change in energy)

5. color change (a sign of a chemical change)

6. nothing changes (NOT a sign of a chemical change. If nothing happens, the substance is still the same as it was originally and there was no change to its chemical identity.)

7. forms a precipitate (a sign of a chemical change)

8. energy is released (a sign of a chemical change)

therefore the two options that are NOT a sign of a chemical change are 3 and 6 (weight change and nothing changes)

Hope this helps! :)

The energy of a photon that has a frequency of 2.3 x 10¹⁴ Hz is 1.524 × 10-¹⁹J

HOW TO CALCULATE ENERGY OF A PHOTON:

E = hf

Where;

E = energy of photon (J)

h = Planck's constant (6.626 × 10-³⁴J)

f = frequency of photon (Hz)

E = 6.626 × 10-³⁴ × 2.3 × 10¹⁴

E = 15.24 × 10-³⁴+¹⁴

E = 15.24 × 10-²⁰J

E = 1.524 × 10-¹⁹J

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