Determine the electron-group arrangement, molecular shape, and ideal bond angle(s) for each of the following:
(b) NO²⁻

Answer:

Zebra- consumer

Tiger- consumer

Worm- decomposer

Tree-Producer

Molded bread- decomposer

Plant- producer

Answer:

Explanation:

Dandelion plant produces light and feathery seeds .

Zebra consumes / eats grass so it is a consumer .

The student failed to rinse a wet burette with a small amount of base before starting a titration. The student would need more titrant (base) to neutralize the acid than if they had rinsed the burette before starting the titration.

The reason for this is that when a wet burette is not rinsed with the titrant, the remaining water in the burette can dilute the titrant, thereby decreasing its concentration. If the titrant is diluted, more of it would be required to neutralize the same amount of acid. This would result in a titration that requires more titrant (base) to neutralize the acid than if the burette had been properly rinsed with the base.
In other words, not rinsing the burette with a small amount of base can affect the accuracy of the titration results. It is, therefore, important to properly rinse the burette with the titrant before starting a titration to avoid diluting the titrant and ensure accurate titration results.
In conclusion, more titrant (base) would be required to neutralize the acid if a wet burette is not rinsed with a small amount of base before starting a titration. It is essential to rinse the burette before starting a titration to avoid dilution of the titrant and ensure accurate titration results.

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Answer:

Explanation:

Helium (He) is similar in that it, too, only has room for two electrons in its only valence shell. Hydrogen and helium have only one electron shell. The first shell has only one s orbital and no p orbital, so it holds only two electrons. Therefore, these elements are most stable when they have two electrons.

Answer:

The heat and light released by fire comes from the breaking of chemical bonds. ... The mass of each molecule, before burning, exceeds the total mass of its atoms by a tiny amount that is equivalent (through E=mc²) to the total energy of all its atomic bonds.

Explanation:

I hope this helps (:

Traits for larger animals with big horns will be selected.

The two liquids made a new substance.

A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity.

A chemical change occurs when some substances are transformed into different substances, with different nature and properties. In this case when both liquids are mixed a solid is formed.  This is an example of a change of state of the liquids reactants to the solid product, which has properties and characteristics different from that of the initial liquids of the mixture which is called a chemical change.

Hence, option D is correct.

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Answer:

(a) Eka-aluminum and gallium are two names of the same element as Eka-Aluminium has almost exactly the same properties as the actual properties of the gallium element. The properties: atomic mass, density, melting point, formula of chloride and formula of oxide are almost the same.

Explanation:

Scandium - Eka boron.

      (ii) Gallium - Eka aluminium.

      (iii) Germanium - Eka silicon.

Radiation is the emission and propagation of energy in the form of waves, rays, or particles. There are three main types of radiation Non-ionizing radiation , Ionizing radiation, and Neutrons.

Non-ionizing radiation is the release of energy from the lower-energy region of the electromagnetic spectrum. Ionizing radiation is radiation with sufficient energy to remove an electron from an atomic orbital, forming an ion. Neutrons are particles found in the atomic nucleus.

Radiation includes the emanation of any portion of the electromagnetic spectrum, plus it includes the release of particles. An example is a burning candle that emits radiation in the form of heat and light. Radiation is the release of energy, whether it takes the form of waves or particles. Radioactivity refers to the decay or splitting of an atomic nucleus. A radioactive material releases radiation when it decays.

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Answer:

Electric Patterns and has many different variations.

Explanation:

Google

Answer:

18.0 g

Explanation:

M(H2) = 2.0 g/mol

32.0g * 1 mol/2 g= 16 mol H2

M(O2) = 32 g/mol

16.0 g * 1mol/32 g= 0.5 mol O2

                                      2H2 + O2 ---> 2H2O

from reaction              2 mol    1 mol

given                         16 mol     0.5 mol

We see that O2 is a limiting reactant.

                                    2H2 + O2 +-------> 2H2O

from reaction                         1 mol            2 mol

given                                      0.5 mol        x mol

x =(0.5*2)/1= 1 mol H2O

M(H2O)= 18 g/mol

18 g/mol* 1 mol = 18 g H2O

The question presents a table with many multiplications using different units (mass and velocity) and requires us to decide whether the operations presented are possible.

To solve this question, we should keep in mind this general rule: for units reffering to the same measurement (for example: mass, volume, distance etc.), we are able to multiply the units as long as they are the same. For example: g x g, L x L, m x m. If units are about the same measurement but still different, we should convert one of them in order to make them the same.

On the other hand, when we are talking about division, if we have the same unit on the operator and denominator position, we will have a result as "1" - then we need to analyze the entire value.

Now, considering the operations presented in the question:

On the first one, we have kg multiplied by kg. Although it isn't usual to see square kg (kg^2), we are able to make this operation:

On the second line, we have square g multiplied by kg. In this case, since the first unit is square, we can assume they are not about the same measurement. Thus, we can't complete this operation.

On the third line, there is a division and we should proceed as a normal operation (although the unit km/s isn't usual):

In summary, the answers should be:

1) Is it possible? YES / Result = 45 kg^2

2) Is it possible? NO

3) Is it possible? YES / Result = 0.8 km/s

Answer:

12341 in standard form = 1.2341 × 10⁴

Explanation:

When you split the number 12341 into a coefficient and a power of 10 you do get 12341 in exponential form, but there is an indefinite number of possibilities.

As you probably want 12341 in normalized scientific notation, the coefficient or significand of 12341 in scientific notation must be in the interval [1,10[.

As there are many ways to express 12341 in scientific notation, in this post we mean 12341 in normalized scientific notation, unless stated otherwise. Therefore:

12341 in scientific notation = 1.2341 × 10⁴.

This can also be expressed as 1.2341 × 10⁴, using the caret symbol, or as 1.2341e+4, which is called 12341 in e-notation.

Answer:

5

Explanation:

because 2 box is close mark brainlist plss

Answer:

5th fill first....

hope it's help you

Lactic acid fermentation is not a reasonable long-term solution to a lack of oxygen because it is an inefficient process in terms of energy production and can lead to the accumulation of lactic acid.

During lactic acid fermentation, glucose is converted into lactic acid in the absence of oxygen. This process allows for the regeneration of NAD+ to sustain glycolysis, which is the primary pathway for ATP production in the absence of oxygen. However, lactic acid fermentation produces only a limited amount of ATP compared to aerobic respiration, which is the process that occurs in the presence of oxygen.

Additionally, lactic acid buildup can lead to a decrease in intracellular pH, causing acidification of the cells. This acidic environment can negatively impact cellular processes and potentially lead to cell damage. The accumulation of lactic acid also limits the ability of cells to perform essential functions, including muscle contraction.

In contrast, aerobic respiration, which occurs in the presence of oxygen, is a much more efficient process for ATP production. It generates a significantly higher amount of ATP per glucose molecule compared to lactic acid fermentation. Therefore, in the long term, relying solely on lactic acid fermentation would result in reduced energy production and potential harm to cellular function.

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Answer:

In the process of baking bread, the chemical reaction happens because by consuming the sugar, the yeast has created new substances—carbon dioxide and ethanol.

Explanation:

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Answer:

the stem

Explanation:

yjsbsksvznzbfb

The chemical formula for the compound containing 8.6 mol of sulfur and 3.42 mol of phosphorus is P₂S₅

From the question given above, the following data were obatined:

The chemical formula of the compound can be obtained as follow:

Divide by their molar mass

S = 8.6 / 32 = 0.26875

P = 3.42 / 31 = 0.11032

Divide by the smallest

S = 0.26875 / 0.11032 = 2.44

P = 0.11032 / 0.11032 = 1

Multiply by 2 to express in whole number

S = 2.44 × 2 = 5

P = 1 × 2 = 2

Thus, the chemical formula is P₂S₅

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Answer:

Its Hydrogen

Explanation:

Answer:

A. The birthrate is higher than the death rate

Explanation:

The correct answer is B. calcium, magnesium, and phosphorus. These three minerals are essential for bone health and maintenance. Calcium is the primary mineral that provides strength and structure to bones.

Magnesium is important for the activation of enzymes involved in bone metabolism and is also required for the proper utilization of calcium. Phosphorus is another crucial mineral that makes up a significant portion of the mineralized matrix of bones. Together, these three minerals play a vital role in maintaining healthy bones.

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NaHSO4 <NH4NO3<NaHCO3<Na2CO3 salt solutions in order of increasing ph (lowest ph at the top of the list).

The pH scale determines how basic or acidic aqueous or other liquid solutions are. The expression converts the hydrogen ion concentration, which typically ranges between 0 and 14, into values between 1 and 1014 gram-equivalents per litre. It is widely employed in the fields of biology, agronomy, and chemistry. Because it has a pH of 7, or 107 gram-equivalents of hydrogen ions per litre, pure water is neutral (neither acidic nor alkaline).

In an aqueous solution, the amount of hydrogen ions expressed in equivalents per litre is equal to log(H+). Since it indicates which crops will thrive there, a soil's pH is probably the most significant factor affecting its moisture content in agriculture.

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Thermal energy always moves from higher energy area to lower energy area over a temperature gradient.

Thermal energy is a form of energy by virtue of temperature of a body. As the temperature of a body increase its thermal energy increases. Thermal energy or heat energy transfers though medium and vacuum from higher energy area to lower energy area.

Heat transfer can be through conduction in solids, convection in fluids and by radiation through space. In conduction, the thermal energy easily transfers through a chain of close packed molecules.

In all these mode of heat transfer heat energy is flowing from a hotter region to a colder region.

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Answer:

you can explore the structure of atoms as you add protons, neutrons, or electrons to a model and the name of the element you have created

Explanation:

The electron configuration of a potassium atom at ground state is 1s²2s²2p⁶3s²3p⁶4s¹. Therefore, option D is correct.

The electron configuration of an element can be explained as electrons being occupied in different energy levels of an atom of a specific element. In the electron configuration, the electrons are usually written as a superscript of atomic subshells. For example, the electron configuration of Helium can be represented as 1s²2s².

The sequence of completely filled subshells similar to neighboring the electronic configuration of a noble gas is represented by square brackets. The principal quantum number (n) will be used to denote the maximum number of electrons in an electron shell.

The total number of electrons occupied in the given electronic configuration  1s²2s²2p⁶3s²3p⁶4s¹  is 19. The atomic number of potassium is 19 therefore it is the configuration of potassium.

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Soap is potassium or sodium salts of a carboxylic acid attached to a long aliphatic chain. Detergent is the potassium or sodium salts of a long alkyl chain ending with a sulfonate group.

There are a total of 38 atoms in the compound 4(NH3)2NO2.

To determine the number of atoms in the given compound, we first need to break down the formula and identify the number of atoms in each element.

The formula is 4(NH3)2NO2, which can be written as:

4 x 2(NH3) + 1 x 2(NO2)

Each molecule of NH3 contains

Each molecule of NO2 contains

Therefore, the total number of atoms in the given compound is:

4 x 2 x (1 nitrogen atom + 3 hydrogen atoms) + 1 x 2 x (1 nitrogen atom + 2 oxygen atoms)

= 4 x 2 x 4 + 1 x 2 x 3

= 32 + 6

= 38

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Under pressure, oxygen is contained in oxygen cylinders, and as the cylinder is used down, the pressure gauge steadily decreases.

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After considering the given data we conclude that the answers for the given sub questions are
a) the mass of zinc sulfide that is dissolved in 150 mL of a saturated solution is \(2.0*10^{-12} grams\).
b) the mass of manganese(II) hydroxide that is dissolved in 175 mL of a saturated solution is \(1.9*10^{-4} grams\).

(a) To calculate the mass of zinc sulfide that is dissolved in 150 mL of a saturated solution, we can use the Ksp value for zinc sulfide, which is \(2.0*10^{-25}\). The molar solubility of zinc sulfide can be calculated using the Ksp value as follows:
\(Ksp = [Zn^{2+} ][S^{2-} ] = (x)(x) = x^2\)
\(x = \sqrt(Ksp) = \sqrt(2.0*10^{-25} ) = 1.4*10^{-13} M\)
The number of moles of zinc sulfide dissolved in 150 mL of the saturated solution is:
\(n = M *V = (1.4*10^{-13} mol/L) *0.150 L = 2.1*10^{-14} mol\)
The mass of zinc sulfide dissolved in 150 mL of the saturated solution is:
\(mass = n * molar mass = (2.1*10^{-14} mol) * (97.47 g/mol) = 2.0*10^{-12} g\)
The mass of zinc sulfide dissolved in 150 mL of the saturated solution is:
\(mass = n * molar mass = (2.1*10^{-14} mol) *(97.47 g/mol) = 2.0*10^{-12} g\)
Therefore, the mass of zinc sulfide that is dissolved in 150 mL of a saturated solution is \(2.0*10^{-12} grams.\)
(b) To calculate the mass of manganese(II) hydroxide that is dissolved in 175 mL of a saturated solution, we can use the Ksp value for manganese(II) hydroxide, which is \(4.5*10^{-14}\). The molar solubility of manganese(II) hydroxide can be calculated using the Ksp value as follows:
\(Ksp = [Mn^{2+} ][OH^{-} ]^2 = (x)(2x)^2 = 4x^3\)
\(x = (Ksp/4)^{(1/3)} = (4.5*10^{-14} /4} )^{(1/3)} = 1.2*10^{-5} M\)
The number of moles of manganese(II) hydroxide dissolved in 175 mL of the saturated solution is:
\(n = M * V = (1.2*10^{-5} mol/L) * 0.175 L = 2.1*10^{-6} mol\)
The mass of manganese(II) hydroxide dissolved in 175 mL of the saturated solution is:
\(mass = n *molar mass = (2.1*10^{-6} mol) * (88.94 g/mol) = 1.9*10^{-4} g\)
Therefore, the mass of manganese(II) hydroxide that is dissolved in 175 mL of a saturated solution is \(1.9*10^{-4} grams.\)
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The complete question is
(a) The mass of zinc sulfide that is dissolved in 150 mL of a saturated solution is _____ grams.

(b) The mass of manganese(II) hydroxide that is dissolved in 175 mL of a saturated solution is____ grams.

ksp for zinc sulfide is 2.0x10-25
ksp for manganese hydroxide is 4.5x10-14