True or False questions
• Please answer the following questions
1. Water is released from plants & animals
False
—
2.
Water contains 2 atoms or oxygen
3.
Water is found in plants but not in meats
4.
Water can dissolve many substances​

Neutral lithium is oxidized and changed into Li+ at the anode. When the electrons from the anode reaction are received at the cathode, this causes the reduction of Co(IV) to Co(III).

The biological aerobic system (BOD) of wastewater is decreased after oxidation, which also lessens some contaminants' cytotoxicity. Some contaminants undergo this treatment and are transformed into dioxide, water, and sludges. Disinfection is commonly accomplished using chemical oxidation.

The reaction brought on by coming into touch with oxygen molecules is known as oxidation. These materials can be non-metals like live tissues or metals. Technically speaking, oxidation is the removal of one electrons during the phase of interaction between two or more atoms.

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Answer:

In our head there is skull and inside the skull there is our brain.

Answer:

Both brain and skull is inside our head. If you meant like really inside, then the brain will be the most appropriate answer. Actually, inside our head, there is the skull and inside our skull is the brain.

The grignard reagent is shown in the figure below:

Grignard reagents have many fascinating reactions with different functional groups including: aldehydes, ketones, formaldehyde, carboxylic acid derivatives, and epoxides. Because of their nucleophilicity, Grignard reagents attack easily with a variety of carbonyl compounds. The first example of this is the aldehyde. The Grignard reaction is an organic reaction used to produce a variety of products through the reaction. Therefore, they display qualities that are also exhibited by organolithium reagents and the two reagents are considered similar. When the alkyl group attached to a Grignard reagent is replaced by an amide group, the resulting compound is called a Hauser base.

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Answer :Because the quantities of phosphorus in soil are generally small, it is often the limiting factor for plant growth. That is why humans often apply phosphate fertilizers on farmland. Phosphates are also limiting factors for plant-growth in marine ecosystems, because they are not very water-soluble.

Explanation:

The scientific notation : A. 9.594 x 10⁻³

Scientific Notation consists of 2 parts  

1. the first part: the first digit followed by the decimal point  

2. The second part: the power of 10 (the exponents).which shows the number of digits after the decimal point

Multiply scientific notation :

1. multiply coefficients

2. add the exponents.

3. converted to scientific notation.

3.120 x 10⁻⁷ x 3.075 x 10⁴ =

\(\tt 3.120\times 3.075=9.594\)

\(\tt 10^{-7}\times 10^4=10^{-7+4}=10^{-3}\)

\(\tt 9.594\times 10^{-3}\)

If a second-period diatomic molecule has 16 electrons in its valence shell (total of 2s and 2p electrons), the predicted bond order of the molecule would be 2

Number of bonding electrons= 10

Number of antibonding electrons= 6

Bond order = (10−6)/2

∴ Bond order = 2

What is bond order?

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Answer:

Answer: Fractional Distallation

Explanation: this technique relies on the compounds of the mixture. This is able to happen when there is diffrent boilling points.

By the process of natural selection, individuals in Finch 1 will evolve over time to resemble individuals in Finch 2.

Natural selection is the process by which individuals who possess certain features or structures that make them better suited to their environment are able to survive and reproduce in their environment while those who do not have such features die off.

Since the preferred food for Finch 1 has become scarce due to drought, individuals in Finch 1 who have features that enable them eat larger seed will be naturally selected for survival , most population in Finch will be composed of such individuals.

Therefore, natural selection will cause individuals in Finch 1 to evolve over time to resemble individuals in Finch 2.

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Answer:

The first one

Explanation:

Hope it helps

Answer:

I think it would be: have starting substances that collide with each other

Explanation:

Two or more reactants interact to create different substances called products.

Answer:

Explanation:

not sure what 10# is

but you solve this way

(2.5 X 10 #) divide by (6.02 X 10^23)  X 28 g

6.02 x 10^23  is avogadros number use cause its in molecules

28 is the molar mass from the periodic table for CO

if I calculate it with 2.5 X 10 this is the answer  1.16 X 10^-21 g CO

Answer:

D- Arsenic (As)

don’t fail pls :) ✨

The Arsenic (As) element's symbol could replace the question mark in the diagram. Therefore, option D is correct.

An electron dot diagram is a diagram used to represent the valence electrons of an atom in a simple way. Valence electrons are the electrons in the outermost shell of an atom, which are involved in chemical bonding.

In an electron dot diagram, the symbol of the element is used to represent the nucleus and inner electrons of the atom, and dots are placed around the symbol to represent the valence electrons. Each dot represents one valence electron, and the dots are placed on each of the four sides of the symbol (top, bottom, left, and right) before doubling up.

Thus, the Arsenic (As) element's symbol could replace the question mark in the diagram. Therefore, option D is correct.

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Your question is incomplete, most probably the full question is this:

Which element’s symbol could replace the question mark in the diagram?

boron (B)

neon (Ne)

rubidium (Rb)

arsenic (As)

The number of s orbitals present in one energy level of an atom is 1. There can be only one s orbital present in a single energy level.

What is an s orbital?

An s-orbital is a region of space around the nucleus where an electron is most likely to be found. An s-orbital is a spherical shape that is symmetrical around the nucleus of an atom.

What is an energy level?

An electron shell is another name for an energy level. It's a portion of an atom where electrons are found. Electrons, which are negatively charged, are constantly moving around the nucleus of an atom in energy levels. Electrons that are farther away from the nucleus are located in higher energy levels.

What is an electron configuration?

The arrangement of electrons in an atom is referred to as its electron configuration. In terms of electron shells, subshells, and orbitals, it reveals how the electrons are arranged.

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The correct statement regarding a solution with a pH of 4 is: (A) It has 100 times fewer H⁺ ions than a solution with a pH of 2.

The pH scale is a logarithmic scale that measures the concentration of hydrogen ions (H⁺) in a solution. As the pH decreases, the concentration of H⁺ ions increases. Each unit change in pH represents a tenfold difference in H⁺ ion concentration. Therefore, a solution with a pH of 4 has 100 times fewer H⁺ ions compared to a solution with a pH of 2.

Option B is incorrect because a solution with a pH of 4 has fewer H+ ions than a solution with a pH of 6, not 100 times fewer.

Option C is incorrect because a solution with a pH of 4 has fewer H+ ions than a solution with a pH of 2, not 100 times more.

Option D is incorrect because a solution with a pH of 4 is considered acidic, not basic. Basic solutions have pH values greater than 7.

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Complete question :

A solution with a pH of 4 a A. has 100 times fewer H ions than a solution with a pH of 2 а OB. has100 times fewer H+ ions than a solution with a pH of 6 C. has 100 times more H+ ions than a solution with a pH of 2 is basic a OD.

Answer:

(e) 1

Explanation:

Each atom has some energy levels and each energy level requires an electron to have certain amount of energy to reside in that energy level. Similarly, in order to excite the hydrogen atoms to a state n =6, its electrons must be provided a certain amount of energy that is constant. This energy is provided in form of photons. These photons have a constant wavelength as a result of constant energy. So, when these electrons go back to the ground state, they emit photons of same wavelength to release the energy they absorbed. Hence, only 1 wavelength is produced when atoms relax to their ground state from n = 6.

Therefore, the correct answer will be:

(e) 1  

Answer:

cell membrains

Explanation:

The first ionization energy of lithium (Li) corresponds to the reaction where a lithium atom loses one electron to become a lithium ion. The chemical equation for this reaction is:

Li(s) → Li⁺(g) + e⁻

In the case of lithium, the first ionization energy refers to the energy required to remove one electron from a neutral lithium atom to form a lithium ion with a positive charge.

The equation for the first ionization energy of lithium shows that a lithium atom in its solid state loses an electron to form a positively charged lithium ion in the gaseous state. This process requires energy to overcome the attractive forces holding the electron in the atom.

The first ionization energy is an important property of elements and is a measure of their tendency to lose electrons.

Elements with high first ionization energies are less likely to lose electrons and form positive ions, whereas elements with low first ionization energies are more likely to lose electrons and form positive ions.

In the case of lithium, it has a relatively low first ionization energy compared to other elements, which means it is relatively easy for a lithium atom to lose an electron and form a positively charged ion.

This property makes lithium a good candidate for use in batteries and other energy storage devices.

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Answer:

C stay away from trees, water, and tall objects.

Explanation:

took the quiz and got it right :)

A person trapped outside during a thunderstorm should stay away from the following:

This is defined as a rain shower during which you hear thunder with a corresponding lightning.

It is best to avoid trees, water, and tall objects during thunderstorms to prevent accidents and death.

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To make 575 ml of a 35% Na2CO3 working solution from a 5M Na2CO3 stock solution, you would need to measure 379.2 ml of the 5M Na2CO3 stock solution. this can be found by using dilution calculations.

To make 575 ml of a 35% Na2CO3 working solution from a 5M Na2CO3 stock solution, you will need to measure a certain volume of the stock solution and dilute it with a calculated amount of water. First, let's calculate the amount of Na2CO3 in the working solution. The desired concentration is 35%, which means the solution will contain 35 grams of Na2CO3 per 100 ml.

Therefore, for 575 ml of the working solution, the amount of Na2CO3 needed can be calculated as follows:

(575 ml) * (35 g/100 ml) = 201.25 g Na2CO3

Next, we'll determine the volume of the stock solution needed. Since the stock solution is 5M, it means that for every 1 liter (1000 ml), it contains 5 moles of Na2CO3.

To find out how many moles are needed for 201.25 g of Na2CO3, we divide the mass by the molar mass of Na2CO3 (105.99 g/mol):

(201.25 g) / (105.99 g/mol) = 1.896 mol Na2CO3

Now, we can use the molarity formula (M1V1 = M2V2) to calculate the volume of the stock solution needed.

(5 M) * (V1) = (1.896 mol)

V1 = (1.896 mol) / (5 M) = 0.3792 L = 379.2 ml

So, you would need to measure 379.2 ml of the 5M Na2CO3 stock solution.

To prepare the working solution, add this volume of the stock solution to a container, and then add water to reach a total volume of 575 ml. Ensure thorough mixing to obtain a homogeneous 35% Na2CO3 working solution.

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Answer:

Cause and effect, easy.

Answer: 1.76 M

Explanation:

To calculate the number of moles for given molarity, we use the equation:

\(\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in L)}}\)     .....(1)

Molarity of \(NaNO_3\) solution = 0.35 M

Volume of solution = 125 mL

Putting values in equation 1, we get:

a) \(0.35M=\frac{\text{Moles of}NaNO_3\times 1000}{125ml}\\\\\text{Moles of }NaNO_3=\frac{0.35mol/L\times 125}{1000}=0.044mol\)

1 mole of \(NaNO_3\) contains = 1 mol of \(NO_3^-\)

Thus \(0.044mol\) of \(NaNO_3\) contain= \(\frac{1}{1}\times 0.044=0.044\) mol of \(NO_3^-\)

b) \(1.1M=\frac{\text{Moles of}Mg(NO_3)_2\times 1000}{450ml}\\\\\text{Moles of }Mg(NO_3)_2=\frac{1.1mol/L\times 450}{1000}=0.495mol\)

1 mole of \(Mg(NO_3)_2\) contains = 2 mol of \(NO_3^-\)

Thus \(0.495mol\) of \(Mg(NO_3)_2\) contain= \(\frac{2}{1}\times 0.495=0.99\) mol of \(NO_3^-\)

Total \([NO_3^-]=\frac {\text {total moles}}{\text {total volume}}=\frac{0.044+0.99}{0.575L}=1.76M\)

Thus \([NO_3^-\) after mixing is 1.76 M

Ion channels that open and close in response to a change in membrane potential are called voltage-gated ion channels.

Voltage-gated ion channels are a specialized type of membrane protein that are embedded in the lipid bilayer of excitable cells. They have a pore that allows ions to flow through, and they can be selective for different types of ions, such as sodium (Na+), potassium (K+), or calcium (Ca2+).

The opening and closing of the channel's pore is controlled by changes in the membrane potential, which is the difference in electrical charge across the cell membrane.

These channels are crucial for the generation and propagation of electrical signals in excitable cells, such as neurons and muscle cells. Voltage-gated ion channels are capable of detecting small changes in membrane potential and responding by opening or closing their pore, allowing ions to flow across the membrane and alter the electrical state of the cell.

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If a non-volatile sugar is  added to water , the vapor pressure of liquid will tend to decreases and this reduction of vapor pressure is said to be proportional to the numbers of mole fraction of solute that was added to it.

In the case above,  the vapor pressure of the solution is known to be lowered if compared to the vapor pressure of the pure solution.

Therefore if a non-volatile solute is said to be place or added to a pure solution such as water, the vapor pressure of the solution will be reduced than that of the pure solution.

Hence, the statement that If a non-volatile sugar is  added to water , the vapor pressure of liquid will tend to decreases and this reduction of vapor pressure is said to be proportional to the numbers of mole fraction of solute that was added to it is correct.

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The equation which balances the given chemical reaction between magnesium and oxygen is 2Mg + O₂ → 2MgO.

Balanced equations are those equations in which each entities present in reactant side as well as on product side is equal.

Given chemical reaction:

Mg + O₂ → MgO

Above reaction is not balanced as number of oxygens are not equal on both sides.

This is not a balanced equation as number of magnesium atom is not equal.

This is also not a balanced equation as oxygen atoms are not equal on both sides.

This is a balanced equation as number of each atoms are equal on both sides.

This is not a balanced equation as number of magnesium atom is not equal.

Hence balanced equation is 2Mg + O₂ → 2MgO.

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Answer:

2326 J

Explanation:

93-55

You get the temperature increased.

Then the answer (x)

Mass *(x) *specific heat

To obtain a **1H NMR spectrum** for your product, dissolve ~10 mg of the substance in **700 microliters** of CDCl3, then place the solution in an NMR tube for analysis.

In this procedure, you first need to dissolve the product in a deuterated solvent, in this case, CDCl3 (chloroform-d). The reason for using a deuterated solvent is to avoid interference from solvent signals during the NMR analysis. After dissolving the product, carefully transfer the solution to an NMR tube, ensuring that it is free of air bubbles. Finally, insert the NMR tube into the NMR spectrometer and run the experiment to obtain the proton (1H) NMR spectrum. This spectrum will provide valuable information about the structure and chemical environment of the hydrogen atoms in your product.

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