suppose a student starts with 2.3621 g of a sand mixture and separates the components into 1.3012 g of n a c l , 0.5560 g of s i o 2 , and 0.4503 g of c a c o 3 . based on the amount of recovered s i o 2 , what is the percent of s i o 2 in the starting mixture?

a) 25.0 mL of the compound has a mass of 17.95 g.

b) The cost of this amount of the compound is $31.43 ($1.75 x 17.95 g).

The answer to your question the equation of the line BC is C \(-7x - 5y = -48\)

Since AB and BC form a right angle at point B, it means that AB is perpendicular to BC.

To find the equation of BC, we first need to find the gradient of BC.

Let m be the gradient of AB and m' be the gradient of BC, since AB is perpendicular to BC, mm' = -1. Thus m' = -1/m

So, we need to find the gradient of AB and thus find the gradient of BC.

To find the gradient of AB, we use the equation for the gradient of a line in slope-point form. Having point A = (x₁, y₁) = (-3, -1) and point B = (x₂, y₂) = (4, 4).

\(m = \frac{y_{2} - y_{1} }{x_{2} - x_{1}}\)

Substituting the values of the variables into the equation, we have

\(m = \frac{4 - (-1) }{4 - (-3)}\)

\(m = \frac{4 + 1 }{4 + 3}\)

\(m = \frac{5}{7}\)

Since m' = -1/m

m' = -1 ÷ 5/7

m' = -7/5

Since we know the gradient of the line BC and the line BC passes through the point B = (4, 4) = (x₂, y₂) we find the equation of the line BC using the equation of a line in slope-point form.

\(m' = \frac{y - y_{2} }{x - x_{2}}\)

\(-\frac{7}{5} = \frac{y - 4 }{x - 4}\)

cross-multiplying, we have

\(-7(x - 4) = 5(y - 4)\)

Expanding the brackets, we have

\(-7x + 28 = 5y - 20\)

Subtracting 28 from both sides, we have

\(-7x = 5y - 48\)

Subtracting 5y from both sides, we have

\(-7x - 5y = -48\)

So, the equation of the line BC is \(-7x - 5y = -48\)

The answer to your question the equation of the line BC is C \(-7x - 5y = -48\)

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Answer:

its C

Explanation:

Answer:

Carbonic acid in ocean waters dissolves calcium carbonate that forms coral reefs.

Explanation:

I took the quiz and got it right

The acid rain is toxic to vegetation and aquatic life. The elements like calcium or magnesium can act as the buffer which neutralize the acid rain.

The normal pH of rain water is 5.6 due to the formation of H⁺ ions from the reaction between CO₂ and water. When it drops below 5.6, it is called acid rain. Leather, paper, etc. are disintegrated by the acid rain.

The oxides of sulphur and nitrogen, phosphoric acid present in the polluted air dissolve in rain water making it more acidic. SO₂ and NO₂ are the major contributors of acid rain.

The rocks with high amounts of calcium like limestone and dolomite are effective in lowering the acidity of water from precipitation which infiltrates underground. In places with soils having calcium, the effect of acid rain can be held by keeping the pH of ground water to remain near neutral or alkaline.

Thus limestone neutralize acid rain.

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Answer:

Carbon:  14

Oxygen: 16

Nitrogen: 15

Sulpher: 16

From the given SN1 reaction (picture attached), the major organic product will be 3-ethylpentan-3-ol, the nucleophile, substrate, leaving group, and the rate-limiting step is identified in the attachment.

In the given reaction an alkyl halide 3-bromo-3-ethylpentane is used as a substrate. In the first step of the reaction, alkyl halide dissociates and a carbocation with a Bromide ion generates. The first step of the reaction mechanism is the slow and rate-determining step. In the first step, 3-bromo-3-ethylpentane is the substrate and bromide is the leaving group. In the second step, the water molecule acts as a nucleophile and attacks carbocation. In the final step, bromide removes hydrogen from the water molecule, and the product results.

The complete question and reaction mechanism are attached as a picture.

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Water does  not stick to the leaves of the plant  owing to the fact that the leaves has a waterproof cuticle.

We know that the leaves are the parts of the plant that are involved in photosynthesis. Photosynthesis is the process by which green plants produce their own food in the presence of sunlight and chlorophyll. We know that the leave has an outer protective covering.

The tissue that plays this outer covering of a plant for is the  epidermis and its waxy cuticle. It prevents damage to the plant.

Water does  not stick to the leaves of the plant  owing to the fact that the leaves has a waterproof cuticle.

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The molarity of the KOH solution is 0.0707 M.

In a neutralization reaction between H2SO4 and KOH, the number of moles of H2SO4 equals the number of moles of KOH.

First, let's calculate the number of moles of H2SO4:

moles of H2SO4 = volume of H2SO4 (in L) x molarity of H2SO4

moles of H2SO4 = 10.0 mL x (1 L/1000 mL) x 0.121 mol/L

moles of H2SO4 = 0.00121 mol

Since KOH and H2SO4 react in a 1:1 molar ratio, the number of moles of KOH is also 0.00121 mol.

Next, let's calculate the molarity of the KOH solution:

molarity of KOH = moles of KOH / volume of KOH (in L)

molarity of KOH = 0.00121 mol / (17.1 mL x 1 L/1000 mL)

molarity of KOH = 0.0707 mol/L or 0.0707 M

Therefore, the molarity of the KOH solution is 0.0707 M.

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Answer:

Melting

Explanation:

Once heat is added it will turn to a liquid

Melting is the process of turning solid to liquid.

The correct chemical formula for nitrogen gas is N2. For example, "Nitrogen gas is one of the diatomic elements, in which one molecule consists of two atoms of the same element bonded by one or more covalent bonds."

For even mass numbers and even atomic numbers, the neutral atom is a boson. For odd mass numbers and odd atomic numbers, the neutral atom is a fermion.

A.) Boson is a particle with an integer spin value. A fermion is a particle with half-integer spin value.

B.) The neutron's discovery was crucial to our current understanding of the atomic nucleus. A nucleus that consisted only of protons and electrons would be difficult to explain and would most likely be unstable. Electrons cannot exist in the nucleus because their kinetic energy is much greater than the strong nuclear force that binds the nucleus.

C.) The annihilation of a proton-antiproton pair into π0π0 pairs is a strong interaction. The strong force between the proton-antiproton pair causes their annihilation, resulting in the creation of π0π0 pairs.

D.) To determine whether the spherical harmonic Y11 is an eigenfunction of parity, we can first evaluate the function when x is inverted to -x.

When θ is replaced with π - θ and ϕ is replaced with ϕ + π, the function changes as follows:

Y1'1(θ,ϕ)=-Y11(π-θ,π+ϕ)

=-8π/3 sin(π-θ) e^i(π+ϕ)

=8π/3sinθeiϕ

Therefore, since Y11'=-Y11, the eigenvalue of the parity transformation is P=-1.

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Answer:

CH4, methane

Explanation:

CH4 has 1 C (carbon) and 4 H (hydrogen) atoms, for a total of 5 atoms in one molecule.

The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

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Answer:

No, Micah is not correct. Since there are equal numbers of people in each group who drive and who do not drive, the relative frequency for each is 50%. Because the relative frequencies are the same, there is no association   between the variables.

Explanation:

Answer:1.2 picoseconds

Explanation:

Answer:

A

Explanation:

Hopefully this helps.

Answer:

i think it is b im not sure

Explanation:

Aerobic organisms must have oxygen in order to develop, breathe, metabolize, and use other vital routes. At the end of the electron transport chain during respiration in these organisms.

oxygen acts as an electron acceptor. Hence, when an obligatory aerobe is incubated in anaerobic conditions, they are unable to grow because there is no oxygen present, which in turn restricts its respiration and metabolism.

An electron is a subatomic particle with a negative charge that orbits the nucleus of an atom. It has a relative mass of 9.109 x 10⁻³¹ kg, which is about 1/1836th the mass of a proton. Electrons are responsible for the chemical behavior of atoms, as they are involved in the formation of chemical bonds between atoms. They also play a crucial role in electricity and magnetism, as they are the carriers of electrical charge and can produce magnetic fields. Electrons exist in energy levels around the nucleus, and they can absorb or emit energy to move between energy levels, giving rise to the emission and absorption of light and other electromagnetic radiation. Electrons are also used in various technologies, including electronics, telecommunications, and medical imaging.

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Answer:55ml

Explanation:

Answer:

the blanket let's him slide it across the floor because the has less friction with the floor than the furniture.

Answer:

Blanket underneath the furniture may reduce the kinetic friction

Explanation:

When sliding an object across a surface, the force of kinetic friction will oppose the movement of the object.

By placing a blanket between the object and the surface, the kinetic friction coefficient may be reduced.

Therefore, putting a blanket underneath the furniture may reduce the kinetic friction coefficient, then making it easier to slide the forniture.

(Hi fyi this answer took a lot of time & effort to make sure it was accurate, precise and to the point to be produced, so if you could opt this answer as the brainliest it would mean the world to me,)

Stay positive and Take care,

A fellow mate,

Cheers !

The statement that is a characteristic of water is strong cohesion. Details about characteristics of water can be found below.

Water is a unique molecule which is attributed to its unique characteristics or features.

Water is made up of two hydrogen atoms and one oxygen atom that are chemically bonded to one another.

Some of the characteristics of water are as follows:

Therefore, the statement that is a characteristic of water is strong cohesion.

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Answer: A/B

Explanation:

It is most likely formed from igneous rock that was once buried

Answer: a

Explanation:

Hydration is a specific example of the phenomenon known generally as a. solvation

The act of hydrating involves combining or dissolving an object in water. It is a particular instance of the more general phenomena known as solvation, which is the process by which solvent molecules surround and scatter a solute to create a homogeneous solution. However, hydration explicitly refers to solvation with water as the solvent.

Solvation may also happen with solvents other than water. Solvation is the process through which a solute and solvent interact to stabilise a solute species. Due to its impact on the solubility, reactivity, and behaviour of compounds in solution, solvation is a crucial mechanism in many chemical and biological processes.

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hi <3

i would say the kinetic energy decreases (so option C), as liquid particles are more closely packed than in a gas

hope this helps <3

The solute contained within a supersaturated solution can be rapidly precipitated by adding a seed crystal, or by disturbing the solution in some way, such as stirring or shaking.

This causes the solute to come out of the solution and form solid crystals, resulting in the supersaturated solution becoming saturated. The seed crystal provides a surface on which the solute can start to crystallize, and this initiates the precipitation process. Once the seed crystal is added, the precipitation occurs quickly and can be seen as the solution becomes cloudy or solid particles start to form. The process of rapid precipitation is used in many industrial applications, such as the purification of metals, production of pharmaceuticals, and manufacturing of food products.

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Hydroelectric, wind, solar, and nuclear power stations are not believed to directly impact the global climate because they all use renewable energy resources and do not negatively impact ecosystems.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system.

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The full electron configuration of calcium is: 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2. The electron configuration of an atom describes the arrangement of electrons in its energy levels or orbitals.

Calcium (Ca) is a chemical element with an atomic number of 20, which means it has 20 electrons. To determine the full electron configuration of calcium, we will follow the Aufbau principle and the periodic table's filling order.

1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2

The electron configuration starts with the first energy level, which consists of a single s orbital. In calcium's case, the 1s orbital is filled with two electrons, following the Pauli exclusion principle (each orbital can hold a maximum of two electrons with opposite spins).

Next, we move to the second energy level, which contains the 2s and 2p orbitals. The 2s orbital is filled with two electrons, and the 2p orbital is filled with six electrons, again following the Pauli exclusion principle and the Hund's rule (electrons fill degenerate orbitals singly with parallel spins before pairing).

Continuing to the third energy level, we fill the 3s and 3p orbitals. The 3s orbital is filled with two electrons, and the 3p orbital is filled with six electrons, following the same principles as before.

Finally, we arrive at the fourth energy level, where we fill the 4s orbital. The 4s orbital can accommodate up to two electrons. In the case of calcium, the remaining two electrons occupy the 4s orbital.

This electron configuration demonstrates the distribution of calcium's 20 electrons across its energy levels and orbitals, with each orbital holding the maximum number of electrons allowed based on the rules of electron filling order and electron pairing.

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CrO and Cr₂O₃ make up the simplest chromium oxide formula.

What name does Cr₂O₃ use?

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