Which of the following shows the solution set to the quadratic equation 8x2+40x=0

Chlorine serves as the reaction's limiting reagent, and sodium serves as the reaction's reagent. The point of equivalency, known as endpoint of the reaction, where the mass of sodium and mass of chlorine are equal.

The white, crystalline substance sodium chloride, or ordinary table salt, which comprises sodium cations and chloride anions, is created by a powerful reaction between the elements sodium and chlorine.

Because each chemical equation must be balanced and the amount of atoms of each element on the reactant side must match the number of atoms of each other, chemical equations serve as examples of the law of conservation of mass.

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Answer:

4:2 (2:1 simplified)

Explanation:

Check the coefficients!

The items needed to run the spectrophotometry experiment are the correct option is  A. Spectrophotometer C. Blank solution D. Sample solution E. Cuvette F. Stir bar.

The spectrophotometer is the instrument that is used to measure the amount of the light the sample absorbs. This will work by passing the beam of the light through the sample to measure the intensity of the light of the sample. The instrument are used to measure the color and is used to monitoring the color.

The spectrophotometer is used to in the variety of the spectroscopy experiment such to determine the wavelength of the peak.

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Answer:

Explanation:

A perfect diamond is a single molecule made of carbon atoms.

DNA is a super long molecule that has information uniquely describing every human being.

When two or more atoms chemically bond together, they form a molecule.

They are very small in size.

They have space between them.

They are in constant random motion.

molecules move when Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.

In 1926, French physicist Jean Perrin received the Nobel Prize in physics for proving, conclusively, the existence of molecules.

Molecules can exist in free state because they are very stable.

The smallest particle of a compound capable of existing on its own is a Molecule-not a atom.

Answer:

rate = [NO]²[O2]

Explanation:

The rate law for the reaction:

2 NO(g) + O2(g) → 2 NO2(g)

Is expressed in terms of reactants as follows:

rate = [NO]ⁿ[O2]ˣ

Where n and x are the coefficients of the rate law.

If [NO] is doubled, the rate increased 4 times. That is only possible if:

rate = [NO]²[O2]ˣ

Now, as [NO] is doubled and increased the rate 4 times, and [NO] + [O2] when doubled increased the rate 8 times, doubled [O2] implies increased the rate 2 times. That is only possible is:

There are 2.208 moles of gold (III) chloride in 670 g.

To determine the number of moles in 670 g of gold (III) chloride, we need to first calculate the molar mass of gold (III) chloride, which is AuCl3.

The atomic mass of gold is 196.97 g/mol and the atomic mass of chlorine is 35.45 g/mol. Since there are three chlorine atoms in each molecule of gold (III) chloride, we multiply the atomic mass of chlorine by 3:

35.45 g/mol x 3 = 106.35 g/mol

Adding the atomic masses of gold and chlorine together gives us the molar mass of gold (III) chloride:

196.97 g/mol + 106.35 g/mol = 303.32 g/mol

Now, we can use this molar mass to convert 670 g of gold (III) chloride into moles:

670 g / 303.32 g/mol = 2.208 moles

Therefore, there are 2.208 moles of gold (III) chloride in 670 g.

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Answer:

Two

Explanation:

In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products.

Answer: 2 it has two

Explanation:

Answer:

The White Dwarfs are very hot stars, which are small in size and relatively dim. They are found in the lower left of the H-R Diagram. The Main Sequence is a band of stars, which includes most of the stars, like our Sun. These are usually smaller stars, often dwarf stars.

Explanation:

Answer:

Found along a region called the Main Sequence

Explanation: Main sequence starts vary widely in effective temperatures but the hotter they are the more luminous they are

Answer:

I`m pretty sure that B is right

Explanation:

Answer:

The first one - Vacuoles

Explanation:

Hope this helps. :)

Answer:

Mass of nitrogen = 25.222g

Explanation:

We know that the mass of the unknown composition is 58.0g, so the total mass must add up to 58.0g, so let's make the unknown mass of nitrogen = x

24.3g + 3.072g + 5.406g + x = 58.0g

32.778g + x = 58.0g

x = 58.0g - 32.778g = 25.222g

Answer:

A frog heart has three chambers.two atrium and one ventricle is answer

Explanation:

I hope it's helpful!

Option (a) is correct. Peridotite that undergoes partial melting will create a melt enriched in iron, magnesium, felspars and silica.

The type of rock, Peridotite is a type of igneous rock that is dark colored and has coarse grains. It is a dense rock and is most commonly light to dark green in color. The peridotite description is that it is an important rock because it makes up the main portion of the Earth's mantle and has many uses. Peridotite is named after the gemstone peridot. Peridot is a green color and is made of the mineral olivine, a main component of peridotite. Sedimentary rock is formed when layers settle and become cemented into solid rock. igneous rock, is formed when lava or magma cools and solidifies and is the group to which peridotite belongs.

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Answer:

what is this question??

Answer:

ether

Explanation:

ether is -OR

- Hope that helps! Please let me know if you need further explanation.

Answer:

5

Explanation:

First find the balanced equation for this rxn

C3H8    +  5O2    ====>     3 CO2    + 4  H2O

To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. The correct option is option A.

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.

Propane gas, C\(_3\)H\(_8\), burns in excess oxygen gas. When the equation for this reaction is correctly balanced and all coefficients are reduced to their lowest whole-number terms, the coefficient for O\(_2\) is 5.

C\(_3\)H\(_8\)    +  5O\(_2\)  \(\rightarrow\)   3 CO\(_2\)    + 4  H\(_2\)O

Therefore, the correct option is option B.

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Answer:

The answer is

Explanation:

The density of an object can be found by using the formula

From the question

mass of metal = 210 g

volume = 81 cm³

Substitute the values into the above formula and solve for the density

That's

= 2.592592

We have the final answer as

Hope this helps you

Answer:

684

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 684 g of lead would be required to make 119 grams of water.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

The balanced equation for the given reaction can be written as below

Pb + PbO\(_2\) + 2H\(_2\)SO\(_4\) \(\rightarrow\)2PbSO\(_4\) + 2H\(_2\)O

Mathematically,

The mole ratio between lead and water is 1:2

(119 g H2O) / (18.01532 g H2O/mol) x (1 mol Pb / 2 mol H2O) x (207.21 g Pb/mol) = 684 g Pb

The mass of lead comes out to be  684 g.

Therefore, 684 g of lead would be required to make 119 grams of water.

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Answer: 22.7848% F or 23%

Explanation: %F = 3.6g/15.8g • 100% = 22.7848% F

The percentage composition of hydrogen in the given sample is equal to 31%.

The percentage composition of a given compound can be described as the ratio of the quantity of each element to the total quantity of individual elements in the compound multiplied by 100. The quantity can be measured in terms of grams of the elements present in the sample.

The percent composition is expressed in its composition in terms of all the elements present. Thus, it helps in the chemical analysis of any given compound.

The percentage composition is expressed using the following formula,

Percentage composition of E = (E/T) × 100

Where E represents the total quantity of element E present in the compound and T represents the total quantity of all the elements present in the compound.

Given, the mass of the F, H, and C is 3.60g, 4,90 g, and 7.30 g respectively.

The total mass of the given sample = 15.8 g

The mass of the hydrogen in the sample = 4.90 g

The percent composition of H = (4.90/15.8) × 100 = 31 %

Therefore, the percent composition of hydrogen in this sample is 31%.

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Answer:

Explanation: 11

a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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Answer:

I am guessing you want to balence this

1,6,2,3

Fe2(CrO4)3 + 6LiNO3 -> 2Fe(NO3)3 + 3Li2CrO4

Answer:

2.78035217*10^6 m

Explanation:

C = v

3.0e8 = (107.9)

= 2.78035217*10^6 m

When cooking in the same pan and on the same burner setting, 250 ml (about 1 cup) of water will start to boil more quickly than 1 l (about 4 cups) of water. This is because 1 cup of water has a lower heat capacity than 4 cups.

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If the sample of magnesium used in a lab was contaminated with another metal that doesn't react with hydrochloric acid, then the results obtained in the experiment would be affected.

This is because the data collected during the experiment would reflect the reaction between hydrochloric acid and the contaminated sample instead of pure magnesium. As a result, the following changes in results might have been observed:

1. The mass of the contaminated sample would be higher than the mass of pure magnesium.

2. The rate of reaction between the contaminated sample and hydrochloric acid would be slower than the reaction between pure magnesium and hydrochloric acid.

3. The volume of hydrogen gas collected from the reaction would be lower than the volume of hydrogen gas collected in the reaction between pure magnesium and hydrochloric acid.

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Answer:

The answer is B, Each chlorine has three non-bonded pairs and one bonded pair of electrons.

Explanation:

I took the test :)

Each chlorine has three non-bonded pairs and one bonded pair of electrons. Hence, option B is correct.

Lewis dot structures also called electron dot structures are diagrams that describe the chemical bonding between atoms in a molecule.

Phosphorous is the central atom with a horizontal line connecting to each of the three Chlorine atoms around it. Phosphorous has a pair of dots on it. Each of the three chlorine atoms has a pair of three dots on it.

Each chlorine has three non-bonded pairs and one bonded pair of electrons.

Hence, option B is correct.

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0.75x2.5x328/(0.325x1.5)

=1261.5K

The balanced equation for the reaction is: 2AgNO₃ + Mg → Mg(NO₃)₂ + 2Ag. A reaction occurred between magnesium and silver nitrate, resulting in the formation of magnesium nitrate and silver. This is a single replacement reaction, also known as a displacement reaction. In this type of reaction, one element replaces another element in a compound.

To determine that a reaction occurred, we can observe several indications. Firstly, we see the formation of a solid precipitate (silver) when the magnesium strip is added to the silver nitrate solution. This suggests a chemical change has taken place. Secondly, there may be a change in color, from colorless to gray (silver) or a color change in the solution. Lastly, there may be the evolution of gas bubbles or the release of heat. These observations indicate a chemical reaction has occurred.

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