3. Identify at least TWO acidic lakes or other bodies of water in Washington State.

Name AND Location of acidic lake or other body of water in Washington State and pH balance

The balanced reaction of this chemical reaction is as follows :

• As we can see, this is a double-displament reaction

Thermoluminescence can date sediments and rocks directly

Radiocarbon dating, also known as carbon-14 dating, is a technique used to estimate the age of carbon-containing materials that have been preserved in the last 50,000 years. It is widely used in geology, archaeology, and paleontology.The theory behind carbon dating is straightforward: living organisms absorb carbon from their environment and use it to create new organic compounds. Carbon-14 is a radioactive isotope of carbon that is absorbed by organisms at the same rate as ordinary carbon. Carbon-14 decays at a constant rate, and measuring the amount of carbon-14 in a sample can provide an estimate of how long it has been since the organism died or the carbon-containing material was formed.

Thermoluminescence (TL) dating, on the other hand, is a technique used to date sediments and rocks directly. It is based on the fact that when rocks are heated, they emit light energy. This light energy is trapped within the crystal structure of the rock, and over time, it accumulates. By measuring the amount of light energy trapped within a sample, scientists can estimate how long it has been since the sample was last heated.

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Answer:

Valence Electrons

Explanation:

Answer:

Valence

Explanation:

The outermost shell are the valence electrons

Step 1

The reaction must be completed and balanced as follows:

C3H8 + 5 O2 => 3 CO2 + 4 H2O

-------------

Step 2

Information provided:

20.0 g of C3H8

10.0 g of O2

----

Information needed:

1 mole of C3H8 = 44.1 g

1 mole of O2 = 32.0 g

(use your periodic table please)

-------------

Step 3

By stoichiometry,

C3H8 + 5 O2 => 3 CO2 + 4 H2O

44.1 g C3H8 ---------- 5 x 32.0 g O2

20.0 g C3H8 ---------- X

X = 20.0 g C3H8 x 5 x 32.0 g O2/44.1 g C3H8

X = 72.6 g O2

For 20.0 g of C3H8, 72.6 g of O2 is needed, but there is only 10.0 g of O2.

Therefore,

Answer:

The limiting reactant = O2

The excess = C3H8

Answer:

density = 5 g/ml

Explanation:

D=m/v. Mass=30g and Volume=6mL

SO solve for D when m = 30 and v = 6

D=m/v

D = 30/6

density = 5 g/ml

Answer:

5.12x10¹¹ millimeters

Explanation:

Milli is a prefix used in science and engineering to decribe the number as the exponent x10⁻³. In the prefix kilo, the number is at the exponent x10³.

5.12x10⁵ kilometers are:

5.12x10⁵ kilometers * (1000m / 1km) = 5.12x10⁸ meters

5.12x10² meters * (1m / 1000millimeters) = 5.12x10¹¹ millimeters

Answer:

300g

Explanation:

your weight will change but mass is constant and does not change.

The intermolecular attraction force that acts between two adjacent parts of a substance, especially a solid or liquid, is known as cohesion. A piece of substance is held together by this force.

Surface tension is the propensity for liquid surfaces that are at rest to condense into the smallest surface area. Razor blades and insects, which have a density greater than that of water, can float on the surface of the water without even becoming partially buried because to surface tension.

How are cohesion and surface tension related?

The phenomenon known as surface tension is caused by the cohesive forces between liquid molecules.

The ability of a water surface to withstand breaking is referred to as surface tension when discussing a compound like water.

In a liquid, molecules will be drawn to one another. Cohesion is the molecular attraction of similar molecules, whereas adhesion is the molecular attraction of dissimilar molecules.

Cohesion is most closely connected to surface tension. For instance, water molecules are drawn to one another, which causes the surface tension of a pool of water.

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To Find :

The mass, in grams, of \(1.505 \times 10^{23}\) molecules of carbon disulfide (CS₂).

Solution :

Molecular mass of CS₂ = 76 gm/mol .

It means that mass of \(6.022 \times 10^{23}\) molecules of CS₂ is 76 gm/mol.

Let, mass of \(1.505 \times 10^{23}\) molecules of carbon disulfide (CS₂) is x.

So,

\(x= 76\times \dfrac{1.505 \times 10^{23}}{6.022\times 10^{23}}\\\\x = 76 \times \dfrac{1.505}{6.022}\\\\x = 19 \ gm\)

Therefore, the mass in gram is 19 gm.

the second option.. Option b

Answer:

They both have the same density.

Explanation:

Density = mass/volume

10g ÷ 4 = 2.5

13g ÷ 5.2 = 2.5

There are  1.554 moles are in the sample of gas when a  gas has a volume of 27. 5 L at 302 K and 1. 40 atm.

Calculation,

The given question is solved by the using of ideal gas equation which is shown below.

PV = nRT                               .... ( i )

where , P is he pressure of the gas = 1. 40 atm

V is the volume occupied by the gas = 27.5 L

R is the universal gas constant = 0.082 L atm/K mol

T is the temperature =  302 K

n is he number of moles of the gas = ?

By putting the value of pressure  P , volume V , Universal gas constant and temperature T in the equation ( i ) we get the number of moles.

1. 40 atm × 27.5 L = n × 0.082 L atm/K mol×  302 K

n = 1. 40 atm × 27.5 L/0.082 L atm/K mol×  302 K = 1.554 mole

There are  1.554 moles are in the sample of gas

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Answer:

Explanation:

The molecule trans-1,2-dibromocyclopentane shows both an enantiomer and a diastereomer.

The given compound trans-1,2-dibromocyclopentane make stereoisomers. Stereoisomers have the same molecular formula but the 3D space arrangement is different. Another type is constitutional isomers, constitutional isomers have the same molecular formula but different bond connectivity. The given compound trans-1,2-dibromocyclopentane make enantiomers as well as diastereomers. Enantiomers are stereoisomers having superimposable mirror images of each other. While diastereomers are the stereoisomers that are not superimposable on each other or simply we can say not mirror images of each other. So the correct option is the third option, The molecule trans-1,2-dibromocyclopentane shows both an enantiomer and a diastereomer.

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Answer:

C3H8(g) + 5O2(g) —> 3CO2(g) + 4H2O(g)

Explanation:

The burning of propane is simply called Combustion of propane.

When an organic compound under goes Combustion, carbon dioxide, CO2 and water, H2O are produced respectively.

Thus, the burning of propane will yield the following:

C3H8(g) + O2(g) —> CO2(g) + H2O(g)

Now, let us balance the equation. This is illustrated below:

C3H8(g) + O2(g) —> CO2(g) + H2O(g)

There are 3 atoms of C on the left side and 1 atom on the right side. It can be balance by putting 3 in front of CO2 as shown below:

C3H8(g) + O2(g) —> 3CO2(g) + H2O(g)

There are 8 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 4 in front of H2O as shown below:

C3H8(g) + O2(g) —> 3CO2(g) + 4H2O(g)

There are 2 atoms of O on the left side and a total of 10 atoms on the right side. It can be balance by putting 5 in front of O2 as shown below:

C3H8(g) + 5O2(g) —> 3CO2(g) + 4H2O(g)

Now, the equation is balanced.

Answer:

C

Explanation:

I hypothesis needs to be tested to know whether it is true or not. Here is the definition:

A supposition or proposed explanation made on the basis of *limited evidence as a started point for further investigation*

Answer:

Galaxies, Clusters

Explanation:

The universe is composed of about 100 billion galaxies grouped into clusters.

[RevyBreeze]

Answer:

Galaxies, Clusters

Explanation:

Here are some common methods to test nutrients in water: Nitrate, Phosphate, Ammonia, Chloride, and iron , and testing for nutrients in water is important because excessive levels of certain nutrients can lead to water pollution and harm aquatic life.

Nitrate is a common form of nitrogen found in water, and high levels can indicate pollution from agricultural or urban runoff. Phosphate is an important nutrient for plant growth, but excessive levels in water can lead to harmful algal blooms and oxygen depletion. The molybdenum blue method is a well-established method for testing for phosphate in water, and it is relatively sensitive and accurate.

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The rate constant of a first-order reaction that takes 555 seconds for the reactant concentration to drop to half of its initial value is 1.2 x 10^-3 sec^-1.

A first-order reaction refers to a chemical reaction in which the rate of reaction is proportional to the concentration of the reactant. In other words, doubling the reactant concentration doubles the reaction rate.

The time taken that is taken for original population of radioactive atoms to decay to half of initial value is called the half-life. The half-life of a first-order reaction is a constant that is related to the rate constant (k) for the reaction given by: t1/2 = 0.693/k. Radioactive decay reactions are first-order reactions.

According to the provided information, t1/2 = 555 seconds

Hence,

555 = 0.693/k

k = 0.693/555 = 0.0012486 = 1.2 x 10^-3 sec^-1

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The magnesium metal has reacted completely:

When the magnesium ribbon reacts with hydrochloric acid magnesium chloride is formed and hydrogen gas is released. The temperature of the test tube changes, slight bubbles are generated, and the magnesium ribbon dissolves in the water and turns blue.

Magnesium reacts with acids to produce visible hydrogen gas bubbles. The combustion of magnesium is an exothermic reaction because energy is released into the environment when particles of magnesium and oxygen collide and form new bonds. Citric acid and baking soda are endothermic when the temperature drops. Magnesium and hydrochloric acid generate heat when the temperature rises.

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Explanation:

The heat of reaction (ΔH) for the given reaction is 180.4 kJ/mol. To calculate the heat of reaction (ΔH) for the given reaction:

CCl₄(g) + H₂O(g) -> CHCl₃(g) + HCl(g)

You would need the standard enthalpies of formation for each compound involved in the reaction. The standard enthalpy of formation (ΔHf) is the enthalpy change when one mole of a compound is formed from its elements in their standard states.

Here are the standard enthalpies of formation for the compounds involved:

ΔHf[CCl₄(g)] = -135.5 kJ/mol

ΔHf[H₂O(g)] = -241.8 kJ/mol

ΔHf[CHCl₃(g)] = -104.7 kJ/mol

ΔHf[HCl(g)] = -92.3 kJ/mol

To calculate ΔH for the reaction, you need to sum up the enthalpies of formation of the products and subtract the sum of the enthalpies of formation of the reactants:

ΔH = ΣΔHf(products) - ΣΔHf(reactants)

ΔH = [ΔHf[CHCl₃(g)] + ΔHf[HCl(g)]] - [ΔHf[CCl₄(g)] + ΔHf[H₂O(g)]]

ΔH = [(-104.7 kJ/mol) + (-92.3 kJ/mol)] - [(-135.5 kJ/mol) + (-241.8 kJ/mol)]

ΔH = -196.9 kJ/mol - (-377.3 kJ/mol)

ΔH = 180.4 kJ/mol

Therefore, the heat of reaction (ΔH) for the given reaction is 180.4 kJ/mol.

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Explanation:

To solve this question, we need to use the Hess's Law.

Hess's Law states that: in a chemical reaction, the heat released or absorbed is constant and independent of the number of steps the reaction goes through. That is, the law states that the enthalpy change of a chemical reaction depends only on its initial state and its final state.

Hess's Law is also known as the law of the sum of heats of reaction, because the enthalpy change is equal to the sum of the changes in the steps through which the chemical reaction passes (intermediate reactions). The calculation is performed as follows:

- If the chemical reaction is inverted, the sign of the enthalpy change must also be inverted;

- If the equation is multiplied, the enthalpy change must also be multiplied;

- If dividing the equation, the enthalpy change must also be divided.

So we're going to invert, divide, or multiply each given equation in order to get the equation that the question gives us.

The equation the question gives us is:

4Al(s) + 3MnO2(s) --> 2Al2O3 (s) + 3Mn(s)

Let's multiply the first equation by 2:

4 Al + 3 O2 --> 2 Al2O3

ΔH = -1676 * 2 = -3,352 kJ

Let's invert and multiply by 3 the second equation:

3 MnO2 -> 3 Mn + 3O2

ΔH = -521 * 3 * (-1)

ΔH = 1,563 kJ

Answer: -1,789 kJ

Answer:

Explanation:

The percent composition of carbon in acetic acid is 40.002%.

BrCH2CH2OH, has the strongest dipole-dipole interactions among the given compounds. So, the correct option is C)BrCH2CH2OH.

The intermolecular forces present in a substance determine its physical properties such as melting point, boiling point, and solubility.

Among the given compounds, CBr4 and Br2 are nonpolar molecules and only have weak London dispersion forces as their intermolecular force. CH2Br is a polar molecule, but its dipole moment is relatively small, resulting in weak dipole-dipole interactions.

On the other hand, BrCH2CH2OH is a polar molecule with a larger dipole moment due to the presence of the hydroxyl (-OH) group. Thus, it has stronger dipole-dipole interactions as its intermolecular force.

Dipole-dipole interactions arise due to the attraction between the partially positive and negative ends of polar molecules. The strength of dipole-dipole interactions depends on the magnitude of the dipole moment of the molecule.

Therefore, option C, BrCH2CH2OH, has the strongest dipole-dipole interactions among the given compounds.

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The number of valence electrons in each of the atoms are;

B - 3

Al - 3

Cl - 7

Ne - 8

We define an atom as the smallest part of a substance that can take part in a chemical reaction. We know that when we begin to break down the elements that the atoms can be found in the element and there are sub atomic particles that can also be found inside the atom of the element.

The electrons that are found at the last shell or the outermost shell of the atom are the ones that we call the valence electrons that can be found in the atom.

The electronic configuration of boron is \(1s^2 2s^2 2p^1\) (the n =2 level is the valence shell)

The electronic configuration of Al is \(1s^2 2s^2 2p^6 3s^2 3p^1\)( the n= 3level is the valence shell)

The electron configuration of Cl is \(1s^2 2s^2 sp^6 3s^23p^5\) ( the n= 3level is the valence shell)

The electron configuration of Ne is \(1s^2 2s^2 2p^6\) (the n =2 level is the valence shell)

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Answer:

5

Explanation:

I don't remember very thing from this unit but I believe 5 makes it possible

Answer:

The particles dispersed in a colloid are much smaller than those in a suspension and do not settle out.

Explanation:

A suspension is a heterogeneous mixture of substances that does settle out on standing. The particles in a suspension are large enough that they can even be seen with naked eyes. The particles in a suspension are more than 1,000 nm in size.

A colloid contains particles that are lesser in size than a suspension (about 1-1,000 nm). The particles in a colloid can not be seen except with the help of a light microscope.

Dalton's law

States that the total pressure exerted by a mixture of gases is the sum of the pressures exerted independently by each gas in the mixture.

Dalton's law, which states that a gas mixture's overall pressure is equal to the sum of its component gases' partial pressures. The pressure that each gas would produce if it occupied the same volume of the mixture by itself at the same temperature is known as the partial pressure.

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