write a paragraph using the words atom, element, compound, and mixture.

Answer:

All countries need to move their economies away from fossil fuels as soon as possible. Invest in renewable energy. Changing our main energy sources to clean and renewable energy is the best way to stop using fossil fuels. These include technologies like solar, wind, wave, tidal and geothermal power

The pH of a buffer solution is determined by the concentration of the weak acid and the conjugate base present in the solution. When 0.0015 mol of Ba(OH)2 is added to 0.210 L of a solution containing 0.250 m of weak acid Hy and 0.110 m y-, the pH of the solution will be affected.

The amount of Ba(OH)2 added is small enough to not cause a drastic change in the pH, but it will still be higher than it was before the addition. The pH of the solution can be calculated by taking the ratio of Hy to y- and then using the Henderson-Hasselbalch equation, which states that the pH of a buffer solution is equal to the pKa of the weak acid plus the log of the ratio of the weak acid to the conjugate base.

After the addition of the Ba(OH)2, the ratio between Hy and y- will change, which will cause the pH to change as well. The exact pH of the solution can be calculated by taking into account the amount of Ba(OH)2 added, the initial concentrations of Hy and y-, and the pKa of the weak acid.

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"Which of the following is not an argument in favor of drilling in the Artic National Wildlife Refuge (ANWR)?" is B. This means that the argument "The land area affected will be small relative to the total area" is not an argument against drilling in ANWR. Rather, it is an argument in favor of drilling because it suggests that the environmental impact of drilling will be minimal in comparison to the total size of the refuge.

The answer is B

The argument that the land area affected by drilling in ANWR will be small relative to the total area is in favor of drilling in ANWR. Therefore, it cannot be the answer to the question asking for the argument that is not in favor of drilling in ANWR. The other arguments listed - bringing jobs and money to Alaska, reducing the United States' dependence on imported oil, reducing the cost of oil, and using money from exported oil for wildlife conservation efforts - are all in favor of drilling in ANWR.

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Answer:

31 mol N₂

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

25 mol HCl

Step 2: Identify Conversions

RxN:   4 mol HCl = 5 mol N₂

Step 3: Stoichiometry

\(25 \ mol \ HCl(\frac{5 \ mol \ N_2}{4 \ mol \ HCl} )\) = 31.25 mol N₂

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

31.25 mol N₂ ≈ 31 mol N₂

Answer:

6=100  

Explanation:

Answer:

asexual cell

Explanation:there are mainly 2 types sexual and asexual i would say asexual because they grow without another parent and don't have a nucleus.

Percent yeild is the measure of the efficiency of a chemical reaction

chemical reaction's efficiency has traditionally been assessed by comparing the reaction's yield to its theoretical value. The estimated quantity of the product produced by the listed reactants has been used as the theoretical value. The laboratory concentration that was obtained from a chemical reaction was the actual yield. the efficiency of the reaction is directly proportional to how closely the actual yield value matches the theoretical yield, and vice versa. The percent yield has been used to quantify the effectiveness of chemical reactions.

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The pH of the solution is 1.52 and the concentration of C6H6O62- is 2.2 * 10^-7 M.

We know that;

H₂C6H6O6 ⇔HC6H6O6^-(aq)    +   H^+(aq) ----- (1)

Ka1 = 7.9 x 10^-5

Again;

HC6H6O6^-(aq) ⇔ C6H6O6^2-(aq)  +   H^+(aq) ------- (2)

Ka2 = 1.6 x 10^-12

Given that Ka2 <<<< Ka1 we have to apply equation 1 to obtain H^+ hence;

Ka1 = [HC6H6O6^-] [H^+]/[H₂C6H6O6]

Let  [HC6H6O6^-] = [H^+] =x

7.9 x 10^5 =x^2/0.1 - x

But x <<< 0.1 thus;

7.9 x 10^5 =x^2/0.1

x = √7.9 x 10^-5  * 0.1

x = 0.03 M

pH = -log(0.03 M)

pH = 1.52

To obtain  C6H6O6^2-;

Ka2 = [ C6H6O6^2-] [ H^+]/[HC6H6O6^-]

Also;

[ C6H6O6^2-] = [ H^+]= x

Now;

1.6 x 10^-12 = x^2/0.03 -x

But x<<<0.3

Hence;

1.6 x 10^-12 = x^2/0.03

x = √1.6 x 10^-12 * 0.03

x = 2.2 * 10^-7 M

The concentration of C6H6O6^2- is  2.2 * 10^-7 M.

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The ionic form of the metal atom that is not likely to be found in the pocket of the catalytically active DNA polymerase is sodium that is Na.

The sodium that is Na does not readily to form the  divalent cation, and is essential for the DNA polymerase catalytic. The sodium is the metal and has ability to donate the electron and form the cation. The net charge on the sodium cation is +1. The valence electron of the sodium atoms is one. The  net charge on the sodium atom in the mono positive ion is equal to the valence electrons and sodium does not not readily forms the divalent ion.

Thus, the sodium metal atom is not likely to be found in the pocket of the catalytically active of the DNA  polymerase.

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Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

An emulsion is a mixture of two liquids that are not normally soluble in each other, such as oil and water. The liquids are held together by an emulsifying agent, such as lecithin, which acts as a stabilizer.

Using brine can help with an emulsion because the salt in the brine can help to break down the proteins in the emulsifying agent, causing it to bind more strongly with the liquids and improving the stability of the mixture. Additionally, the high salt content in brine can also help to inhibit the growth of bacteria, which can be beneficial when working with perishable ingredients in an emulsion.

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Answer:

2 A): Fluorine

B): more protons, more force attraction less atomic radius

3A): Helium

B):it has small atomic radius

4 th question is not visible.....

The initial rate for the reaction when [S₂O₈²⁻] is 0.15 M and [I-] is 0.15 M is 8.10 × 10⁻³ M s⁻¹

The rate law states

Rate = k(S₂O₈²⁻)(I⁻)

The rate constant, k, can be determined by substituting the rate and concentrations from any of the experiments into the rate law. Using Experiment 1, we have:

9.00 x 10⁻³M/s = k(0.25M)(0.10)

k = (9.00 x 10⁻³ M/s)/(0.25M)(0.10M)

k = 36 x 10⁻²M⁻¹S⁻¹

Rate = (3.6 x 10⁻²M⁻¹S⁻¹)(0.15M)(0.15M)

Rate = 8.10 x 10⁻³M/s

The above answer is based on the full question below

The following set of data was obtained by the method of initial rates for the reaction

S₂O₈²⁻(aq) + 3 I-1(aq) → 2 SO₄²⁻(aq) + I3-1(aq)

What is the initial rate when S2O82- is 0.15 M and I- is 0.15 M?

Exp [S₂O₈²⁻] (M) [I-1] (M) Rate (M/s)

1 0.25 0.10 9.00 x 10⁻³

2 0.10 0.10 3.60 x 10⁻³

3 0.20 0.30 2.16 x 10⁻²

Select one una:

a. 5.40 × 10-2 M s⁻¹

b. 1.22 × 10-2 M s⁻¹

c. 4.10 × 10-6 M s⁻¹

d. 8.10 × 10-3 M s⁻¹

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40.55ml volume of acetone has a mass of 32.00 g.

Acetone is a common solvent with a density of 0.791 g/ml. Acetone is a chemical compound with the molecular formula C3H6O. It is a colorless, flammable liquid with a distinct odor.

Acetone is most commonly used as a solvent for cleaning and degreasing, but it also has a wide range of other uses, such as in the manufacture of plastics, pharmaceuticals, and cosmetics.

To calculate the volume of acetone with a mass of 32.00 g, we need to use the following equation:

Volume (ml) = Mass (g) / Density (g/ml)

Plugging in the given values, we get:

Volume (ml) = 32.00 g / 0.791 g/ml

Therefore, the volume of acetone with a mass of 32.00 g is 40.55 ml.

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A solution of the ionic salt Lihco3 would have 11.3 pH.

In chemistry, salt exists as a chemical compound consisting of an ionic group of positively charged cations and negatively charged anions, which results in a combination with no net electric charge. A common example stands table salt, with positively charged sodium ions and negatively charged chloride ions.

The fragment ions in a salt compound can be either inorganic, such as chloride (Cl−), or organic, such as acetate (CH3CO−2). Each ion can be either monatomic, such as fluoride (F−), or polyatomic, such as sulfate (SO2−4).

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Answer:

c

Explanation:

Change in velocity over time

Answer:

In physics or physical science, acceleration (symbol: a) is defined as the rate of change (or derivative with respect to time) of velocity. It is thus a vector quantity with dimension length/time². In SI units, acceleration is measured in meters/second² using an accelerometer.

Explanation:

A protein could be created from a set of amino acids. A naturally occurring, incredibly complex compound known as a protein is made up of amino acid residues connected by peptide bonds.

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In the reaction of calcium and nitric acid, the oxidizing agent can be identified as nitric acid.

Let us break it down further:

First, it is important to know that oxidation is a chemical reaction that occurs when an atom loses an electron and increases its oxidation state.

An oxidizing agent, also known as an oxidant, is a chemical compound that can cause other compounds or elements to lose electrons by being reduced itself.

According to the given reaction, we can see that the calcium atom loses electrons, which indicates that it has been oxidized.

The nitric acid, on the other hand, has caused the calcium to lose electrons, which means that the nitric acid has been reduced, making it an oxidizing agent.

In the reaction, nitric acid is the oxidizing agent, and the calcium is being oxidized into calcium nitrate (Ca(NO3)2).

The balanced chemical equation for the reaction is:

Ca(s) + 2HNO₃(aq) → Ca(NO₃)₂(aq) + H₂(g)

In this equation, the reactants are calcium and nitric acid.

The products are calcium nitrate and hydrogen gas.

The nitric acid is the oxidizing agent that causes the oxidation of calcium into calcium nitrate.

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Answer:223

Explanation:223

Organic compounds are characterized by covalent bonds and molecular solids. Therefore, the correct option is 3.

Covalent bonds are formed when atoms share electrons to achieve a stable electron configuration. In organic compounds, carbon atoms are usually bonded to other carbon atoms and to hydrogen atoms, forming a variety of functional groups. These functional groups give organic compounds their unique properties and reactivity.
Molecular solids are formed when molecules are held together by intermolecular forces, such as van der Waals forces, hydrogen bonds, and dipole-dipole interactions. Organic compounds typically have low melting and boiling points due to the weak intermolecular forces between the molecules. However, there are exceptions to this general rule, such as polymers, which can have high melting and boiling points due to their long, chain-like structures.
In contrast, ionic bonds and ionic solids are characteristic of inorganic compounds, which typically involve the transfer of electrons between atoms to form ions. Ionic solids are held together by strong electrostatic forces between ions of opposite charges, resulting in high melting and boiling points. In summary, covalent bonds and molecular solids are the characteristic bonds and solids of organic compounds.

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Answer:

36

Explanation:

Se has a negative charge of -2

in order for that to be possible there has to be 2 more negative charges than positive chrages

in other words

34 protons 36 electrons

34+ 36-

The mass of NaCl required to raise the boiling point of 4.73 L of water by 1.00°C is 25.3 g.

The boiling point elevation (ΔTb) is given by the equation ΔTb = Kb × molality, where Kb is the boiling point elevation constant for water (0.51°C/m) and molality is the concentration of solute in mol/kg of solvent. To calculate the molality, we need to convert the volume of water to mass (assuming a density of 1 g/mL) and calculate the number of moles of water. We have:

To raise the boiling point by 1.00°C, we need to find the molality that gives a ΔTb of 1.00°C. Rearranging the equation above, we get:

Now we can calculate the mass of NaCl required to achieve this molality:

Therefore, the mass of NaCl required to raise the boiling point of 4.73 L of water by 1.00°C is 25.3 g (since 550 g is more than the mass of water).

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The expression relating the concentration of a gas in \(\mu g/m^-^3 (X)\) with the concentration expressed in ppm (Y) is \(Y = (X/MW) * 10^6 / V\)

To derive an expression relating the concentration of a gas in \(\mu g/m^3 (X)\) with the concentration expressed in ppm (Y), we can use the ideal gas law. The ideal gas law states that \(PV = nRT\), where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. Rearranging the equation, we have \(n = PV/RT\)

To convert the concentration from \(\mu g/m^-^3 (X)\) to moles (n), we divide X by the molecular weight (MW) of the gas. Thus, \(n = X/MW\)

Combining the two equations, we have \(X/MW = PV/RT\)

Since the concentration expressed in ppm (Y) is the same as the number of moles per million parts of air, we can write \(Y = n * 10^6 / V\)

Substituting \(n = X/MW\), we get \(Y = (X/MW) * 10^6 / V\)

Therefore, the expression relating the concentration of a gas in \(\mu g/m^3 (X)\) with the concentration expressed in ppm (Y) is:

\(Y = (X/MW) * 10^6 / V\)

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Complete question is:

Using the ideal Gas Law, derive an expression relating the concentration of a gas \(\mu_g^-^3 (X)\) with the concentration expressed in ppm (Y). (10 pts) Hint:- Ideal gas law \(PV= nRt -R = 0.0821 atm mol^-^1\)  −MW=X= molecular weight

Answer:

A mixture is two or more substances combined. There are no chemical reactions involved, so no new substances are made. Mixtures can often be separated by physical means. For example, a mixture of sand and water could be separated by filtration. A mixture of sand and iron filings could be separated magnetically.

A solution is one kind of mixture. It’s commonly the combination of a liquid and a solid, so that the particles of the solid mix with those of the liquid so that they can’t be separated by filtration. However solutions may be separated in other ways. For example, in salt water the salt and the water can be separated by distillation.

Explanation:

Answer:

Exothermic Reaction

Explanation:

The test tube feels hot as a result of an increase in temperature of the surroundings. This means that due to the reaction between zinc metal and hydrochloric acid, heat was released. The hot test tube indicates that this is an exothermic reaction.

Answer:

the reaction releases heat

Explanation:

still need help with this?

Answer:

Answer:

Typhoons

Explanation:

A tropical cyclone is a word that is used by meteorologists to explain a rotating, organized system of clouds & thunderstorms that take their origins over tropical or subtropical waters and also possess closed but low-level circulation.

Now, In the Northwest part of the Pacific ocean, these tropical cyclones which are west of the dateline are referred to as Typhoons while In the southwest Pacific and in the Indian Ocean they are called Cyclones. Lastly, those that form over the Atlantic Ocean or eastern Pacific Ocean are referred to as hurricanes