the bromine test shows the presence of choose... . a positive bromine test appears as choose... . a negative bromine test appears as

Answer:

To convert centimeters (cm) to nanometers (nm), you can use the following conversion factor:

1 cm = 10,000 nm

Given that the distance between the centers of two oxygen atoms is 1.21 × 10^(-6) cm, we can convert this distance to nanometers as follows:

1.21 × 10^(-6) cm * 10,000 nm/cm = 12,100 nm

Therefore, the distance between the centers of the two oxygen atoms in an oxygen molecule is 12,100 nm.

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The measured quantity 0.0105 L has three significant figures. Significant figures are the digits in a measurement that convey precision, excluding leading zeros and trailing zeros without a decimal point.

In the measured quantity 0.0105 L, there are three significant figures. Significant figures are the digits in a measurement that indicate the precision and reliability of the value. The general rule for determining significant figures is as follows:

1. Non-zero digits are always significant. In this case, the digits "1", "0", and "5" are all non-zero and therefore significant.

2. Leading zeros (zeros at the beginning of a number) are not significant; they act as placeholders. In this measurement, the leading zero before the decimal point is not considered significant.

3. Zeros between significant digits are significant. There are no zeros between the significant digits "1", "0", and "5" in this case.

4. Trailing zeros (zeros at the end of a number) after a decimal point are significant. In this measurement, the trailing zero after the "5" is significant.

By applying these rules, we can determine that the measured quantity of 0.0105 L has three significant figures, representing the precision of the measurement to the hundredth place.

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If 130 mg/L of BFS (18.5% Fe by weight) is required for coagulation and there are 3 equivalent (eq) of H generated per mole of Fe, the amount of alkalinity destroyed can be calculated.

To calculate the amount of alkalinity destroyed, we need to determine the moles of Fe in 130 mg of BFS and then convert it to the equivalent amount of H generated. Since there are 3 eq of H generated per mole of Fe, we can use this information to find the equivalent amount of H.

First, we need to calculate the mass of Fe in 130 mg of BFS. Since BFS is 18.5% Fe by weight, the mass of Fe can be calculated as:

Mass of Fe = (18.5/100) x 130 mg

Next, we convert the mass of Fe to moles by using the molar mass of Fe:

Molar mass of Fe = 55.845 g/mol

Moles of Fe = Mass of Fe / Molar mass of Fe

Once we have the moles of Fe, we can calculate the equivalent moles of H generated:

Equivalent moles of H = Moles of Fe x 3

Finally, to determine the amount of alkalinity destroyed, we need to convert the equivalent moles of H to the corresponding amount of alkalinity. The amount of alkalinity is typically expressed in terms of equivalents (eq) or milliequivalents (meq).

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Answer:

A mole (mol) is the amount of a substance that contains 6.02 × 10 23 representative particles of that substance. The mole is the SI unit for the amount of a substance. There are, therefore, 6.02 × 10 23 water molecules in a mole of water molecules. Water (H2O) is made from 2 atoms of hydrogen and 1 atom of oxygen.

The cycle of citric acid Hydrogen atoms are transported to FAD during the conversion of succinate to fumarate. This process is catalyzed by a succinate dehydrogenase enzyme.

During the process of succinate dehydrogenation, succinate is oxidized to fumarate by losing electrons, which are transferred to FAD, reducing it to FADH2. This transfer of electrons from succinate to FAD is an oxidation-reduction reaction, also known as redox reaction. The energy released during this reaction is harnessed to generate ATP, which is an important energy currency for the cell. Succinate dehydrogenase is an enzyme complex that contains multiple subunits and cofactors, including flavin adenine dinucleotide (FAD) and iron-sulfur clusters. It is located in the inner mitochondrial membrane, which allows it to transfer electrons to the electron transport chain, leading to the production of ATP. It's important to note that the citric acid cycle is a crucial metabolic pathway that takes place in the mitochondria of eukaryotic cells, and it is also known as the TCA cycle or Krebs cycle. The cycle is a series of chemical reactions that converts acetyl-CoA, derived from carbohydrates, fats, and proteins, into carbon dioxide and water, releasing energy in the form of ATP, hydrogen atoms other high-energy molecules.

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Answer:

atomic watch

Explanation:

it is used for the measurement of time.

Answer:

\(\boxed {\boxed {\sf 6.4 \ atm}}\)

Explanation:

We are asked to find the pressure of a gas in a can given a change in temperature. We will use Gay-Lussac's Law, which states the pressure of a gas is directly proportional to the temperature. The formula for this law is:

\(\frac {P_1}{T_1}= \frac {P_2}{T_2}\)

Initially, the gas in the aerosol can has a pressure of 3.10 atmospheres at a temperature of 25 degrees Celsius.

\(\frac { 3.10 \ atm}{25 \textdegree C}=\frac{P_2}{T_2}\)

The temperature is increased to 52 degrees Celsius, but the pressure is unknown.

\(\frac { 3.10 \ atm}{25 \textdegree C}=\frac{P_2}{52 \textdegree C}\)

We are solving for the new pressure, so we must isolate the variable \(P_2\). It is being divided by 52 degrees Celsius. The inverse operation of division is multiplication, so we multiply both sides of the equation by 52 °C.

\(52 \textdegree C *\frac { 3.10 \ atm}{25 \textdegree C}=\frac{P_2}{52 \textdegree C} * 52 \textdegree C\)

\(52 \textdegree C *\frac { 3.10 \ atm}{25 \textdegree C}=P_2\)

The units of degrees Celsius cancel.

\(52 *\frac { 3.10 \ atm}{25}=P_2\)

\(52 *0.124 \ atm = P_2\)

\(6.448 \ atm = P_2\)

The original values of pressure and temperature have 2 and 3 significant figures. Our answer must be rounded to the least number of sig figs, which is 2. For the number we calculated, that is the tenths place. The 4 in the hundredth place tells us to leave the 4 in the tenths place.

\(6.4 \ atm \approx P_2\)

The gas pressure in the can at 52 degrees Celsius is approximately 6.4 atmospheres.

Answer:

1. Potassium, K.

2. Calcium, Ca.

3. Gallium, Ga.

4. Carbon, C.

5. Bromine, Br.

6. Barium, Ba.

7. Silicon, Si.

8. Gold, Au.

Explanation:

Atomic radius can be defined as a measure of the size (distance) of the atom of a chemical element such as hydrogen, oxygen, carbon, nitrogen etc, typically from the nucleus to the valence electrons. The atomic radius of a chemical element decreases across the periodic table, typically from alkali metals (group one elements such as hydrogen, lithium and sodium) to noble gases (group eight elements such as argon, helium and neon). Also, the atomic radius of a chemical element increases down each group of the periodic table, typically from top to bottom (column).

Additionally, the unit of measurement of the atomic radius of chemical elements is picometers (1 pm = 10 - 12 m).

1. Li or K: the atomic radius of lithium is 167 pm while that of potassium is 243 pm.

2. Ca or Ni: the atomic radius of calcium is 194 pm while that of nickel is 149 pm.

3. Ga or B: the atomic radius of gallium is 136 pm while that of boron is 87 pm.

4. O or C: the atomic radius of oxygen is 48 pm while that of carbon is 67 pm.

5. Cl or Br: the atomic radius of chlorine is 79 pm while that of bromine is 94 pm.

6. Be or Ba: the atomic radius of berryllium is 112 pm while that of barium is 253 pm.

7. Si or S: the atomic radius of silicon is 111 pm while that of sulphur is 88 pm.

8. Fe or Au: the atomic radius of iron is 156 pm while that of gold is 174 pm.

The atoms in each pair which has the larger atomic radius is;

Definition:

Atomic radius is simply the distance from the centre of the nucleus to the outermost shell containing electrons.

In other words, the atomic radius is the distance from the center of the nucleus to the point up to which the electron cloud density is maximum.

Trend:

The atomic radius of atoms generally decreases from left to right across a period. The atomic radius of atoms generally increases from top to bottom within a group.

It is on this basis that atoms with the larger atomic radius are determined

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Answer:

file link http/www.openfree

0.0305mol of carbon dioxide can be produced when 3.05 mole of calcium carbonate are heated.

Carbon dioxide is a chemically compound made up of molecules that each one have  one carbon atomclick covalently double bonded to two oxygen atoms. It is founded in the gas state at room temperature. In the air, carbon dioxide is to the  transparent to visible light of the  but absorbs infra-red by radiation, acting as the  greenhouse gas.

CaCO3 ---> CaO + CO2

Mass of CaCO3 mol = 40 + 12 + (16 x 3) = 100g/mol

Number of CaCO3 moles heated = 3.05/100 = 0.0305 mol

One CaCO3 mol produces 1 mol CO2

Therefore 0.0305mol  of CO2 produced.

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The reactions produce a basic solution by generating hydroxide ions. Reactions a, b, c, and d produce a basic solution with the presence of hydroxide ions. Here are the reactions involving the given compounds with cold water:

a. Na(s) + H2O(l) → NaOH(aq) + H2(g)
b. NaH(s) + H2O(l) → NaOH(aq) + H2(g)
c. Na2O(s) + H2O(l) → 2NaOH(aq)
d. Mg(s) + 2H2O(l) → Mg(OH)2(aq) + H2(g)
e. Ni(s) + H2O(l) → No reaction

Now, let's analyze each reaction to see if it produces a basic solution:

a. Sodium (Na) reacts with water to form sodium hydroxide (NaOH), which releases hydroxide ions (OH-), making the solution basic.

b. Sodium hydride (NaH) reacts with water to form sodium hydroxide (NaOH), which releases hydroxide ions (OH-), making the solution basic.

c. Sodium oxide (Na2O) reacts with water to form sodium hydroxide (NaOH), which releases hydroxide ions (OH-), making the solution basic.

d. Magnesium (Mg) reacts with water to form magnesium hydroxide (Mg(OH)2), which releases hydroxide ions (OH-), making the solution basic.

e. Nickel (Ni) does not react with cold water, so there is no production of hydroxide ions and no change in the solution's pH.

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Answer:

The correct answer is A

Explanation:

A radio telescope is used to detect, collect and focus radio waves from distant objects in the sky or space. While a compound telescope, by design, can both refract and reflect waves. A reflection telescope uses curved mirrors to reflect light to form an image. A refraction telescope forms an image using a lens as its objective.

From the above definitions, it can be deduced that option A is the correct answer.

Answer:

of the Sun 4, 2, 6, 1, 5 and 3. Starting with the heat from the sun (4), the process of evaporation takes place (2). In this process, heat from the Sun evaporates water from the rivers, oceans, lakes, ice, and soil into water vapor.

Explanation:

and his transformation into a bug represents a more gradual transformation into a unique human being.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of gold = 6.39 cm³

density = 19.32 g/cm³

The mass is

mass = 19.32 × 6.39 = 123.4548

We have the final answer as

Hope this helps you

The site on a patient's forearm that has been cleaned with iodine and alcohol before starting an IV is said to be Medically clean.

In order to reduce the possibility of introducing hazardous bacteria during the IV insertions, the region is cleaned with iodine and alcohol. While alcohol acts as a disinfectant to cleanse the skin, iodine is frequently used as an antiseptic agent to kill or inhibit the growth of microorganisms.

Healthcare experts strive to reduce the likelihood of infections or difficulties connected to the IV process by thoroughly preparing and cleaning the aseptic site, assuring patient safety and top-notch healthcare delivery.

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Answer:

Explained below

Explanation:

Normally, when the temperature of water gets colder than 4° C, it starts expanding and will become less dense the colder it becomes. As the temperature gets closer to freezing point, the colder water will float to the top and the warmer water sinks to the bottom. This is mainly because of how the density of water behaves with falling temperatures.

Thus, the lake/river water will freeze from top to down as a a result of that phenomenon of colder water floating to the top and the warmer water sinking to the bottom.

Answer:

c.

Explanation:

Answer:

6NO2+3H2O-------->3HNO2+3HNO3

Answer:

renewable reaources can be renewable meaning u can make more and it wont run out unlike nonrenewable reaources

The statement more CO₂ dissolves in the blood plasma than is carried in the RBCs is FALSE

CO₂ is produced as a waste product during cellular respiration, and it must be transported from the cells to the lungs for exhalation. In the blood, most of the CO₂ is transported in the form of bicarbonate ions (HCO₃-), which are produced when CO₂ reacts with water (H₂O) in the presence of the enzyme carbonic anhydrase.

This reaction occurs mainly inside the red blood cells (RBCs), where the enzyme is most abundant. The HCO₃- ions are then transported in the plasma, while some of the CO₂ also remains dissolved in the plasma.

Additionally, CO₂ concentrations are greater in venous blood than arterial blood, and its accumulation in the blood is associated with a decrease in pH due to the formation of carbonic acid (H₂CO₃). This decrease in pH can lead to acidosis and other health issues. Furthermore, hyperventilation decreases the concentration of CO₂ in the blood by increasing the rate of exhalation, which can be helpful in certain situations such as in treating respiratory acidosis.

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Answer:

solid: Relatively rigid, definite volume and shape. In a solid, the atoms and molecules are closely bonded that they vibrate in place but don't move around. liquids: Definite volume but able to change shape by flowing. In a liquid, the atoms and molecules are loosely bonded.

Explanation:

I hope this helps! :) if it does could you please mark me brainliest?

The combustion of methane, CH4, releases 890.4 kJ/mol. That is, when one mole of methane is burned, 890.4 kJ are given off to the surroundings. This means that the products have 890.4 kJ less than the reactants.

Combustion of one mole or 16 g of methane gas releases 810 kJ of heat energy. Thus, heat released by the combustion of 22.4 g of methane is 1134 kJ.

Combustion of a substance is its reaction with atmospheric oxygen producing carbon dioxide and water. Combustion of hydrocarbons gases takes places easily and can be burned easily for fuels.

The chemical equation of combustion of methane is written below:

\(\rm CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O\)

This is an exothermic process and heat is released from the reaction system.

The heat released by the combustion of one mole of methane is 810 kJ.

molar mass of methane = 16 g/mol

no.of moles in 22.4 g = 22.4/16 = 1.4 g

Thus, heat released by 1.4 moles = 1.4 ×810 kJ =1134 kJ.

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Answer:

The answer is

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\\)

From the question

mass = 4500 g

density = 20.5 g/cm³

We have

\(volume = \frac{4500 }{20.5} \\ = 219.51219...\)

We have the final answer as

Hope this helps you

Answer:

D. 45.0 g

Explanation:

In present reaction, 1 mol of N2 react with 3 moles of H2 to generate 2 moles of NH3

Thus, 2 moles of NH3 ≡ 3 moles  of H2

Therefore, 15 moles of NH3 ≡ (3×15)/2 = 22.5 moles of H2.

We know that, 1 mole of H2 ≡ 2 g

Therefore, 22.5 moles of H2 ≡ 2 × 22.5 = 45 g

Thus, 45 g of hydrogen are needed to produce 15.0 mol of ammonia, if the reaction goes to completion

the net charge on the given peptide can be calculated as follows:Ala (neutral) + Thr (neutral) + Leu (neutral) + Asp (negative) + Ala (neutral) + Lys (positive) + Pro (neutral) + Glu (negative) = -1Therefore, the net charge on the given peptide at pH 7.0 is -1.

The net charge at pH 7.0 on a peptide with the sequence ala-thr-leu-asp-ala-lys-pro-glu is -1. Peptides are short chains of amino acids. The charge on a peptide can be calculated by summing the charges on its constituent amino acids and adjusting for the pH of the solution. At pH 7.0, some amino acids have a positive charge (arginine, histidine, and lysine) while others have a negative charge (aspartate and glutamate). The remaining amino acids (alanine, threonine, leucine, and proline) are neutral. Therefore, the net charge on the given peptide can be calculated as follows:Ala (neutral) + Thr (neutral) + Leu (neutral) + Asp (negative) + Ala (neutral) + Lys (positive) + Pro (neutral) + Glu (negative) = -1Therefore, the net charge on the given peptide at pH 7.0 is -1.

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