Which of the following is NOT an example of proxy data?
A Fossils including pollen and leaves
B Corals
C weather data collected by sending weather balloons up in the atmosphere
D Ice cores
E Tree rings

Answer:

Gravitational force is given by:

F=G×

d

2

m×M

Distance between two masses is increased s.t. new distance is D= 5 d

New gravitational force F

1

=F

Let on of the mass is changed to m

1

so as to maintain the same gravitational force.

Answer:

D

Explanation:

F g increases by 25 times

Answer: There are 31.8 grams of copper.

Explanation:

Boric acid, B(OH)3, undergoes an unusual equilibrium in water. The equilibrium reaction that occurs between boric acid and water is:

B(OH)3 + H2O ⇌ B(OH)4− + H+ The reaction involves the acid-base equilibrium between the boric acid, B(OH)3, and water molecules, where the H+ ion is produced. The reaction diagram shows the change in potential energy during the reaction.

The potential energy of the boric acid, B(OH)3, is higher than that of its products. This means that energy must be released for the reaction to proceed.The equilibrium lies far to the left. This means that only a small amount of boric acid, B(OH)3, ionizes to produce H+ and B(OH)4− ions.

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Answer:

Beautiftul, begging under F

honest, beginning in thrid line under A

hopeful, fifth line under F

Explanation:

The larger the oligonucleotides , the less distance it will travel. Therefore, in the order of decreasing distance traveled:

AAACT → AGGGAAG → CTACGTGCG → TTTGCGTATTT → GTATGTTCACCCGTC

Oligonucleotides:

Oligonucleotides are short DNA or RNA molecules, oligomers, widely used in genetic testing, research, and forensics. Typically produced in the laboratory by solid-phase chemical synthesis, these small fragments of nucleic acids can be made into single-stranded molecules by user-specified sequences, making them essential for artificial gene synthesis, polymerase chain reaction (PCR), DNA sequencing, molecular cloning and molecular probes.

Oligonucleotides are chemically synthesized using building blocks, protected phosphonamidites, natural or chemically modified nucleosides or, to a lesser extent, non-nucleoside compounds. Assembly of the oligonucleotide chain occurs in the 3' to 5' direction according to a general procedure called the "synthetic cycle". The maximum length of synthetic oligonucleotides barely exceeds 200 nucleotide residues. Products can be isolated in any order using HPLC and other methods.

Complete Question:

Rank these oligonucleotides according to distance traveled in an electrophoretic separation

TTTGCGTATTT

AGGGAAG

GTATGTTCACCCGTC

CTACGTGCG

AAACT

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Answer:

b, their strong winds uproot many of the important plants

Explanation:

You should add 0.089 mol of silver fluoride to the 500 ml volumetric flask to get the desired concentration.

To make an aqueous solution of 0.178 M silver fluoride, you need to add a certain amount of silver fluoride to a known volume of water.

Since you want to make a 500 ml solution and the desired concentration is 0.178 M, you can use the formula:

molarity = moles of solute/liters of solution

Rearranging this equation to solve for moles of solute:

moles of solute = molarity x liters of solution

Therefore, to make a 0.178 M solution, you need to add:

moles of solute = (0.178 mol/L) x (0.5 L) = 0.089 mol

So you should add 0.089 mol of silver fluoride to the 500 ml volumetric flask to get the desired concentration.

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The Kush civilization was influenced by Egyptian civilization because the Kush conquered and ruled over much of Egypt

What kush was influenced by ?

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b) An independent structure which consists of two or more atoms covalently bonded to each other is called a molecule.

A group of two or more atoms that form the smallest identifiable is called a molecule and a unit in which a pure substance can be divided and still retain the composition of that substance and chemical properties of that substance. While an element is a substance which can not be divided into any simple substance and a compound is a substance made up of two or more elements in a fixed ratio. And when different elements came closer they react and make compounds.

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Answer:

Hydrocarbons

Explanation:

They all are made up of only carbon and hydrogen atoms, so they're organic molecules known as hydrocarbons. Decane and Heptane are alkanes, Propene is an alkene.

Based on the description provided by the science teacher, the correct flask is an Erlenmeyer flask. Erlenmeyer flasks have a flat bottom, a narrow opening, and a cone-shaped base.

The cone-shaped base helps in swirling the contents of the flask and prevents spills during the mixing of liquids. The narrow opening helps in controlling the rate of gas exchange and minimizes the risk of contamination. Erlenmeyer flasks are commonly used in chemistry laboratories for mixing, heating, and storing liquids. They are also used in the preparation of solutions and in titration experiments. Their design makes them easy to handle and they are also stackable, which saves flask space in the laboratory. Based on the description provided by the science teacher, the correct flask is an Erlenmeyer flask. Erlenmeyer flasks have a flat bottom, a narrow opening, and a cone-shaped base.

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Mendeleev's periodic table was helped more in creating modern periodic table as he arranged elements in the increasing order of atomic mass and moreover, he tried to arrange the elements on the basis of their reaction with hydrogen and oxygen because they are most reactive elements, react with most of other elements. In his period, 63 elements were known. So, this made quite easy for modern periodic table.

Here are some predictions of Mendeleev

Advantages of Mendeleev's periodic table

\({ \star}\)Elements were grouped on more fundamental basis.

\({ \star}\)Because of their placement in the periodic table, properties of several elements yet to be discovered like scandium, gallium and germanium could be predicted.

scandium predicted as Eka boron

gallium predicted as Eka aluminum

germanium predicted as Eka silicon

\({ \star}\)Gaps for 40 new elements were kept.

\({ \star}\)The discovery of new elements inert gases did not disturbed the arrangement and they found their place as a new group.

Answer:

Explanation:

Soon, Mendeleev was predicting the properties of three elements – gallium, scandium and germanium – that had not then been discovered. So convinced was he of the soundness of his periodic law that he left gaps for these elements in his table.

The term mole concept is used here to determine the theoretical yield of H₂. The theoretical yield of H₂ is 1.75 g and the moles of Fe is 10.8. The correct options are D and C.

One mole of a substance is defined as that amount of it which contains as many particles or entities as there are atoms in exactly 12 g of Carbon - 12. The equation used to calculate the number of moles is:

Number of moles (n) = Given mass / Molar mass

The theoretical yield of H₂ is:

1. 3.5 × 1/2 = 1.75 g

2. The moles of Fe needed to react with 8.1 mole of O₂ is:

8.1 × 4 / 3 = 10.8 mole

Thus the correct options are D and C.

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To solve such this we must know the concept of double displacement reaction. Therefore, the blank should be filled with word chemical.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved.

There are so many types of chemical reaction reaction like combination reaction, double displacement reaction. In a chemical reaction, two or more elements or compounds form one product.

Therefore, the blank should be filled with word chemical.

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Using the periodic table the number of electrons is determined as;

Fluorine (F) has 5 electrons in 2p orbital.

Silicon (Si) has 2 electrons in 3p orbital.

Iron (Fe) has 6 electrons in 3d orbital.

Krypton (Kr) has 6 electrons in 4p orbital.

The number of electrons in each orbital or the electronic configuration can be determined by the Aufbau principle, along with other principles such as the Pauli exclusion principle and Hund's rule.

1. The atomic number of Fluorine is 9, which means it has 9 electrons. In the ground state, 2 electrons are in the 1s orbital, 2 electrons are in the 2s orbital, and 5 electrons are in the 2p orbital. Therefore, the number of 2p electrons in F is 5.

2. The atomic number of Silicon is 14, which means it has 14 electrons. In the ground state, 2 electrons are in the 1s orbital, 2 electrons are in the 2s orbital, 6 electrons are in the 2p orbital, and 2 electrons are in the 3s orbital. Therefore, the number of 3p electrons in Si is 2.

3. The atomic number of Iron is 26, which means it has 26 electrons. In the ground state, 2 electrons are in the 1s orbital, 2 electrons are in the 2s orbital, 6 electrons are in the 2p orbital, 2 electrons are in the 3s orbital, and 6 electrons are in the 3p orbital. Therefore, the number of 3d electrons in Fe is 6.

4. The atomic number of Krypton is 36, which means it has 36 electrons. In the ground state, 2 electrons are in the 1s orbital, 2 electrons are in the 2s orbital, 6 electrons are in the 2p orbital, 2 electrons are in the 3s orbital, 6 electrons are in the 3p orbital, 10 electrons are in the 3d orbital, and 2 electrons are in the 4s orbital. Therefore, the number of 4p electrons in Kr is 6.

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Answer:

mass in a given volume

Explanation:

Density is the mass in a given volume or mass per unit volume of a substance.

Mass is defined by the amount of matter present in a substance.

Volume is the space occupied by a body.

Mathematically;

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

Answer:

hi I dont see princess or sara but have a good day!

Answer:

Hola chica

¿Qué paso?

Dimelo

The total number of valence electrons for \(PBr_3\) is: 26. Each bromine atom will have 3 lone pairs (6 electrons), and phosphorus will have 2 lone pairs (4 electrons).

To draw the Lewis structure of \(PBr_3\) (phosphorus tribromide), we need to determine the total number of valence electrons for the molecule. Phosphorus (P) is in Group 5A and has 5 valence electrons, while each bromine atom (Br) is in Group 7A and has 7 valence electrons.

1(P) + 3(Br) = 1(5) + 3(7) = 26

In the Lewis structure, we will first place the atoms and then distribute the remaining electrons as lone pairs and bonding pairs.

Place the central atom: Phosphorus (P)

Attach the three bromine (Br) atoms around the phosphorus atom, ensuring that each bromine atom has a single bond with phosphorus (P-Br). Distribute the remaining electrons as lone pairs around the atoms to satisfy the octet rule.

      Br

       |

Br – P – Br

       |

      Br

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Answer:

The answer is (3) 1676 kJ. The heats of reaction at 101.3 kPa and 298 K for reaction: 4Al(s) +3O2(g)= 2Al2O3(s) is -3351 kJ. So for one mole of aluminum oxide is 3351/2=1676 kJ.

True. Copper does indeed play a role in connective tissue formation as a component of lysyl oxidase.

Copper is an essential trace element that is involved in various biological processes in the human body. One of its crucial roles is as a component of lysyl oxidase, an enzyme responsible for the cross-linking of collagen and elastin in connective tissues. Collagen and elastin are key components of connective tissue, providing strength, elasticity, and structural support to various body parts such as skin, blood vessels, tendons, and ligaments.

Lysyl oxidase requires copper as a cofactor to catalyze the chemical reactions that facilitate the cross-linking process. Without sufficient copper, the activity of lysyl oxidase can be impaired, leading to abnormalities in connective tissue formation and function. Therefore, it is true that copper plays a vital role in connective tissue formation as a component of lysyl oxidase.

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The balanced for the reaction is:

2KI + Pb(NO₃)₂ → Pbl₂ + 2KNO₃

When the equation is balanced, the number of atoms for each element on both the reactant and product sides of the equation are equal. This can be seen below:

      Reactant   Product

K         2                 2

I          2                  2

Pb      1                    1

N       2                   2

O       6                  6

Answer: The volume \((V_{1})\) of 1.00 mol of helium at 273 K is 22.4 L and the final volume \((V_{2})\) is 44.8 L.

Explanation:

Given: \(T_{1}\) = 273 K,   \(n_{1}\) = 1.00 mol

\(T_{2}\) = 273 K,         \(n_{2}\) = 2.00 mol

At the standard pressure, 1 atm the value of \(V_{1}\) and \(V_{2}\) is calculated as follows.

\(V_{1} = \frac{n_{1}RT_{1}}{P}\\= \frac{1.00 mol \times 0.0821 Latm/mol K \times 273 K}{1 atm}\\= 22.4 L\)

Similarly,

\(V_{1} = \frac{n_{2}RT_{2}}{P}\\= \frac{2.00 mol \times 0.0821 Latm/mol K \times 273 K}{1 atm}\\= 44.8 L\)

Thus, we can conclude that the volume \((V_{1})\) of 1.00 mol of helium at 273 K is 22.4 L and the final volume \((V_{2})\) is 44.8 L.

Flash point alone cannot establish the identity of a petroleum product. CNG can be piped for transportation due to its gaseous state, while LNG requires cryogenic storage. Shale oil extraction has adverse environmental impacts. Low-temperature heat recovery systems face challenges. Controlled fission reactions generate electricity in nuclear reactors.

1. No, the flash point alone cannot establish the identity of a particular petroleum product. The flash point is the temperature at which a substance's vapor can ignite when exposed to an open flame.

While different petroleum products may have different flash points, there can be overlapping ranges, making it insufficient to determine the specific identity of a product. Other characteristics such as chemical composition, boiling point, and density are needed for accurate identification.

2. CNG (Compressed Natural Gas) can be piped for transportation because it remains in a gaseous state at normal temperature and pressure. It can be compressed and stored in high-pressure tanks, allowing for convenient pipeline transportation.

On the other hand, LNG (Liquefied Natural Gas) needs to be stored and transported at cryogenic temperatures below its boiling point (-162 °C or -260 °F). This requires specialized infrastructure and storage facilities, making pipeline transportation less practical.

3. Shale oil extraction, whether in-situ or ex-situ, is associated with adverse environmental impacts. In both methods, hydraulic fracturing (fracking) is typically used to extract oil from shale formations.

This process involves injecting large volumes of water, chemicals, and sand underground, which can contaminate groundwater and pose risks to ecosystems. Additionally, the extraction and processing of shale oil generate greenhouse gas emissions, contribute to habitat destruction, and can cause air and water pollution.

4. Low temperature heat recovery systems may not be widely adopted due to various reasons. First, the implementation and maintenance costs of such systems can be high, which may deter their widespread adoption. Second, the efficiency of low-temperature heat recovery is lower compared to higher temperature systems, resulting in lower energy recovery potential.

Lastly, there may be limited applications or industries where low-temperature heat recovery is feasible and economically viable, further limiting its acceptance.

5. Controlled fission reactions in nuclear reactors generate electricity through a process called nuclear fission. In a nuclear reactor, typically fueled by uranium or plutonium, the nucleus of a heavy atom is bombarded with neutrons, causing it to split into smaller fragments and releasing a large amount of energy.

This energy is converted into heat, which is used to generate steam. The steam then drives a turbine connected to a generator, producing electricity. The fission process is carefully controlled to prevent uncontrolled chain reactions and ensure a steady and safe production of heat and electricity.

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Answer: 4 ATP molecules is produced in the glycolysis of 2 glucose molecules

The first stage of most carbohydrate catabolism, which is described as the breakdown of larger molecules into smaller ones, is glycolysis, which is a part of cellular respiration. Two Greek words that mean "to break down anything sweet" are the source of the word glycolysis. Two molecules of ATP are created during the breakdown of glucose and formation of pyruvate during glycolysis.

Explanation:

2 ATP are produced.

For every glucose molecule, meaning that for every 2 glucose molecules, 4 ATP will be created.

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Answer:

Iron (III) oxide reacts with carbon monoxide according to the balanced equation: Fe2O3 + 3CO

Answer:

they can get food easily and they can pack the predators to help them with their safty!♥