Little or no radioactivity appears in the first acid-soluble supernatant in any of the preparations. Explain.

Answer:

2 option

Explanation:

please mark me brainliest and 5 star

Answer:

0.0493 moles de Titanio

Explanation:

Primero, debemos hallar el volumen de la esfera. Usando la densidad podemos hallar la masa de titanio y usando la masa atómica encontraremos las moles de titanio:

Volumen de la esfera:

Volumen esfera  = 4/3π * Radio³

Volumen = 0.5236cm³

En m³ (1m³ = 1x10⁶cm³):

0.5236cm³ * (1m³ / 1x10⁶cm³) = 5.36x10⁻⁷m³

Masa en gramos:

5.36x10⁻⁷m³ * (4507kg / m³) = 2.36x10⁻³kg * (1000g / 1kg) = 2.36g de Titanio

Moles -Masa molar Ti: 47.867g/mol-:

2.36g de Titanio * (1mol / 47.867g) =

Answer:

4 sun , planet, moon are the components in the correct order

The equipment used for filtering and collecting the apple juice includes a beaker containing some apple puree, a measuring cylinder, and filter paper.

To set up the apparatus, the filter paper is folded and placed into a filter funnel, which is then placed in a clean conical flask. The apple puree is then carefully poured into the funnel, and the juice that passes through the filter paper is collected in a measuring cylinder. A labelled diagram of the apparatus used to filter and collect the juice from the apple puree is shown below.

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Unable to attach the picture

Answer:

The answer is maybe B hope it helps

The substances which are made up of only one kind of particle and have a fixed or constant structure is defined as the pure substance. Here One block has a greater volume than the other block so that the blocks are composed of different substances. The correct option is B.

The amount of space occupied by any three dimensional solid is known as the volume. These solids can be a cube, a cuboid, a cone, a cylinder or a sphere. It is simply how much space an object or substance takes up.

It is possible to have the volume without mass, such as an enclosed vacuum. The capacity of a container is not necessarily the same as its volume. It is the interior volume of a vessel. If you measure the exterior dimensions of the container, its volume is greater than its capacity.

Here the blocks are composed of different substances is indicated by the difference in the volume of the blocks.

Thus the correct option is B.

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Answer:

C. easily dissociates into ions when I’m solution

Explanation:

Strong acids are compounds that completely decompose when dissolved in water and produce the total number of ions.

Answer:

1) It gets slower the farther out they are.

2) The farther out you are from the sun the less gravitational pull you have, which makes it go slower as it orbits.

3) Gravity ;) :)

Explanation:

Hope this helps! Plz mark as brainliest! :)

1.) The four inner planets have slower orbits and the four outer planets have faster orbits.

2.) The closer a planet is to the Sun, the stronger the Sun's gravitational pull on it, and the faster the planet moves.

3.) Gravity

Yes, the availability of oxygen and a high energy charge are required to obtain energy from acetyl CoA in the citric acid cycle.

During the citric acid cycle, the acetyl CoA is oxidized into carbon dioxide and water, which releases a large amount of energy in the form of ATP. This process occurs in the mitochondria of eukaryotic cells and requires a continuous supply of oxygen.

The availability of oxygen is essential as it serves as the final electron acceptor in the electron transport chain, which is responsible for generating the high energy charge in the form of ATP. Without oxygen, the electron transport chain cannot function, leading to a buildup of high energy intermediates that can be harmful to the cell.

A high energy charge is required for the citric acid cycle to proceed as it requires a large amount of ATP to drive the different reactions. The energy charge is maintained by the balance between ATP production and consumption within the cell. If the energy charge drops too low, the citric acid cycle slows down, leading to a decrease in ATP production.

In summary, the availability of oxygen and a high energy charge are both essential for obtaining energy from acetyl CoA in the citric acid cycle

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Answer and Explanation:

2 mol of Fe(OH)3 produces 1 mol of Fe2(SO4)3  then 2.1 mol of Fe(OH)3 will produce (1)/(2) x 2.01 = 1.05 mol of Fe2(SO4)3  amount of H2O = (6)/(2) * 2.01 = 6.03 mol HO2

Answer:

too simple question i don't have book pen now otherwise solved it

Answer:

The more acidic the solution the faster it rusts. More Na = more rust

Explanation:

The answer is System.

When a scientific investigation is in progress, its used to perform and understand the natural phenomenon that goes on using the scientific method. Since this is a descriptive investigation, it provides a descriptive account of any system by looking at it without any prior knowledge to that subject. This method of investigation does not use a hypothesis. Thus, proves our answer correct.

Best of Luck!

Answer:

The answer is System.

Explanation:

When a scientific investigation is in progress, its used to perform and understand the natural phenomenon that goes on using the scientific method. Since this is a descriptive investigation, it provides a descriptive account of any system by looking at it without any prior knowledge to that subject. This method of investigation does not use a hypothesis. Thus, proves our answer correct.

It is accurate to state the following. Temperature is unaffected by a phase change. As a result, choice c) is accurate.

Phase transition is the process by which a substance transforms from one state—solid, liquid, or gas—to another. Every substance and substance has a precise range of temperatures and pressures at which it can change by one phase to another.

Energy changes are physical processes that cause a material to change its phase. The transformation frequently occurs at a particular temperature, usually known as the drug's melting or boiling point, as heat is used or removed.

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The Complete Question :

During a phase change, the temperature of a substance

a. increases

b. decreases

c. does not change

d. increases or decreases

The correct statement is: temperature is unaffected by a phase change.

As a result, during a phase change temperature does not change, this option is correct.

Phase transition is the process by which a substance transforms from one state—solid, liquid, or gas—to another. Every substance and substance has a precise range of temperatures and pressures at which it can change by one phase to another.

Energy changes are physical processes that cause a material to change its phase. The transformation frequently occurs at a particular temperature, usually known as the drug's melting or boiling point, as heat is used or removed.

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Answer:

0.00268 M

Explanation:

To find the new molarity, you need to (1) find the moles of CuSO₄ (via the molarity equation using the beginning molarity and volume) and then (2) find the new molarity (using the moles and combined volume). Your final answer should have 3 sig figs to match the given values.

Step 1:

3.00 mL / 1,000 = 0.00300 L

Molarity = moles / volume (L)

0.0250 M = moles / 0.00300 L

(0.0250 M) x (0.00300 L) = moles

7.50 x 10⁻⁵ = moles

Step 2:

25.0 mL / 1,000 = 0.0250 L

0.0250 L + 0.00300 L = 0.0280 L

Molarity = moles / volume (L)

Molarity = (7.50 x 10⁻⁵ moles) / (0.0280 L)

Molarity = 0.00268 M

Answer:

Her speed is 6.8m/s.

Explanation:

K.E= 1/2mv²

or, 2543.2= 1/2×110×v²

or, 2543.2 = 55v²

or, 2543.2/55 = v²

or, 46.24 = v²

or, 6.8² = v²

v = 6.8 m/s

answer

6.8

explanation

k.e=1/2v^2

2543.2=55v^2

46.24=v^2

6.8^2=v^2

v=6.8

Answer:

The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.

Explanation:

Your answer should be- that in a chemical reaction mass is neither created nor destroyed.

Explanation:

Is that good?

When the compound reacts with N-bromosuccinimide (NBS) in the presence of light, a bromine atom is added to the molecule, generating a radical. The reaction occurs at the weakest CH bond.

To depict the resonance structures for the resulting radical, you need to consider the possible locations of the unpaired electron (radical electron) within the molecule. The electron can be delocalized or shared among adjacent atoms through resonance.

Here is a textual representation of the resonance structures for the radical:

Resonance Structure 1:

C

|

C - C - C - C

|

R

(R represents the unpaired electron)

Resonance Structure 2:

C

|

C - C - C - C

|

R

(R represents the unpaired electron)

In these structures, the unpaired electron (R) can be located on any of the carbon atoms within the chain. The electron can shift between these carbon atoms due to resonance, resulting in multiple resonance structures.

Without the specific molecular structure or the given compound's name, it is challenging to provide an accurate representation.

It is recommended to refer to a chemical drawing software or consult a chemistry textbook to obtain the precise resonance structures for a given compound in a reaction with N-bromosuccinimide (NBS).

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Out of the three elements you listed (aluminum, copper, and lead), lead would be the worst choice to use for pipes and fittings in a rainwater harvesting system.

Lead is highly reactive and prone to corrosion, which means it can break down and dissolve in water over time. When this happens, lead can leach into the water and be ingested by humans, animals, and plants. Lead is toxic and can have negative effects on the nervous system and other organs, so it is important to avoid using materials that contain lead in situations where it could come into contact with drinking water.

Copper and aluminum, on the other hand, are less reactive and less prone to corrosion. Copper has antimicrobial properties that can help prevent the growth of bacteria and other organisms in the water, and it is often used in plumbing systems for this reason. Aluminum is also a good choice for pipes and fittings in a rainwater harvesting system because it is lightweight, strong, and resistant to corrosion.

In terms of periodic trends, aluminum is the most electronegative element of the three, which means it is more likely to gain electrons and form positive ions. Copper is less electronegative and has a higher electron affinity, which means it is more likely to form negative ions when it reacts with other elements. Lead is less electronegative and has a lower electron affinity than copper, so it is less likely to form ions.

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A chemist dissolves 468.mg of pure hydroiodic acid in enough water to make up 170.ml of solution. The PH of the solution is 1.13.

Let's determine the pH step-by-step:

The steps to determine the PH of the solution are given below:

Step 1: The molar mass of hydroiodic acid is 127.91 g/mol.

Step 2: First, calculate the number of moles of hydroiodic acid. Moles of HIA= 468mg / (127.91g/mol)= 0.00366mol

Step 3: Since the volume of the solution is given, calculate the molarity of hydroiodic acid.

Molarity= Moles of HIA/ Volume of solution (L)= 0.00366mol/ 0.170L= 0.0216M

Step 4: Hydroiodic acid is a strong acid, its dissociation is complete. Therefore, [H+]= 0.0216M

Step 5: Calculate the PH of the solution using the formula below: PH = -log[H+]= -log(0.0216) = 1.13

Therefore, the PH of the solution is 1.13.

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One example of two organisms and their adaptations are the polar bear and the arctic fox, both of which inhabit the harsh, icy environment of the Arctic.

The polar bear has a thick layer of insulating fur, which helps it retain body heat in the cold temperatures. It also has large paws that act like snowshoes, allowing it to move over snow and ice more easily.

The polar bear's sense of smell is also highly developed, allowing it to detect prey from far distances. These adaptations help the polar bear survive in its cold, snowy habitat by keeping it warm and aiding in its ability to hunt for food.

The arctic fox also has several adaptations that allow it to survive in the Arctic. Its fur changes color from brown in the summer to white in the winter, providing camouflage against the snow. The fox's paws are covered in fur to provide insulation and better traction on the slippery ice.

The fox's diet is also highly adaptable, allowing it to survive on a variety of prey, from lemmings to birds to fish. These adaptations help the arctic fox survive in the harsh Arctic environment by helping it blend in, move more efficiently, and find food.

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Answer: London dispersion forces of molecular attraction is the weakest.

Explanation:

The forces which exist between neighboring atoms, molecules or ions can be force of attraction or force of repulsion. These forces are called intermolecular forces.  

When ions with same charge come in contact with each other then force of repulsion is there but when ions with opposite charge comes in contact with each other then force of attraction will be there.

These forces are described as follows.

London dispersion forces: The electrostatic attraction between atoms or molecules causes a temporary induced charge on the respective atoms. These attractive forces are weak in nature and called London dispersion forces.

Hydrogen bond: When a hydrogen atom is attached to electronegative atom like fluorine, nitrogen and oxygen then bonding between these atoms is called a hydrogen bond.

Dipole-dipole interaction: When positive end of one polar molecule gets attracted by the negative end of another polar molecule then force existing between these ends is called dipole-dipole interaction.

Single covalent bond: When an atom is sharing its valence electrons with another atom then it is called a covalent bond.

Thus, we can conclude that London dispersion forces of molecular attraction is the weakest.

Answer:

I think it's the last one

D. The cell is prokaryotic because it does not have any membrane-bound organelles.

Explanation:

The difference between eukaryotic and prokaryotic cells are that the eukaryotic cells have a nucleus and they have membrane-bound organelles, and prokaryotic cells don't.

Hope this Helps!

Answer:

A. Na+ OH-

Explanation:

positive and negative ions form bonds because positive and negative attract

Answer:

640 grams

Explanation:

look up Solubility table in wikipedia for potassium nitrate (KNO3)

32 grams of potassium nitrate (KNO3) water solubility at 20 degrees celsius (room temperature) can be dissolved in 100 milliliters (0.1 L) of water.

2 liters = 2000 milliliters

32 grams / 100 milliliters = x grams / 2000 milliliters

cross-multiply

100 * x = 32 * 2000

x = (32 * 2000) / 100

x ≈ 640 grams

chatgpt

Answer:

5) A change in the state of matter is caused if enough what is added to or removed from a object.

A) thermal energy

C) potential energy

D) force

electrolytes

Potassium, magnesium, sodium, chloride, phosphorus, and calcium are all types of electrolytes that can be analyzed using serum or heparinized plasma.

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