sr-90 may be produced from an atomic bomb explosion. the half-life of sr-90 is 28.8 years. what fraction of the sr-90 originally produced by the first atomic bomb in july 1945 still remains as of july 2033?

Answer:

NaOH

Explanation:

NaOH is among the water soluble bases

Answer:

If this is for the "functional groups" question:

1. aldehyde

2. ketone

3. ester

4. carboxylic acid

Explanation:

Got them all right on edge.

The drop-down menus to identify the names of the structures in the table to the right

1. Aldehyde

2. Ketone

3. Ester

4. Carboxylic acid

A functional group in organic chemistry is a pool of atoms within molecules which bind jointly to react in predicted ways.

Examples of functional groups contain the group hydroxyl, ketone, amine, and ether.

Thus, these are the drop down menus.

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Answer:

choice D. Ionic, because valence electrons are transferred.

Explanation:

Answer:

99 g/mol

Explanation:

2 carbon atoms in one molecule means double all the other atoms

(12*2)+(35.5*2)+(1*4)=99g/mol

When filling a buret for a titration, first adjust the buret in the clamp so that it is vertical. Then, choose an appropriate funnel to add the titrant into the buret. The titrant should be filled to just above the zero mark on the buret, and the buret tip should be briefly opened to remove any bubbles.

After that, the buret can be adjusted to the desired volume and the titration can proceed. It is important to take note of the initial buret reading before starting the titration to ensure accurate measurement of the titrant volume.

When filling a buret for a titration, it is important to first adjust the buret in the clamp so that it is vertical and its tip is below eye level to ensure accurate volume measurements. Next, choose an appropriate method to add the titrant into the buret, such as using a funnel or a pipette.

It is important to avoid splashing or spilling the titrant to ensure accurate and precise measurements. The titrant should be filled above the zero mark on the buret and then slowly drained until the bottom of the meniscus is aligned with the zero mark.

This process is called "buret priming" and it helps to remove any air bubbles from the buret tip that can affect the accuracy of the measurements. Once the buret is primed and filled with the titrant, it is ready to be used for the titration.

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Answer:

2. examine the properties before and after the change

the complete statement in liquid spill cleanup is 1- Surround the area with barriers, then cover the spill. 2- Scoop up the material and place it in a container.

steps for liquid spill cleanup are:

Identify and assess the type of liquid spilled.

Put on appropriate personal protective equipment (PPE)

Alert others in the area and evacuate if necessary.

Surround the area with barriers, such as caution tape or cones, to prevent anyone from entering the area.

Use absorbent materials, such as sand, clay, or kitty litter, to cover the spill and contain it.

Scoop up the material and place it in a container for proper disposal.

Clean the area with a neutralizing agent if necessary.

Dispose of the waste in accordance with local and federal regulations.

Check for any remaining traces of the spill and clean if necessary.

Document the incident and make sure it is properly reported if required by regulations.

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I believe that's true.

The correct answer is (D) A) 198°C B) 22770 J. Equilibrium can be achieved in reversible reactions, where the reactants can form products and vice versa.

What is Equilibrium?

Equilibrium is a state of balance or stability in a system. In thermodynamics, it refers to a state in which the temperature, pressure, and concentration of the components of a system do not change with time. At equilibrium, the forward and reverse reactions occur at equal rates, and the system does not undergo any net change.

To solve this problem, we can use the principle of conservation of energy, which states that the total energy of a closed system is conserved, meaning that energy cannot be created or destroyed, only transferred from one form to another.

We can start by using the formula for heat exchange:

Q = mcΔT

where Q is the heat exchange, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature.

For the aluminum chunk, we have:

Q_aluminum = (100.0 g) x (0.903 J/g°C) x (450.0°C - T_eq)

For the ethyl alcohol, we have:

Q_ethanol = (100.0 g) x (2.44 J/g°C) x (T_eq - 80.0°C)

At equilibrium, the heat exchange of the system is zero, so we can set Q_aluminum = -Q_ethanol and solve for T_eq:

(100.0 g) x (0.903 J/g°C) x (450.0°C - T_eq) = -(100.0 g) x (2.44 J/g°C) x (T_eq - 80.0°C)

Solving for T_eq, we get:

T_eq = 198.4°C (rounded to one decimal place)

This is the equilibrium temperature of the mixture.

Q_aluminum = (100.0 g) x (0.903 J/g°C) x (450.0°C - 198.4°C) = 22770 J (rounded to the nearest 10 J)

Q_ethanol = (100.0 g) x (2.44 J/g°C) x (198.4°C - 80.0°C) = 22770 J (rounded to the nearest 10 J)

So the total heat exchange of the system is:

Q_total = Q_aluminum + Q_ethanol = 2 x 22770 J = 45540 J (rounded to the nearest 10 J)

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Answer:

mitosis?

Explanation:

Some single celled organisms make copies of themselves through mitosis

In unicellular organisms such as bacteria, mitosis is a type of asexual reproduction, making identical copies of a single cell. In multicellular organisms, mitosis produces more cells for growth and repair.

Answer:

Explanation:

Did you get the answer to the test, I have the same one but don’t understand the questions that well

Answer:

Temperature. An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules.

The final temperature of the bomb calorimeter is 30.9°C.

Combustion reactions are those reactions in which a compound completly decompose in to carbon dioxide and water molecule.

The final temperature will be calculated by using the equation:

Q = mc(T₂ – T₁), where

Q = relesed heat from calorimeter = 24kJ = 24000J

m = mass of calorimeter = 1.30kg = 1300g

c = specific heat of calorimeter = 3.41 J/(g°C)

T₁ = initial temperature of calorimeter = 25.5°C

T₂ = final temperature of calorimeter = to find?

On putting all these values on the above equation and calculate for T₂, we get

T₂ = 24000/(1300)(3.41) + 25.5

T₂ = 30.9°C

Hence, correct option is (1) i.e. 30.9°C.

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Answer:

30.9

Explanation:

right on edge 2022

Answer:

H₂CO₃

Explanation:

Water + Carbon di oxide

H20+ CO2

= H2CO3

The mass number is the atomic mass rounded to a whole number, i.e., which is a value that rounds the atomic weight to a near number.

The expression mass number is used in chemistry to denote the total amount of subatomic particles i.e. atomic protons and neutrons, which are present in a given atom (for example hydrogen has only one proton and one neutron).

Therefore, with this data, we can see that mass number denotes the overall amount of protons and neutrons present in a given atom, which is equal to one in the hydrogen atom

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P-aminophenol has a molar mass of 109.13 g/mol. Acetaminophen has a molar mass of 151.17 g/mol. Acetic anhydride has a capacity of 1.1 mL.

The mass of acetaminophen, stated as 0.157g, must be multiplied by the molar mass of acetaminophen to get the theoretical yield. It weighs 151.2g in this case. The theoretical yield thus becomes 0.217g.

A measurement called production yield is obtained by dividing the number of high-quality parts produced by the total number of parts started in production.

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If excess ammonium sulfate reacts with 20.0g of calcium hydroxide then liters of ammonia are produced at STP 0.081L

Ammonium sulphate is the organic solvent and the primary use of ammonium sulphate is as a fertilizer for alkaline soils

Here given reaction is

(NH₄)₂SO₄ + Ca(OH)₂ → CaSO₄ + NH₃ + H₂O

Here given data is

Calcium hydroxide  = 20.0g

We have to find liters of ammonia are produced at STP =?

20.0g of (NH₄)₂SO₄ STP = ?

Then 20.0g of (NH₄)₂SO₄×1 mol/132g×0.54L/1 mol = 0.081L

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One mole of fluorine gas contains 1.204 x 10^24 diatomic molecules of fluorine. Where each molecule consists of two fluorine atoms bonded together.

One mole of any substance contains Avogadro's number of particles, which is around equivalent to 6.02 x 10^23 particles. On account of fluorine gas, every particle of fluorine gas comprises of two fluorine iotas reinforced together to shape a diatomic particle. Thusly, one mole of fluorine gas would contain Avogadro's number of diatomic atoms, which is equivalent to twice Avogadro's number. Hence, there would be 2 x 6.02 x 10^23 or 1.204 x 10^24 particles of fluorine in one mole of fluorine gas. This is an essential idea in science and is utilized to change over between the quantity of particles and how much substance in a given example.

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Explanation:

Ammonium Fluoride and Potassium Sulphate

The following actions describe deposition as flowing soil or mud due to gravity. Option D.

Sedimentation is the accumulation of sediments carried by the wind running water sea or ice. Sediments are carried as pebbles sand mud, or dissolved salts in water. A deposition is the direct transition of a substance from the gaseous state to the solid state on cooling without going through the liquid state.

Sedimentation is the geological process in which sediments soils and rocks are added to form landforms or land masses. Wind ice water and gravity cause previously weathered surface material to deposit and lose sufficient kinetic energy within the fluid to form a layer of sediment. Several factors influence how sediment settles. Sediment is removed from new surface locations. Precipitation is the change of state of a gaseous substance into a solid.

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Rotation refers to the movement of an object rotating around its own axis. Rotation refers to the orbital motion of an object around another object.

When the earth rotates it moves or revolves around the sun. The Earth's orbit around the Sun is called an orbit. It takes one year or 365 1/4 days for the Earth to make a complete orbit around the Sun. The moon revolves around the earth as the earth revolves around the sun. This is because the earth accelerates and decelerates as it orbits the sun.

Most of the apparent motion of the Sun comes from the Earth's rotation. As our planet rotates, the sun, moon, and all the stars appear to move from east to west, as if they were spinning in an office chair, while the walls all move in the opposite direction. It looks like you are. It is important to understand the difference between twists and turns. Rotating an object around its internal axis is called rotation. When an object orbits its outer axis it is called rotation.

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Answer:

the blanket let's him slide it across the floor because the has less friction with the floor than the furniture.

Answer:

Blanket underneath the furniture may reduce the kinetic friction

Explanation:

When sliding an object across a surface, the force of kinetic friction will oppose the movement of the object.

By placing a blanket between the object and the surface, the kinetic friction coefficient may be reduced.

Therefore, putting a blanket underneath the furniture may reduce the kinetic friction coefficient, then making it easier to slide the forniture.

(Hi fyi this answer took a lot of time & effort to make sure it was accurate, precise and to the point to be produced, so if you could opt this answer as the brainliest it would mean the world to me,)

Stay positive and Take care,

A fellow mate,

Cheers !

Answer:

89.3 %

Explanation:

M(CH4) = 12+ 4*1 = 16 g/mol

M(O2) = 2*16 = 32 g/mol

M(CO2) = 12 + 2*16 = 44 g/mol

8.50 g * 1 mol/16 g = 0.5313 mol CH4

15.9 g * 1 mol/32 g = 0.4969 mol O2

9.77 g * 1 mol/44 g = 0.2220 mol CO2

1)                                  CH4        + 2O2 -----> CO2 + 2H2O

from reaction             1 mol          2 mol

given                       0.5313 mol   (0.4969 mol)

1 mol CH4              --- 2 mol O2

0.5313 mol  CH4  --- x mol O2

x= 2*0.5313 = 1.0626 mol O2

We can see that for given amount of CH4 we do not have enough O2, so O2 is a limiting reactant.

2)                               CH4        + 2O2 -----> CO2 + 2H2O

from reaction                             2 mol        1 mol

given                                      0.4969 mol   x mol

x = 0.4969*1/2 = 0.2485 mol CO2 theoretical yield

3)

Practical yield CO2 = 0.2220 mol

Theoretical yield CO2 = 0.2485 mol

% yield = (0.2220/0.2485)*100% = 89.3 %

"Desert biome?" that's a funny way to put it. Well, the answer is most likely Mexico, United Stated, and Saudi arabia,

Mexico, Saudi Arabia and United States are countries which have a desert biome.

This is a barren area of landscape which is characterized by little precipitation and isn't best suited for plant or animal life.

Mexico, Saudi Arabia and United States all have the presence of desert biomes in some of its states.

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Answer:

this is the answer to your question bro or sis

Standardizing a sodium hydroxide solution is necessary because NaOH reacts with atmospheric carbon dioxide to form sodium carbonate and water, reducing the accuracy of its concentration.

We standardize a sodium hydroxide (NaOH) solution, which means we determine its exact concentration, because NaOH is a strong base that reacts with atmospheric carbon dioxide (CO₂) to form sodium carbonate (Na₂CO₃) and water (H₂O):

2NaOH (aq) + CO₂ (g) → Na₂CO₃ (aq) + H₂O (l)

This reaction reduces the concentration of NaOH in the solution, making it less accurate for titrations or other chemical analyses. Standardizing the NaOH solution involves titrating it with a known concentration of an acid, such as hydrochloric acid (HCl), using an appropriate indicator to determine the exact concentration of NaOH.

During the titration, the acid and base react in a 1:1 ratio according to the balanced chemical equation:

HCl (aq) + NaOH (aq) → NaCl (aq) + H₂O (l)

The endpoint of the titration is reached when all the HCl has reacted with the NaOH, and the solution becomes neutral. An indicator, such as phenolphthalein, is used to signal the endpoint of the titration, where the indicator changes color from pink to colorless. The volume of acid required to reach the endpoint is measured, and the concentration of NaOH is calculated using stoichiometry.

Standardizing the NaOH solution ensures that its concentration is accurately known, allowing it to be used in subsequent chemical reactions or analyses. It is important to standardize the NaOH solution periodically, as the concentration can change over time due to factors such as atmospheric carbon dioxide absorption, water absorption, or contamination.

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Answer:

B

Explanation:

the reaction is endothermic because of the temperature drop and the enthralpy is negative because its an endothermic reaction.

I did some research so I believe this to be correct but if its no I'm sorry

Answer:

The right objective is A I guess

Answer:

A. Heat energy to kinetic energy

Explanation:

The pyruvate dehydrogenase complex catalyzes the overall process of pyruvate + CoA + NAD+ ---> acetyl CoA + NADH.

Dehydrogenase is utilized where?

Dehydrogenases are a class of enzymes that operate as biological catalysts in oxido-reduction reactions by eliminating hydrogen atoms (H) rather than oxygen (O). It is a flexible enzyme in the electron transfer chain or the respiratory chain route.

The function of glucose dehydrogenase:

In the presence of cofactors such nicotinamide adenine dinucleotide (NAD), FAD, or pyrroloquinoline quinone, GDH catalyzes the oxidation of glucose (PQQ). NADH is a product of GDH that can be detected by chromogenic, coulometric, or amperometric techniques.

Therefore, the pyruvate dehydrogenase complex catalyzes the overall process of pyruvate + CoA + NAD+ ---> acetyl CoA + NADH.

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