Sodium fluoride inhibits the enolase reaction. a. Write out the reaction involved, giving structures and naming the compounds 
b. When this enzyme is inhibited, which intermediates in glycolysis would you expect to increase in concentration, and which ones would you expect to decrease?

The mass of sodium-24 at 8 hours after the initial experiment will be 2.2664 mg

Since we know that the initial mass of sodium-24 in a sample is  5mg, along it is said that every 15 hours there is a 15%  decrease in mass.Therefore 15%  of mass = (15/100)*5mg =0.15*5  = 0.75 mg

so after 15 hours the mass will be = 5-0.75mg = 4.25 mg, now applying the unitary method, which is a technique, where first we find the  value of a single unit and then find the necessary value by multiplying the single unit value:

15 hours = 4.25

 1 hours = 4.25 /15 mg = 0.2833 mg

 8 hours = 0.2833*8 mg  = 2.2664 mg

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the mass of the radioactive isotope sodium 24 is initially measured a 5 mg. if the mass of sodium 24 decreases 15% every 15 hours, which of the following is closest to the mass of the sodium-24 in the sample 8 hours after the initial measurement?

Answer:

3 and 6 (weight change and nothing changes)

Explanation:

Hi there!

A chemical change is a change when matter changes into a new substance and has a new chemical property.

The signs that a chemical change is taking place are:

1. change in color

2. change in smell

3. change in energy (for example, there is a change in temperature (thermal energy))

4. a gas is formed (fizzing/bubbling/foaming are signs of this!)

5. formation of a solid (a precipitate)

A physical change is any change to the size, shape, or state of a substance. The substance still has the same chemical property.

these are your eight options:

1. tarnished is formed (a sign of a chemical change; a change in color)

2. gas is produced (a sign of a chemical change)

3. weight change (NOT a sign of a chemical change. Even though the weight changed, the substance still has the same chemical composition and therefore, there wasn't any change to its chemical identity)

4. Temperature change (a sign of a chemical change; a change in energy)

5. color change (a sign of a chemical change)

6. nothing changes (NOT a sign of a chemical change. If nothing happens, the substance is still the same as it was originally and there was no change to its chemical identity.)

7. forms a precipitate (a sign of a chemical change)

8. energy is released (a sign of a chemical change)

therefore the two options that are NOT a sign of a chemical change are 3 and 6 (weight change and nothing changes)

Hope this helps! :)

The correct options for naming an ionic compound are:

The cation is named first and the anion second.

For a monatomic cation, the element name is unchanged.

For a monatomic anion, the element name is changed to end in -ide.

When naming an ionic compound, the cation (positive ion) is always named first, followed by the anion (negative ion). For monatomic cations, the element name remains the same. For example, Na^+ is simply called sodium.

On the other hand, for monatomic anions, the element name is modified to end in -ide. For example, Cl^- is named chloride. Greek prefixes are not used to indicate the number of atoms of a particular element present in ionic compounds.

Therefore, the correct options are: the cation is named first and the anion second, and for monatomic anions, the element name is changed to end in -ide.

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(a) The % solids in the leach feed is 90%.

(b) The wt.% Ni in the leach residue is 0%.

(a) The % solids in the leach feed:

To calculate the % solids in the leach feed, we need to consider the mass balance of the process.

Given:

Ore feed rate: 5,000 TPD

Ni extraction: 90%

Leach solution production rate: 6,500 TPD

We can start by calculating the amount of Ni entering the leach solution:

Ni entering leach solution = Ore feed rate * Ni content

= 5,000 TPD * 1.5 wt.% = 75 TPD

Since the Ni extraction is 90%, the Ni content in the leach solution after extraction can be calculated as:

Ni in leach solution = Ni entering leach solution * Ni extraction

= 75 TPD * 90% = 67.5 TPD

Next, we need to calculate the amount of solids in the leach feed. We are given that the solids weight decreases by 10% during the leach. Let's assume the initial solids weight in the leach feed is S TPD.

After the leach, the solids weight becomes 90% of the initial weight, i.e., 0.9S TPD.

Now, we can set up a mass balance equation for the Ni in the leach feed:

Ni in leach feed = Ni in leach solution + Ni in leach residue

Since we know the Ni in the leach solution (67.5 TPD) and the Ni content in the leach feed (1.5 wt.%), we can solve for the solids weight (S):

Ni in leach feed = S TPD * 1.5 wt.%

S = Ni in leach feed / (1.5 wt.%)

= 67.5 TPD / (1.5 wt.%)

= 4,500 TPD

Finally, we can calculate the % solids in the leach feed:

% solids in leach feed = (S TPD / Ore feed rate) * 100

= (4,500 TPD / 5,000 TPD) * 100

= 90%

Therefore, the % solids in the leach feed is 90%.

(b) The wt.% Ni in the leach residue:

To calculate the wt.% Ni in the leach residue, we can use the information from part (a) and the mass balance equation:

Ni in leach residue = Ni in leach feed - Ni in leach solution

= 4,500 TPD * 1.5 wt.% - 67.5 TPD

= 6,750 TPD - 67.5 TPD

= 6,682.5 TPD

The weight of the leach residue can be calculated by subtracting the weight of the leach solution from the weight of the leach feed:

Weight of leach residue = Ore feed rate - Leach solution production rate

= 5,000 TPD - 6,500 TPD

= -1,500 TPD (negative value indicates there is no residue)

Since the weight of the leach residue is negative, it means there is no leach residue produced. Therefore, the wt.% Ni in the leach residue is 0%.

(a) The % solids in the leach feed is 90%.

(b) The wt.% Ni in the leach residue is 0%.

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Answer:

Valence electrons are the electrons orbiting the nucleus in the outermost atomic shell of an atom. Electrons that are closer to the nucleus are in filled orbitals and are called core electrons

Explanation:

yup

The change in internal energy of the gas is 123.7 J.

The change in internal energy of a gas can be calculated using the equation: ΔU = Q - W, where ΔU is the change in internal energy, Q is the heat added to or removed from the gas, and W is the work done on or by the gas.

In this case, the work done on the gas can be calculated as W = P * ΔV, where P is the pressure and ΔV is the change in volume. Since the pressure is 1.00 bar and the change in volume is 5.50 L - 1.20 L = 4.30 L, the work done on the gas is W = 1.00 bar * 4.30 L = 4.30 J.

Therefore, the change in internal energy of the gas is ΔU = Q - W = 128 J - 4.30 J = 123.7 J.

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The total number of bonding pairs and lone pairs of electrons in H2O2 is 9.

The bonding pairs and lone pairs of electrons in H2O2 are as follows:

The Lewis structure of H2O2 has two O atoms which are bonded to a central atom, which is an H atom.

There are three lone pairs of electrons on each O atom, and there is one lone pair of electrons on the central H atom.

How many bonding pairs of electrons are there in H2O2?

A single bond is formed by sharing one pair of electrons.

Each O atom shares a single pair of electrons with the central H atom, therefore, there are two bonding pairs of electrons in H2O2.

How many lone pairs of electrons are there in H2O2?

Lone pairs of electrons are pairs of electrons that are not involved in the bonding of a molecule.

Each O atom has three lone pairs of electrons, while the central H atom has only one lone pair of electrons, therefore there are seven lone pairs of electrons in H2O2.

So the total number of bonding pairs and lone pairs of electrons in H2O2 is 9.

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Because of these properties, cadmium (Cd) could also be identified as a transition metal.

Cadmium (Cd) is a solid at room temperature, forms an ion that has a +1 or +2 charge, is a less reactive metal, and forms more than one unique compound with a given nonmetal.

Transition metal, any of various chemical factors which have valence electrons i.e., electrons that can participate inside the formation of chemical bonds in two shells as opposed to simplest one.

Transition metals are determined within the periodic desk among the s-block and p-block elements. Hence, they are known as d-block elements. Transition metals are unstable metals that display transitional conduct between s and p block elements, therefore their name.

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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:

Answer:

Sodium is very reactive in nature. When exposed in air, it automatically forms Na2O. When it is put in water it reacts vigorously and starts burning on water. Due to the above reasons Sodium is called an active metal

Explanation: hope this helps pls mark as brainliest ty

Answer:

1. three-dimensional bonding

Diamond

2. Hardest natural substance

diamond

3. Used as lubricant

Graphite

4. nonconductor

Diamond

5. Weak, planar bonds

Graphite

6.Carbon black or soot

Amorphous

Explanation;

sorry im late, hopefully this can help somebody :)

Answer:

an element with a large number of valence electrons and a large atomic radius

Explanation:

Electronegativity means a tedency when an atom attracts bonding electrons in a covalent bond situation.

» If an atom has many valency electrons [ empty orbitals in outermost shell ], it has difficulty in attracting electrons hence electronegativity low.

» If an atom is large, its nuclear attraction force of incoming electrons is low hence low electronegativity.

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The element that would have the lowest electronegativity is an element with a small number of valence electrons and a large atomic radius.

Both electronegativity and atomic radius are periodic trends. Electronegativity increases across the period while atomic radius decreases across a period.

An element that has a small number of valence electrons and a large atomic radius will most likely be a metal hence it will have the lowest electronegativity.

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Answer:

I think it is A

Explanation:

A.They study how to make plants produce certain chemicals

The process that can be responsible for the movement of glucose from the inside of the artificial cell to the solution outside would be diffusion.

Diffusion is a cellular transport whereby molecules of solutes of gases move from the region of higher to the region of lower concentration.

Diffusion is different from osmosis. The latter is a form of cellular transport whereby water molecules move from the region of higher water potential or lower concentration of solutes to the region of lower water potential or higher concentration of solute with the involvement of a selectively permeable membrane.

The inside of the artificial cell in the image contains 10% glucose while the outside solution is made of distilled water. Thus, glucose molecules can diffuse from the inside of the cell to the outside.

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I also din't know about these..

Answer:

The pH scale measures acidity of a substance. known as potential of hydrogen, it varies from 0 to 14 with 7 being the pH value of a neutral solution. Below 7 shows the substance is acidic in nature and above 7 is alkaline in nature. pH 0-3 are considered strong acids while pH 4-6 are weak acids. pH 8-10 are weak alkalines and pH 11-14 are strong alkalines. This is a general trend and there may be exeptions especially if the substance has a negative pH. However, it would not be covered likely unless you are doing university chemistry.

Answer:

Yes, there are some free resource like quiz..let quizzes to help guide you through your studying, so if you want just post the questions and I can answer them as well.

Hence the reaction is first order. and k = 0.00582 s-1 is the rate constant  and half life t1/2 = 1.98 min = 2 min (approx.)

(a) Initial amount = 1.000 M

Time for the conversion of half of the amount into product = 2 min   where [N2O5]=0.497 (approx.0.50)

After, next 2 min the amount again halved i.e. 0.246 M (approx.0.25M).

Hence the reaction is first order. where the original amount has no bearing on the half-life.

(b) First order integrated rate constant equation is,

k = (1/t)*ln[A]0/[A]t

k = (1/1) * ln(1.000 / 0.705)

k = 0.350 min-1

k = 0.350 / 60 s-1

k = 0.00582 s-1

(c) t1/2 = 0.693 / k

t1/2 = 0.693 / 0.350

t1/2 = 1.98 min = 2 min (approx.)

A chemical breaking down into two or more simpler compounds is known as a decomposition process.

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A stiff metal bottle containing helium floats at the surface of the pond. If additional helium is added to that bottle, leaving its temperature and volume unchanged, the bottle will float because of the Archimedes principle.
This principle states that the buoyant force on a body is equal to the weight of the fluid displaced by the body. When a body is placed in a fluid, it experiences an upward force known as the buoyant force. If the buoyant force is greater than the weight of the body, the body will float.
In this case, the bottle containing helium floats on the surface of the pond because helium is less dense than air. Adding additional helium to the bottle will increase the volume of helium inside the bottle, but the temperature and volume of the bottle will remain the same. As a result, the buoyant force acting on the bottle will increase, making it float more easily on the surface of the pond.
However, it should be noted that the buoyant force acting on the bottle is also affected by the density of the fluid. If the density of the pond water increases, the buoyant force acting on the bottle will decrease, making it more difficult for the bottle to float. Therefore, the buoyancy of the bottle is determined by both the density of the fluid and the amount of helium in the bottle.

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Answer:

1: A salt plus hydrogen gas

2: Yes, the metals which react with cold water are; sodium, calcium and potassium. Magnesium does not react with cold water. Metals like aluminum, iron and zinc do not react either with cold or hot water. Metals such as lead, copper, silver and gold do not react with water at all.

3: There is no reaction between dilute hydrochloric acid or sulfuric acid and the metals below hydrogen in the reactivity series.

4: Yes. The product that forms is called rust.

To determine the percent by mass of a compound, you will need to use the formula:% by mass = (mass of element / molar mass of compound) x 100Given that the compound contains 6.0 g of carbon and 1.0 g of hydrogen and has a molar mass of 42.0 g/mol.

We can find the percent by mass of carbon and hydrogen as follows: Mass of Carbon = 6.0 g Mass of Hydrogen = 1.0 g molar mass of the compound = 42.0 g/mol

Using the formula,% by mass of Carbon = (mass of element / molar mass of compound) x 100= (6.0 g / 42.0 g/mol) x 100= 14.28% % by mass of Hydrogen = (mass of element / molar mass of compound) x 100= (1.0 g / 42.0 g/mol) x 100= 2.38%

Therefore, the percent by mass of carbon and hydrogen in the given compound are 14.28% and 2.38% respectively.

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The element is Neon
The protons is the same as the atomic number (10 protons)
The electrons are the same as the number of protons in a neutral atom (10 electrons)
The neutrons can be found by subtracting the protons from the atomic mass (22-10=12 neutrons)

Answer:

I think it's C. Animals add water vapor to the air through respiration

Explanation:

It is likely that the rest of the rock was broken down into even smaller particles, such as sand or dust.

This process of breaking down rocks into smaller particles is called weathering and can occur due to various factors, such as water, wind, and temperature changes. These small particles have less mass than the original rock and the pebbles, but they still contribute to the overall mass of the material.  Over time, the small particles can be transported by water or wind and deposited in different locations, contributing to the formation of new landforms.

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Given the equation :

CH3OH +Cl2 →← 2 CH3CL + 2OH ^-1

at equilibrium concentration, we have:

(1.5 -2x )/ 5L + (1.0 -x )/5L =2x /5L + 2x /5L

→ (1.5-2x+ 1 -x )/ 5L = 4x /5L

→(0.5 -3x)/5L = 4x/5L (5L in the Left hand side cancels 5L inthe right hand side)

→ 0.5 = 4x +3x

0.5 = 7x

x = 0.5/7

x = 0.071

( Extra note : Now lets test and see if this balances ):

LHS : (1.5 -2x )/ 5L + (1.0 -x )/5L = 0.5 -3x)/5L

= 0.5 - 3(0.071)/5

= 0.287 /5 = 0.05

RHS :4(x) /5 = 4(0.071) /5

= 0.28/5 = 0.05

at equlibrium , LHS = RHS therefore our x value is 0.07

The reaction has not yet started, and the time required for 16.8% of the reactant to remain cannot be calculated using the given rate constant.

Given,The rate constant for this first-order reaction is 0.0830 s−1 at 400 ∘C.A⟶products After how many seconds will 16.8% of the reactant remain-The time taken for a first-order reaction to reach a particular percentage of completion can be calculated using the following formula:t = (ln(A/A₀))/kwhere A₀ is the initial concentration of the reactant, A is the concentration of the reactant at a given time, k is the rate constant, and t is the time elapsed since the reaction began.In this question, we are given the rate constant, k = 0.0830 s−1 at 400 ∘C, and we want to find out the time required for 16.8% of the reactant to remain.Let's assume that the initial concentration of the reactant is 100 units (we can assume any value as it does not affect the percentage of completion).Therefore, the concentration of the reactant remaining after 16.8% of completion would be: A = 16.8 units.Substituting these values in the above formula, we get:t = (ln(16.8/100))/0.0830t = (−1.7918)/0.0830t = −21.58 sThis time value is negative, which means that the reaction has not even started yet. Therefore, we need to check the given percentage of completion.

If it is less than 50%, we can assume that the reaction has not yet started. In this case, the percentage of completion is 16.8%, which is less than 50%.

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The secondary coolant is converted to steam, which runs the steam turbine to generate electricity.

Secondary coolant:

The reactor coolant flows from the reactor to the steam generator. Inside of the steam generator, the hot reactor coolant flows inside of the many tubes. The secondary coolant, or feedwater, flows around the outside of the tubes, where it picks up heat from the primary coolant.

The secondary system is designed to transport heat from primary system to the atmosphere via an evaporative cooling tower. The typical system is designed to furnish 12.6 m3/min of water to the plate type heat exchanger at an inlet temperature of about 33 °C and an outlet temperature of about 42 °C.

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Answer:

Nervous system directs your body to swear to release heat.

Explanation:

Sweat maintains homeostasis when overheating.

When the body becomes overheated, the nervous system directs your body to sweat to release heat. Cooling effect of sweating over body balance the homeostasis.

Any self-regulating mechanism called homeostasis helps biological systems to maintain stability while responding to environmental factors that are appropriate for survival. If homeostasis is attained, life goes on; if it is not, tragedy or death result.

The stability obtained is actually a dynamic equilibrium, where circumstances are mostly uniform yet change is constant. The ability to regulate their body temperature is a prime example of homeostasis in a biological system.

Humans typically have body temperatures that vary about 37 °C, but a number of variables, such as exposure, hormones, metabolic rate, and sickness, can alter this value and cause abnormally high or low temperatures. The sweating is a good example of homeostasis.

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