Determine the electron-group arrangement, molecular shape, and ideal bond angle(s) for each of the following:
(c) CF₄

Answer:

metals can react with acid, water and oxygen

After 4 minutes, 400 g of the sample would have decayed to 400 g -  (200 g x 4) = 396.2 g.

Protactinium (symbol Pa) is a rare, radioactive, metallic element in the actinide series of the periodic table. It has an atomic number of 91 and an atomic mass of 231. It is found in trace amounts in nature, but can be artificially produced in a nuclear reactor. Protactinium is a soft, silvery-gray metal that is soluble in acids and insoluble in bases. It has a high melting point and is moderately toxic. It has a variety of uses, including as a fuel source in nuclear reactors and in medical research.

After 4 minutes, 400 g of protactinium-234 would have decayed to approximately 396.2 g.
This is because the half-life of protactinium-234 is 1 minute, meaning that in one minute, half of the original amount (200 g) of the sample will decay.

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Answer:

Water can be used as the thermometric liquid. It expands and contracts with temperature so it can be used. It's just not a very good choice because: It's thermal expansion is not very large compared to other liquids like mercury.

Explanation:

Hope this help

True, MDMA (ecstasy) is a close chemical relative of methamphetamine.

Both drugs belong to the amphetamine family, which means they share some similarities in their chemical structure. However, MDMA and methamphetamine have different effects on the body and brain. Methamphetamine is a highly addictive stimulant that increases the levels of dopamine in the brain, leading to feelings of euphoria and intense pleasure. MDMA, on the other hand, is a synthetic drug that has both stimulant and hallucinogenic properties. It enhances the release of serotonin and oxytocin, which results in feelings of empathy, love, and bonding with others. Although both drugs can be harmful and have potential side effects, MDMA is less addictive than methamphetamine and is currently being studied for its therapeutic benefits in treating PTSD and anxiety disorders.

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Answer:

b...............................

Answer:

b

Explanation:

can you solve this for me?

the answer is D. The rain cycle says that Evaporation turns water into gas

Answer:

its matter

Explanation:

i just did the test

Answer:

They move freely between the clouds of several atoms, si the correcto Answer is D

Explanation:

Hope this helps.

Answer:

2.8 moles

Explanation:

The number of water needed to react with 8.4 moles of NO₂ is equal to 4.2 moles.

A mole can be defined as a scientific unit that is used to determine a large number of atoms, molecules, and ions. The mass of 1 mole of any chemical element is atomic mass and that of any chemical compound is molar mass.

The number of particles in one mole is equal to 6.023 × 10 ²³ which is known as Avogadro’s constant.

The balanced chemical equation of water and nitrogen dioxide NO₂ is:

\(H_2O + 2NO_2\longrightarrow HNO_3 +HNO_2\)

From the equation, we can say that two moles of nitrogen dioxide (NO₂) react with one mole of water.

8.4 moles of nitrogen dioxide react with water = 8/4/2 = 4.2 mol

Therefore, 4.2 moles of water are needed to react with 8.4 moles of nitrogen dioxide NO₂.

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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:

a

Explanation:

Answer:

B: Ions.

Explanation:

It breaks into two particles when placed into water: A positive ion and a negative ion.

Answer:

11) E

12) C

13) M

14) C

15) M

16) M

17) C

18) E

19) C

20) M

Explanation:

An element is a pure substance such as gold and silver. You can find those elements in the periodic table. A compound is a substance consisted of molecules from two or more different elements. Water is made up of hydrogen and oxygen (H2O). Sugar is a very wide category of compounds. Carbon dioxide is made up of carbon and oxygen (CO2). Ice is frozen water/water in the solid state (H2O). A mixture is a group of substances held together physically. Seawater is a mixture of water and salt. A chocolate sundae is a mixture of chocolate sauce and ice cream. Air is a mixture of many gases including oxygen and nitrogen. A big mac is a mixture of burger meat, lettuce, tomatoes, etc.

Answer:

displacement reaction

Answer: 10 moles

Explanation:

Answer:

A. 7

(assuming the water is neutral)

Answer:

I'm thinking cooper but not sure

Answer:

Explanation:

GIven that:

The activation energy = 250 kJ

k₁ = 0.380 /M

k₂ = ???

Initial temperature \(T_1 =\) 1001 K

Final temperature \(T_2 =\) 298 K

Applying the equation of Arrhenius theory.

\(In \dfrac{k_2}{k_1 }= \dfrac{Ea}{R}( \dfrac{1}{T_1 }- \dfrac{1}{T_2})\)

where ;

R gas constant = 8.314  J/K/mol

\(In \dfrac{k_2}{0.380 }= \dfrac{250 * 10^3}{8,314}( \dfrac{1}{1001 }- \dfrac{1}{298})\)

\(In \dfrac{k_2}{0.380 }= -70.8655\)

\(\dfrac{k_2}{0.380 }= e^{-70.8655}\)

\(\dfrac{k_2}{0.380 }= 1.67303256 \times 10^{-31}\)

\({k_2}= 1.67303256 \times 10^{-31} \times {0.380 }\)

\({k_2}= 6.3575 \times 10^{-32}\)  /M .sec

Half life:

At 1001 K.

\(t_{1/2} = \dfrac{In_2}{k_1}\)

\(t_{1/2} = \dfrac{0.693}{0.38}\)

\(t_{1/2} =\) 1.82368 secc

At 298 K:

\(t_{1/2} = \dfrac{0.693}{6.3575 \times 10^{-32}}\)

\(t_{1/2} =1.09 \times 10^{31} \ sec\)

The gas occupies 53.3 L of space after the temperature has increased to 75°C.

What is Temperature?

Temperature is a measure of the average kinetic energy of the particles in a substance or system. In other words, it is a measure of how fast the particles are moving on average. Temperature is commonly measured in degrees Celsius (°C) or Fahrenheit (°F), although in science and engineering, the Kelvin (K) scale is often used.

To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas:

(P1 × V1) / T1 = (P2 × V2) / T2

where P1 and T1 are the initial pressure and temperature, V1 is the initial volume, and P2 and T2 are the final pressure and temperature, and V2 is the final volume.

We are given that the initial volume V1 is 46 L, the initial temperature T1 is 26°C, and the final temperature T2 is 75°C. We need to find the final volume V2.

First, we need to convert the temperatures to the absolute scale (Kelvin) by adding 273.15 to each temperature:

T1 = 26°C + 273.15 = 299.15 K

T2 = 75°C + 273.15 = 348.15 K

Now we can use the combined gas law:

(P1 × V1) / T1 = (P2 × V2) / T2

We can assume that the pressure is constant since it is not given in the problem. Therefore, we can simplify the equation to:

V2 = (V1 × T2) / T1

V2 = (46 L × 348.15 K) / 299.15 K

V2 = 53.3 L (rounded to one decimal place)

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If an excess of a compound that reacts with primary amines were introduced to a cell, it could potentially lead to a decrease in the activity of newly synthesized pyruvate carboxylase.

Pyruvate carboxylase is an enzyme that plays a key role in the metabolism of carbohydrates and fats. It catalyzes the conversion of pyruvate, a three-carbon molecule produced during glycolysis, into oxaloacetate, a four-carbon molecule. This reaction requires the presence of ATP and bicarbonate, and it occurs in the mitochondria of cells.

Primary amine is an organic compound that contains a nitrogen atom attached to two hydrogen atoms and one alkyl or aryl group.

According to the given information:

If an excess of a compound that reacts with primary amines were introduced to a cell, it could potentially lead to a decrease in the activity of newly synthesized pyruvate carboxylase. Pyruvate carboxylase contains lysine residues that are critical for its activity, and excess amounts of a compound that reacts with primary amines could potentially modify or inhibit these lysine residues, thereby reducing the activity of the enzyme. Additionally, excess amounts of the compound could lead to the accumulation of toxic byproducts, which could further disrupt cellular processes and lead to a decrease in pyruvate carboxylase activity. Overall, the exact effect of the compound on pyruvate carboxylase activity would depend on the specific nature and concentration of the compound, as well as the overall metabolic state of the cell and the availability of other cellular components necessary for pyruvate carboxylase function.

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Water is the solvent in the saline solution. Hence, option D is correct.

A solute is something being dissolved, a solvent is a thing dissolving the item, and the solution is the mixture of the two items.

In a hospital, bags of saline solution are used to rehydrate patients. They are made by dissolving a specific amount of salt in water. Water is the solvent in the saline solution.

Hence, option D is correct.

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When an H atom absorbs an ultraviolet photon with the correct energy, the electron in the atom can undergo a transition from the fifth energy level (n=5) to the first energy level (n=1).

This type of transition is called a "quantum jump" and is associated with the emission of a photon. When an H atom absorbs an ultraviolet photon with the correct energy, it will move from its ground state to an excited state.

This excitation of the electron can then lead to further processes such as the emission of a photon or the formation of an ion-pair. Therefore the correct answer is D)n=5 to n=1 when the H atom absorbs an ultraviolet photon with the correct energy

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complete question:

when a H atom absorbs an ultraviolet photon with the correct energy, what transition can the electron in the atom undergo?

A)n=1 to n=5

B)n=2 to n=6

C)n=6 to n=2

D)n=5 to n=1

The empirical formula of this oxide of magnesium is derived as  MgO.

In chemistry, empirical formula of a chemical compound is simplest whole number ratio of atoms present in compound. An example of this concept is that: empirical formula of sulfur monoxide, or SO, would be SO as the empirical formula of disulfuric dioxide, S₂O₂.

Given total mass of magnesium ribbon, crucible and cover of  21.35 grams

Given that magnesium combined with oxygen gives a mass of 21.82 grams.

As we know, mass of magnesium oxide = mass of Mg + mass of O

mass of O = 21.82 - 21.35

= 0.19

moles of O = 0.19/16

= 0.011 mol O

So, now the empirical formula of magnesium oxide is MgO.

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Amount of CO will decrease and that of C and CO2 will increase and Hence equlibrium will shift in direction having lesser moles of gas.

Xe + 2F2 = XeF4

Moreover, Equlibrium constant changes with temperature only.

So, Heat + C + CO2 = 2CO. If the pressure on the system is increased volume will decrease.

Hence equlibrium will shift in direction having lesser moles of gas.

Therefore equilibrium will shift toward bakcward direction.

so, Amount of CO will decrease and that of C and CO2 will increase.

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The balanced chemical equation for the reaction between carbon (C) and oxygen (O2) to form carbon monoxide (CO) and carbon dioxide (CO2) is below and the moles of CO2 produced is 0.117.

C + O2 → CO + CO2

According to the equation, for every 1 mole of C, we need 1 mole of O2 to produce 1 mole of CO and 1 mole of CO2.

Given that we have 0.155 moles of C and 0.117 moles of O2, we can use the mole ratio from the balanced equation to determine how many moles of CO2 could be produced:

Moles of CO2 = Moles of C = 0.155 moles

Therefore, based on the moles of each reagent, we could produce a maximum of 0.155 moles of CO2.

To determine the limiting reagent, we need to calculate the amount of CO2 that would be produced if all of the limiting reagent were consumed. We can do this by comparing the amount of CO2 that would be produced by each reagent and identifying the one that produces the smaller amount:

Using C as the limiting reagent:

Moles of CO2 produced = Moles of C = 0.155 moles

Using O2 as the limiting reagent:

Moles of CO2 produced = Moles of O2 × (1 mole CO2 / 1 mole O2) = 0.117 moles × (1 mole CO2 / 1 mole O2) = 0.117 moles

Since the amount of CO2 produced by the reaction with C is greater than the amount produced by the reaction with O2, we can conclude that O2 is the limiting reagent for this problem. Therefore, only 0.117 moles of CO2 could be produced based on the available amount of O2, and any excess C would be left over after the reaction.

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Answer:

3

Explanation:

Answer:

How many grams of potassium chloride, KCl, must be dissolved in 500.0 mL of solution to produce a 1.5 M solution? Answer: g 4. What is the molarity of a solution in which 84.0 grams of sodium chloride, NaCl, is dissolved in 1.25 liters of solution? Answer: M 5.

Explanation:

0.60759572 gal  is the volume of acid in gallons  in a sample of hydraulic acid .

The gallon is a unit of measurement for volume and fluid capacity in both the US  units and the British imperial systems of measurement.

In SI base units, 1 Gal is equal to 0.01 m/s²

Since ,

1 L, l = 0.2641720524 gal

now, volume of acid in gallons is given by -

2.3 L, l = 2.3 × 0.2641720524 gal

=0.60759572 gal

Hence , 0.60759572 gal is the volume of acid in gallons  in a sample of hydraulic acid .

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If a sample of hydraulic acid has a volume of 2.3L. then its volume of acid would be 0.5059 gallons.

A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation. Any additional quantity of that type can be stated as a multiple of the measurement unit.

as given in the problem, A sample of hydraulic acid has a volume of 2.3L

4.54609 L = 1 gallon

1 L = 1/4.54609 gallons

2.3 L = 2.3 /4.54609 gallons

        =  0.5059 gallons  

Thus, the volume of acid in gallons would be 0.5059 gallons.  

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Answer:

i have no clue

Explanation: