FILL IN THE BLANK in carboxylic acid derivatives, the heteroatom z stabilizes the functional group by resonance. the more basic atom z is, the _______readily it donates its electron pair and the________stable the coz group will be.

The learning activities titled "Hypothesis," "Variables and Hypothesis," and "Constructing a Hypothesis" all share certain similarities and differences. A question that arises in response to an observation is similar to a scientific research question in that both require some level of investigation to achieve an answer. However, scientific research questions are typically more specific and refined, with a defined methodology for obtaining data and verifying results.

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Answer:

c) selenium

Explanation:

Selenium is present in group sixteen.

It has six valance electrons.

Its atomic number is 34.

Atomic mass of selenium is 78.96 amu.

Electronic configuration pf selenium:

Se₃₄ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁴

we can see there are six valance electrons are present in selenium (4s² 4p⁴).

Valance electrons are those electrons which are present in outer most  electronic shell.

Other options are incorrect because,

There are  4 valance electrons in carbon.

2 valance electrons of barium.

one valance electron of lithium.

Answer:

radiant energy, solar energy

During nuclear fusion, radiant energy and solar energy from the core of the Sun is released. Hope it helps!

Answer:

Magnesium sulfate + hydrogen

Explanation:

Answer:

ok

Explanation:

In anisotropic refinement, this motion is fitted as an ellipsoid, the center of which lies inside the circle of motion, while the atom is loated on its periphery. This effect makes the bond distance appear shorter.

(answer is from go0gle not gonna say its lie)

After 1.5 days, only 1.25 mg of technetium-99m will remain out of the original 80 mg that was prepared.

Technetium-99m (99mTc) is a radioactive isotope that is used in medical imaging.

It has a half-life of 6 hours, which means that after 6 hours, half of the original amount of technetium-99m will have decayed.

Therefore, after another 6 hours (12 hours total), half of the remaining technetium-99m will have decayed, leaving only 25% of the original amount.

After another 6 hours (18 hours total), half of the remaining technetium-99m will have decayed again, leaving only 12.5% of the original amount.

After 1.5 days, which is 36 hours total, we can use the formula for radioactive decay to calculate how much technetium-99m will remain: amount remaining = original amount x \((1/2)^{t/h}\) where t is the time elapsed and h is the half-life.

Plugging in the given values, we get: amount remaining = 80 mg x (1/2)^(36/6) amount remaining = 80 mg x \((1/2)^{6}\) amount remaining = 80 mg x 0.015625 amount remaining = 1.25 mg

Therefore, after 1.5 days, only 1.25 mg of technetium-99m will remain out of the original 80 mg that was prepared.

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The lethal dose and how ounces of soda in a can of soda is not given, however, the standard lethal dose and volume of soda are given as below:

Lethal dose: 10 gm of caffeine

The volume of soda per can =  12oz/can

Answer:

The correct answer is - 324.254 cans or round up to 325 cans. Ans.

Explanation:

Given:

2.57 mg caffeine / 1oz

12oz / 1can

Lethal dose: 10.0g or 10,000mg of caffeine

Solution:

Caffeine per soda can = (2.57 mg caffeine / 1oz) * (12oz / 1can) = 30.84 mg caffeine / 1can.

lethal dose would be in =

(10,000mg caffeine) * (1can / 30.84 mg caffeine) = 324.254 cans or round up to 325 cans. Ans.

(Can I have Brainlist)?

Answer:

2C4H10 + 13O2 —> 8CO2 + 10H2O. Oxidation reaction

8 (4 moles CO2 per mole butane)

Explanation:

could be written C4H10 + 6 1/2 O2 —> 4CO2 + 5H2O

According to the given statement 4.64 grams of O₂(g) are needed to completely burn 27.6 g C₃H₂(g).

Chemical equations are symbolic depictions of chemical reactions where the reactants and products are stated in terms of their respective chemical formulae.

Mass of C₃H₂ = 27.6 g

Molar mass of C₃H₂  = 38.05 g/mol

Molar mass of O₂= 32 g/mol

We have to calculate the moles of C₃H₂

moles of C₃H₂ = given mass C₃H₂/molar mass C₃H₂

moles of C₃H₂ = 27.6/38.05 = 0.725 mol

We have to calculate the moles of C₃H₂

The balanced chemical equation is:

C₂Hg (g) + 5O₂(g) → 3 CO₂(g) + 4H₂O(g)

From the reaction, we conclude that

As, 1 mole of C₂Hg react with 5 mole of O₂

So, 0.725 mole C₃H₂ of  react with 0.725/5 = 0.145 mole of O₂

We have to calculate the mass of O₂

Mass of O₂ = Moles of O₂ * Molar mass of O₂

Mass of O₂ = (0.145moles) * (32g/mol) = 4.64g

The mass of O₂ needed is, 4.64 grams.

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Answer:

Please be more specific

Answer:

The pH is 6.1.

Explanation:

1st) With the concentration of OH-, we have to calculate the pOH:

2nd) Using the relation between pH and pOH, we can calculate the pH:

So, the pH is 6.1.

Stock solutions contain a standardized concentration of the solute in a solution. To prepare 50 mL of solution with a ratio of 1:1000 solution, 5 gms of the drug will be required.

Dilution is the property of the solution with a less amount of solute concentration than the stock solution. A dilute solution is prepared by the addition of more solvent.

The addition of the solvent in a solution decreases the molar concentration which leads to dilution.

The ratio of 1:1000 means that 1 gm of the drug is present in 1000 mL (1L) of solution.

1000 mL = 1 gm × 500 mL × X gm

Here, the X represents the 0.5 gm of drug dissolved in 500 mL.

The amount of drug used is calculated as,

5 mL ÷ 50 ml = 0.5 g ÷ X g

X = 0.5 × 50 ÷ 5

= 5 gm

Therefore, 5 gm of the drug is required to prepare 50 mL of solution.

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Transformation in chemistry is scientifically used to explain the process of changing one compound to another in a chemical reaction.

The word "transformation" has a very special significance in chemistry. We know that in English, to transform would simply imply to change from one form to another. This is not quite far from its meaning in the parlance of chemistry.

The word transformation is normally applied in the area of chemical reactions especially as it has to do with reaction with in organic chemistry. It has to do with the change from one molecule to another and this is of great importance in the discussion of synthetic chemistry.

As such, the word transformation in chemistry is scientifically used to explain the process of changing one compound to another in a chemical reaction.

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1) reactants are the starting material of a chemical reaction and are written on the left hand side of the equation

while

products are the end result of the reaction and are written on the right hand side of the equation

a) The law of conservation of energy states that energy can not be created nor be destroyed

b) reactants are the substances that start a chemical reaction and are located on the left hand side of the arrow in a chemical equation, while products are the substances produced from the reaction and are located on the right hand side of the arrow.

c)if the number of atoms in the reactants do not equal the number of atoms in the products we say the reaction is unbalanced if they do equal each other, we say the reaction is balanced

d) chemical equation can be defined as the symbolic representation of chemical reactions in which the reactants and products are expressed in terms of their respective chemical formulae

2) combination reaction

decomposition reaction

single replacement reaction

double replacement reaction

combustion reaction

2 i synthesis is the production of chemical compounds by reaction from simpler materials

ii. Decomposition means to break up into constituent part by or as if by a chemical process

iii. single replacement is a reaction in which one element is substituted for another element in a compound

iv. Double replacement have two ionic compounds that are exchanging anions or cations

v. combustion means a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in form of flame.

This archipelago and its enormous marine reserve are referred to be a "living museum and showcase of evolution" for their singularity.

Thus, The 127 islands, islets, and rocks that make up the Galapagos archipelago, 19 of which are major and 4 of which are inhabited, are located roughly 1,000 kilometres from the Ecuadorian mainland. In 1959, national parks were established on 7,665,100 ha, or 97% of the entire emergent surface.

On the remaining three percent of the islands, only human habitation is permitted in designated rural and urban zones (the fifth island only includes an airport, a tourist dock, a fuel containment system, and military installations).

The Galapagos Marine Reserve, one of the largest marine reserves in the world, was established in 1986 and expanded to its current area in 1998. It surrounds the islands. Inland waters of the archipelago are also a part of the marine reserve.

Thus, This archipelago and its enormous marine reserve are referred to be a "living museum and showcase of evolution" for their singularity.

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The AX3 molecular structure (one central atom with three bonded atoms) can be non-polar even with bond dipoles present  If there were no lone pairs on the central atom. Option 1 is correct.

The molecular structure or shape is a 3-D pattern showing the arrangement of atoms of a molecule.

The molecular structure of AX3 is said to be composed of a central atom connected and bounded to three atoms which are equally spaced at an angle of 120° towards one another. It has a shape of trigonal planar and its sp² hybridized that does not have any lone pair.

The polarity of a molecule or a compound has to do with the presence of lone pair in the central atom. Since AX3 has no lone pair of electrons in its central atom it is said to be non-polar.

Example of compounds that exhibit AX3 with no lone pair is: BF₃ and CO₃²⁻

Therefore, we can conclude that we've understood what is molecular structure and how to identify the molecular structures that are polar and non-polar in nature.

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To prepare a 0.12 M solution of FeCl₃, the amount of solid FeCl₃ to be dissolved in a given volume of solvent will be 9.72 grams.

Given,

Molarity of FeCl₃ (M)= 0.12 M

The molecular weight (m) of FeCl₃ is  = 162 gm

The volume of the solution (V) to be prepared is =500 ml

The amount of FeCl₃ to be dissolved to make a 0.12 M solution is= x

So,

MV= x ÷ m × 1000

0.12× 500 = x ÷ 162 × 1000

x = 60 × 162 ÷ 1000

x= 9.72 gm

So 9.72 grams of FeCl₃ is dissolved to make 500 ml of 0.12 M solution.

For preparing 0.4 M HCl from 4M HCL:

If we need to make 500 ml of solution with 0.4M of HCL, then we use the formula:

M₁V₁= M₂V₂

0.4 × 500= 4 × x

x= 50 ml

So 50 ml of 4M HCL is taken to make 0.4 M HCL.

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Answer:

B.K2(OH)2 i think that is the answer

Answer:

Chlorine and Bromine are also halogens so they are similar to fluorine

Answer:

When isolated as a free element, chlorine takes the form of a greenish-yellow gas, which is 2.5 times heavier than air and smells like bleach. Chorine is the second-most-abundant halogen and the second-lightest halogen on Earth, after fluorine

Explanation:

Thermal Energy is directly proportional to the temperature

Or

\(\\ \sf\longmapsto Thermal\: Energy\propto Temperature \)

So if temperature increases the thermal Energy also increases.

An object which is 20°C warmer than other has more thermal energy

The sugars we have been discussing are made directly through a series of reactions in the Calvin Cycle, which uses CO2 as a starting input.

Recall that under thermodynamic laws, building complex molecules requires the input of energy in the form of sunlight. That energy in photosynthesis comes from the Light Reaction. Through a series of reactions in the Light Reaction, light energy is transformed into energy that is in the form of ATP and high-energy electrons carried by NADPH. In the Light Reaction, H2O is used and outputs as O2. In the Calvin Cycle, ATP and NADPH enter and output as ADP and NADP. These processes work together to produce glucose and other sugars that are essential for life. The sugars we have been discussing are made directly through a series of reactions in the Calvin Cycle, which uses CO2 as a starting input.

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350 Kcal is equals to 350000 calorie and 1464400 Joule.

The equation for calculating the energy content of a food source via calorimetry is as follows: Energy (joules) = Mass of water (g) × 4.2 (J/gºC) × Temperature increase (ºC)

1 Kcal = 1000 calorie

Therefore,

35 Kcal = 350 x 1000

            = 350000 calorie

Now,

1 calorie = 4.184 joule

Therefore,

35000 calorie = 350000 x 4.184

                        = 1464400 joule

Hence, 350 Kcal is equals to 350000 calorie and 1464400 Joule.

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The mass of the solid will be 114.7 g.

The density of a substance is given as the ratio of its mass and its volume.

Also, a solid will always displace its own volume in a liquid.

Mass of liquid solvent = 47.3 g

Density of liquid solvent = 0.865 g/mL

Recall that: density = mass/volume

Volume of liquid solvent = mass/density

                                     = 47.3/0.865

                                      = 54.7 mL

Volume of solid + liquid solvent = 90.0 mL

Volume of solid = 90.0 - volume of liquid solvent

                            = 90.0 - 54.7

                               = 35.3 mL

Density of solid = 3.25 g/mL

Mass of solid = density x volume

                       = 3.25 x 35.3

                          = 114.7 g

The mass of the solid is 114.7 g.

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