Atoms of most nonmetallic elements achieve noble-gas electron configurations by gaining electrons to become __ or a negatively charged ions

Answer: The thermal energy that would be released by 276.0g of sodium acetate trihydrate is 71.8kJ.

Explanation:

Supercooling is the process of lowering the temperature a liquid below its freezing point, without it becoming solid. A liquid below its freezing point will crystallize in the presence of a seed crystal because it serves as a structure for formation of crystals. From the question,

The given mass of sodium acetate trihydrate

(CH3COONa.3H2O)= 276.0g

Molar mass of sodium acetate

trihydrate= 136.08g/mol

Thermal heat of fusion of sodium acetate

trihydrate = 35.9 kJ/mol

From the given mass the number of moles present= 276.0/ 136.08

= 2.0moles

Therefore the heat (thermal) energy of the given mass of sodium acetate

trihydrate = 2.0 × 35.9

= 71.8kJ

Therefore, upon addition of a small seed crystal, the solution temperature increases as sodium acetate trihydrate crystallizes.

Explanation:

Molar mass of AlCl3 = 133.34g/mol

Moles of AlCl3 used

= 20.0g / (133.34g/mol) = 0.150mol

Mole Ratio of AlCl3 to Cl2 = 2 : 3,

Moles of Cl2 produced

= 0.150mol * (3/2) = 0.225mol

We know that 1 mole of any gas has

6.023 * 10²³ molecules.

Hence, number of molecules in Cl2

= 0.225mol * (6.023 * 10²³/mol)

= 1.35 * 10²³ molecules. (C)

The awnser is D. polarity

A microscopic property that helps determine whether or not two substances will dissolve with each other is: D. polarity.

Solubility can be defined as a measure of how readily a substance dissolves in a solvent to form a solution. Therefore, a substance is generally considered to be soluble if it is able it dissolve completely in a solvent and it is said to be insoluble if it does not dissolve in a solvent or only dissolves partially.

On a related note, polarity refers to a microscopic property that is typically used to determine whether or not two (2) substances will dissolve with each other.

Basically, the polarity of a substance connotes the distribution of electrical charge (electrons) around its atom by virtue of a chemical bond. Thus, the polarity of a substance is grouped into two (2) main categories and these are:

In conclusion, this microscopic property referred to as polarity helps to determine whether or not two substances will dissolve with each other.

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Answer:

m = 483.32 pounds

Explanation:

Given that,

The density of the object is 1.65 g/mL

Volume of the water is 35.1 gallons

We know that,

1 gallon = 3785.41 mL

35.1 gallons = 132868 mL

The density of an object is equal to its mass divided by its volume. So,

\(d=\dfrac{m}{V}\\\\m=d\times V\\\\m=1.65\ g/mL\times 132868\ mL\\\\m=219232.2\ \text{grams}\)

Also, 1 pound = 453.592 grams

So, 219232.2 grams = 483.32 pounds

So, the weight of the object is 483.32 pounds.

m = 483.32 pounds

The density of an object is equal to its mass divided by its volume.

Given that,

The density of the object is 1.65 g/mL

Volume of the water is 35.1 gallons

We know that,

Also, 1 pound = 453.592 grams

So, 219232.2 grams = 483.32 pounds

So, the weight of the object is 483.32 pounds.

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C-C triple bond have different environment. Hence, it will show IR active stretching frequency.

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The IR active stretching would be observed for the bonds that are not symmetrical.

We know that compounds that are polar implies that the molecules do have a dipole moment in the molecule. This means that the bond is not symmetrical owing to the fact that the groups that are attached to the central atom of the bond are not the same.

The IR active compounds are the compounds that are have bonds that are not symmetrical. All we need is to look at the bonds and find out the ones that are not symmetrical and hence would have a net dipole moment.

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True. The principle of "safer solvents and auxiliaries" is one of the 12 principles of green chemistry.

This principle aims to reduce or eliminate the use of auxiliary substances, such as solvents and separation agents, in chemical processes whenever possible. The use of these substances can have negative environmental and health impacts, such as toxicity, flammability, and the production of waste.

Therefore, chemists should aim to find alternative, safer methods and materials that can replace or reduce the need for these substances. This can include using water as a solvent, which is a safer and more environmentally friendly option compared to organic solvents, or using catalysts to minimize the need for separation agents. By implementing this principle, chemists can help minimize the environmental impact of chemical processes and promote more sustainable practices.

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Answer:

A.) If the temperature increases, then crickets will chirp more.

Explanation:

The hypothesis is a testable statement that can be supported or disproved through experimentation.

A.) is correct. This statement clearly identifies what will (supposedly) happen when a variable is manipulated. Once an experiment is carried out, this hypothesis can be supported or negated.

B.) is incorrect. This is an opinion, not an objective statement. This statement is subjective and cannot be backed by evidence.

C.) is incorrect. Hypotheses are not questions. This statement also does not state how temperature could affect a cricket's chirp. However, questions can often lead to the formation of a hypothesis.

D.) is incorrect. The first part of the statement is an observation, and the second part is an assumption. Like in answer C, this information can be used as the basis in making a hypothesis.

Answer:

Nitrogen is the chemical element with the symbol N and atomic number 7.

Explanation:

Answer:

´protons: 16

neutrons: 16

name: sulfur

Explanation:

Answer:

0 °C

Explanation:

Answer:

0 C

Explanation:

(a) tetrahedral (b) tetrahedral (c) bent or V-shaped (d) trigonal planar (e) bent or V-shaped (f) bent or V-shaped (g) linear (h) tetrahedral (i) trigonal planar

(a) The molecular structure is tetrahedral around the sulfur atom, with the four oxygen atoms forming the vertices of the tetrahedron.

(b) The molecular structure is tetrahedral around the chlorine atom, with the three oxygen atoms and hydrogen atom.

(c) The molecular structure is bent or V-shaped around the oxygen atom, with the two hydrogen atoms at the bottom of the V.

(d) The molecular structure is trigonal planar around the nitrogen atom, with the three oxygen atoms and hydrogen atom.

(e) The molecular structure is bent or V-shaped around the oxygen atom, with the hydrogen atom and nitrogen atom.

(f) The molecular structure is bent or V-shaped around the central oxygen atom, with the two other oxygen atoms at the bottom of the V.

(g) The molecular structure around each carbon atom is linear, with the two other carbon atoms forming a straight line with the carbon atom at the center.

(h) The molecular structure around the carbon atom is tetrahedral, with the two other carbon atoms and two fluorine atoms forming the vertices of the tetrahedron.

(i) The molecular structure around each carbon atom is trigonal planar, with the two other carbon atoms forming a straight line.

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--The complete question is, Describe the molecular structure around the indicated atom or atoms:

(a) the sulfur atom in sulfuric acid,

(b) the chlorine atom in chloric acid,

(c) the oxygen atom in hydrogen peroxide, HOOH

(d) the nitrogen atom in nitric acid,

(e) the oxygen atom in the OH group in nitric acid,

(f) the central oxygen atom in the ozone molecule,

(g) each of the carbon atoms in propyne,

(h) the carbon atom in Freon,

(i) each of the carbon atoms in allene--

The proper name of the compound is now 1,1 - dihydroxy-3-phenyl propene.

Firstly we know that the parent chain is based on propane. Now we have three substituents on that parent chain. Two hydroxy moieties and one phenyl moiety.

The proper name of the compound is now 1,1 - dihydroxy-3-phenyl propene.

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Answer:

lack of snow in the mountains makes drought cycles worse because mountains are a natural part of the water cycle.

Explanation:

Mountains play a critical part In the water cycle by capturing moisture in the air and it precipitates as snow and when it does this the snow will melt in the warmer seasons and flow down stream then following the rest of the water cycle if we didn't have this then the streams would run less and it would greatly disrupt the water cycle.

Answer:

Explanation:

If a zero is found between significant digits, it is significant

The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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Answer:

Here is the correct order (ascending order):

gene, DNA, chromosome, nucleus, cell, organism.

A gene is a segment of DNA that contains the instructions for building a protein or RNA molecule. DNA is the molecule that carries genetic information and makes up genes. A chromosome is a structure made of DNA and protein that carries genes. A nucleus is a membrane-bound organelle that contains chromosomes. A cell is the smallest structural and functional unit of living organisms, consisting of a nucleus (or nucleoid in prokaryotes) and cytoplasm. An organism is an individual living entity, such as a plant, animal, or bacterium, that consists of multiple cells.

Answer:

Option C. Metal C.

Explanation:

To know which option is correct, we'll begin by calculating the density of each metal.

The density of a substance is simply defined as the mass of the substance per unit volume of substance. It can be expressed mathematically as:

Density = mass /volume.

Now, we shall determine the density of each metal as follow:

Metal A:

Volume = 12.5 cm³

Mass = 122 g

Density =?

Density = mass /volume

Density = 122/12.5

Density = 9.76 g/cm³

Metal B:

Volume = 14.2 cm³

Mass = 132 g

Density =?

Density = mass /volume

Density = 132/14.2

Density = 9.30 g/cm³

Metal C:

Volume = 18.1 cm³

Mass = 129 g

Density =?

Density = mass /volume

Density = 129/18.1

Density = 7.13 g/cm³

Metal D:

Volume = 12.7 cm³

Mass = 126 g

Density =?

Density = mass /volume

Density = 126/12.7

Density = 9.92 g/cm³

Summary:

Metal >>>>>>>> Density

A >>>>>>>>>>>> 9.76 g/cm³

B >>>>>>>>>>>> 9.30 g/cm³

C >>>>>>>>>>>> 7.13 g/cm³

D >>>>>>>>>>>> 9.92 g/cm³

From the above calculations, metal C has the lowest density.

Answer:

In Thomas Cole's painting "The Oxbow," Thomas Cole, the artist, shows himself sitting in the landscape while painting it.

Explanation:

In the painting called "The Oxbow" by Thomas Cole, the artist actually put himself in the picture. He's sitting right in the middle of the landscape, just like he placed himself in the painting, as if taking a selfie while working on it. It's like he took a snapshot of himself while he was working on the painting. This shows how much he cared about creating the artwork and how he felt a personal connection to the beautiful scenery. It's really fascinating because it gives us a glimpse into how he saw himself as an artist and how he wanted to capture the incredible beauty of nature through his art.

Answer:

Average speed of helium is higher than argon.

Explanation:

The average speed of helium is higher than argon atom under the conditions specified because of lower mass of the helium atom as compared to argon atom. Average speed of an atom is inversely proportional to mass of the atom. If mass of an atom decreases, the atom moves with higher speed while on the other hand, if the mass of an atom increases the average speed of an atom decreases.

Answer:

Itz 4 and watch the superbowl please.

Explanation:

The formula you provided calculates the percent change in pH based on the difference between the pH at 5 drops and the pH at 0 drops. Here's how you can use the formula:

1. Determine the pH at 5 drops and the pH at 0 drops.

Let's say the pH at 5 drops is 4 and the pH at 0 drops is 7.

2. Plug the values into the formula:

Percent Change of pH = 100% × (pH at 5 drops - pH at 0 drops) / pH at 0 drops

Percent Change of pH = 100% × (4 - 7) / 7

3. Calculate the numerator:

4 - 7 = -3

4. Calculate the denominator:

Percent Change of pH = 100% × (-3) / 7

5. Calculate the percent change:

Percent Change of pH = -300% / 7

Therefore, the percent change in pH from 0 drops to 5 drops is approximately -42.86%.

Answer:

answer number C is the correct answer for this

Answer:

2024.70 J

Explanation:

The heat capacity of the coffee cup calorimeter can be calculated using the following formula:

q_calorimeter = q_water + q_water_final

where q_calorimeter is the heat absorbed by the coffee cup calorimeter, q_water is the heat lost by the warm water, and q_water_final is the heat gained by the cold water.

First, calculate q_water:

q_water = m_water * c_water * ΔT

where m_water = 25.0 g is the mass of the warm water, c_water = 4.184 J/g°C is the specific heat of water, and ΔT = (40.0°C - 29.5°C) = 10.5°C is the change in temperature.

q_water = 25.0 g * 4.184 J/g°C * 10.5°C = 1057.35 J

Next, calculate q_water_final:

q_water_final = m_water * c_water * ΔT

where m_water = 25.0 g is the mass of the cold water, c_water = 4.184 J/g°C is the specific heat of water, and ΔT = (29.5°C - 20.0°C) = 9.5°C is the change in temperature.

q_water_final = 25.0 g * 4.184 J/g°C * 9.5°C = 967.35 J

Finally, calculate the heat capacity of the coffee cup calorimeter:

q_calorimeter = q_water + q_water_final = 1057.35 J + 967.35 J = 2024.70 J

So the heat capacity of the coffee cup calorimeter is 2024.70 J.

A 25.0 g sample of warm water at 40.0⁰C was added to a 25.0 g sample of water in a Styrofoam coffee cup calorimeter initially at 20.0⁰C. 2024.70 J is the heat capacity of the coffee cup calorimeter.

A physical feature of matter known as heat capacity and thermal capacity is the quantity of heat that must be applied to an object in order to cause a unit change in temperature. Heat capacity is measured in joules per kelvin (J/K), the SI unit. A broad property is heat capacity.

The particular heat capacity, which can be calculated by dividing an object's heat capacity by its mass, is the comparable intense attribute. The molar heat capacity is obtained through dividing the specific heat even by molecular weight of the substance. The heat capacity per volume is gauged by the volumetric heat capacity. The term "thermal mass" is frequently used in civil engineering and architecture to describe a building's ability to hold heat.

q calorimeter = q water + q water final

q water = m ×c water ×ΔT

q water = 25.0 g×4.184 J/g°C ×10.5°C

              = 1057.35 J

q water final = m×c of water × ΔT

q water final = 25.0 g×4.184 J/g°C ×9.5°C

                   = 967.35 J

q calorimeter = q water + q water final

                      = 1057.35 J + 967.35 J

                      = 2024.70 J

Therefore,  2024.70 J is the heat capacity of the coffee cup calorimeter.

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question we have

\(density = \frac{3.85}{3.0} \\ = 1.28333...\)

We have the final answer as

Hope this helps you

This element is found in group 3A, period 3

The maximum number of electrons that can be filled in the nth electron shell is 2n²(n=shell)

Electron configuration of element X : 2.8.3 , so :

K shell = 2 ⇒1s²

L shell = 8⇒2s²2p⁶

M shell = 3⇒ 3s²3p¹

Block p: group 13-18 (has a 2p-6p configuration), also called a representative element because it includes metals, non-metals and metalloids

The outer shell 3s²3p¹ : located in group 3A and period 3

group⇒valence electron ⇒3

period⇒the greatest value of the quantum number n⇒3

Answer:

b

Explanation:

Answer:

b

Explanation:

Answer:

A. Oxygen pushes electrons towards the hydrogens.

Explanation:

The oxygen is reduced because it undergoes a partial gain of electrons. The oxygen atom in water has greater electron density near it than they did in the O₂ molecule.

Reduction is a chemical reactions in which the number of electrons associated with an atom or a group of atoms is increased.

The electrons taken up by the substance reduced are supplied by another substance, which is thereby oxidized.

The hydrogen is oxidized because it added oxygen to form water.

Conversely the oxygen is reduced because it added hydrogen to form water.

Therefore, The oxygen is reduced because it undergoes a partial gain of electrons. The oxygen atom in water has greater electron density near it than they did in the O₂ molecule.

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This problem is providing us with the balanced chemical equation whereby cupper (II) nitrate is produced from copper and nitric acid. Thus, the produced grams of water are required and found to be 92.8 g as shown below:

In chemistry, stoichiometry is a tool for us to perform mole-mass relationships given a balanced chemical equation. In such a way, since this problem points out the moles of nitric acid that are consumed, one can write the following stoichiometric setup:

\(10.3molHNO_3*\frac{4molH_2O}{8molHNO_3} *\frac{18.02gH_2O}{1molH_2O}\)

Where 4:8 is the mole ratio of water to nitric acid and 18.02 the molar mass of water. Hence, the result turns out to be:

\(92.8gH_2O\)

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The percent transmittance (%T) and absorbance (A) of a solution are related by an equation which can be used to solve this question.

The percent transmittance (%T) and absorbance (A) of a mixture are associated by the following equation:

%T = 100 x 10^(-A)

We are given that the %T value of the solution is 51.6% at a wavelength of 550 nm. To find the absorbance (A), we can rearrange the equation above:

A = -㏒(%T / 100)

On substituting the value in the given %T value, we get:

A = -㏒(51.6 / 100) = -㏒(0.516) = 0.286

Therefore, the absorbance of the solution at a wavelength of 550 nm is 0.286.

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