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Answer:

D. electron

Explanation:

Answer:

Knowing your lab equipment and their names will aid in having a successful experiment and may help in correcting errors.

If you do not know your lab equipment, that will only result in having a lack of knowledge of the equipment or not knowing how to correct a mistake in an experiment.

Explanation:

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Answer:

copper oxide + hydrochloric acid --> copper chloride + water

Explanation:

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Answer:

Copper oxide hydrochloric acid  ( CuCl2 + H2O)

Explanation:

CuO +  HCl  → CuCl2 + H2O

Answer:19

Explanation:

Explanation:

1) Carbon dioxide

2) methane

3) methanal

4) borane

5) Ozone

6) 1,1,1,1-tetrachloro methane

7) ammonia

8) water

Answer:

.

Explanation:

The south end of the Earth's axis is tilted toward the sun, summer in the Southern Hemisphere and winter in the Northern Hemisphere.  "Equal night", twice a year, when the noon sun is directly overhead the equator, day and night are almost exactly 12 hours each everywhere on earth! September 22 is autumn equinox.

Answer:

the northern hemisphere experiences fall

1) The endocrine glands pictured above are:

2) Organs of the endocrine system are often called glands. An organ is responsible for the production of one or more substances such as hormones, digestive juices, perspiration, tears, saliva, or milk.

The compounds are released directly into the circulation by the endocrine glands. The compounds are released by exocrine glands into a duct or aperture to the interior or outside of the body.

3) Pituitary Gland produces the following hormones:

The endocrine system regulates juvenile growth and development, adult body processes, and the reproductive process. All of the body's key activities and processes are controlled and regulated by the endocrine system: Energy management. Reproduction.

The pituitary gland, for example, is located at the base of the brain and is no larger than a pea. Despite its tiny size, the pituitary gland is sometimes referred to as the "master gland." Many other endocrine glands are controlled by the hormones it produces.

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The postulate oh John Dalton's atomic theory that was quickly proved wrong by JJ Thomson and Robert Mullikan was that atoms are indivisible.

Dalton was the first scientist to give a theory about atoms in which he gave several postulates like

1) Atoms of same particles are identical in shape, size and color.

2) Atom is the smallest unit of any matter.

3) Atoms can neither be created nor be destroyed.

4) Atoms of different elements combine with each other in fixed number or ratios to give new molecules.

Although Dalton's model initially got much appreciation but one postulate that is atoms is the smallest unit of any matter which means atoms are indivisible was proved wrong by JJ Thomson through his discovery of of electrons and by Robert Millikan through his discovery of the elementary charge of an electron.

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Answer:

2

Explanation:

The subscript on Ammoniumwhich is (NH4) is 2.

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Answer: o.125 moles of gas X with a molar mass of 240

Explanation:

2.8 dm3 of gas X at STP has equal mass with 11.2 dm3 of C2H6 at STP. What is the number of mole if gas X has 30 grams?

the molar volume of any gas at STP is the volume of 1 mole at STP

and is 22.4 L

the C2H6 has a volume of 11.2L at STP so it has 0.5 moles

C2H6 has a molar mass of (2 X 12) +(6 X 1) = 24 + 6 = 30

0,5 moles weighs 15 gm at STP with

so 15 gm at STP with 2.8 L for gas X

PV=nRT

P=1 atm

T =273.2k

V =2.8

R =0.082

n = PV/RT = (1 X 2.8)/(0.082 X 273.2) =0.125 moles of gasX

the weight of gas X is 30 gms

so 30/.125 =240 g/mole = molar mass of gas X

Nuclear magnetic resonance spectroscopy (NMR) is used to study the electronic environment of atoms and the bonding nature of a compound.

The number of different signals observed in the 1H NMR spectra of the given compounds are as follows: Compound A: 10 signals, Compound B: 6 signals ,Compound C: 4 signals Compound D: 6 signals ,Compound E: 9 signals, Compound F: 3 signals

In proton nuclear magnetic resonance spectroscopy (1H NMR), the magnetic field strength and electronic environment of the protons influence the chemical shifts. The shielding effect or deshielding effect of the nearby atoms, bond length, and bond angle, among other factors, all influence the chemical shifts. There are five different types of proton environments, which correspond to five different chemical shifts, in this case: Type 1: Hydrogen atoms that are covalently bonded to sp3 hybridized carbons. Type 2: Hydrogen atoms that are covalently bonded to sp2 hybridized carbons. Type 3: Hydrogen atoms that are covalently bonded to sp hybridized carbons. Type 4: Hydrogen atoms that are covalently bonded to aromatic carbons. Type 5: Hydrogen atoms that are directly bonded to electronegative elements such as nitrogen, oxygen, or halogens.

Here, to determine the number of signals expected in the 1H NMR of the compounds. Compound A: 10 different proton environments => 10 signals. Compound B: 6 different proton environments => 6 signals. Compound C: 4 different proton environments => 4 signals. Compound D: 6 different proton environments => 6 signals. Compound E: 9 different proton environments => 9 signals. Compound F: 3 different proton environments => 3 signals.

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Answers

A and D

Explanation

Biomass fuel is produced from organic materials, so trees and corn plants apply.

Each element is made up of only one kind of atom.

what is an element?

An element is a pure material composed of only one type of atom; it cannot be broken down further.

example- diamond and graphite are only made up of carbon atoms.

what is an atom?

An atom is a matter particle that specifies a chemical element uniquely. An atom is made up of a central nucleus and one or more negatively charged electrons. The nucleus is positively charged and contains one or more protons and neutrons, which are relatively heavy particles.

Each element is made up of only one kind of atom.

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The bond angle of a tetrahedral molecule is approximately 109.5 degrees. This is because a tetrahedron is a three-dimensional shape with four equivalent sp3 hybridized orbitals forming the corners of the tetrahedron.

The bond angle of a tetrahedral molecule is one of the most fundamental and important concepts in chemistry. A tetrahedron is a three-dimensional shape with four equivalent sp3 hybridized orbitals forming the corners of the tetrahedron. These hybridized orbitals result from the combination of the s and p orbitals of the central atom, creating four orbitals that are directed towards the four corners of the tetrahedron.

Each orbital can form a bond with an adjacent atom or molecule, resulting in four identical bonds in a tetrahedral molecule. The ideal bond angle between adjacent bonds in a tetrahedral molecule is 109.5 degrees, which is due to the geometric arrangement of the orbitals around the central atom. The four orbitals are arranged such that they are as far apart from each other as possible, resulting in an angle of 109.5 degrees between adjacent bonds.

Examples of tetrahedral molecules include methane (CH4), which has four identical C-H bonds arranged around the central carbon atom, and carbon tetrachloride (CCl4), which has four identical C-Cl bonds arranged around the central carbon atom. The understanding of tetrahedral bond angles is important in various fields of chemistry, including organic chemistry, biochemistry, and materials science, and it provides a basis for understanding the properties and behavior of many molecules.

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Answer:

The first one - Vacuoles

Explanation:

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ANSWER

the volume of the solution is 2.05 liters

EXPLANATION

Given that;

The concentration of Ca(OH)2 is 0.420M

The grams of Ca(OH)2 is 64.0 grams

Follow the steps below to find the volume of the solution

Step 1; Calculate the number of moles of Ca(OH)2 using the below formula

Recall, that the molar mass of Ca(OH)2 is 74.093 g/mol

Step 2; Find the volume of the solution in liters using the below formula

Therefore, the volume of the solution is 2.05 liters

Answer:

Object B has more density.

Explanation:

You have to use D=M/V to find the density. It is denser by 0.4167g.

At any given temperature, a sample of molecules has a thermal energy distribution plot with a bell-shaped curve. The higher the temperature, the more spread out the curve is. Because of this, a small change in temperature results in a large difference in the number of molecules having enough energy to overcome the activation barrier.

Temperature is a measure of the level or degree of heat on an object. Temperature shows the level of the amount of heat energy that is in the object.

Discussion:

The higher the temperature of an object, the hotter it is, and the more heat energy is in that object. The tool for measuring temperature is a thermometer.

For example, hot water has more heat energy than cold ice.

Temperature is one of the basic quantities, which cannot be derived from other quantities. Temperature is measured in Kelvin (in the International System), but in everyday use the most common measurement is degrees Celsius (°C). For example, the temperature of freezing water is 0°C, the temperature of the human body is about 37.5°C and the temperature of boiling water is about 100°C.

The Kelvin scale has many scientific uses, such as calculating temperature and its change in an ideal gas. The kelvin is the SI unit for temperature, where 0 K is absolute zero (at which there is no movement of particles, which is equivalent to -273 °C.

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Seawater does have a higher density than pure water, hence it's going to have a greater boiling point as well as a lower freezing point.

Boiling point is the temperature at which a liquid's internal pressure equals the external pressure applied by the liquid's vapour; in this situation, the addition of heat causes the liquid to turn in with its vapour without rising the temperature.

A liquid partially vaporizes into in the space above it at any temperature up until the vapour pressure equals the liquid's at that temperature, which is a characteristic value. Seawater does have a higher density than pure water, hence it's going to have a greater boiling point as well as a lower freezing point.

Therefore, seawater does have a higher density than pure water, hence it's going to have a greater boiling point as well as a lower freezing point.

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Answer:

i

Explanation:

The most common oxidation states of chromium are +6, +3, and +2. On the metal area of the periodic table.

Explanation:

The atomic ratio of carbon to oxygen in carbon monoxide (CO) is 1:1, and the atomic ratio of carbon to oxygen in carbon dioxide (CO₂) is 2:1.

Firstly, we can analyze the decomposition of carbon monoxide (CO) and carbon dioxide (CO₂) to determine the atomic ratios involved.

Let's denote the atomic ratio of carbon to oxygen in carbon monoxide as x, and the atomic ratio of carbon to oxygen in carbon dioxide as y.

According to the given data;

Decomposition of carbon monoxide (CO);

Oxygen produced = 3.36 g

Carbon produced = 2.52 g

We know that the atomic mass of carbon is 12 g/mol, and the atomic mass of oxygen is 16 g/mol. Using these values, we can calculate the number of moles for each element;

Number of moles of oxygen = mass / atomic mass = 3.36 g / 16 g/mol = 0.21 mol

Number of moles of carbon = mass / atomic mass = 2.52 g / 12 g/mol = 0.21 mol

Since the atomic ratio of carbon to oxygen in carbon monoxide is x, we can write the following equation;

0.21 mol C / (0.21 mol O) = x

Simplifying the equation, we have;

x = 1

Therefore, the atomic ratio of carbon to oxygen in carbon monoxide is 1:1.

Decomposition of carbon dioxide (CO₂);

Oxygen produced = 9.92 g

Carbon produced = 3.72 g

Following the same calculations as before;

Number of moles of oxygen = mass / atomic mass = 9.92 g / 16 g/mol = 0.62 mol

Number of moles of carbon = mass / atomic mass = 3.72 g / 12 g/mol = 0.31 mol

Since the atomic ratio of carbon to oxygen in carbon dioxide is y, we can write the following equation;

0.31 mol C / (0.62 mol O) = y

Simplifying the equation, we have;

y = 0.5

Therefore, the atomic ratio of carbon to oxygen in carbon dioxide is 1:0.5, which can be simplified to 2:1.

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--The given question is incomplete, the complete question is

"Missed this? watch kcv: atomic theory; read section 2.3. you can click on the review link to access the section in your text. carbon and oxygen form both carbon monoxide and carbon dioxide. when samples of these are decomposed, the carbon monoxide produces 3.36 g of oxygen and 2.52 g of carbon, while the carbon dioxide produces 9.92 g of oxygen and 3.72 g of carbon. Calculate the atomic ratio of carbon to oxygen in carbon monoxide, and carbon dioxide."--

Answer: By mass, about 96 percent of our bodies are made of four key elements: oxygen (65 percent), carbon (18.5 percent), hydrogen (9.5 percent) and nitrogen (3.3 percent). These elements do not give color to fireworks, but they are found in our body’s most abundant and important molecules, including water, proteins and DNA. The answer is B.

Explanation: I hope this helps. I got it from search.

Combining both effects, the 3- and 5-positions of the benzene ring appear to be the most favorable for incoming electrophiles. This is because these most negative positions overlap and become more attractive to positively charged electrophiles. Therefore, the possible structures of the iodination products are:

Since the 5-position is farther from the bulky amide group, it is more accessible to electrophiles, so the major product could be 5-iodosalicylamido.

In summary, the directing effect of substituents on salicylamide influences the possible structures of iodination products. The 3rd and 5th places are the most favorable because they overlap with the greatest negativity. The major product is probably 5-iodosalicylamido due to its easy access to incoming electrophiles.

The direct effect of substituents on salicylamides plays an important role in determining the possible structures of iodination products. The hydroxyl group (OH) is an activated ortho/para directing substituent. This means directing incoming electrophiles to the ortho and para positions of the benzene ring. On the other hand, the amide group is a meta-directing substituent that deactivates, meaning it directs incoming electrophiles to the meta-position of the benzene ring.

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Answer:

Last Column is:

Explanation:

98  ,   7.8   ,   371    and     0.98

The boiling point of the 1.3 m solution of C₆H₁₄ in benzene is  83.5 °C.

The boiling point of the 1.3 m (molality) solution of C₆H₁₄ in benzene is determined using the equation:

where

Given data:

Kb (benzene) = 2.65 °C/m

m = 1.3 m

Substituting the values into the equation:

ΔT = 2.65 °C/m * 1.3 m

ΔT = 3.445 °C

Boiling point of the solution = Boiling point of benzene + ΔT

Boiling point of the solution = 80.10 °C + 3.445 °C

Boiling point of the solution  = 83.545 °C

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Answer:

Although a single organism can survive without reproducing, organisms must reproduce in order to ensure the survival of the species.

The adjacent nucleotides are bound to each other through a phosphodiester bond in a nucleic acid.

Nucleic acid is a biopolymer made up of nucleotide monomers that make up nucleic acid chains. The nucleotide's three components are a five-carbon sugar, a phosphate group, and a nitrogenous base. Nucleic acids are present in all living cells, including viruses and bacteria, and they play a critical role in storing, transmitting, and expressing genetic information. RNA and DNA are two types of nucleic acids.

The phosphate group in one nucleotide forms a phosphodiester bond with the hydroxyl group on the sugar molecule of the next nucleotide in line in nucleic acids. This reaction is carried out by removing a molecule of water, resulting in a strong covalent bond between two nucleotides. These bonds make up the sugar-phosphate backbone of a nucleic acid chain, which is fundamental to its structure.

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Answer:

it is c

Explanation:

Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. Therefore the Charlotte's control group in this experiment is  not rubbing the cloth against the PVC pipe or the paper. The correct option is option C.

Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.

Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state. The Charlotte's control group in this experiment is  not rubbing the cloth against the PVC pipe or the paper.

Therefore the Charlotte's control group in this experiment is  not rubbing the cloth against the PVC pipe or the paper. The correct option is option C.

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Answer:

R = 8.314 pKa*L/mol*K

The value for the ideal gas constant (R) is approximately 8.314 kPa·L/(mol·K).

To determine the value for the ideal gas constant (R) when pressure (P) is in kilopascals (kPa), temperature (T) is in kelvins (K), volume (V) is in liters (L), and amount of gas (n) is in moles, we need to use the appropriate units for R based on these measurements.

The ideal gas constant, R, can be expressed in various units. The most common units for R are:

R = 0.0821 L·atm/(mol·K) (atmospheres, liters, moles, and kelvins)

However, since you provided the measurements in kilopascals, liters, moles, and kelvins, we need to use a different value for R that is consistent with these units:

R = 8.314 kPa·L/(mol·K)

Therefore, when pressure is in kilopascals, volume is in liters, amount of gas is in moles, and temperature is in kelvins, the value for the ideal gas constant (R) is approximately 8.314 kPa·L/(mol·K).

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