what are the Defence of keeping our body safe from diseases and viruses​

Answer:

d = 0.2 g/cm³

General Formulas and Concepts:

Density = mass / volume

Explanation:

Step 1: Define

m = 100 g

V = 500 cm³

d = ?

Step 2: Find density

Answer:

iron (Fe), nickel (Ni), or cobalt (Co)

Explanation:

Answer: 9.8 meters per second

Explanation:

Answer:

All the noble gases have the full number of electrons in each layer.

Explanation:

For example, neon is a noble gas. The first layer of electrons is full since it contains the max amount of electrons which is 2. The next layer is also full, since it contains 8 electrons which is the max amount it can hold.

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Neurons mostly receive signals that are excitatory ; others, however, are  inhibitory.

A neuron will generate action potentials more often when it receives more excitatory than inhibitory inputs.A neuron receives both excitatory and inhibitory inputs from the many other neurons it is connected to at synaptic junctions.

                   For an action potential to be generated in a neuron, the sum of the excitatory inputs must be greater than that of the inhibitory inputs.

Neurotransmitters are the chemical messengers in the body, which are released by the axon terminal of neuron ( also called nerve cell) and transmit nerve impulse to the neighboring cell ( which could be a muscle cell or a nerve cell) .

There are primarily two types of neurotransmitters that are-

1) Excitatory neurotransmitter and 2) Inhibitory neurotransmitter.

Inhibitory neurotransmitter have inhibitory effects on the neuron that is they reduce the chances that a neuron will fire an action potential. In other words, they are responsible for slowing signals between neurons.

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Equation I cannot be divided by another factor as it will introduce errors in the equation.

Errors in chemical analysis result when there is a difference between observed value and the true value.If the magnitude of errors is large , it results in decrease in accuracy, reproducibility, and precision.

There are three types of errors:1) random error 2) systematic error 3) human error.The cause of random errors are difficult to quantify while the human errors can be minimized by taking a range of readings to reduce the error.

Errors while measuring boiling point may be human errors while noting down the boiling temperature or instrumental or systematic error if there is a fault in the thermometer.

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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The correct option is d. Both contain α−(1>4) glycosidic linkages of D-glucose, but amylopectin also has α−(1−>6) branches.

The main difference between α-amylose and amylopectin is their structure. α-amylose is a linear polymer of α−(1>4) glycosidic linkages of D-glucose, with no branching. On the other hand, amylopectin is a branched polymer of α−(1>4) glycosidic linkages of D-glucose, with α−(1−>6) branches occurring every 24-30 glucose units. These branches create a highly branched structure that makes amylopectin more soluble and digestible than α-amylose.

Therefore, the correct option is d.

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Answer:

Number of moles = 2.72 mol

Explanation:

Given data:

Number of moles of H₃PO₄ present = ?

Molarity of solution = 18.1 M

Volume of solution = 150.0 mL (150/1000 = 0.15 L)

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

By putting values,

18.1 M = number of moles / 0.15 L

Number of miles = 18.1 M × 0.15 L

Number of moles = 2.72 mol

Answer:

In a chemical reaction, only atoms are present in the reactant and can end up with molecules. No new atoms are created and no more atoms are destroyed. In a chemical reaction, reactants contact with each other and the bond between atoms in the reactant is broken and atoms rearrange and form new bonds to make the product.

Explanation:

Answer:

The greater the frequency means the more energy transferred.

The greater the wavelength means the less energy transferred

To produce one molecule of glucose, 6 molecules of carbon dioxide (\(CO_{2}\)), 18 molecules of adenosine triphosphate (ATP), and 12 molecules of nicotinamide adenine dinucleotide phosphate (NADPH) are required.

Glucose, a six-carbon sugar, is synthesized through the process of photosynthesis in plants. It involves the Calvin cycle, which incorporates carbon dioxide, ATP, and NADPH to produce glucose. For each molecule of glucose formed, 6 molecules of carbon dioxide are required.

The energy needed for glucose synthesis is provided by ATP, which is an energy-rich molecule. In the Calvin cycle, the synthesis of one glucose molecule requires 18 molecules of ATP.

NADPH, a coenzyme involved in energy transfer reactions, is required for the reduction of carbon dioxide during the Calvin cycle. In the process, 12 molecules of NADPH are utilized to produce one molecule of glucose. These components play crucial roles in capturing and storing energy, as well as providing carbon atoms for the formation of glucose, which serves as a vital energy source for organisms.

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The formula for calculating the concentration of a solution in mg/L is as follows:Concentration in mg/L = (weight of solute in mg / volume of solution in L). Concentration in mg/L = (0.5 g × 1000 mg/g) / 0.5 L. Concentration in mg/L = 1000 mg/L.

(b) The formula for calculating the concentration of a solution in ppm is as follows:

Concentration in ppm = (weight of solute in mg / volume of solution in ml) × 10³.

Concentration in ppm = (0.5 g × 1000 mg/g) / 500 ml × 10³.

Concentration in ppm = 1000 ppm.

(c)The formula for calculating the concentration of a solution in ppb is as follows:

Concentration in ppb = (weight of solute in mg / volume of solution in ml) × 10⁶.

Concentration in ppb = (0.5 g × 1000 mg/g) / 500 ml × 10⁶.

Concentration in ppb = 1000000 ppb.

(d) Moles/lThe molecular weight of KCl is 74.55 g/mol.

To calculate the concentration of KCl in moles/liter, we must first convert 0.5 g to moles.

Number of moles = weight / molecular weight.

Number of moles of KCl = 0.5 g / 74.55 g/mol.

Number of moles of KCl = 0.0067 moles.

Concentration in moles/liter = number of moles / volume in L.

Concentration in moles/liter = 0.0067 moles / 0.5 L.

Concentration in moles/liter = 0.013 M (M = moles/L).

Therefore, the concentration of KCl is (a) 1000 mg/L, (b) 1000 ppm, (c) 1000000 ppb, and (d) 0.013 M.

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Answer:

Ca2+ represents an ion with 20 protons and 18 electrons.

Explanation:

A calcium atom has 20 protons and 20 electrons. The 2+ charge next to the symbol indicates a loss of two electrons: 20-2=18.

Based on the information provided in the student question, we can deduce the structure of the unknown compound step-by-step:

1. The molecular formula C6H14O indicates that the compound contains 6 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom.

2. Since the compound is a liquid at room temperature and slightly soluble in water, it suggests the presence of a polar functional group, such as an alcohol (OH) group.

3. The reaction with sodium metal and the evolution of gas indicates that the compound likely contains an acidic hydrogen atom, which further supports the presence of an alcohol group.

Now, considering the possible constitutional isomers for the given molecular formula:

- Hexanol isomers (1-hexanol, 2-hexanol, 3-hexanol, etc.): These would all show a similar H-NMR spectrum due to the similar structure, and would meet the requirements of a liquid at room temperature and reacting with sodium metal to release gas.

- Methylpentanol isomers (2-methyl-2-pentanol, 3-methyl-2-pentanol, etc.): These isomers would also show similar H-NMR spectra, but would differ slightly from the hexanol isomers.

To assign a specific structure to the unknown compound, we would need more information about the H-NMR spectrum, such as peak positions, splitting patterns, and integration values. This additional data would help to identify the exact positions of the alcohol group and any branching in the carbon chain, allowing us to distinguish between different constitutional isomers.

Answer:

7g

Explanation:

Given parameters:

Mass of sodium  = 3g

Mass of chlorine  = 4g

Unknown:

Total mass of sodium chloride  = ?

Solution:

This problem entails the direct application of the law of conservation of mass. According to this law, it states that "matter is neither created nor destroyed in the course of a chemical reaction".

So, when sodium and chlorine combines to form sodium chloride, to are expect to produce substance with a mass which adds up to the sum of the reactants;

  Mass of sodium chloride  = mass of sodium + mass of chlorine

                                              = 3g + 4g

                                              = 7g

The rate of change of volume with respect to pressure dP/dV = -C/P^2

What is  Boyle's law?

Boyle's law is a gas law that states the pressure exerted by a gas (of a given mass and temperature) is inversely proportional to the volume it occupies. The gas law states that the pressure exerted by a gas (of a given mass and temperature) is inversely proportional to its volume.

In accordance with Boyle's law When the temperature remains constant, the relationship between pressure and volume is inversely proportion

P ∝ 1/V

PV = C

V= C/P

Boyle's law stipulates When the temperature is constant, pressure is inversely proportional to volume.

dP/dV = -C/P^2

Hence, this is the rate of volume change relative to pressure.

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The term is Allotropy

Which means that an element can exist in two or more forms with the same physical state but different structures

The only incorrect statement in the diagram is (d) Cr202-7 can be used in aqueous H2SO4.

Option (d) is incorrect because the half-cell reaction involving Cr2O7^2- and H+ (aq) produces H2CrO4, which can decompose in acidic solutions, leading to inaccurate results. Therefore, Cr2O7^2- should not be used in aqueous H2SO4 for the quantitative estimation of Fe(NO3)2-.

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The Only incorrect statement is option C

Electrochemistry is a branch of chemistry that deals with the study of the relationship between electrical energy and chemical reactions.

It involves the study of the behavior of electrons and ions in chemical reactions that occur in a solution or at the interface between two different phases, such as a solid electrode and a liquid electrolyte.

We can see that it is better to use HCl instead of the use of the H2SO4 acid as we have in the options.

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Answer:  13 atoms.

Explanation:

The symbol for barium phosphate is Ba3(PO4)2. In 1 formula unit of barium phosphate there are 3 atoms of barium (Ba) (2)(1) = 2 atoms of phosphorus (P) (2)(4) = 8 atoms of oxygen (O) The total is 3 + 2 + 8 = 13 atoms.

Answer:

the medium

Explanation:

that is what medium is

Answer:

A medium.

Explanation:

A medium is a material that waves can travel through. A medium can be in the form of a solid, a liquid, or a gas.


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Answer:

D

Explanation:

The list of elements in order from most conductive to least conductive is potassium (K), germanium (Ge), selenium (Se).

Conductive is defined as the materials permit the flow or passage of electrical current, whether carried by electrons or ions.

It can also be defined as conductive hearing loss caused by failure in the systems for sound transmission in the external or middle ear.

There are four types of conductor.

Elements are defined as a pure substance made up of only one sort of atom with the same number of protons in its nucleus.

It can also be defined as any compound that cannot be broken down into smaller chemicals using standard chemical procedures.

There are three types of elements.

Potassium is the most metallic element on the list, and as a result, it has the highest conductivity (1.4 107 S/m), followed by the semiconductor germanium (2000 S/m). The least electrical conductivity is found in selenium i.e. it may be a insulator.

Thus, the list of elements in order from most conductive to least conductive is potassium (K), germanium (Ge), selenium (Se).

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Answer:yes

Explanation:

Because modern periodic table is designed in such a way that it can accomodate any new elemet which may be discovered in future

We have that for the Question "when and if element 119 is discovered predict where it would be placed on the modern periodic table" it can be said that With the existing information the element 119 will most likely be i the 8th period and the first group of the periodic table

From the question we are told

when and if element 119 is discovered predict where it would be placed on the modern periodic table

Generally

The Periodic table is naturally designed to accommodate new elements based on there properties

Therefore

With the existing information the element 119 will most likely be i the 8th period and the first group of the periodic table

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Nuclear fusion is a process through which the nucleus fuse together just to generate heavier nuclei. Extremely high temperatures can force atoms together, allowing the nuclear charge to connect.

Therefore the answer is "Option D".

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Answer:

answer is D, took the test chem connexus

Explanation:

Two different samples of matter are measured in each of these glass containers. Both of the containers show the same measure for both samples of matter. These samples have volume in common.

In chemistry, volume is defined as the three-dimensional space taken up by matter. Volume is measured in cubic meters.

If you were to put two different samples in a graduated glass container and both of them have the particular digit that shows their volume then it means their volume is the same and they take up the same amount of space irrespective of their chemical composition.

For example, if you pour the sample into a glass container and the number you get is 250 m³.

Then this 250 m³ refers to the volume of the sample.

In general, volume is measured as volume =  mass/density and its SI unit is m³.

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For a reaction  2Na + 2H2O --> 2NaOH + H2,  The moles of Na needed to produce exactly 5.6 liters of H2 is mathematically given as

moles of H2=0.125mole

Generally, the equation for the  Chemical Reaction is mathematically given as

2Na + 2H2O -> 2NaOH + H2(g)

Therefore, since 2Na gives 1H2

PV=nRT

Hence

n=PV/RT

n=1*5.6/0.0821 *273

n=0.249mols

In conclusion,The moles is

2Na=1H2

moles of H2=0.125mole

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Compound          Type of IMFs                   Sublime at STP?

Carbon dioxide       London dispersion         Yes

Hydrogen fluoride  Hydrogen bonding   No

Calcium chloride     Ionic bonding                  No

Naphthalene        London dispersion         Yes

Iodine                      London dispersion        Yes

Sodium chloride        Ionic bonding                 No

Water                    Hydrogen bonding         No

A chemical compound is described as  a chemical substance composed of many identical molecules containing atoms from more than one chemical element held together by chemical bonds.

London dispersion forces are also described as a type of intermolecular force acting between atoms and molecules that are normally electrically symmetric.

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Answer:

C & D

Explanation:

The attractive force between particles of a liquid determines the temperature at which the liquid changes state: the stronger the attraction, the larger amount of energy is required to break the bonds to boil; i.e. at a higher temperature. So C. Strong attractions mean the liquid boils at a higher temperature is correct.

By the same reasoning, the stronger attractive force between particles also means that it takes more energy to change state from solid to liquid; i.e. a higher melting point.  So D. Strong attractions mean the liquid melts at a higher temperature is also correct.

Answer:  the number of grams of AgNO3 present in its 7.4 moles is 1257.