Which of the following greenhouse gases is entirely the result of human activity Mcq? 1. Methane
2. Carbon dioxide
3. Nitrous oxide
4. Chlorofluorocarbons

The volume of  1.33 mol/L calcium bromide solution that contains 125 g of calcium bromide is 470 mL

The volume can be calculate as follows:

First we should calculate the moles of calcium bromide

The moles of calcium bromide = Mass/ mass molar

The moles of calcium bromide = 125 g / 199.89 g/mol

The moles of calcium bromide = 0.625 moles

from de question we know that the molar of the solution is 1.33 mol/l

we also know that Molar = moles/ volume

so the volume is gonna be

volume= moles/ molar

volume = 0.625 moles/ 1.33 mol/L = 0.47 L = 470 mL

Therefore, the volume of  1.33 mol/L calcium bromide solution that contains 125 g of calcium bromide is 470 mL

Your question is incomplete but most probably your full question was

calculate the volume in milliliters of a 1.33 mol/L calcium bromide solution that contains 125 g of calcium bromide . be sure your answer has the correct number of significant digits.

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Answer:

yes because I wouldn't do it

Answer:

The presence of drugs or chemicals in an organisms environment can also influence gene expression in the orgains.

To determine the mass percent of chloride in the original sample, we need to first calculate the amount of chloride present in the sample. We can do this by using the balanced equation for the reaction between chloride and silver nitrate:

AgNO3 + Cl- → AgCl + NO3-

First, we need to calculate the number of moles of silver nitrate used in the titration:

moles of AgNO3 = volume (L) x molarity (M) = 0.03083 L x 0.7890 M = 0.02439 moles

Next, we can use the balanced equation to find the number of moles of chloride:

moles of Cl- = moles of AgNO3 = 0.02439 moles

Finally, we can use the number of moles of chloride to calculate the mass of chloride in the sample:

mass of Cl- = moles of Cl- x molar mass of Cl- = 0.02439 moles x 35.5 g/mol = 0.868 g

To find the mass percent of chloride in the original sample, we divide the mass of chloride by the total mass of the sample and multiply by 100%.

mass percent of Cl- = (mass of Cl- / total mass of sample) x 100%

Since we don't know the total mass of the sample, we can use the mass of chloride we just calculated and the formula above to find the mass percent of chloride in the original sample.

mass percent of Cl- = (0.868 g / 0.1599 g) x 100% = 54.3%

So, the mass percent of chloride in the original sample is 54.3%.

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Answer:

To be stable an atom will gain, lose, or share electrons to complete the outer most energy level (electron shell). Octet Rule because levels 2 and 3 need 8 electrons to be stable.

The chemical formula of this compound is NBr₂Cl.

A chemical formula shows the elements in a compound and the relative proportions of those elements.

The name of this compound is N,N-dibromochloroamine.

Molar mass of the compound NBr₂Cl is 209.26 g/mol.

Nitrogen is the central atom in this compound (see the picture below).

Electron configuration for nitrogen: ₇N 1s² 2s² 2p³.

Electron configuration of chlorine atom: ₁₇Cl 1s² 2s² 2p⁶ 3s² 3p⁵.

Electron configuration of bromine: ₃₅Br 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵.

Nitrogen is in group 15 of Periodic table of elements and his atomic number is seven, which means that nitrogen has seven electrons.

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In the reaction as follows: HCLO2 + H2O = H3O+ + ClO2-

CONJUGATE ACID AND BASE:

In the following reaction: HClO2 + H2O = H3O+ + ClO2-

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Note that the formula for momentum is P = mv, where P is momentum, m is mass, and v is velocity. This being said, simply apply the given data into the formula to find our solution.

\(P=mv\)

\(P=0.4\) × \(19.0\)

\(P = 7.6 kg *m/s\)

Hope this helps!

Answer:

I think it's D, cicada.

According to Oxford, a Hemipteran is "an insect of the order Hemiptera, such as an aphid, cicada, or leafhopper."

Hope this helps! I also hope it's not wrong, but I do not think it is.

Also please let me know if this is correct.

Answer:

S = d/t s = 400m/ 20 sec = 20m/s

Explanation:

Answer:

3s^1 would be 3s^2

Explanation:

Answer:

Reactivity increases down the group

Explanation:

This is because metals reaction involves loss of an electron from an occupied orbital.

As we go down the group the relative nuclear charge decreases due to an additional orbit leading to ease in loss of an electron

Due to ease in loss of electrons down the group metals become more reactive down the group

Answer:

how many colors are there

To determine the molar mass of the element, we will use the formula:$$\mathrm{Molar\ mass}=\frac{\mathrm{Density}}{\mathrm{Moles}/\mathrm{Volume}}$$Given:$$\mathrm{Density}=13.55\:\mathrm{g/cm^3}$$$$\mathrm{Moles}=1.16\:\mathrm{mol}$$$$\mathrm{Volume}=17.17\:\mathrm{cm^3}$$.

Given that, density = 13.55 g/cm3molar mass = ?mass of sample = density x volume$$\therefore \ \text{mass of sample} = \mathrm{density} \times \mathrm{volume}$$$$\Rightarrow\mathrm{mass} =13.55 \:\mathrm{g/cm^3} \times 17.17 \:\mathrm{cm^3}=232.7315\:\mathrm{g}$$Now, Molar mass is given by,$$\mathrm{Molar\ mass}=\frac{\mathrm{Density}}{\mathrm{Moles}/\mathrm{Volume}}$$$$\Rightarrow\mathrm{Molar\ mass}=\frac{13.55\:\mathrm{g/cm^3}}{1.16\:\mathrm{mol}/17.17\:\mathrm{cm^3}}=103.1\:\mathrm{g/mol}$$Therefore, the molar mass of the element is 103.1 g/mol.

The given information is about the element's sample. The formula for molar mass is used to find out the unknown molar mass of the given element.

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Moles are the quantity of a substance that is found in the atom or the molecules. 0.85 moles of zinc iodide will be produced from the reaction between hydroiodic acid and zinc bromide.

What is the mole in chemistry?

The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is “mol”.

The balanced reaction is  -

2HI + ZnBr2 → 2HBr + ZnI2.

Moles of hydroiodic acid = 1.7 moles

Moles of zinc bromide = 3.43 moles

From the reaction, it can be said that 2 moles of hydroiodic acid need 1 mole of zinc bromide.

So, the moles of zinc bromide that will react in the reaction are:

1.7/2 = 0.85 moles

Hence, hydroiodic acid is a limiting reactant, and zinc bromide will remain in the reaction as it is an excess reagent.

Moles of zinc iodide is calculated from the limiting reagent:

1.7/2 = 0.85 moles

Therefore, 0.85 moles of zinc iodide are formed.

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0.30moles is the moles of H\(_3\)PO\(_4\). a mole, sometimes spelt mol, is a common scientific measurement unit.

In chemistry, a mole, sometimes spelt mol, is a common scientific measurement unit for significant amounts of extremely small objects like atoms, molecules, or even other predetermined particles. The mole signifies  6.022×10²³  units, which is a very big quantity.

Under the International System of Units (SI), the mole is defined as this quantity as of May 20, 2019, according the General Conference upon Weights and Measurements. The amount of atoms discovered via experimentation to be present within 12 grams pure carbon-12 was originally used to define the mole.

mole = given mass/ molar mass

        = 30.00/97.9

        =0.30moles

Therefore, 0.30moles is the moles of H\(_3\)PO\(_4\).

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Answer: IONIC EQUATION.

Explanation:

A chemical equation is defined as the form by which a chemical reaction is represented mathematically. These are written in the form of symbols and chemical formulas of reactants and products which are taking part in the chemical reaction. A chemical equation can be written in two forms, these include:

--> MOLECULAR EQUATION: in this type of equations, the compounds are written and represented in a molecular form. This is sometimes referred to as a balanced equation.

--> IONIC EQUATION: This is a type of chemical equation in which the electrolytes in aqueous solution are expressed as dissociated ions. A typical illustrated example is seen in the reaction between AgNO3(aq) and NaCl(aq) :

Ag+(aq) + NO3-(aq) + Na+(aq) + Cl-(aq) → AgCl(s) + Na+(aq) + NO3-(aq)

The (aq) written in the above equation signifies they are in aqueous solution.

Answer:

fsdafdsafdsafdsafdasfsagfd

Explanation:

Answer:

A polypeptide chain!

Explanation:

Hopefully this helps! If this wasn't the answer you were looking for please don't hesitate to comment here or private message me! Have a nice day/night! :))

Amino acids are the fundamental building blocks of proteins. In the cell, amino acid molecules combine to form polypeptide chain or protein.

The term amino acids are defined as the building block of the protein. Amino acids are the fundamental building blocks of proteins. Their molecule contains both an amino and a carboxylic group.

Alpha-amino acids are amino acids that have an amino and a carboxyl group attached to the same carbon atom, i.e., an alpha-carbon atom. Glycine, Alanine, etc.

Proteins are made up of monomers called amino acids. A protein is composed of one or more linear chains of amino acids, each of which is referred to as a polypeptide.

Thus, In the cell, amino acid molecules combine to form polypeptide chain or protein.

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The melting of solid wax to form liquid wax and the evaporation of liquid wax to form wax vapor are physical changes. The burning of the wax vapor is a chemical change.

All of the statements about electron and compound microscopes are true except option (b), which states that an electron microscope is more appropriate for analyzing living prokaryotic cells.

Option (b) states that an electron microscope is more appropriate for analyzing living prokaryotic cells. However, this statement is not true. Electron microscopes are not typically used for observing living cells, whether prokaryotic or eukaryotic.

Live cells are more commonly observed using a compound microscope, which allows for real-time imaging and the study of cellular processes in living specimens.

The other statements are true. Option (a) correctly states that an electron microscope cannot be used to look at living cells due to the sample preparation requirements. Option (c) is true as electron microscopes use beams of electrons, rather than light, to visualize an image.

Option (d) is also true as electron microscopes generally have a higher magnification capability compared to compound microscopes, allowing for the observation of smaller details at a higher resolution.

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All of the statements about electron and compound microscopes are true except option (b), which states that an electron microscope is more appropriate for analyzing living prokaryotic cells.

Option (b) states that an electron microscope is more appropriate for analyzing living prokaryotic cells. However, this statement is not true. Electron microscopes are not typically used for observing living cells, whether prokaryotic or eukaryotic.

Live cells are more commonly observed using a compound microscope, which allows for real-time imaging and the study of cellular processes in living specimens.

The other statements are true. Option (a) correctly states that an electron microscope cannot be used to look at living cells due to the sample preparation requirements. Option (c) is true as electron microscopes use beams of electrons, rather than light, to visualize an image.

Option (d) is also true as electron microscopes generally have a higher magnification capability compared to compound microscopes, allowing for the observation of smaller details at a higher resolution.

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Answer:

C.

Explanation:

Answer A is incorrect because a compound doesn't have to be made with only metals.

Answer B is incorrect because that is actually the definition of a pure element.

Answer C is correct because to make a compound, there has to be a chemical reaction where bonds are formed and an entirely new substance is created.

Answer D is incorrect because compounds cannot be separated by physical means.

Hope this helps :D

Answer:

Chemical formula

Explanation:

because chemical formulas use chemical elements , symbols , and numbers to present information about the chemical proportions.

According to the statement you do every time you are setting up glassware for a vacuum filtration are:

1. Check that there are no cracks or defects in the glassware.

2. Ensure that the glassware is designed for use with a vacuum.

3. Inspect the tubing for any holes.

By removing the air beneath the filter paper, vacuum filtration maintains a pressure differential across the filter media. Filtration under a vacuum accelerates the process and exerts a force on the mixture in addition to gravity.

The collection of a particle (bacteria, precipitate, etc.) from with a liquid suspension typically involves vacuum filtration in microbiological and laboratory operations.

Vacuum and gravity filtering differ primarily in their efficiency and mode of operation. The filtration is powered by one technique, which employs a vacuum source, and by the other, which uses gravity. Vacuum filtering becomes quicker and more practical as a result. However, it doesn't apply to all experiments.

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An ion of Na+ (sodium) with a charge of +1 would most likely ionically bond with an atom of Cl- (chlorine) in a 1:1 ratio.  option(c)

Ionic bonding occurs between a metal and a nonmetal, where the metal loses electrons to form a positively charged ion (cation), and the nonmetal gains those electrons to form a negatively charged ion (anion).

Sodium, a metal, readily loses one electron to achieve a stable electron configuration similar to that of the noble gas neon. This results in the formation of Na+ ion with a +1 charge. Chlorine, a nonmetal, has seven valence electrons and requires one additional electron to attain the electron configuration of the noble gas argon. Therefore, chlorine readily accepts one electron, forming a Cl- ion with a -1 charge.

The 1:1 ratio of sodium to chlorine ions allows for the transfer of one electron from sodium to chlorine, resulting in the formation of the ionic compound sodium chloride (NaCl), commonly known as table salt. The electrostatic attraction between the oppositely charged ions holds the compound together in a crystal lattice structure. option(c)

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Answer:

2

5

3