Magnesium (Mg) has an atomic number of 12. What is the ground-state electron configuration of magnesium?

1s21p62s22p2
1s21p61d4
1s22s22p63s2
1s22s22p62d2

Answer:

1. Isotopes are atoms of an element that consist of the same number of protons but a different number of neutrons.

2. No. of protons = 13

 No. of neutrons = 27 - 13

                            = 14

3. refer to attached file

4(a). Since the noble gases can be found in group 18 of the periodic table, it suggests that they have a complete octet (a full valence shell of electrons), and this allows them to be stable gases that show the least reactivity.

4(b). Since the number of protons and electrons are equal in an atom, the opposite charges are balanced and thus, there is no net charge on the atom (neutrons present in the atom have no charge). Hence, an atom is electrically neutral.

5. Mass no. of X = 6 + 6

                           = 12

   Mass no. of Y = 6 + 8

                           = 14

6. mass number = no. of protons in the nucleus of an atom + no. of neutrons in the nucleus of an atom

atomic number = no. of protons in the nucleus of an atom

isobars = atoms of elements which have the same mass number but different atomic numbers

isotopes = atoms of elements which have the same number of protons but a different number of neutrons

Answer:

The answer is

21.5 L

.

So, start with the balanced chemical equation for the decomposition of hydrochloric acid

2

HCl

→

H

2

+

Cl

2

Notice that you have a

2:1

mole ratio between

HCl

and

Cl

2

, which means that every 2 moles of the former will produce 1 mole of the latter. The number of moles of

HCl

you have is.

Explanation:

I don't know if that is but I try my best just correct me if I'm wrong thank you!!

Unique properties of water

Water molecules have a bent overall structure, partial positive charges on the hydrogens, partial negative charges on the oxygen, and are polar. This is due to the fact that oxygen is more electronegative than hydrogen, making it more effective at drawing electrons. Excellent solvents include water.

Temperature alters the three states of water, which are solid (frozen), liquid, and gas. Although the interactions of the water molecules change, the molecules themselves do not alter between the phases.

Water quality's physical characteristics

Color: Polluted water may be coloured; pure water is colourless.

Turbidity: Clear, light-unabsorbing water is the opposite of pure water.

Taste and odour: Pure water never has a taste or an odour.

Given their polar nature, water molecules form hydrogen bonds. This gives water its distinctive properties, including polarity, solvency, cohesion, adhesion, high specific heat, and the capacity to act as a buffer. A solute that has dissolved in a solvent creates a homogeneous mixture known as a solution.

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Answer:

Explanation:

Hi there!

We have,

1 mole of Al = 6.23*\(10^{23}\) atoms

Also given no. of atoms = 3.90 x \(10^{22}\) atoms

Now,

6.23*\(10^{23}\) atoms= 1 mole

1 atom = \(\frac{1 }{6.23*10^{23}}\) moles

or, 3.90 x \(10^{22}\) atoms =  \(\frac{1 }{6.23*10^{23}}\) *3.90 x \(10^{22}\) moles

Therefore, 3.90 x \(10^{22}\) atoms has 0.0626 mols of Al.

Hope it helps!

Decreasing the volume of the system to half of its original value and increasing the volume of the system to twice its original value have the potential to change the equilibrium.

Equilibrium refers to a state of balance between two opposing forces or processes, where the concentrations of reactants and products remain constant over time. In other words, the rates of the forward and reverse reactions are equal, resulting in no net change in the concentrations of the reactants and products. At equilibrium, the system is said to be in a steady state, and the equilibrium constant (Kc) represents the ratio of the concentrations of products to reactants at equilibrium.

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Answer:

92

Explanation:

Answer:

255.5cm³

Explanation:

A solution that is 38.08 % by weight has 38.08g of sulfuric acid per 100g of total solution. Thus, mass of solution you need to obtain 125g is:

125g H₂SO₄ × (100g solution / 38.08g H₂SO₄) = 328.3g of solution

As density of the solution is 1.285g / cm³, the volume of 328.3g is:

328.3g × (1cm³ / 1.285g) = 255.5cm³

A strong covalent bond between amino acids that functions in maintaining a polypeptide's specific three-dimensional shape is a disulfide bond.

Disulfide bonds are covalent bonds formed between the sulfur atoms of two cysteine residues in a polypeptide chain. These bonds play a crucial role in stabilizing the tertiary structure of proteins by holding specific regions together. Cysteine is an amino acid with a unique property; it contains a sulfur atom within its side chain. When two cysteine residues come close to each other in the protein's three-dimensional structure, the sulfur atoms can undergo oxidation, resulting in the formation of a covalent disulfide bond (S-S bond). This bond is relatively strong and can withstand the harsh conditions within the cell, contributing to the protein's stability.

Disulfide bonds are essential for maintaining the proper folding and structural integrity of many proteins. They help stabilize the protein's tertiary structure by forming bridges between distant parts of the polypeptide chain. These bonds are particularly important in proteins secreted outside the cell or proteins that are exposed to the extracellular environment, as they provide resistance against denaturation and proteolytic degradation.

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To raise the temperature of a 10.35g sample of carbon tetrachloride from 32.1°c to 56.4°c, 222.92J heat is required.

Heat is a form of energy and it is associated with the motion of particles. The amount of heat required to change the temperature of a substance depends on its mass, the specific heat capacity of the substance and the change in temperature.

The mass of carbon tetrachloride is given as 10.35g. The specific heat capacity of carbon tetrachloride is given as 0.85651 J/g°C and the change in temperature is given as 24.3°C. Putting these values into the formula: q = m × C × ΔTq = 10.35 g × 0.85651 J/g°C × 24.3°Cq = 222.92 J. Therefore, 222.92 Joules of heat are required to raise the temperature of a 10.35g sample of carbon tetrachloride from 32.1°c to 56.4°c.

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Answer: Uhmmmm this is what i got...-

Explanation:

It is a matter of fact that the hydrophobic (water-hating) oily compounds of cannabinoids such as CBD, THC and others are not water soluble. The term "water soluble" refers to materials which dissolve in water in a homogenous manner by becoming molecules or ions (such as sugar, alcohol, and salt).

Answer:the answer is C

Explanation:

Answer:

342g/mol

Explanation:

Molar mass of carbon=12, hydrogen=1 and oxygen=16

therefore C12H22O11=12(12)+22(1)+11(16)

=144+22+176

=342g/mol

Explanation:

✩ The main jobs of digestive system are as follows :

✩ The main jobs of excretory system are as follows :

Hope I helped ! ♡

Have a wonderful day / night ! ツ

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0.002 liters of 225 M Na2S solution is required to completely react with 81.8 g Fe(C2H3O2)3

Starting from the balanced equation of the reaction and the molar mass of iron (III) acetate (Fe(C2H3O2)3, first the reacting moles of this compound are determined, then the amount of reacting moles of sodium sulfide (Na2S) is determined and finally the amount of solution that contains said amount of moles.

3Na2S + 2Fe(C2H3O2)3 → 6NaC2H3O2 + Fe2S3

This determination is made in three steps:

If 233.00 g of Fe(C2H3O2)3 is equivalent to 1 mol of Fe(C2H3O2)3

So 81. 8 g Fe(C2H3O2)3 equals x mol of Fe(C2H3O2)3

X mol of Fe(C2H3O2)3 = 81. 8 g Fe(C2H3O2)3 x 1 mol of Fe(C2H3O2)3 / 233.00 g of Fe(C2H3O2)3

X mol of Fe(C2H3O2)3 = 0.351 mol

If 2 moles of Fe(C2H3O2)3 react with 3 moles of Na2S

Then 0.351 mol of Fe(C2H3O2)3 reacts with x mol of Na2S

X mol of Na2S = 0.351 mol Fe(C2H3O2)3 x 3 mol of Na2S / 2 mol of Fe(C2H3O2)3 = 0.526 mol

If there are 225 moles of Na2S in 1 liter of solution

So there are 0.526 moles of Na2S in x liter of solution.

X liter of solution = 0.526 mol of Na2S x 1 liter of solution / 225 mol of Na2S = 0.0023 liters, that is, 2.3 ml

Therefore, 0.0023 liters of 225M Na2S solution is required.

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Explanation:

i found this the question is different but I think the situation is same

Answer:

it's an acid

Explanation:

because itis soda

According to the solubility graph of KNO₃, 0.160 moles  would have to be added to 100 g of water to form a saturated solution at 10°C.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.

At 40°C 67 g potassium nitrate is soluble thus at 10°C 10×67/40= 16.25 g is soluble which is 16.25/101.10= 0.160 moles.

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The equation related to reaction between Sulfur dioxide and oxygen to produce sulfur trioxide is 2SO\(_2\)(g) + O\(_2\)(g) \(\rightarrow\) 2SO\(_3\) (g).  SO\(_2\)  is limiting reagent.

The reactant that controls how much of the products are generated inside a chemical reaction is known as the limiting reagent. Since some of the other reactants remain that after limiting reagent has been used fully, it is occasionally discovered that they are in excess in the reactions. The theoretical yield is the most product that can theoretically be produced.

2SO\(_2\)(g) + O\(_2\)(g) \(\rightarrow\) 2SO\(_3\) (g)

moles of SO\(_2\) =20.0 g / 64.07

                      =0.312moles

moles of O\(_2\)= 15.6 g/32

                   =0.487moles

On dividing the moles by stoichiometry, out of  O\(_2\) and SO\(_2\), SO\(_2\)  is limiting reagent.

Therefore,  the equation related to reaction between Sulfur dioxide and oxygen to produce sulfur trioxide is 2SO\(_2\)(g) + O\(_2\)(g) \(\rightarrow\) 2SO\(_3\) (g).  SO\(_2\)  is limiting reagent.

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The density of the substance having a mass of 2.0 g is 0.4 g/mL (Option D)

First, we shall obtain the volume of the substance. This can be obtained as follow:

Volume of substance = (Volume of water + substance) - (Volume of water)

Volume of substance = 75 - 70

Volume of substance = 5 mL

Finally, we shall determine the density of the substance. This is illustrated below:

Density = mass / volume

Density of substance = 2 / 5

Density of substance = 0.4 g/mL

Thus, the density is 0.4 g/mL (Option D)

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Answer:3.00 x 10(8) m/s=7.25x108m

Explanation:

Sorry, I only got this far.

Answer:

426 mg = 4.26 x 10² mg

Explanation:

1 cup = 237.6 mL x 1 L/1000 mL = 0.2376 L

We divide the liters of milk the student drinks into the volume in liters of a cup to calculate the number of cups the student drinks per day:

number of cups per day = 0.318 L/0.2376 L = 1.34 cup

Now, we multiply the number of cups by the amount of calcium that a cup of milk has:

amount of calcium = 1.34 cup x 318 mg = 426 mg = 4.26 x 10² mg

Therefore, the student gets 426 mg (or 4.26 x 10² mg) of calcium in one day.

Answer:

Potential energy

Explanation:

When an object is moving its called Potential energy.

When an object is not moving it is called kinetic energy.

1. The type of polymer that would you obtain if sorbitol is a polyol.

2a. The use of starch-borate and starch-glycerol polymers for the encapsulation of pharmaceutical drugs or pesticides would have a number of beneficial effects.

2b. Yes, these polymers are considered to be biodegradable.

1. The type of polymer that would you obtain if sorbitol (a sugar alcohol found in sugar-free gum) was used as a plasticizer additive is a polyol. This is because sorbitol is a polyol, which is a substance used to modify the properties of polymers. The process of polymer modification involves adding polyols to the polymer matrix, which helps to reduce the glass transition temperature of the polymer. Sorbitol can be used as a plasticizer addictive because it is a natural and non-toxic compound that is biodegradable.

2a. The use of starch-borate and starch-glycerol polymers for the encapsulation of pharmaceutical drugs or pesticides would have a number of beneficial effects. These polymers are natural and non-toxic, and they are biodegradable, which means that they do not pose a risk to the environment. Additionally, they can be used to modify the properties of the drugs or pesticides, making them more effective and reducing their toxicity.

2b. Yes, these polymers are considered to be biodegradable. This is because they are made from natural materials that can be broken down by biological processes. Starch-borate and starch-glycerol polymers are particularly attractive for use in biodegradable materials because they are non-toxic and biocompatible. They can be used in a variety of applications, including packaging materials, agricultural films, and medical devices, where their biodegradability is an important factor.

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To make a 2 M solution, the correct method is to dissolve 1 mole of the compound in 2 L of water. This results in a concentration of 2 moles per liter, which corresponds to a 2 M solution.

The correct option is C.

To make a 2 M (molar) solution of a compound, we need to dissolve an appropriate amount of the compound in a given volume of solvent, typically water, to achieve a concentration of 2 moles per liter.

Molarity (M) is defined as moles of solute per liter of solution. To prepare a 2 M solution, we need a concentration of 2 moles per liter. This means that for every liter of solution, we should have 2 moles of the compound.

Option A suggests dissolving 1 molar mass of the compound in 2 L of water. However, molar mass is not equal to moles. Molar mass represents the mass of one mole of the compound.

Option B suggests dissolving 2 moles of the compound in 1 L of water. This would result in a concentration of 2 moles per liter, which matches the desired 2 M concentration. However, the given option indicates dissolving 2 moles in 1 L, which contradicts the definition of molarity.

Option C suggests dissolving 1 mole of the compound in 2 L of water. This aligns with the definition of molarity, as it gives us a concentration of 1 mole per liter. To achieve the desired 2 M concentration, we would need to double the amount, resulting in 2 moles per liter.

Option D suggests dissolving 2 g of the compound in 1 L of water. This option does not consider the molar mass of the compound and assumes that the molar mass is equal to 2 grams per mole, which is not always the case.

In conclusion, option C is the correct choice for making a 2 M solution, as it involves dissolving 1 mole of the compound in 2 L of water.

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Answer:

1.)In chemistry, an ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding. The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions

2.)Scientific definitions for covalent bond

covalent bond. [ kō-vā′lənt ] A chemical bond formed when electrons are shared between two atoms. Usually each atom contributes one electron to form a pair of electrons that are shared by both atoms. See more at coordinate bond double bond polar bond.

3.)a soft black lustrous form of carbon that conducts electricity and is used in lead pencils and electrolytic anodes, as a lubricant, and as a moderator in nuclear reactors. 2 : a composite material in which carbon fibers are the reinforcing material.

4.)the smallest unit of weight in the avoirdupois, Troy, and apothecaries' systems, based on the average weight of a grain of wheat: in the avoirdupois system it equals 1/7000 of a pound, and in the Troy and apothecaries' systems it equals 1/5760 of a pound. 1 grain is equal to 0.0648 gramAbbreviation: gr.

Answer:

11.2 grams CaO

Explanation:

It appears that substance X may be calcium carbonate:  CaCO3

CaCO3 can be thermally decomposed to CO2 and CaO in the following balanced reaction:

CaCO3(s) ⇒ CaO(s) + CO2(g)     (with applied heat, 840°C)

The molar ratio between the product, CaO, and the reactant, CaCO3, is 1:1.  If we start with 1 mole CaCO3, we should produce 1 mole of CaO.

We have 20.0 grams of substance X, which we'll label CaCO3.  Calculate the moles of CaCO3 by using its molar mass of 100.1 grams/mole.

 20.0 grams/(100.1 grams/mole) = 0.1998 or 0.200 moles of CaCO3.

This should produce, with a molar ratio of 1 to 1, 0.200 moles of CaO

Convert this to grams CaO by multiply by it's molar mass of 56.1 g/mole:

(0.200 moles)*(56.1 g/mole) = 11.2 grams CaO.  Any less, then blame it on your lab partner.  But don't try taking credit if you have more than 11.2 grams.  Scraping debri off the counter into the beaker doesn't count.

Answer:No

Explanation:

Well yes but no, There cant be high tempreture that is 100 degrees and a low tempreture that is 20 degress, there has to be a mid inbetween both, they cant be next to eachother.