URGENT !! I'LL GIVE BRAINLIEST IF YOU WANT! 100 POINTS

Which statement is NOT TRUE about molecules and compounds?

A. Compounds are made up of the same type of atom.

B. Molecules are made up of two or more chemically bonded atoms.

C. All molecules and compounds are made of atoms.

D. All compounds are molecules.

The cell notation of the redox reaction between Cu and ClO₃⁻ is:

A voltaic cell or electrochemical cell is a device which produces electricity from chemical reactions occuring within the cell.

The reactions occuring in a voltaic cell are redox reactions.

Oxidation occurs at the anode while reduction occurs at the cathode.

In the given reaction between Cu and ClO₃⁻ as shown below:

Cu is oxidized as follows: 3 Cu (s) → 3 Cu²⁺
ClO₃⁻ is reduced as follows: ClO₃⁻ (aq) → Cl⁻ (aq)

The voltaic cell notation is as follows where Pt is used as an inert electrode in contact with the ClO₃⁻ and Cl⁻:

Therefore, the cell notation of the redox reaction between Cu and ClO₃⁻ shows that Cu is oxidized while ClO₃⁻ is reduced.

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Answer:B

Explanation:

Answer:

Chemical Change

Explanation:

A log is added to a camp fire and is burned. This is an example of a chemical change.

Answer:

negative

Explanation:

The ideal gas law can be used to determine the gas's new pressure. According to the ideal gas law, pressure times volume equals the amount of a gas in moles times the global gas constant times the temperature.

Pressure = (number of moles of gas times the universal gas constant times the temperature) divided by volume is the new equation we may use to calculate pressure.

Since there are an equal amount of moles of gas in this situation, we can use the following formula to determine the new gas pressure: Pressure is equal to (4.3 L times 839.0oC) divided by (766.9 torr times 0.38 L). We obtain a new pressure of 118.6 atm by simplifying.

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The current involved is 44.7 A

In an electrolytic reaction, we have the situation in which one specie is oxidized and the other specie is reduced in the electrochemical reaction. We have the reaction that occurs as;

2Cl^-(aq) ------> Cl2(g) + 2e

Now;

If 2 * 96500 C liberates 22.4 dm^3 of Cl2

x C liberates 20dm³ of chlorine gas at STP

x =  2 * 96500 C *  20dm³/24 dm³

x = 160833.33 C

Now

Q = It

Q = quantity of electricity

I = current

t = time = 1 hour or 3600 s

I = Q/t =  160833.33 C/ 3600 s

I = 44.7 A

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Answer:

Within each group of metals, reactivity increases as you go down the group. The valence electrons are less tightly bound and easier to remove, because they are farther away from the nucleus of the atom. A nonmetal tends to attract additional valence electrons to attain a full valence shell.

Hope it's helpful to you

Answer:

sunglasses

Explanation:

Answer:

First Q :B

Second Q:C

Answer:

https://www.webqc.org/balance.php

Explanation:

this is the website i used to balance all my chem equations

i promise its not a scam its a legit website lol it works rly well

Answer:

see image

Explanation:

let me know if you have any questions

Therefore, the compound that would form a precipitate is option D, NaOH.

A precipitate is a solid that forms from a chemical reaction between two or more liquids or solutions. This solid typically forms when two solutions are mixed together and a chemical reaction occurs that causes one of the products to become insoluble in the mixture, resulting in a solid that falls out of the solution and settles at the bottom. Precipitates can vary in size, shape, and color depending on the specific chemical reaction and the properties of the substances involved.

Here,

To determine which of the given compounds would form a precipitate, we need to know the solubility rules for common ionic compounds. Here are the rules for the given ions:

Li2CO3: carbonates are generally insoluble, but Li2CO3 is an exception and is soluble in water

AgBr: silver halides (AgCl, AgBr, AgI) are generally insoluble, so AgBr would form a precipitate

Cr(NO3)2: nitrates (NO3-) are generally soluble, so Cr(NO3)2 would dissolve in water and not form a precipitate

NaOH: hydroxides (OH-) of Group 1 and most Group 2 metals are soluble, but NaOH is an exception and is only slightly soluble, so it would form a precipitate

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The half-life is a constant property of an isotope and does not change based on the mass or purity of the sample.

The initial half-life of 67Ga is given as 78 hours. This means that after 78 hours, the mass of 67Ga will be reduced to half of its initial value. Gallium-67 (67Ga) is an isotope of gallium with an atomic number of 31 and a half-life of 78 hours. When considering a small mass of 3.2 grams of initially pure 67Ga, the initial half-life (t1/2o) remains the same as the half-life of this particular isotope, which is 78 hours. The half-life is a constant property of an isotope and does not change based on the mass or purity of the sample. When considering a small mass of 3.2 grams of initially pure 67Ga, the initial half-life (t1/2o) remains the same as the half-life of this particular isotope, which is 78 hours.

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The weak bond between the hydrogen atom of one molecule and the nitrogen atom of another molecule, where the two don't actively share an electron, is called hydrogen bond. Option A is correct.

A hydrogen bond is a type of intermolecular attraction that occurs when a hydrogen atom, already covalently bonded to one electronegative atom, interacts with another electronegative atom.

In this case, the hydrogen is bonded to a highly electronegative nitrogen atom, creating a partially positive charge on the hydrogen and a partially negative charge on the nitrogen, allowing for electrostatic attraction between the two molecules.

Hydrogen bonds are relatively weak compared to covalent bonds, but they play a critical role in many biological and chemical processes. For example, hydrogen bonds help hold together the two strands of DNA, which is critical for the proper functioning of genetic information.

Hence, A. is the correct option.

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

"What is the type of weak bond between the hydrogen of one molecule and the nitrogen of another molecule, where the two don't actively share an electron? group of answer choices A) hydrogen bond B) ionic bond C) disulfide bond D) hydrophobic bond E) covalent bond."--

Answer:

isoelectronic pH = 6.003

Explanation:

isoelectronic pH = (pKa1+pKa2)/2

The pressure at which the the gas has a solubility of 2.3 g/L is 93.95 atm

To find the pressure at which the solubility would be 2.3 g/L, we need to use equation for Henry's law, which is written as:

S₁/P₁ = S₂/P₂

Where the variables in that equation are:

We know the values of:

S₁ = 0.086 g/L

P₁ = 3.5 atm

S₂ = 2.3 g/L

Solving the equation for P₂:

S₁/P₁ = S₂/P₂

P₂ = (S₂ * P₁) / S₁

Now evaluate it to get:

P₂ = (2.3 g/L * 3.5 atm) / 0.086 g/L

P₂ = 93.95 atm

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No precipitate will form, as the system is not yet at equilibrium and there is still room for more PbCl2 to dissolve.

To determine if a precipitate will form when mixing the solution, we need to calculate the ion product, Q, and compare it to the solubility product, Ksp.

First, let's write out the balanced equation for the reaction between Pb(NO3)2 and NaCl:

Pb(NO3)2 + 2NaCl → PbCl2 + 2NaNO3

Since we're dealing with a 0.020 M solution of each salt, we can use the concentration and volume to calculate the moles of each ion present:

moles of Pb2+ = (0.020 M) x (0.125 L) = 0.0025 mol
moles of Cl- = 2 x (0.020 M) x (0.075 L) = 0.003 mol

Now we can calculate the ion product, Q:

Q = [Pb2+][Cl-]^2 = (0.0025 M)(0.003 M)^2 = 2.25 x 10^-8

Comparing Q to the Ksp value of 1.6 x 10^-5, we see that Q is less than Ksp, thus no precipitate will be seen.

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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:

Explanation:

Good question!

When you react an acid with a base,the pH of the product is determined by the concentrations of the reactants (the acid and the base)

If both reactants (acid and base) are strong,the pH of the product is 7

If the acid is stronger than the base,the pH of the product will be less than 7

If the base is stronger,the pH of the product will be greater than 7

I hope this helps

Answer:

The correct answer is liquid B.

Explanation:

Latent heat of vaporization also known as the latent heat of evaporation. This latent heat transforms the particles of liquid into a gas without affecting its temperature. For example, the latent heat of evaporation for water is 40.8 kJ per mole, that is, 40.8 kJ per mole of heat is needed to transform water into vapor at 373 K.  

It is known that latent heat of evaporation of a liquid is directly proportional to the cooling effect it generates, that is, more the latent heat of evaporation more will be its cooling effect. Thus, it is clear that liquid B will show the more cooling effect as the latent heat of evaporation of liquid B is more in comparison to liquid A. Thus, more heat will be captivated by liquid B and will generate more cooling effect in comparison to liquid A.  

Answer:

3 exothermic reaction. only that much

Hi,

These are the answers.

• Question 2. C , Substance dissolves

• Question 3. D , Exothermic reaction

• Question 4. C , Endothermic reaction takes place

• Question 5. A , the products formed has more energy than reactants

Hope it helps you... pls mark brainliest if it helped you

Answer:

Battery

Mobile phone

Explanation:

The items that are matter are the battery and the mobile phone.

Matter is anything that has weight and occupies space.

The substance heats up relatively quickly means less energy needed for the rise in temperature. Therefore, the substance is having low specific heat.

Of all liquids, water has the highest specific heat capacity. The amount of heat that one gram of a substance needs either absorb or lose in order to change its temperature by one degree Celsius is known as specific heat. A compound with "low specific heat" will raise its temperature considerably more quickly than a compound with "high specific heat." J/kg C or J/g C are the units for specific heat. While substances with (high or low) particular heats will be more challenging to heat up, substances with (high or low) specific heats will heat up readily.

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A buffer solution is defined as a solution that resists a change in pH when a small amount of acid or base is added to it. the buffer capacity of the solution will prevent the pH from changing too much.

The buffer solution containing nitrous acid, HNO2, and potassium nitrite, KNO2, will experience the following changes when a small amount of HClO4 is added to it: The HClO4 added to the buffer solution will react with the potassium nitrite, KNO2, to form the salt, KClO4.T

he HNO2 will be converted to nitric acid, HNO3, by the HClO4.The HNO3 formed in the previous step will react with the potassium nitrite, KNO2, to form nitric oxide, NO, and potassium nitrate, KNO3.The net effect of adding HClO4 to the buffer solution containing nitrous acid, HNO2, and potassium nitrite, KNO2, will be to shift the buffer solution to a more acidic pH range.

However, the buffer capacity of the solution will prevent the pH from changing too much.

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The mass of one mole of magnesium chloride is 95.21 g/mol.

The mass of one mole of magnesium chloride (MgCl2) can be calculated by adding the atomic masses of one mole of magnesium and two moles of chlorine.

Atomic mass of magnesium = 24.31 g/mol . Atomic mass of chlorine = 35.45 g/mol (because chlorine has two isotopes, the average atomic mass is taken) . Thus, the mass of one mole of magnesium chloride (MgCl2) = 24.31 g/mol + 2(35.45 g/mol) = 24.31 g/mol + 70.90 g/mol = 95.21 g/mol . Therefore, the mass of one mole of magnesium chloride is 95.21 g/mol.

Atomic mass is the amount of matter that makes up an element's atom. The total mass of the protons, neutrons, and electrons that make up an atom is a little bit less than the observable atomic mass.

The average mass of an element's atoms , expressed in  ( amu, commonly known as daltons , D) is the element's atomic mass. The mass of each isotope is multiplied by its abundance to get the atomic mass , which is a weighted average of all the isotopes of that element.

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Answer:

6.02 x 10²³ electrons

Explanation:

Given parameters:

Mass of H₂  = 2g

Unknown:

Number of electrons = ?

Solution:

To find the number of electrons, we must determine the number of moles of H₂ first.

 Number of moles  = \(\frac{mass}{molar mass}\)  

  Molar mass of H₂   = 2(1)  = 2g/mol

Number of moles  = \(\frac{2}{2}\)   = 1mol  

1 mole of a substance contains 6.02 x 10²³ particles

the particles can be protons, neutrons, electrons

So,

  2g of H₂ will contain 6.02 x 10²³ electrons.

Answer:

It's the first answer choice for sulfur and the second answer choice for magnesium I believe