The Law Of Conservation of Energy states that ____________.
A. energy cannot be created or destroyed
B. energy that goes into a system never equals energy that goes out
C. both A and B

Answer: 29%

Explanation:

Answer:

b 29 percent

Explanation:

Answer:

H⁺(aq) + H₂O(l) ⇄ H₃O⁺(aq)

Explanation:

According to Brönsted-Lowry acid-base theory, an acid is a substance that donates H⁺. Let's consider the molecular equation showing that benzoic acid is a Brönsted-Lowry acid.

C₆H₅COOH(aq) + H₂O(l) ⇄ C₆H₅COO⁻(aq) + H₃O⁺(aq)

The complete ionic equation includes all the ions and molecular species.

C₆H₅COO⁻(aq) + H⁺(aq) + H₂O(l) ⇄ C₆H₅COO⁻(aq) + H₃O⁺(aq)

The net ionic equation includes only the ions that participate in the reaction and the molecular species.

H⁺(aq) + H₂O(l) ⇄ H₃O⁺(aq)

The mass of the precipitate, CrPO₄ formed when 45.5 mL of 0.300 M Na₃PO₄ react with 42.5mL of 0.200 M Cr(NO3)₃ is 1.25 g

We'll begin by calculating the number of mole of Na₃PO₄ and Cr(NO3)₃ present in the solution.

Molarity of Na₃PO₄ = 0.3 M

Volume = 45.5 mL = 45.5 / 1000 = 0.0455 L

Mole = Molarity × Volume

Mole of Na₃PO₄ = 0.3 × 0.0455

Molarity of Cr(NO3)₃  = 0.2 M

Volume = 42.5 mL = 42.5 / 1000 = 0.0425 L

Mole = Molarity × Volume

Mole of Cr(NO3)₃ = 0.2 × 0.0425

Next, we shall determine the limiting reactant.

Na₃PO₄(aq) + Cr(NO₃)₃(aq) —> CrPO₄(s) + 3NaNO₃(aq)

1 mole       :      1 mole

0.01365    :      0.0085 mole

Thus, Cr(NO₃)₃ is the limiting reactant.

Next, we shall determine the number of mole of CrPO₄ produced from the reaction.

From the balanced equation above,

1 mole of Cr(NO₃)₃ reacted to produce 1 mole of CrPO₄.

Therefore,

0.0085 mole of Cr(NO₃)₃ will also react to produce 0.0085 mole of CrPO₄.

Finally, we shall determine the mass of 0.0085 mole of CrPO₄.

Mole of CrPO₄ = 0.0085 mole

Molar mass of CrPO₄ = 52 + 31 + (16×4)

= 52 + 31 + 64

= 147 g/mol

Mass = mole × molar mass

Mass of CrPO₄ = 0.0085 × 147

Therefore, the mass of the precipitate, CrPO₄ formed is 1.25 g

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To answer the seventh question, we need the specific value of the heat of fusion (Hf) of ice. This information is missing from the given text, so we cannot provide the final answer.

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When glucose molecules are added to chains of glycogen for storage, the process is known as glycogenesis.

The liver and the Cori cycle's resting phases both trigger this process, and insulin's response to high blood glucose levels also triggers it. Blood glucose levels increase after eating because glucose enters the liver. The liver uses glycogenesis to deal with this extra glucose by converting it to glycogen for storage. Glycolysis is the process by which the glucose that is not stored is converted into energy. Each cell in the body experiences this. The first step in the multi-step process of glycogenesis, also known as glycogen synthesis, is the conversion of glucose to glucose-6-phosphate by hexokinase or the liver isoform of hexokinase, known as glucokinase.

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An average brightness was calculated for each length of graphite tested to get a better understanding of the relationship between the length of the graphite and the brightness of the line it produced.

Graphite has many uses in various industries. Some of its uses include: Pencils, Lubricants, Refractories, Batteries, Electrodes, Nuclear reactors, Aerospace industry.

By calculating the average, it is possible to see if there is a trend in the data and if longer or shorter lengths of graphite produce brighter or duller lines. This information can be useful in determining the best length of graphite to use for a particular task or project.

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Answer:

you know that they will be a displacement reaction that will form a barium salt:

Ba(NO3)2+ 2NaCl--> BaCl2 + 2NaNO3

So now that we have that formula and the molecular weight we can determine how much salt will be made. So here we convert the grams to moles

(42.3g Ba(NO3)2)*(1 mole/261.34g) = 0.16185 mol

In the molecular formula we know that 1 mole of Barium nitrate will create 1 mole of Barium chloride, so in this case (in a perfect world) you should get 0.16185 mole of barium chloride (208.23 g/mol) that we then have to convert to grams.

(0.16185 mol BaCl2) * ( 208.23 g/mol) = 33.7037 g of Barium Chloride (rounded to 3 significant digits = 33.7g)

Answer:

nucleus and electron clouds

Explanation:

Ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)) mixture could be a useful buffer in a solution. Option C

A buffer is a solution that can resist changes in pH when small amounts of acid or base are added. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid. The buffer system works by the principle of Le Chatelier's principle, where the equilibrium is shifted to counteract the changes caused by the addition of an acid or a base.

In option A, acetic acid (\(CH_3CO_2H\)) is a weak acid, but hydrochloric acid (HCl) is a strong acid. This combination does not form a buffer because HCl is completely dissociated in water and cannot provide a significant concentration of its conjugate base.

Option B consists of sodium hydroxide (NaOH), which is a strong base, and elemental sodium (Na), which is a metal. This combination does not form a buffer as there is no weak acid-base pair involved.

Option D contains acetic acid (\(CH_3CO_2H\)), a weak acid, and ammonia (\(NH_3\)), a weak base. Although they are weak acid and base, they do not form a buffer system together as they are both weak acids or bases and lack the required conjugate acid-base pair.

Option C, ammonia (\(NH_3\)), is a weak base, and ammonium chloride (\(NH_4Cl\)) is its conjugate acid. This combination can form a buffer system. When ammonia reacts with water, it forms ammonium ions (NH4+) and hydroxide ions (OH-).

The ammonium ions act as the weak acid, while the ammonia acts as the weak base. The addition of a small amount of acid will be counteracted by the ammonium ions, and the addition of a small amount of base will be counteracted by the ammonia, thus maintaining the pH of the solution relatively stable.

Therefore, option C, consisting of ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)), is the suitable mixture that could be a useful buffer in a solution.

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The order of reaction must be determined experimentally or by calculation.

The order of reaction is the power to which a reactant must be raised in the rate law of the reaction. The rate law must be determined experimentally or by calculation. It can not just be deduced from the reaction equation.

In this case, the question is incomplete hence we can not deduce the order of reaction with respect to HCl. However, this order of reaction can be obtained by calculation.

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Answer:

2 HCl + Ba(OH)₂ ⇒ BaCl₂ + 2 H₂O

Explanation:

In a complete neutralization reaction, an acid reacts with a base to form neutral salt and water. To form barium chloride, hydrochloric acid (acid) reacts with barium hydroxide  (base). The balanced chemical equation is:

2 HCl + Ba(OH)₂ ⇒ BaCl₂ + 2 H₂O

Answer:

A

Explanation:

Explanation:

Density is defined as the mass per unit volume of an object.

Density = Mass

Volume

Hope this helps.

Answer:

The master mix contains the following reagents: dNTPs, DNA Polymerase, PCR buffer and MgCl2.

Explanation:

The DNA templates are the gene fragments to amplify by PCR, thereby they have to be added separately in each tube. Moreover, the primer pairs are specific for each gene, thereby they have to be added separately in each tube.  

Deoxynucleotide triphosphates (dNTPs) are the building blocks of the DNA molecules: dGTP, dATP, TTP, and dCTP.

The PCR buffer provides a suitable medium for the activity of the DNA polymerase, often it contains Tris-Hcl and KCl.

MgCl2 is a cofactor for the activity of the DNA Polymerase.

The DNA Polymerase is an enzyme that amplifies DNA by adding nucleotides to the 3' end.

Answer:

50mL

Explanation:

First find out how many moles will be needed in your final solution.

concentration (c) = Moles / Volume of solution (liters)

or rearrange the formula to find your Moles

Moles = concentration    x    volume of solution

convert your mL to L.  1500 mL is the same as 1.5 L

Moles = 0.200 moles/liter   x   1.5 liter (the liters cancel each other out)

Moles = 0.3 moles

Now use the same formula to determine how much of the original solution you need to end up with what you want.

Rearrange the formula again to solve for the volume.

Volume of solution = Moles / concentration

Volume = 0.3 moles / 6.00 (moles/liter)  here the moles cancel out

Volume = 0.05 L

convert your L into mL

Volume = 50 mL

50 mL of 6.00 M HCl are needed to prepare 1500 mL of 0.200 M HCl solution.

HOW TO CALCULATE VOLUME:

C1V1 = C2V2

Where;

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Answer:

Is there a question?

Explanation:

We would need to measure out approximately 44.84 grams of C5Hg to have 0.172 mol.

To determine the grams of C5Hg needed to have 0.172 mol, we need to use the molar mass of C5Hg and the given amount in moles. The molar mass of a compound represents the mass of one mole of that compound.

The molar mass of C5Hg can be calculated by summing the atomic masses of all the atoms in the compound:

C5Hg: (5 * atomic mass of C) + (1 * atomic mass of Hg)

Using the atomic masses from the periodic table:

Atomic mass of C = 12.01 g/mol

Atomic mass of Hg = 200.59 g/mol

Molar mass of C5Hg = (5 * 12.01 g/mol) + (1 * 200.59 g/mol) = 60.05 g/mol + 200.59 g/mol = 260.64 g/mol

Now, we can calculate the grams of C5Hg needed for 0.172 mol using the mole-to-mass conversion:

Grams of C5Hg = Moles of C5Hg * Molar mass of C5Hg

Grams of C5Hg = 0.172 mol * 260.64 g/mol = 44.84 grams (rounded to two decimal places)

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Rutherford's results declined the results of Thomson's model, the correct option is C.

Atomic Models are the scientific theories proposed to determine the structure of an atom.

There are mainly 5 theories proposed for atomic models.

1. John Dalton's Atomic Model: An atom is the basic building block of all physical entities in the universe.

2. Plum Pudding Model, created by J.J. Thomson, uses the comparison of plum pudding, where the positive charge is uniformly dispersed throughout and the negative charge is randomly sprinkled on top, to explain how subatomic particles are structured.

3. Rutherford's model: proved the presence of a nucleus.

4.Niel Bohr's model: Arrangement of electrons in shells.

5. Erwin Schrodinger's model is also called as Quantum Model.

In J.J. Thomson's model, the equal distribution of positive and negative charges is proposed while,

Rutherford's theory declines this arrangement and proposes that the positively charged nucleus occupies a very small part and there is empty space in the atom.

So, Rutherford’s results suggested that the model proposed by Thomson was based on false research and required.

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Answer: 1. I

2. Na

3. F

Explanation:

Ionization energy is the energy required to remove the most loosely bound electron from an isolated gaseous atom.

In a group, the ionization energy decreases as we move down a group as the size increases. The electrons get added to the next shell. Thus the valence electron moves far from the nucleus and thus less energy is required to remove the valence electron.

1. Cl and I: Cl will have larger ionization energy as I lies lower in the group.

2. Na and K : Na will have larger ionization energy as K lies lower in the group

3. F and Br : F will have larger ionization energy as Br lies lower in the group.

Answer:

Genes are segments of deoxyribonucleic acid (DNA) that contain the code for a specific protein that functions in one or more types of cells in the body.

Chromosomes are structures within cells that contain a person's genes. A trait is any gene-determined characteristics and is often determined by more than one gene.

for study island:

A single trait can be controlled by multiple genes.

A single gene can influence multiple traits.

Answer:

Phylum

Explanation:

After that it goes class, order, family, genus, and finally species. In that order, BTW before kingdom is domain.

Answer:

Phylum

Explanation:

chemical energy

i thnk this ithe answer

i hope this calculation will help you  

The manner in which the transfer of energy would be different if the bars were in an open system is as follows: Energy transfer would occur between the copper bars and the surroundings (option B).

The law of conservation of energy principle stating that energy may not be created or destroyed.

An isolated system exchanges neither energy nor matter with the surroundings. According to this question, two copper bars at different temperatures transfer energy until both are at the same temperature.

However, in an open system, some of the energy would be transferred to the surroundings.

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A. The heviest liquid (the one with larger density) will be found at the bottom.

Answer:

Explanation:

b

The answer is A this is a conclusion.

As far as the intelligence of canines, it is widely accepted as a fact that the Border Collie is the most intelligent breed of dog.

The conclusion that border collies are the most intelligent breed of dog is credited to a canine psychologist by the name of Stanley Coren. He studied over 138 recognized breeds of dogs to measure the ease with which they learned new commands and the obedience rate of each breed.

Coren studies the learning and obedience of Border Collies over the course of 199 trials and found that this breed of dog performed 95% better than most other breeds, with only 9 of the 138 breeds studied coming close to the results of the border collie. Easily earning the title of the most intelligent breed of dogs.

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Explanation:

The toxins present are secondary metabolites produced by the fungus. Mushroom poisoning is usually the result of ingestion of wild mushrooms after misidentification of a toxic mushroom as an edible species. ... The safety of eating wild mushrooms may depend on methods of preparation for cooking.

The name of the salt tells us that:

a) there is just one other element combined with the metal by looking at the suffix of the salt's name.

b) the presence of oxygen in a salt can be indicated by the name of the salt.

a) The name of a salt can tell us that there is just one other element combined with the metal by looking at the suffix of the salt's name. If the salt name ends in "-ide," it indicates that the salt is composed of a metal and a single non-metal element.
For example, sodium chloride (NaCl) and potassium bromide (KBr) are salts where the metal (sodium and potassium) is combined with a single non-metal element (chlorine and bromine, respectively). The "-ide" suffix suggests the presence of only one other element in the salt.

b) The presence of oxygen in a salt can be indicated by the name of the salt. If the salt name includes the element oxygen, it suggests that oxygen is present in the salt compound.
For example, sodium carbonate (Na₂CO₃) and calcium sulfate (CaSO₄) contain the element oxygen in their chemical formulas. The presence of oxygen in the salt is implied by the name and the combination of elements in the compound.

Therefore, the name of salt tells us that there is just one other element combined with the metal and there is oxygen present in the salt

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