Which of her notes listed indicates a chemical property of calcium chloride (Ca Cl2)?

1. 76.69 • 10^12

2. 0.69 • 10^5

Scientific notation is used by scientists and mathematicians when numbers are too small or large to be written out in full.

Correct Scientific Notation

When writing a number in scientific notation, there are 2 steps. First, move the decimal point in the number so that there is exactly one natural number before the decimal.

This means that the number must be between 1 and 10 to be in scientific notation.

Next, multiply the new decimal by 10 raised to some power. The power should be equivalent to the number of times the decimal point was moved. If the decimal point was moved to the left (the original number was large), then the power should be positive. If the decimal was moved the to right (the original number was small), then the power should be negative.

Incorrect Scientific Notation

If the steps above are not done correctly, the answer will not be in scientific notation. For this question, only the first step is important. Answer choice 1 has 2 natural numbers before the decimal point, so it is incorrect.

Answer choice 2 has no natural numbers before the decimal point so it is also incorrect.

Neither answer choice is between 1 and 10.

Examples

We can look at 2 examples of correct scientific notation.

First, move the decimal 7 places to the right.

Now, multiply it by 10 to the 7th power because the decimal was moved 7 times. Also, 7 should be negative because the decimal was moved to the right.

Additionally, we look at an example with a larger number

Once again, move the decimal point 7 places to the left

Finally, multiply it by 10 to the 7th power, but it should be positive this time.

Answer:

Acidic

Explanation:

the pH scale ranges from 0 to 14, where 7 means the substance is neutral. Less than 7 means the substance is Acidic. Greater than 7 means the substance is Basic.

Remember that the lower the pH is, the more Acidic the substance is. In this case lemon juice is Acidic.

Answer:

    The blood circulatory system (cardiovascular system) delivers nutrients and oxygen to all cells in the body. It consists of the heart and the blood vessels running through the entire body. The arteries carry blood away from the heart; the veins carry it back to the heart.

Explanation:

You're welcome!

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The mixture of sodium chloride and broken glasses can be separated by dissolution, filtration, and evaporation respectively.

The mixture containing sodium chloride and broken glasses can be separated as follos:

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Answer:

Yes

Explanation:

The salt increases the boiling point, meaning it make water boil at a higher temperature, and it decreases the specific heat capacity, meaning it will heat up quick.

Taking into account the reaction stoichiometry and limiting reagent, 9 grams of NO can be produced from 12 g of NH₃ and 12 g of O₂.

In first place, the balanced reaction is:

4 NH₃ + 5 O₂ → 4 NO + 6 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 68 grams of NH₃ reacts with 160 grams of O₂, 12 grams of NH₃ reacts with how much mass of O₂?

\(mass of O_{2} =\frac{12 grams of NH_{3}X160 grams of O_{2} }{68 grams of NH_{3}}\)

mass of O₂= 28.23 grams

But 28.23 grams of O₂ are not available, 12 grams are available. Since you have less mass than you need to react with 12 grams of NH₃, O₂ will be the limiting reagent.

Considering the limiting reagent, he following rule of three can be applied: if by reaction stoichiometry 160 grams of O₂ form 120 grams of NO, 12 of O₂ form how much mass of NO?

\(mass of NO=\frac{12 grams of O_{2} x120 grams of NO}{160 grams of O_{2}}\)

mass of NO= 9 grams

Then, 9 grams of NO can be produced from 12 g of NH₃ and 12 g of O₂.

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Answer:

Probably around 6 because the ph of hydrochloric acid is 3

Explanation:

What happens during a fission reaction is that matter is converted to energy.

We define the term fission as the kind of reaction that involves the breaking of the nucleus of an atom and then there would be a release of energy. There are various kinds of nuclear reactions that we have but the most common types of nuclear reactions are the fission and the fusion reaction.

In the fusion reaction we have the combination of two or more lighter nucleus so as to produce a heavier nucleus while in the case of the fission reaction the nucleus would have to be  broken up so that energy can be released in the process.

Thus, we see that the total mass on the left hand side may not be the same as the total mass on the left hand side because some of the mas is converted to energy.

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Missing parts;

Which change occurs during a nuclear fission reaction?

(1) Covalent bonds are converted to ionic bonds.

(2) Isotopes are converted to isomers.

(3) Temperature is converted to mass.

(4) Matter is converted to energy

Answer:

10250.8

Explanation:

Formula

multiply the energy value by 4184

Answer:

if my calculation are correct, it's 295 grams

Explanation:

because liters converted to grams is .1=100 so if you take 2.95 times 100, it equals 295

Answer:

Viscosity because the rest are different

The given statement, "the pentose phosphate pathway can be characterized as an anabolic pathway" is true.

The pentose phosphate pathway, also known as the phosphogluconate pathway or hexose monophosphate shunt, is an important metabolic pathway that functions alongside glycolysis, the citric acid cycle, and oxidative phosphorylation, among others, to produce energy in the form of ATP or NADPH for a variety of cellular processes.

The pentose phosphate pathway plays an essential role in anabolic reactions, including DNA and RNA synthesis, as well as the synthesis of NADPH, an essential cofactor for biosynthesis reactions. In addition, the pathway is crucial for antioxidant protection, as it helps to prevent oxidative stress by producing NADPH, which is used to regenerate glutathione, a potent antioxidant.

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Answer:

1) Heterogeneous mixture

2). homogeneous mixture

3) water is solvent and sugar is solute

4). sublimation process

heterogeneous

homogeneous

sugar is solvent and water is solute

???

The substance that will increase the molar solubility of nickel(II) phosphate in a saturated solution is c. Na3PO4 (sodium phosphate).

To determine the substance that will increase the molar solubility of nickel(II) phosphate, we need to consider the common ion effect and the solubility product principle.

Nickel(II) phosphate has a chemical formula of Ni3(PO4)2, and its solubility can be affected by the presence of other ions in solution. In this case, we are looking for a substance that will introduce an ion that can form a more soluble compound with one of the ions in nickel(II) phosphate.

Among the given substances, Na3PO4 is the only one that introduces an ion (PO4^3-) that can form a more soluble compound with one of the ions in nickel(II) phosphate. When sodium phosphate is added to a saturated solution of nickel(II) phosphate, the PO4^3- ions will combine with the Ni^2+ ions to form the more soluble compound sodium nickel phosphate (Na2Ni(PO4)2).

The other substances (a. (NH4)3PO4, b. NH4Cl, d. KOH, and e. HNO3) do not introduce ions that can form more soluble compounds with the ions in nickel(II) phosphate. Therefore, they will not increase the molar solubility of nickel(II) phosphate.

Among the given substances, sodium phosphate (Na3PO4) is the only one that will increase the molar solubility of nickel(II) phosphate in a saturated solution.

Sodium phosphate introduces PO4^3- ions, which can combine with the Ni^2+ ions to form a more soluble compound. The other substances do not have ions that can form more soluble compounds with nickel(II) phosphate.

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Based on the stoichiometry of the reaction, If the mass of sodium azide used was far greater than 1424 g, the volume of nitrogen gas produced will be far greater than 736 L.

However, If the mass of sodium azide used was far less than 1424 g, the volume of nitrogen gas produced will be far less than 736 L.

Sodium azide is the chemical found in automobile airbags.

Automotive air bags inflate when an electrical charge triggered by automobile impact causes sodium azide, NaN3, to rapidly decompose to its component elements, nitrogen gas and sodium

The equation of the reaction is given below:

According to the equation of reaction, 2 moles of sodium azide produces 3 moles of nitrogen gas.

1 mole of Nitrogen gas has a volume of 22.4 L

Molar mass of sodium azide is 65 g

Moles of sodium azide in 1424 g = 1424/65 = 21.9077 moles

21.9077 moles of sodium azide will produce 21.9077 * 3/2 moles of nitrogen gas = 32.86 moles of nitrogen gas

32.86 moles of nitrogen gas will occupy a volume of 32.86 * 22.4 = 736 L

If the mass of sodium azide used was far greater than 1424 g, the volume of nitrogen gas produced will be far greater than 736 L.

If the mass of sodium azide used was far less than 1424 g, the volume of nitrogen gas produced will be far less than 736 L.

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Answer: Magnesium loses two electrons whilst sulfur gains tw

Answer:

Explanation:

a substance's enthalpy of fusion tells you how much heat is needed in order to convert

1 g

of said substance from solid at its melting point to liquid at its melting point.

In water's case, an enthalpy of fusion equal to

333.55 J g

−

1

tells you that

1 g

of ice at

0

∘

C

can be converted to

1 g

of liquid water at

0

∘

C

by supplying

333.55 J

of heat.

Your ice cube has a mass of

55.0 g

, which means that it will require

55.0

g

⋅

=

Δ

H

fus



333.55 J

1

g

=

18,345.25 J

Rounded to three sig figs, the number of sig figs you have for the mass of the ice cube, the answer will be

heat needed

=

∣

∣

∣

∣

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

a

a

18,300 J

a

a

∣

∣

−−−−−−−−−−

Answer:

Explanation:

As the distance to the outermost electron of the Group 1 element increases, the amount of energy required to remove an electron decreases.

That's D

A: and C: are both incorrect for the same reason. Group 1 elements don't add electrons -- they try and give those electrons away.

B: all of the group one have only 1 valence electron,

The negative enthalpy of the production of xenon fluorides causes their instability. This statement is false.

Enthalpy of formation refers to the change in enthalpy when one mole of a compound is formed from its constituent elements in their standard states. Negative enthalpy of formation indicates an exothermic reaction, where energy is released during the formation of the compound.

Xenon fluorides, such as xenon hexafluoride and xenon tetrafluoride, are indeed highly reactive and unstable compounds. Their instability is primarily attributed to the presence of strong Xenon-Fluorine bonds, which make these compounds highly reactive and prone to decomposition. The high electronegativity difference between xenon and fluorine leads to the formation of polar covalent bonds, resulting in a high degree of ionic character.

The high reactivity and instability of xenon fluorides arise from the large size of xenon atoms, making them susceptible to steric strain. The repulsion between the fluorine atoms surrounding the central xenon atom can cause structural instability and result in decomposition or violent reactions.

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Answer:

To determine the number of atoms in 0.28 moles of Beryllium (Be), we need to use Avogadro's number, which is 6.022 x 10^23 atoms per mole.

First, we can calculate the number of moles of Beryllium (Be) in 0.28 moles by multiplying it by Avogadro's number:

0.28 moles x 6.022 x 10^23 atoms/mole = 1.68496 x 10^23 atoms

Therefore, there are approximately 1.68 x 10^23 atoms in 0.28 moles of Beryllium (Be).

Explanation:

Answer:

765 g Co(NH₃)₆Cl₃

General Formulas and Concepts:

Explanation:

Step 1: Define

2.86 mol Co(NH₃)₆Cl₃

Step 2: Define conversions

Molar Mass of Co - 58.93 g/mol

Molar Mass of N - 14.01 g/mol

Molar Mass of H - 1.01 g/mol

Molar Mass of Cl - 35.45 g/mol

Molar Mass of Co(NH₃)₆Cl₃ - 58.93 + 6(14.01) + 18(1.01) + 3(35.45) = 267.52 g/mol

Step 3: Dimensional Analysis

\(2.86 \ mol \ Co(NH_3)_6Cl_3(\frac{267.52 \ g \ Co(NH_3)_6Cl_3}{1 \ mol \ Co(NH_3)_6Cl_3} )\) = 765.107 g Co(NH₃)₆Cl₃

Step 4: Simplify

We are given 3 sig figs. Follow sig fig rules.

765.107 g Co(NH₃)₆Cl₃ ≈ 765 g Co(NH₃)₆Cl₃

Solubility rules are used to predict the outcome of precipitation reactions, which involve the formation of insoluble products.

Solubility rules are guidelines that help predict the solubility of different compounds in water. These rules are based on the general principles of ionic interactions and the solubility of common ionic compounds. When two soluble compounds are mixed together, a precipitation reaction may occur if the resulting compound formed is insoluble in water.

In precipitation reactions, the reactants are typically aqueous solutions of two different compounds. The solubility rules are used to determine if a precipitate will form by identifying the combination of ions that can form an insoluble compound. The rules state that certain combinations of ions will result in the formation of insoluble products, while others will remain soluble in water.

In conclusion, solubility rules are used to predict precipitation reactions, which involve the formation of insoluble products. These rules help determine whether certain combinations of ions will result in the formation of a precipitate or if the compounds will remain soluble in water. By understanding the solubility properties of different ions, scientists and chemists can predict the outcome of chemical reactions and better understand the behavior of substances in solution.

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Elements in the same group have the same valence electron configuration.

The best explanation for the observation that elements in the same group of the periodic table often exhibit similar chemical reactivity is that they have the same valence electron configuration.

The chemical behavior of an element is primarily determined by the arrangement and number of electrons in its outermost energy level, known as the valence electrons.

Elements in the same group have similar valence electron configurations because they have the same number of valence electrons.

Valence electrons are responsible for forming chemical bonds and participating in chemical reactions.

Elements with the same valence electron configuration tend to have similar chemical properties because they have similar tendencies to gain, lose, or share electrons to achieve a stable electron configuration.

For example, elements in Group 1 (such as lithium, sodium, and potassium) all have one valence electron in their outermost energy level.

As a result, they exhibit similar reactivity, readily losing that one valence electron to form a +1 ion.

In contrast, elements in Group 17 (such as fluorine, chlorine, and bromine) have seven valence electrons. They tend to gain one electron to achieve a stable electron configuration of eight electrons, forming -1 ions.

In summary, the similar chemical reactivity observed among elements in the same group of the periodic table can be attributed to their having the same valence electron configuration, which influences their ability to form chemical bonds and participate in reactions.

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The right response is d. Both enzymes will have the same ΔG for catalysis.

The reaction rate and equilibrium constant have an impact on the Gibbs free energy (ΔG). No matter the source of the enzyme, such as E. coli or a thermophilic microbe, the ΔG for a reaction is the same. As a result, both enzymes will have the same ΔG for sucrose hydrolysis.

The ΔG may be written mathematically as:

ΔG = -RT ln (K)

T is the temperature, K is the equilibrium constant, and R is the gas constant..

As both enzymes have the same reaction rate (K) and temperature (T), the reaction's ΔG  value will likewise be the same.

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Histone acetyltransferases (HATs) are enzymes that convert acetyl groups from acetyl-CoA to -N -acetyl lysine to acetylate conserved lysine amino acids on histone proteins.

What are Histone acetyltransferases?

Histone acetyltransferases (HATs) are enzymes that transfer an acetyl group from acetyl-CoA to create -N-acetyllysine in order to acetylate conserved lysine amino acids on histone proteins. Histones are wrapped around DNA, and genes can be activated and deactivated by adding an acetyl group to the histones. Gene expression is generally increased by histone acetylation. Histone acetylation is typically related to euchromatin and associated with transcriptional activity. Euchromatin's less compact structure makes it easier for transcription factors to attach to DNA's regulatory regions, activating transcription. The original theory postulated that acetylation of lysine neutralises the positive charge ordinarily present, lowering the binding between histone and (negatively charged) DNA and making DNA more accessible to transcription factors.

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(a) To get the pH of the media to 5.8, you would add NaOH solution. NaOH is used as a basic solution, and when it is added to a solution, it will increase the pH of the solution.

(b) The molecular weight of BA is 225.3. To prepare a 1M solution, you would have to weigh out 225.3 grams of BA.(c) To convert a 1M solution of BA to mg/mL, you can use the following equation: 1 mole = molecular weight in grams; 1000 millimoles = 1 mole. So, 1 M = 1000 mg/mL. Therefore, a 1M solution of BA is equivalent to 1000 mg/mL .(d) To convert a concentration of 1000 mg/mL .

Therefore, to calculate the weight required for a 5 mM solution, use the following formula :Mass of BA = molarity × volume × molecular weight= 5 × 0.001 × 225.3= 1.1265 grams(f) To convert a concentration of 5 mM to mg/mL, we use the following formula: Concentration (mg/mL) = (Concentration (mM) × Molecular weight) / 1000= (5 × 225.3) / 1000= 1.1265 mg/mL(g)

To convert a concentration of 1.1265 mg/mL to mg/L, we multiply by 1000, so 1.1265 mg/mL = 1126.5 mg/L.(h) Given that the stock solution of BA is 5 mM and the working solution is 0.2 mg/mL.

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Answer:

b a c a b

Explanation: