between 7.35 and 7.45, Which of the following best describes human

blood

Answer:

2,3-dimethylheptane.

CH₃ - CH - CH-CH₂-CH₂-CH₂-CH₂

           |        |

       CH₃    CH₃

Explanation:

Hello there!

In this case, according to the given instructions, it is possible to draw the organic chemical structure by connecting seven carbon atoms along the parent chain with two methyl substituents at the second and third carbon atoms; thus, the resulting structure is:

CH₃ - CH - CH-CH₂-CH₂-CH₂-CH₂

           |        |

       CH₃    CH₃

Furthermore, the name would be 2,3-dimethylheptane according to the IUPAC rules for nomenclature.

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0.25 mole of hydrogen contains 1.5 * 10^23 molecules  of hydrogen gas.

We have to know that the number of molecules in one mole of a substance is obtained from the Avogadro's number.

We know that;

1 mole of hydrogen contains 6.02 × 10^23 molecules of hydrogen

0.25 mole of hydrogen contains 0.25 mole × 6.02 × 10^23 molecules/1 mole

= 1.5 * 10^23 molecules

Therefore, 0.25 mole of hydrogen contains 1.5 * 10^23 molecules  of hydrogen gas.

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Answer:

A. It is exothermic

Explanation:

This reaction of acid and base represents synthesis reaction because new subsatnces are produced.

Synthesis reactions are reactions that occur when two different atoms combines to form a different molecule. A synthesis reaction can be represented by the equation i.e. A + B → C. In this equation, the A and B represent the reactants whereas the C represents the product.

So we can conclude that option C is the correct answer which is the synthesis reaction.

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Answer:

[IBr] = 0.049 M.

Explanation:

Hello there!

In this case, according to the balanced chemical reaction:

[tex]I_2+Br_2\rightarrow 2IBr[/tex]

It is possible to set up the following equilibrium expression:

[tex]K=\frac{[IBr]^2}{[I_2][Br_2]} =0.0110[/tex]

Whereas the the initial concentrations of both iodine and bromine are 0.50 M; and in terms of [tex]x[/tex] (reaction extent) would be:

[tex]0.0110=\frac{(2x)^2}{(0.50-x)^2}[/tex]

Which can be solved for [tex]x[/tex] to obtain two possible results:

[tex]x_1=-0.0277M\\\\x_2=0.0245M[/tex]

Whereas the correct result is 0.0245 M since negative results does not make any sense. Thus, the concentration of the product turns out:

[tex][IBr]=2x=2*0.0249M=0.049M[/tex]

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Answer:

It is photosynthesis and transpiration

hope it helps

Explanation:

protons, neutrons and electrons

Answer:

An atom contains protons, neutrons and electrons BUT A NUCLEUS CONTAINS PROTONS AND NEUTRONS ONLY.

Answer:

17. transformational energy

6.26 g C

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[Given] 3.14 × 10²³ atoms C

[Solve] grams C

Step 2: Identify Conversions

Avogadro's Number

[PT] Molar Mass of C - 12.01 g/mol

Step 3: Convert

Step 4: Check

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

6.26227 g C ≈ 6.26 g C

Answer:

Sand (SiO2 silica) In its pure form it exists as a polymer, (SiO2)n.

Soda ash (sodium carbonate Na2CO3) ...

Limestone (calcium carbonate or CaCo3) or dolomite (MgCO3)

Explanation:

I am pretty sure you know what sand is, Soda ash is a fine white colored powder that is extracted from the ashes of plants growing in sodium rich soils. Limestone is is a common type of carbonate sedimentary rock.  

Answer:

I am not sure but i think it is 5 grams

Explanation:

because the total mass= 5g

so it is a physical change so no new substance is formed

so the total mass = total mass of all the broken pieces

Translation is the conversion of RNA to protein. The conversion of RNA to DNA is called reverse transcription.

Proteins may be defined as natural-appearing, extremely complex substances that consist of amino acid residues joined by peptide bonds.

The process of translation occurs in the cytoplasm of the cells, while the process of transcription occurs in the nucleus itself.

The conversion of DNA to RNA is called transcription. While the proteins are never directly converted from DNA, it involves both processes of transcription followed by the translation.

Therefore, translation is the conversion of RNA to protein.

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Answer:

False

Explanation:

. What you’re describing is a displacement reaction.

Answer:

False, that is a single replacement reaction that you have described.

Explanation:

Answer:

436.88 moles of P₄O₁₀

Explanation:

From the question given above, the following data were obtained:

Number of molecules of P₄O₁₀ = 2.63×10²⁶ molecules​

Number of mole of P₄O₁₀ =?

From Avogadro's hypothesis,

6.02×10²³ molecules = 1 mole of P₄O₁₀

Therefore,

2.63×10²⁶ molecules​ = 2.63×10²⁶/6.02×10²³

2.63×10²⁶ molecules​ = 436.88 moles of P₄O₁₀

Thus, 436.88 moles of P₄O₁₀ are present in 2.63×10²⁶ molecules.

Yes. Light from the sun can pull energy out of the ink, causing it to become visible

___________________________________

Sorry if wrong

Answer:

Hey mate.......

Explanation:

This is ur answer......

Metals are an excellent conductor of electricity and heat because the atoms in the metals form a matrix through which outer electrons can move freely. Instead of orbiting their respective atoms, they form a sea of electrons that surround the positive nuclei of the interacting metal ions.

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Answer: unlike, will not scatter

Explanation:

Colloids are unlike solutions because their dispersed particles are much larger than those of a solution. The dispersed particles of a colloid cannot be separated by filtration, but they scatter light, a phenomenon called the Tyndall effect.

Answer:

B

Explanation:

Answer:

A) Less amount of NaOH will be required

B) Reliability decreases with increase in concentration of NaOH solution

C) Mass of NaOH = 0.223 g

D) Number of hydroxide ions = 3.36 × 102²¹

E)Moles of H₂SO₄ neutralized = 0.00279 moles of H₂SO₄

Explanation:

A) Since the number of moles of acetic acid in the vinegar sample is constant, the number of moles of NaOH reacting with acetic acid is constant as well.

Volume = number of moles / concentration

Assuming, number of moles = 1, concentration = 0.1 M

Volume = 1/0.1 = 10

With increase in concentration,

Volume = 1/0.5 = 2

Therefore, less amount of NaOH will be required

B) An increase in concentration of base added will results in lesser volume of based used. This will result in an increase in percentage error as well as decrease innthe accuracy of determining the endpoint. Hence, reliability decreases

C) mass = concentration × volume × molar mass

Molar mass of NaOH = 40.0 g, volume of NaOH = 23.46 mL = 0.02346 L, concentration = 0.238 M

Mass of NaOH = 0.238 × 0.02346 × 40

Mass of NaOH = 0.223 g

D) number of moles of NaOH in 0.223 g = 0.233/40 = 0.00558 moles

1 mole of NaOH produces 1 mole of hydroxide ions; 0.00558 moles of NaOH will produce 0.00558 moles of hydroxide ions

Number of hydroxide ions in 0.00558 moles = 0.00558 × 6.02 × 10²³

Number of hydroxide ions = 3.36 × 102²¹

E) H₂SO₄ + 2 NaOH ----> Na₂SO₄ + 2 H₂O

1 mole of H₂SO₄ requires 2 moles of NaOH for complete neutralization

There are 0.00558 moles of NaOH in 23.46 mL of 0.238 M NaOH solution.

Moles of H₂SO₄ required to neutralize 0.00558 moles of NaOH = 0.00558/2

Moles of H₂SO₄ neutralized = 0.00279 moles of H₂SO₄

Answer: b. 0.089

Explanation: The Law of Conservation of Mass states that when in a chemical or physical change, the products' mass of a chemical reaction will equal to the mass of the reactants' mass or in other words, mass cannot be created or destroyed.

The same can be said to moles, since, they are also measures of mass.

In the reaction:

[tex]CH_{3}CN_{(g)} \rightarrow CH_{3}NC_{(g)}[/tex]

initially there were 0.200 mol of reactant. After 25 min, there are 0.111 mol left.

This means that 0.089 mol of reactant "transformed" into product.

Therefore, in the reaction vessel, there are 0.089 mol of product.

Answer:

letter C I'm not sure to my answer but hope it can hrlp

The reason why magnesium hydroxide is  less basic than a saturated solution of potassium hydroxide is that magnesium hydroxide is less soluble than potassium hydroxide.

A saturated solution is one that contains as much solute as it can normally hold at a particular temperature.

We know that magnesium hydroxide is less soluble than potassium hydroxide. Hence, the reason why magnesium hydroxide is  less basic than a saturated solution of potassium hydroxide is that magnesium hydroxide is less soluble than potassium hydroxide.

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Answer:

Given:

Compound C8H18

mass of compound- 546.23 gram

To find:

number of moles =?

Solution:

let's find out the molar mass of C8H18= 12×8+18×1 = 114 gram/mole

Number of moles= given mass/molar mass

=546.23/114

= 4.7818436487 moles.

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Answer:

Equilibrium is shifted to left.

Increase in temperature favours the endothermic reaction. In the given reaction, the backward reaction is an endothermic reaction. So the backward reaction is favoured, so the equilibrium shifts towards left.

The answer is C.

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it is b shared to form a covalent bond

Explanation:

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

Answer:

The answer is D

Explanation:

The hornwort is telling what that exact plant does and the kangaroo paw is telling what they do physically to hold onto water

The first adaptation is to the life cycle, and the second is to the physical traits thus, the kangaroo paw describes what they physically do to hold onto water, and the hornwort describes what that particular plant performs. So, the correct option is D.

A species or organism gradually grows more accustomed to its surroundings through the process of adaptation. The behavioral or physical characteristics of an animal that improve its ability to thrive in its ecosystem are referred to as adaptation. Animals can adapt by changing how they look to hide from predators (camouflage). To survive in their habitats, different species have evolved various adaptations.

In the above given example, the life cycle is the first adaptation, and the physical characteristics are the second. Therefore, the hornwort defines what that particular plant does, and the kangaroo paw represents what they physically do to hold onto water.

Therefore, the correct option is D.

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