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Question 13 (1 point)

The Cambrian saw a tremendous diversification in life forms in part because_____.

Answer:

a vanilla milkshake

Explanation:

a homogeneous mixture is a mixture that is equal in all parts. a tossed salad may have some parts with more lettuce. a chocolate chip cookie might have more chocolate chips in one area. and chunky peanut butter is really chunky.

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Answer:chlorophyll

Explanation:

The part of leaves that is responsible for absorbing sun's energy is chloroplast.

A chloroplast is an organelle found within the cells of plants and certain algae that is responsible for photosynthesis, which is the process by which solar energy is converted into chemical energy for growth.

Small organelles called chloroplasts are found inside plant cells and store sunlight energy.

The chloroplast's thylakoid membranes contain a light-absorbing pigment called chlorophyll, which is responsible for the plant's green color.

They are in charge of photosynthesis, which is the process of converting light energy into sugar and other organic molecules that plants and algae use as food.

They also produce amino acids and lipids, which are required for the production of chloroplast membranes.

Thus, the chloroplast is the part that traps the energy of the Sun.

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Answer:

14.9 mol

Explanation:

To find the number of moles in a given mass of a sample of sodium chloride (NaCl), we can multiply the number of grams in the sample by the molar mass of sodium chloride, which is 58.44 g/mol.

871 g × (1 mol / 58.44 g)

= 871/58.44 mol

≈ 14.9 mol

Note that we rounded to 3 significant figures in the final answer because that is how many significant figures were given in the mass measurement of the sodium chloride sample.

Answer:

I t transfers from the ocean to the air, however the current is not as warm so less energy will transfer from the current to the air making ChrisstChurch cooler than usual.

1.06g

Please refer to the image attached.

You first find the number of moles (n) for KClO3 as you have been given the mass. So n = mass/Mr gives you the moles that is 0.022 mol

Next you use the ratio 2:3 as per the equation where it's 2KClO3 ---> 3O2 so you just cross multiply and get the moles for oxygen.

Now that you know the number of moles for oxygen, you can use the same moles equation that you used earlier to find the mass. mass=n×Mr and so you get the answer as 1.06g of oxygen.

Initially, clean the surface, Isopropyl alcohol (IPA) and water used in a 50:50 ratio will usually work well to scrub away most stains. While water will eliminate dirt and collected dust, alcohol will dissolve light oil.

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The gas pressure after compression will be 6.76 atm.

Assuming that number of moles of gas as well as the temperature remain constant during compression, the gas pressure after compression can be calculated as follows:

Given

Pressure = 1.43 atm

Volume = 7.7 L

Volume after compression = 1.64 L

V2 = (nRT) / 1.64 L P2 = (nRT)

P2 denotes the pressure after compression, and V2 denotes the volume after compression. To find P2, we must enter the following values into the equation:

6.76 atm = (1.43 atm x 7.7 L) / 1.64 L

As a result, the gas pressure after compression will be 6.76 atm.

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Answer:

LI

Explanation:

Answer:

Percent yield = 66.7%

Explanation:

Percent yield is a way to determine the efficiency of a reaction. Is widely used in organic chemistry. The formula is:

Percent yield = Actual yield / Theoretical yield * 100

In the problem, the actual yield obtained was 60g and theoretical yield is 90g. Replacing:

Percent yield = 60g / 90g * 100

Upon addition of iron, the equilibrium will shift toward forward according to Le Chatelier’s principle in the reaction 4 Fe (s) + 3 O\(_2\) (g) →2 Fe\(_2\)O\(_3\) (S)

Equilibrium is commonly characterized as a condition of rest in which no change occurs. A body in equilibrium will have no negative or positive energy exchanges.

The equilibrium state is defined differently in biology, physics, and chemistry. However, the underlying principle remains the same. External forces will have little effect on an organism that is in balance. Upon addition of iron, the equilibrium will shift toward forward according to Le Chatelier’s principle in the reaction 4 Fe (s) + 3 O\(_2\) (g) →2 Fe\(_2\)O\(_3\) (S)

Therefore, upon addition of iron, the equilibrium will shift towards forward according to Le Chatelier’s principle.

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Answer:If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid. The most energetic particles at the surface escape from the surface of the liquid as a vapour as it gets warmer. Liquids evaporate faster as they heat up and more particles have enough energy to break away.

Explanation:

Fe(OH)₂(s) + O₂(g) +OH → Fe(OH)₃(s) + H₂O balance in basic solution is 4Fe(OH)₂ (s) + O₂(g) + 2H₂O → 4Fe(OH)₃(s)

A basic solution is an aqueous solution containing more OH⁻ ions than H⁺ ion

The unbalanced redox equation is as follows:

Fe(OH)₂(s) + O₂(g) +OH → Fe(OH)₃(s) + H₂O

In the chemical reaction all atoms other than hydrogen and oxygen are balanced and the oxidation number of fe changes from 2 to 3 and the change in the oxidation number is 1 and the oxidation number of fe changes from 0 to -2 and for 2O atoms the change in the oxidation number is 4 and then balance the equation with increase in the oxidation number and with decrease in the oxidation number

Fe(OH)₂(s) and Fe(OH)₃(s) with 4 then,

4Fe(OH)₂(s)+O₂(g) → 4Fe(OH)₃(s)

To balance O atoms, add 2 water molecules on LHS,

4Fe(OH)₂ (s) + O₂(g) + 2H₂O → 4Fe(OH)₃(s)

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The physical and chemical properties of seawater vary according to latitude, depth, nearness to land, and input of fresh water. The physical and chemical properties of seawater have a great effect on organisms, varying especially with the size of the creature. Marine organisms have evolved a wide variety of unique physiological and morphological features that allow them to live in the sea.

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Conversion factor used to convert volume is 1L = 1000 mL.

15.43L = 15430mL

The same attribute is expressed using a unit conversion but in a different unit of measurement. For instance, time can be expressed in minutes rather than hours, and distance can be expressed in kilometers, feet, or any other measurement unit instead of miles. Measurements are frequently offered in one set of units, like feet, but are required in another set, like chains. A conversion factor is a mathematical equation that facilitates an equal exchange of feet for chains.

A conversion factor is a number that is used to multiply or divide one set of units into another. If a conversion is required, it must be done using the correct conversion factor to get an identical value.

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Answer:

Explanation:

C₁₂H₂₂O₁₁

1 )

Molar mass = 12 x 12 + 22 x 1 + 11 x 16

= 144 + 22 + 176

= 342 g

2 )

100 mL of 1.0 M will contain 1.0 x0.100 = .1 mole of sucrose

0.1 mole of sucrose = 0.1 x 342 g = 34.2 g of sucrose.

So , mass of sucrose required is 34.2 g .

3 )

100 mL of .5 M sucrose = .100 x .5 mole of sucrose

= .05 mole of sucrose

.05 mole of sucrose = .05 x 342 g = 17.1 g of sucrose .

So , mass of sucrose required is 17.1 g .

Answer:

false

Explanation:

Denitrifying bacteria and nitrogen-fixing bacteria perform opposite processes in the nitrogen cycle. Nitrogen-fixing bacteria convert atmospheric nitrogen into usable forms such as ammonia, while denitrifying bacteria convert nitrates in the soil back into atmospheric nitrogen

Answer:

A. 2.5 x 10^M

Explanation:

H+=10^-pH

- Hope that helps! Please let me know if you need further explanation.

Answer:

A. 2.5 x 10^M

Explanation:

i took the test and i got it correct (edmentum)

Approximately 70.57 mL of 1.00 M NaOH should be added to 250 mL of 0.50 M CH3CO₂H to produce a buffer with a pH of 4.50.

To determine the volume of 1.00 M NaOH required to produce a buffer with a pH of 4.50 when added to 250 mL of 0.50 M CH3CO₂H, we need to consider the Henderson-Hasselbalch equation and the stoichiometry of the reaction.

The Henderson-Hasselbalch equation for a buffer solution is given as:

pH = pKa + log([A-]/[HA])

In this case, CH3CO₂H (acetic acid) acts as the weak acid (HA) and CH3COO- (acetate ion) acts as its conjugate base (A-). We are given that the desired pH is 4.50, and we can determine the pKa value for acetic acid from reference sources, which is approximately 4.75.

Using the Henderson-Hasselbalch equation, we can rearrange it to solve for the ratio [A-]/[HA]:

[A-]/[HA] = 10^(pH - pKa)

[A-]/[HA] = 10^(4.50 - 4.75) = 10^(-0.25) = 0.5623

This means that the ratio of the acetate ion to acetic acid in the buffer solution should be approximately 0.5623.

To calculate the required volume of NaOH, we need to consider the stoichiometry of the reaction. Acetic acid reacts with hydroxide ions (OH-) to form acetate ions and water:

CH3CO₂H + OH- → CH3COO- + H2O

The stoichiometric ratio between acetic acid and hydroxide ions is 1:1. Therefore, the volume of 1.00 M NaOH needed can be calculated using the equation:

Volume (NaOH) × 1.00 M = Volume (CH3CO₂H) × 0.50 M × 0.5623

Volume (NaOH) = (Volume (CH3CO₂H) × 0.50 M × 0.5623) / 1.00 M

Volume (NaOH) = (250 mL × 0.50 M × 0.5623) / 1.00 M

Volume (NaOH) ≈ 70.57 mL

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The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. The frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. However, for the photoelectric effect to occur, the frequency of the incident light must be above a certain threshold frequency.

The threshold frequency is the minimum frequency of light required to dislodge electrons from the material. Below this threshold frequency, regardless of the intensity or duration of the light, no electrons will be emitted.

This behavior can be explained by the particle-like nature of light, where light is composed of discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency. Only photons with energy greater than or equal to the binding energy of the electrons in the material can dislodge them.

Therefore, the frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

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Answer:

gene

Explanation:

DNA is divided into functional units called genes. A gene is a segment of DNA that codes for a functional product (mRNA, tRNA, or rRNA). Since the vast majority of genes are transcribed into mRNA and mRNA is subsequently translated into polypeptides or proteins, most genes code for protein synthesis

Answer:

coding for protein are called exons, and the noncoding regions separating the exons are called introns. Following transcription, these coding sequences must be joined together before the mRNAs can function. The process of removal of the introns and subsequent rejoining of the exons is called RNA splicing.

Explanation:

Approximately 766.08 grams of oxygen are required to completely react with 240g of C₂H₆.

To determine the amount of oxygen required to completely react with 240g of C₂H₆ (ethane), we need to set up a balanced chemical equation for the combustion of ethane.

The balanced equation for the combustion of ethane is as follows:

C₂H₆ + O₂ → CO₂ + H₂O

From the balanced equation, we can see that the stoichiometric ratio between C₂H₆ and O₂ is 1:3. This means that for every one mole of C₂H₆, three moles of O₂ are required for complete combustion.

To calculate the amount of oxygen required, we need to convert the given mass of C₂H₆ to moles using its molar mass, and then use the stoichiometric ratio to determine the moles of O₂ required. Finally, we can convert the moles of O₂ back to grams using the molar mass of oxygen.

The molar mass of C₂H₆ is calculated as follows:

(2 x atomic mass of carbon) + (6 x atomic mass of hydrogen)

(2 x 12.01 g/mol) + (6 x 1.01 g/mol) = 30.07 g/mol

Now, we can proceed with the calculation:

Calculate the moles of C₂H₆:

moles of C₂H₆ = mass of C₂H₆ / molar mass of C₂H₆

moles of C₂H₆ = 240 g / 30.07 g/mol ≈ 7.98 mol

Determine the moles of O₂ using the stoichiometric ratio:

moles of O₂ = moles of C₂H₆ x (3 moles of O₂ / 1 mole of C₂H₆)

moles of O₂ = 7.98 mol x 3 ≈ 23.94 mol

Convert moles of O₂ to grams:

mass of O₂ = moles of O₂ x molar mass of O₂

mass of O₂ = 23.94 mol x 32.00 g/mol = 766.08 g

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The reaction involving the reactants Magnesium and Sulphuric acid results in the formation of Magnesium sulphate and hydrogen

Mg (s) + dil. H2SO4 (aq) ➡️ MgSO4 (aq) + H2 (g)

Magnesium is a solid compound. When magnesium reacts with dilute sulphuric acid, it forms aqueous magnesium sulphate and hydrogen gas.

The type of reaction involved is single replacement reaction with both oxidation and reduction happening simultaneously. During the process, heat would be released becoming an exothermic reaction.

If concentrated sulphuric acid is used in place of dilute sulphuric acid, magnesium would react with concentrated sulphuric acid and forms 3 products namely magnesium sulphate, Sulphurdioxide and Water.

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"All matter is made of tiny particles called atoms" is considered a scientific theory. Therefore the correct option is (B)

A scientific theory is a well-substantiated explanation of a natural phenomenon that has been repeatedly tested and confirmed through observation, experimentation, and data analysis.

From the statements in the question above, we can see that Option (B)  is a well-established and widely accepted explanation of a natural phenomenon that has been extensively tested through observation and experimentation.

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Braxtons dog eats 3 times more than Abbys

Answer:

Braxton's dog eats 3 times more food.

Explanation:

The theoretical yield of CO₂ formed in the reaction is 313.35g

The given reaction can be expressed as:

2C₈H₁₈ + 25O₂ ⇒ 16CO₂ + 18H₂O

No. of moles of octane = 102/114.23

                                     = 0.89 mol

No. of moles of oxygen = 520/32

                                    = 16.25 mol

No. of moles of O₂ needed to react with 0.89 mol of octane = 25/2 × 0.89

                                                                                            = 11.125 mol          Here, O₂ is present in excess. Hence octane is a limiting reagent.

No. of moles of CO₂ produced = 16/2 × 0.89

                                               = 7.12 mol

Weight of CO₂ produced = Moles of CO₂ × Molar mass of CO₂

                                         = 7.12  × 44.01

                                        = 313.35 g of CO₂

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The quotient of the given mathematical problem is equal to 2. Therefore, option A is correct.

In arithmetic, a quotient can be described as a quantity produced by the division of two numbers. The quotient has used throughout mathematics and is referred to as the integer part of a division or as a fraction or a ratio.

A rational number is the quotient of two integers when the denominator is non-zero.

A real number r is rational, it can be expressed as a quotient of two integers with a non-zero denominator.

Given a real number r, r is rational if and only if there exist integers a and b such that\({\displaystyle r={\tfrac {a}{b}}}, {\displaystyle b\neq 0}\)

Given, the division of √100/√25

We can write the \(\sqrt{100} =\sqrt{25\times 4} =\sqrt{25} \sqrt{4}\)

Now, \(\displaystyle \frac{\sqrt{100}}{\sqrt{25}}= \frac {\sqrt{25}\times \sqrt{4} }{ \sqrt{25}} =\sqrt{4} =2\)

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