For this question, choose THREE answers. A student adds two chemicals together in lab and observes a succe
ssful reaction. Which of the following can be assumed about the reactants they used?

Answers

Answer 1

Answer is Answer

Explanation:

Answer 2

The three correct answers about the reactants they used for a successful reaction are:

They successfully collided with each other.They had the minimum activation energy.They were oriented in the correct direction.

What is the collision theory?

The collision theory states that successful chemical reactions occur when reactant particles collide with each other with sufficient energy and proper orientation.

Based on the collision theory,  for a successful reaction to occur, the reactants must collide with each other with sufficient energy (activation energy) and in the correct orientation.

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Complete question:

For this question, choose THREE answers. A student adds two chemicals together in lab and observes a successful reaction. Which of the following can be assumed about the reactants they used?

They had the minimum activation energy.

They did not have the minimum activation energy.

They were not oriented in the correct direction.

They were oriented in the correct direction.

They did not successfully collide with each other.

They successfully collided with each other.


Related Questions

A liquid has q voulume of 34.6 mL and a mass of 46.0g ehat is the density of the liquid

Answers

Answer:

1.33 g/mL

Explanation:

The density of a substance can be calculated using the following formula:

Density = mass (g) / volume (mL)

Since you have been given both the mass and volume, you can easily calculate the density of the liquid.

Density = mass / volume

Density = 46.0 g / 34.6 mL

Density = 1.33 g/mL

pls help question is above ​

Answers

a. The calories increase by 9:00 whenever the running speed goes up by two. so so if a dog were running at 10 km/h it would be 54 calories burnt

b. they are multiplied by 9

Hi I need help with the Lab report for the 'Flame Lab' in edge

Answers

Flame test is a qualitative test which is used to identify the metal and metalloid ion in the sample.

What is Flame Test ?

A Flame test is used to identify the metal and metalloid ion in the sample. Flame test is a qualitative test. Not every metal ion emit color when it is heated in the gas burner.

What is the Purpose of Flame test ?

The purpose of flame test is used to find the identities of ions in two solutions of unknown composition by comparing the colors they produce.

What are the material used ?Bunsen Burner MatchesGlovesWeighing dishes Beakers

Thus from the above conclusion we can say that Flame test is a qualitative test which is used to identify the metal and metalloid ion in the sample.

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The protons of a __________ acid would be completely transferred to the solvent when dissolved.

Group of answer choices

inert

neutral

strong

weak

Answers

The protons of a strong acid would be completely transferred to the solvent when dissolved.

What is an acid?

An acid is defined as a substance that contains hydrogen that it can donate when reacting with another substance.

There are two main types of an acid which include:

weak acids and

strong acids.

A strong acid is a type of acid that has the ability to donate it's hydrogen/ protons completely in a chemical reaction.

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when a candle burns what changes are observed?

Answers

Answer:

it's state changes from solid to liquid

Lactic acid has a pKa of 3.08. What is the approximate degree of dissociation of a 0.35 M solution of lactic acid?

Answers

The approximate degree of dissociation of a 0.35 M solution of lactic acid is 4,87%

What is  degree of dissociation?

The degree of dissociation is the quantity used to express the strength of a base, that is, its ability to conduct electric current, which depends on the amount of ions released in the dissociation.

The degree of dissociation (α) is another way of determining the strength of a base. It indicates the fatty acids that were released from a base when it dissociates in water.

With that being said, C stands for concentration and α is the the degree of dissociation.

Latic Acid can be written as  C3H6O3

[tex]CH3Ch(OH)CO2H < -- > H^{+} + CH3CH(OH)CO2^{-}[/tex]

[tex]Ka = \frac{[H^{+}] [CH3CH(OH)CO2^{-}] }{CH#CH(OH)CO2H} = \frac{C^{2} \alpha^{2} }{C(1-\alpha )} = \frac{C\alpha ^{2} }{(1-\alpha )}[/tex]

As α is too small (1-α) can be neglected.

[tex]Ka = C\alpha ^{2} \\\\\\alpha = \sqrt[]{\frac{Ka}{C} }[/tex]

[tex]Ka = 10^{-3,08} = 8,32 .10^{-4} .10^{-4} = 0,35[/tex]

[tex]\alpha = \sqrt{\frac{ka}{C} } \\\\\alpha = \sqrt{\frac{8,32.10^{-4} }{0,35} } = 0,0487[/tex]

In this case, is possible to see that  approximate degree of dissociation of a 0.35 M solution of lactic acid is 4,87%

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18. What is assigned a rating of 3 in the yellow diamond of the NFPA 704 symbol.
OA. Helium
OB. Sodium
OC. Ammonium nitrate
OD. Chlorine dioxide

Answers

OD. Chlorine dioxide

The valence electrons found in metallic bonds are different from other bonds
because
A. their valence electrons are immobile
B. they allow for the conductivity of electricity
c. they're able to share electrons with other atoms
D. their valence electrons are free-roaming
SUBMIT

Answers

Answer:

D.) their valence electrons are free-roaming

Explanation:

Metals tend to arrange themselves in crystalline structures once they form metallic bonds. The electrons around the positive nuclei are delocalized, and thus freely float within the structure. This is unique to metallic bonding.

How to convert butanoic acid to propanamide?​

Answers

Butanoic acid is converted to propanamide by first converting it to propanoic acid, then ammonium propanoate and then finally propanamide by heating.

How are carboxylic acids converted to amides?

Carboxylic acids are converted to amides by converting them into into an ammonium salt which then produces an amide on heating.

The ammonium salt is prepared by adding ammonium carbonate to an excess of the acid. The ammonium salt is then heated to give the amide

Therefore, butanoic acid is converted to propanamide by first converting it to propanoic acid, then ammonium propanoate and then finally propanamide by heating.

In conclusion, carboxylic acids are converted to amides in two steps.

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convert ethene to propanamine​

Answers

STEP 1: ON TREATING CHLOROETHANE WITH KCN WE GET PROPANE - NITRILE . STEP 2: ON TREATING PROPANE - NITRILE WITH LiAlH4 WE GET PROPANAMINE.

Which scenario would be classified as a conceptual model?
A. A student thinks of bouncing balls as representing gas molecules.
B. Marshmallows and toothpicks are used to show the composition
of a water molecule.
C. A map and a map scale are used to represent a larger area of land.
D. A weather map shows different temperatures over most of the
United States.

Answers

The correct answer is A. A student thinks of bouncing balls as representing gas molecules.

What is molecules?

When one effectiveness liquefies into another, a resolution is formed. A solution is a homogenous mixture consisting of a solute liquefied into a solvent. The solute is the substance that is being dissolved, while the solvent is the dissolving medium.

Solutions can be formed with numerous different varieties and forms of solutes and solvents. In this department, we will focus on a solution where the solvent is water. An aqueous solution is moisture that contains one or more additional dissolved essence. The dissolved importance in an aqueous resolution may be solids, gases, or different liquids.In directive to be a true explanation, a variety must be stable. When sugar is fully dissolved into water, it can stand for an indefinite quantity of time, and the sugar will not recompense out of the solution. Further, if the sugar-water solution is passed through a filter, it will remain with the water. This is because the liquefied particles in a solution are very small, usually smaller than 1nm in diameter. Solute particles can be particles, ions, or molecules, counting on the classification of nature that has been dissolved.

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1. Based on the observed performance of the air bag models and the amounts of sodium bicarbonate and acetic acid (vinegar) needed for an automotive air bag of 80 or 160 L, are these reactants a good substitute for sodium azide? One additional note regarding sodium azide: the rate of inflation after a triggering impact is 40 milliseconds (0.04 s).

Answers

Sodium bicarbonate and acetic acid are not good substitute for sodium azide in airbags since the require more mass and produce less gas.

Which is the better chemical for an airbag?

The chemical equation for the production of nitrogen gas from sodium azide is given below:

NaN₃ → 2 Na + 3 N₂

1 mole or 66 go of sodium azide produces 3 moles or 67.2 L of nitrogen gas.

The equation for the production of carbon dioxide from sodium bicarbonate and acetic acid is given below:

Na₂CO₃ + CH₃COOH → CH₃COONa + CO₂ + H₂O

1 mole, 106 g of Na₂CO₃ and 1 mole, 82 g of CH₃COOH are required to produce 1 mole or 22.4 L of CO₂.

The mass of sodium azide required is less than that of sodium bicarbonate and acetic acid required. Also, sodium azide produces a greater volume of gas. Therefore, sodium bicarbonate and acetic acid are not good substitute for sodium azide in airbags.

In conclusion, sodium azide is a better choice in airbags.

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Which of the following was an incentive for profit to settle the Mississippi Valley region?

Availability of fish and furs
Abundance of Native Americans to convert to Catholicism
Mildness of the temperature of the region
Excitement of the wilderness

Answers

The correct option is (a) Availability of fish and furs. An incentive for profit to settle the Mississippi Valley region

Arkansas, Illinois, Iowa, Kentucky, Louisiana, Michigan, Minnesota, Mississippi, Missouri, North Dakota, Tennessee, Wisconsin, and South Dakota are among the 13 states that are either entirely or partially included in the division of Mississippi Valley region

The canoe was the first ferry to travel on the Mississippi River. Long before the white settlers ventured as far west as the Mississippi, it provided the Indians with a means of crossing. It is also one of the most significant commercial waterways in the world and a key fish and bird migration route in North America. Native Americans used the river for transportation and food while they lived along its banks.

Therefore, The correct option is (a) Availability of fish and furs. An incentive for profit to settle the Mississippi Valley region.

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Because of a scarcity of workers in the New World, persons were transported against their will to work on large farms without pay and under difficult conditions. Which of the following best describes this?

British indentured servant
Enslaved African
Spanish conquistador
French fur trapper

Answers

Enslaved African is best described as the condition which involved transporting people against their will to work on large farms without pay.

What is Slavery?

This is referred to a situation in which an individual is owned by another. Slaves were moved from Africa against their will to work on large farms.

They weren't given any pay and worked under hard conditions thereby making option B the correct choice.

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Identify the chirality center (sometimes called chiral atom) in each molecule. If the molecule does not contain a chirality center, select none.

Answers

The only chiral center in the molecule is carbon 4 because is attached to four different atoms or groups.

What is a chiral center?

The term chiral center refers to a carbon atom that is attached to four different atoms or groups. This kind of carbon atom is able to rotate the direction of plane polarized light.

We can see from the structure of the molecule that the only chiral center in the molecule is carbon 4 because is attached to four different atoms or groups.

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A student measures the length of an object to be 152 cm. What is the measurement in km?

Answers

Answer:

0.00152 km

Explanation:

The easiest way to complete the conversion is by (1) converting cm to m and then (2) converting m to km. It is important to arrange the conversions in a way that allows for the cancellation of units.

1,000 m = 1 km

100 cm = 1 m

152 cm             1 m                 1 km
-------------  x  --------------  x  ----------------  =  0.00152 km
                      100 cm          1,000 m

Length ConversionKnowing that 100,000 cm = 1 km.

[tex]\large\displaystyle\text{$\begin{gathered}\sf So \to \ \ 152\not{cm}*\frac{1 \ km}{100,000\not{cm}}=0.00152 \ km \end{gathered}$}[/tex]

Answer:Therefore, the measurement of the object in km is: 0.00152 Kilometers.

I hope my answer is useful to you

For the balanced equation: 2H2S + 3O2 → 2SO2 + 2H2O
How many moles of sulfur dioxide will be produced from the reaction of 12 moles of oxygen?


Answers

Answer:

8 moles SO₂

Explanation:

To find the moles SO₂, you need to multiply the given value by the mole-to-mole ratio. This ratio, between O₂ and SO₂, is made up of the coefficients from the balanced equation.

2 H₂S + 3 O₂ -----> 2 SO₂ + 2 H₂O

12 moles O₂          2 moles SO₂
--------------------  x  ----------------------  =  8 moles SO₂
                               3 moles O₂

Determine the molecular shape of each of the following species.

Answers

Answer:

See-saw

Explanation:

To determine the molecular shape of BrF₄⁺, you need to

1.) Calculate the valence electrons of BrF₄⁺

    ----> Add the valence electrons of each individual atom

    ----> Take the positive charge into account (subtract 1 electron)

2.) Draw the Lewis Dot diagram of BrF₄⁺

    ----> Each bond has 2 electrons

    ----> Bromine can have an expanded octet

3.) Determine the molecular shape of BrF₄⁺

What would the pH of a solution that had a hydroxide ion concentration of 1 x 10-2 M be?

Answers

Taking into account the definition of pH and pOH, the pH of the solution is 12.

Definition of pH

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:

pH= - log [H⁺]= - log [H₃O⁺]

Definition of pOH

Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

Relationship between pH and pOH

The following relationship can be established between pH and pOH:

pOH + pH= 14

pH in this case

A solution had a hydroxide ion concentration of 1×10⁻² M. In other words [OH⁻]= 1×10⁻² M.

Replacing in the definition of pOH, it is calculated as:

pOH= - log (1×10⁻² M)

Solving;

pOH= 2

Replacing in the relationship established between pH and pOH, the pH can be calculated as:

pH + 2= 14

Solving:

pH= 14 - 2

pH= 12

In summary, the pH of the solution is 12.

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C₃H₈ (g) + 5O₂ (g) --> 3CO₂ (g) + 4H₂O (l) would be best classified as which type of reaction?


precipitation


acid-base


combustion


single displacement

Answers

answer answer : combustion

In this reaction, how many grams of CH4 would be formed from 25 g C?

C + 2H2 → CH4

Answers

33.33 grams of CH4 would be formed from 25 g C.

C + 2H2 → CH4

from given reaction we can say that ,

2 moles of hydrogen is required for 1 mole of carbon and these will react to form 1 mole of methane.

atomic mass of Carbon = 12 gm

Molecular mass of H2 = 2(H)

                                  = 2(1)

                                  =2gm

moles = molecular mass / given mass

for C,

if 12 gm = 1 mole

then 25 gm = ? mole

           =2.083 moles

1 mole of C will produce 1 moles of CH4

so, 2.083 moles of C also will produce 2.083 moles moles of CH4

molecular weight of methane= C+4(H)

                                             = 12+4(1)

                                             = 16 gm

amount of methane produced= moles × molecular mass

                                              =2.083× 16

                                              = 33.33 gm

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A neutral atom has high electronegativity.

Describe what happens to this atom during ionic bond formation.

Answers

Please get it cleared and stored into your cerebrum that a cation is formed when a neutral atom loses one or more electrons from its valence electron shell.

However too, on other hand an anion is formed when a neutral atom gains one or more electrons in its outermost electron shell.

A cation means a positive ion

An anion means a negative ion

What is electronegativity?

Electronegativity is one of physical periodicity and property of elements that describes the tendency of an atom to attract electrons toward itself.

Generally, electronegativity of an atoms of elements in a particular trend is affected by both its atomic number and the distance that its valence electrons reside from the charged nuclei.

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4NH3+5O2=4NO+6H20 if 32.5 grams of NH3 react with enough oxygen, how many grams of water should form?

Answers

51.3 gram of water should form if 32.5 g of NH₃ react with enough oxygen.

How to find the Number of moles ?

To calculate the number of moles use the formula

Number of moles = [tex]\frac{\text{Given Mass}}{\text{Molar Mass}}[/tex]

                              = [tex]\frac{32.5}{17}[/tex]

                              = 1.9 mol

4NH₃ + 5O₂ → 4NO + 6H₂O

4 mol of NH₃ react with oxygen to given 6 mole of water.

So 1.9 mol of NH₃ produces = [tex]\frac{1.9}{4}\times 6[/tex]

                                              = 2.85 mol of water

Mass of water = Molar Mass of water × Number of moles of water

                        = 18 × 2.85

                        = 51.3 gram

Thus from the above conclusion we can say that 51.3 gram of water should form if 32.5 g of NH₃ react with enough oxygen.

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Activity
In this activity, you will examine the difference between opinions, facts, theories, and laws. To do so, examine the table
below. Carefully read each example in the table before answering the questions thatfollow.

Answers

Opinions are differ from facts as that we cannot change the facts but opinions can be changed as in first example it is given anthracite is better than bituminous coal may be there is another coal which is more better than anthracite. So here opinion is changed.

What is Coal ?

It is a black or brownish black sedimentary rock. It contains Sulphur, hydrogen, oxygen, carbon etc. It is always preferred as fuel. Coal was formed millions years ago when plant decay in the soil. It is obtained from dead vegetation. It is obtained from dead plants matter decay into peat and then it is converted into the coal by the process of heat.

What is Solar System ?

Solar System is made up of all the planets that revolve around our Sun. Solar System contains eight planets. These planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

Thus from the above conclusion we can say that Opinions are differ from facts as that we cannot change the facts but opinions can be changed as in first example it is given anthracite is better than bituminous coal may be there is another coal which is more better than anthracite. So here opinion is changed.

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Write the balanced molecular equation for the aqueous reaction of hydroiodic acid (HI) and zinc metal.

Answers

The balanced chemical equation is for the aqueous reaction of hydroiodic acid (HI) and zinc metal is Zn + 2HI → ZnI₂ + H₂.

What is Balanced Chemical Equation ?

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Now write the balanced chemical equation

Zn + 2HI → ZnI₂ + H₂

Here Zn is a reducing agent, HI is an oxidizing agent.

Thus from the above conclusion we can say that The balanced chemical equation is for the aqueous reaction of hydroiodic acid (HI) and zinc metal is Zn + 2HI → ZnI₂ + H₂.

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A gas company in Massachusetts charges $1.30 for 17.0ft³ of natural gas. Convert this rate to dollars
per liter of gas.

Answers

Answer:

See below

Explanation:

Conversion factor :  1 ft^3  = 28 .317  liters

$ 1.30 /( 17 ft^3 *  28.317 liters/ft^3)    =   $.0027  per liter  

If 48.0 g of iodine are reacted with an excess of phosphorus according to the following chemical equation:

2 P(s) + 3 I2(s) → 2 PI3(s)

Calculate the theoretical yield of PI3.

If the actual yield of PI3 is 50.0 g, what is the percentage yield?

Answers

Answer:

Theoretical Yield  =  51.9 grams PI₃

Percentage Yield  =  96.3% PI₃

Explanation:

To find the theoretical and percent yield of PI₃, you need to (1) convert grams I₂ to moles I₂ (via molar mass), then (2) convert moles I₂ to moles PI₃ (via mole-to-mole ratio from reaction coefficients), then (3) convert moles PI₃ to grams PI₃ (via molar mass), and then (4) calculate the percent yield. It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answers should have 3 sig figs to match the sig figs of the given values.

Molar Mass (I₂): 2(126.90 g/mol)

Molar Mass (I₂): 253.8 g/mol

Molar Mass (PI₃): 30.974 g/mol + 3(126.90 g/mol)

Molar Mass (PI): 411.674 g/mol

2 P(s) + 3 I₂(s) -----> 2 PI₃(s)

48.0 g I₂            1 mole              2 moles PI₃            411.674 g
---------------  x  -----------------  x  ----------------------  x  ------------------  =  
                         253.8 g               3 moles I₂              1 mole

=  51.9 g PI

                                           Actual Yield
Percentage Yield  =  ---------------------------------  x  100%
                                      Theoretical Yield

                                     50.0 g PI₃
Percentage Yield  =  --------------------  x  100%
                                     51.9 g PI₃

Percentage Yield  =  96.3% PI


Why is scientific notation used?

to round numbers to the nearest whole number
to promote reproducibility of data
to increase the validity of data
to express very large or very small numbers

Answers

The correct option is (d) To express very large or very small number.

What is the Scientific Notation?

Scientific notation is a way to present numbers that are too large or too small to be easily written in decimal form. The three components of  scientific notation are coefficient, base and exponent. The proper format to write a scientific notation is a x 10^b, where a is a number or decimal number and b is the power of 10 to make scientific notation equivalent to original number. When a number between 1 and 10 is multiplied by a power of 10 then the number is expressed in scientific notation. For example,  10000000 can be written as 10⁷, which is the scientific notation and the exponent is positive here. Similarly, for the negative exponent 0.000001 can be can be represented as 10-⁷.                             Hence, the scientific notation is used to express very large or very small numbers.

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How many molecules of zinc oxide are there in a 2 kg sample?

Answers

There are 1.48 × 10²⁵ molecules of zinc oxide in a 2 kg sample. Details about number of molecules can be found below.

How to calculate number of molecules?

The number of molecules of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number.

According to this question, there are 2000g of ZnO in a sample. Zinc oxide has a molar mass of 81.38 g/mol.

no of moles = 2000g ÷ 81.38g/mol

no of moles = 24.57mol

number of molecules = 24.57 × 6.02 × 10²³

number of molecules = 147.95 × 10²³

Therefore, there are 1.48 × 10²⁵ molecules of zinc oxide in a 2 kg sample.

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The pressure in car tires is often measured in pounds per square inch ( lb/in.2 ), with the recommended pressure being in the range of 25 to 45 lb/in.2 . Suppose a tire has a pressure of 32.5 lb/in.2 . Convert 32.5 lb/in.2 to its equivalent in atmospheres.

Express the pressure numerically in atmospheres.

Answers

when we convert 32.5 lb/in² to atmosphere, the result obtained is 2.21 atm

Conversion scale

14.6959 lb/in² = 1 atm

Data obtained from the questionPressure (in lb/in²) = 32.5 lb/in²Pressure (in ATM) =?

How to convert 32.5 lb/in² to atm

14.6959 lb/in² = 1 atm

Therefore

32.5 lb/in² = 32.5 / 14.6959

32.5 lb/in² = 2.21 atm

Thus, 32.5 lb/in² is equivalent to 2.21 atm

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Autumn buys 5 hats at $8.99 each. How much does she spend? Solve the equation x-20.7=9.5 for x plz i need help hurryand how do you mark brainliest the maximum number of students in a classroom is 26. if there are 16 students sign up for the art class,how many more students can join the class without exceeding the maximum? ues ">=" for more than and " When the angle of elevation to the sun is 42 a flagpole casts a shadow that is 21 ft long. What is the height of the flagpole to the nearest foot? V (x) = (18 - 2x) (24-2x) (x)what is a reasonable domain for V in this context? How would you write this number in numeric form?twenty-two and ninety-four thousandths The total variety of all living things on Earth is described as an ecosystemB biodiversity a populationD competition para qu sirve la filosofa 1/6 + (-7/9) in simplest form Simple question: What is the difference between 32% vs 15%? if Lauren robed (22+34) bread from the bread factory how much bread would she have. What determines the code, or information, of a DNA molecule? A - the structure of nitrogen basesB- the color of nitrogen basesC- The sequence (order) of nitrogen bases D- the frequency of nitrogen bases 27. A multiple choice test contains 5 questions, and each question has four possible responses.How many different answer keys are possible?A. 20B. 120C. 256D. 1024 Consider the ranges of pitches made by these instruments and vocals.A graph with frequency in Hertz on the x axis from 27 Hertz to 4166 Hertz. On the y axis are piccolo, oboe, flute, soprano vocal, violin, alto vocal, trumpet, clarinet, tenor vocal, bass vocal, guitar, french horn, bassoon, tuba, standup bass, bass guitar and pipe organ. Piccolo is 620 to 4166 Hertz, Oboe is 275 to 2200 Hertz, flute is 275 to 2200 Hertz, Soprano vocal is 200 to 1850 Hertz, violin is 196 to 3135 Hertz, alto vocal is 180 to 1760 Hertz, trumpet is 164 to 1050 Hertz, clarinet is 164 to 1900 Hertz, tenor vocal is 130 to 1306 Hertz, bass vocal is 96 to 987 Hertz, guitar is 83 to 850 Hertz, french horn is 83 to 1050 Hertz, bassoon is 61 to 529 Hertz, tuba is 49 to 246 Hertz, standup bass is 41 to 275 Hertz, bass guitar is 41 to 400 Hertz and pipe organ is 27 to 4166 Hertz.In terms of the highest pitches they can make, which list correctly orders the instruments and vocals from highest to lowest?clarinet, bassoon, piccolo, soprano vocalpiccolo, oboe, standup bass, tenor vocaltuba, bass guitar, violin, piccoloviolin, clarinet, French horn, tuba Glven the value of cos 60 -0.5, enter the sine of a complementary angle. Use anexpression relating trigonometric ratios of complementary angles.cOS 60= ___ ___ PLEASE HELP! ASAP please help A. Describe the role of the promoter in eukaryotic gene expression. Explain how a negative regulatory molecule could inhibit transcription at the promoter.B. Identify TWO events that occur during RNA processing. Explain how RNA splicing increases the variation of mRNA molecules.C. Describe the role of miRNA in gene expression. PLZ HELP ME :(Tanisha lives in an apartment and pays the following expenses each month: electric bill,$42.60; TV streaming service,$27.99; and rent,$587.70. Estimate her total expenses for the month by first rounding each value to the nearest tens place.A.)$659B.)$650C.)$670D.)$660 Ella practices piano for 45 minutes she spends m minutes longer working on her homework than she does practicing the piano