A student completed a lab report. Which correctly describes the difference between the “Question” and “Hypothesis” sections of her report? “Question” states what she is asking, and “Hypothesis” states the result of her experiment. “Question” states what she is asking, and “Hypothesis” states what she thinks the answer to that question is in “if . . . then . . . because” format. “Question” describes what she is trying to find out, and "Hypothesis" states the procedures and methods of data collection. “Question” describes what she is trying to find out, and “Hypothesis” states any additional information or prior knowledge about the question.

Answers

Answer 1

The question in a investigation is the problem that we are asked to find and the hypothesis states what we thinks the answer to that question.

What is a scientific question?

In a scientific experiment, the problem on which we work to solve or the question addressing an unknown thing is called a scientific question. The scientific question have to be precise and experientable.

A scientific hypothesis is a predictive statement describing the possible answer of the problem under study based on the observations and some previous scientific reports.

A hypothesis must be rectifiable, testable and falsifiable. We are checking whether our hypothesis is true or false through an experiment. Hence, second option is correct.

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Related Questions

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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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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The molar heat of fusion of gold is 12.550 kJ mol–1. At its melting point, how much mass of melted gold must solidify to release 235.0 kJ of energy?

Answers

The mass of melted gold to release the energy would be  3, 688. 8 Kg

How to determine the mass

The formula for quantity of energy is given thus;

Q = n × HF

Where n represents number of moles

HF  represents  heat of fusion

To find the number of moles, we have

235.0 = n × 12.550

number of moles = [tex]\frac{235}{12. 550}[/tex] = 18. 725 moles

Note that molar mass of Gold is 197g/ mol

Let's note that;

Number of moles = mass/ molar mass

Mass = number of moles × molar mass

Mass = 18. 725 × 197

Mass = 3, 688. 8 Kg

Thus, the mass of melted gold to release the energy would be  3, 688. 8 Kg

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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

If you start with 4 moles of iron and 3 moles of oxygen to produce iron oxide, what is the limiting reagent? (You will need to balance the equation first.) Fe + O2 -> Fe2O3

A. they are equal
B.Fe
C. O2
D.Fe2O3​

Answers

The correct statement regarding the limiting reactant for the reaction between 4 moles of iron and 3 moles of oxygen is: They are both equal. (Option A)

Balanced equation

We'll begin by writing the balanced equation for the reaction between iron and oxygen. This is given below:

4Fe + 3O₂ --> 2Fe₂O₃

SUMMARY

From the balanced equation above,

4 moles of Fe reacted with 3 moles of O₂

How to determine the limiting reactant

The limiting reactant is the reactant that is consumed completly in a chemical reaction.

The limiting reactant can be obtain as illustrated below:

From the balanced equation above,

4 moles of Fe reacted with 3 moles of O₂

From the illustration above, we can see that 3 moles of Fe required 4 moles of O₂ for complete reaction.

Thus, Fe and O₂ are both the limiting reactant.

Therefore, we can conclude that Fe and O₂ are equal

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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⁺

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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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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What is the pH of a 0.0100 M sodium benzoate solution? Kb (C7H5O2-, ) = 1.5 x 10^-10
A) 0.38
B) 5.91
C) 8.09
D) 9.82
E) 13.62

Answers

The pH of a 0.0100 M sodium benzoate solution with a Kb of 1.5 × 10-¹⁰ is 5.91 (option B).

How to calculate pH?

The pH of a solution in chemistry refers to the notation expressing the acidity or alkalinity of a solution.

The pH is measured on a logarithmic scale of which 7 is neutral, lower values are more acid and higher values more alkaline.

The pH of a solution can be calculated using the following formula;

pH = - log {H+}

pH = - log {0.0100}

pH = 2

Therefore, the pH of a 0.0100 M sodium benzoate solution with a Kb of 1.5 × 10-¹⁰ is 5.91.

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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

Room temperature is approximately 20°C for scientific purposes. A hot pan on a stove can reach temperatures up to about 260°C. Given this information, what can you conclude about the melting points of sugar and salt?

Answers

The melting points of sugar and salt are above 20°C.

What is melting point?

The melting points of substances refer to the temperature at which solid substances gain enough energy to become liquids.

The room temperature is approximately 20°C. At this temperature, sugar and salt are solids. This means that the melting temperature of both substances is above 20°C.

More specifically, sugar will melt around 180 °C while salt will melt at a temperature slightly above 800 °C.

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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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I need help with the solution

Answers

Answer:

1

Explanation:

The empirical formula describes the simplest whole number ratio of each type of atom in a compound. To find this formula, you need to (1) convert grams of each element to moles (via their atomic masses) and then (2) find the ratio of each element (by dividing each molar value by the smallest mole value).

(Step 1)

Atomic Mass (Zn): 65.380 g/mol

Atomic Mass (C): 12.011 g/mol

Atomic Mass (O): 15.998 g/mol

10.40 grams Zn              1 mole
------------------------  x  ------------------------  =  0.159 moles Zn
                                   65.380 grams

   

1.92 grams C               1 mole
---------------------  x  -----------------------  =  0.160 moles C
                                 12.011 grams

7.68 grams O               1 mole
----------------------  x  ------------------------  =  0.480 moles O
                                 15.998 grams

(Step 2)

0.159 moles Zn / 0.159  =  1 atom Zn

0.160 moles C / 0.159  =  1 atom C

0.480 moles O / 0.159  =  3 atom O

The empirical formula is ZnCO₃. Therefore, the value that should be in the space is 1.

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

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

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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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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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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C4H4N2 lewis structure and formal charges minimized

Answers

The molecule  is composed of two nitrogen atoms above and below the plane of four carbon atoms to which four hydrogen atoms are attached.

What is Lewis structure?

The Lewis structure shows the arrangement of electrons in atoms of molecules. The molecule C4H4N2 is called pyrazine. It is composed of two nitrogen atoms above and below the plane of four carbon atoms to which four hydrogen atoms are attached.

The structure of the molecule C4H4N2  in which formal charges are minimized is shown in the image attached to this answer.

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Conversion factors are useful in solving problems in which a given measurement must be expressed in
a. some other unit of measure.
b. the correct precision.
c. the correct number of significant digits.
d. scientific notation.

Answers

Conversion factors are useful in solving problems in which a given measurement must be expressed in some other units of measure.


Conversion factors
are helpful in solving issues where one unit of measurement needs to be expressed in another. In general, a measurement's numerical value changes when it is multiplied by a conversion factor, while the quantity being measured's real size stays the same.
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. For instance, 12 inches equals one foot when converting between inches and feet.

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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  

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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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.

What is the name of Pb(NO3)2? Explain how you determined the bond type and the steps you used to determine the naming convention for the compound.

Answers

The name of Pb(NO3)2 of is Lead II trioxonitrate V

The bond which exist in is Lead II trioxonitrate V ( Pb(NO3)2 ) are both ionic and covalent bond

What is a compound?

A compound is a substance which contains two or more elements chemically combined together

So therefore, the name of Pb(NO3)2 of is Lead II trioxonitrate V

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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 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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4 and 5 pls and thank uuu

Answers

Answer:

4. -ol

5. cyclic ketone

Explanation:

biology stuff

sorry it's hard to explain

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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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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which statement describes a difference between prokaryotic and eukaryotic cells what number can divide 153 and 48. 50 points will.amrk as brainliest Much of california continues to be soaked by heavy rains from a phenomenon known as? You have 2.88 meters of copper wire and 5.85 meters of aluminum wire. You need 0.24 meter of copper wire to make one bracelet and 0.65 meter of aluminum wire to make one necklace. Can you make more bracelets or more necklaces? Explain. Determine if the following system ofequations has no solutions, infinitelymany solutions or exactly one solution.2x + 5y = 4-4x - 13y=-9 Explain how the great awakening paced the way for the American revolution susan b anthony apush definition A man crosses a distance of 48 meters while going round a quadrilateral field twice. What will be the cost of fencing the field at the cost $1.75 per meter? a downward force of 400 N is applied to the small piston with a diameter of 6 cm in the hudraulic lift system. What is the a) upward force exerted by the large piston with diameter of 30 cm b) if the input force pushes the small piston down by 25 cm how high will the large piston rise Ask your question!The Sequence X[N] = Cos (/4 N). < N < Was Obtained By Sampling A Continuous-Time Signal X C (T) = Cos ( 0 T). < T < , At A Sampling Rate Of 1000 Samples/S, What Are Two Possible Positive Values Of 0 That Could Have Resulted In The Sequence X[N]?The sequence x[n] = cos (/4 n). < n < was obtained by sampling a continuous-time signal xc(t) = cos (0t). < t < ,at a sampling rate of 1000 samples/s, what are two possible positive values of 0 that could have resulted in the sequence x[n]? Find the measures of x and y.X=Y= Which of the following aqueous solutions has the highest molar concentration of Na+ (aq)? (Assume each compound is fully dissolved in water:) Ier All of these solutions have the same concentration of Na+ (aq) A.6.0M NaCl (sodium chloride) B.6.OM NaC2H302 (sodium acetate) C.2.OM Na3PO4 (sodium phosphate) D.ed 3.OM Na2SO4 (sodium sulfate) Give an example of a mutation and explain if the mutation is good, bad, or does not change the organism. Identify the initial amount a and the rate of decay r (as a percent) of the exponential function f (t)=475(0.5)^t . Evaluate the function when t=3 . Round the answer to the nearest tenth Write a mixed number for t so that 2 3/4 X is more than 2 3/4 I really need help . 28.25 x 9.60 In terms of binding energy per nucleon, what element divides fission and fusion processes? He U Fe C H bonjour, pouvez vous maider pour la contraction de texte svp cst urgent cest pour vendredi Gas mileage is the number of miles you can drive on a a gallon of gasoline. A test of a new car results in 460 miles on 20 gallons of gas. How far could you drive on 50 gallons of gas? What is the car's gas mileage? What substances are produced when an acid reacts with base?