Which graph represents an exothermic reaction?

To check the protein in the drink the test carried out is Biuret Test

What is Biuret Test?

The chemical test known as the "Biuret test" uses the Biuret reagents to produce the compound known as "Biuret," which is created by heating urea to 180 °C. A 1% solution of Copper II sulphate is used in the test  

([tex]CuSO_{4}[/tex]). The peptide bonds found in proteins create a compound with the [tex]Cu^{2+}[/tex] in the Biuret reagent. This test therefore aids in identifying peptide bonds in any substance.

The reagent in the biuret test does not really include biuret; however, the test's name derives from the fact that the peptide-like linkages in the biuret molecule produced a favorable reaction.

Two of the many more sophisticated variations of the biuret test are the Lowry test and the BCA test.

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Answer:

They represent electrons

Explanation:

1.0 mol of K₂ Cr₂07 contains 2 mol K, 2 mol per 7 mol 0.

One mole of atoms of any element carries 6.022 X 1023 atoms, regardless of the kind of detail. Use the periodic table to determine the molar mass of the element. Divide the given mass in grams by the molar mass to locate the range of moles. Multiply the number of moles via Avogadro's wide variety to attain the variety of atoms. There are 24 atoms in a single molecule of C6 H12 06. This chemical compound has 6 atoms of carbon, 12 atoms of hydrogen, and six atoms of oxygen. this is a total of 24 atoms.

The mole is the quantity of substance of a system that includes as many fundamental entities as there are atoms in zero. 012 kilogram of carbon 12 its symbol is mol To discover the number of moles in a sample, simply weigh it and divide the weight by way of the molecular weight. The quotient is equal to the variety of moles. The number of atoms or different particles in a mole is the same for all substances divided by the mass of the substance in grams via its molecular weight. this could provide you with the range of moles of that substance that are inside the targeted mass.

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An experiment occurs when we want to study the relationship between the dependent and the independent variable. We know that the independent variable is the variable that is manipulated in the experiment and the dependent variable variable is the variable that undergoes a change as we change the independent variable.

It must be known that an experiment is the only way that we could be able to establish a cause and effect relationship. In other words, the results of an experiment tell us categorically if the effect owes to a supposed cause as was captured in the hypothesis of the experiment.

In this case we have the following in this experiment;

The independent variable is the use or absence of the test guide

The dependent variable is the overall performance in the academic year

The control group is the group that did not use the test guides

The experimental group is the group that used the test guides

The constants are the method of instruction, the structure of the test and the difficulty of the test.

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Missing parts;

The local high school recently passed a rule reducing how much teachers can count homework as part of a student's grade. Consequently, a larger portion of the students stop doing their homework. A teacher there decides to conduct an experiment. All of his classes get an optional "test guide" to help them study for their tests. He allows two classes to use the "test guides" (that they must fill in and complete) on their exams. He hypothesizes that students will complete the test guides and learning will occur from filling them out. In his other 2 classes, the teacher does not allow students to use test guides on the exam, and consequently very few of them filled them out. After the 2017-2018 year is over, he wants to compare scores between the 4 classes on the final exam to see if allowing students to use test guides during each test throughout the year improved their later overall performance.

Independent Variable: _____________________________ Dependent Variable: ___________________________________

Experimental Group: _______________________________ Control Group: _________________________________________

3 constants: ______________________________________________________

Answer:

in the middle region of the periodic table, where the transition metals are

aka between Group II and III

The percentage atom economy is 62%

2NH3 + H₂SO4 → (NH4)2SO4

34 gram 98 gram 210 gram

2 mol 1 mol 1 mol

% atom economy = mass of atoms in desired product/total mass of atom in Product x 100

% atom economy = 132/210 x 100 = 0.62 = 62%

The amount of desirable useful products produced from reactants is measured by atom economy, also known as atom efficiency. It is frequently expressed as a percentage and is referred to as percentage atom economy. The required product atoms are divided by the total number of reactants, which is equal to the total number of product atoms, to determine the percent atom economy

Higher atom economy reactions provide more of the desired product while producing less waste.

The following stages can be used as a generic method to compute the atom economy:

Determine the atom economy percentage.

Hence, percentage atom economy is 62%

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Matter can change state when thermal energy is absorbed into or out of the body.

Changing states of matter occur when matter loses or absorbs thermal energy. When a substance absorbs energy, the atoms and molecules move more fast which increases kinetic energy of the atoms that pushes particles far enough from each other which resulted in the change of form. This energy which changes the state of matter is the heat or thermal energy. We know that thermal energy increases kinetic energy so that's why the heat energy changes state of matter.

So we can conclude that Matter can change state when thermal energy is absorbed into or out of the body.

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Taking into account the definition of density, the density of the steel ball is 7.99 g/cm³.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it allows us to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

density= mass÷volume

Density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know that:

Replacing in the definition of density:

density= 1.765 g÷0.2209 cm³

Solving:

density= 7.99 g/cm³

In summary, the density of the steel ball is 7.99 g/cm³.

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Answer:

The victim has been dead for approximately 12 hours.

Explanation:

Algor mortis, or the cooling of the body after death, is a reliable way to estimate time of death. The average body temperature is 98.6 degrees Fahrenheit, so 85.2 degrees Fahrenheit would be 12 hours after death.

Ashless filter paper is the correct option.

Therefore, option a. is correct.

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Answer: A) Delta

Explanation:

A river delta is a landform shaped like a triangle, created by deposition of sediment that is carried by a river and enters slower-moving or stagnant water. This occurs where a river enters an ocean, sea, estuary, lake, reservoir, or another river that cannot carry away the supplied sediment.

Hope this helped!

Answer: Oxide anion. Oxide ion. Atomic oxygen(2-) Oxygen, ion(O2-)

Description: Oxide(2-) is a monoatomic oxyge...

Molecular Formula: O-2

Synonyms: oxideoxide(2-)16833-27-5Oxide a...

Molecular Weight: 15.999

Explanation: I hope this helps.

A. None are correct.

Explanation:

Proton has positive charge and mass too.

A neutron is chargeless and has mass as well.

An electron has negative charge and has mass.

The atomic number of carbon is 6.

Hence none are correct.

The final propagated error on the density is +/-0.02g/mL

The density is the amount of a specific material per unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per centimeter are a common measurement unit used for density.

The relationship between mass and volume can be easily determined using density; for instance, the mass of a body is equal to its volume multiplied by the density (M = Vd), whereas the volume is equal to the mass divided by the density (V = M/d). By multiplying a body's mass by the acceleration of gravity, one can get the weight of the object, which is usually more important practically than its mass.

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Heat capacity when 47.0 J of heat is added to 13.0 g of a liquid, its temperature rises by 1.71 ∘C is 22.23 J/ ∘C g .

from the above statement we have got

Q = 47.0 J

MASS =  13.0 g

temperature (T) = 1.71 ∘C

heat capacity ( c ) = ?

NOW, from the formulae , Q = mcΔt

put all the values given in equation

47.0 J =  13.0 g [tex]\times[/tex] c [tex]\times[/tex]1.71 ∘C

c = 47.0 ÷ 13.0[tex]\times[/tex]1.71

c = 47/22

c = 22.23 J/ ∘C g

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In the first picture, the person seems nervous and lacks confidence while in the second one the person appears confident.

Nonverbal communication is the transfer of information through body language, facial expressions, gestures, created space, and more.

body language is essential as it makes the communication process more efficient.

facial expression depicts the nervousness and confidence of the person.

gestures involve hand movements.

In the first picture, we can see that the person's posture is bent and looking below.

In the second picture, the person has a straight posture and looks parallel.

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An alternative method for the arrangement of elements is by the use of atomic masses of the elements.

The periodic table is an arrangement of elements based on increasing atomic number. This is what is called the modern periodic law. Before the advent of the current periodic table, there have been many other kinds of periodic table.

In the periodic table as it is now, there are about 118 elements that are arranged in groups and periods. The groups contain elements that are chemically similar and could react in the same way while the periods contain elements that have the same number of shells.

However, we know that an alternative method for the arrangement of elements is by the use of atomic masses of the elements. This was the method that was used arrange the old periodic table. However, this method did not account for periodic trends.

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To separate a mixture of hard candies and marbles, the most efficient method would be filtration .

A mixture is just the physical mixing of a mixture's constituent parts, including suspensions and colloids, that maintain their identities and are thus combined in the necessary proportions.

One or more sweetener syrups are heated to 160°C to create a sugar confection known as a hard candies , often referred to as a boiled sweet.

To avoid damaging the water pipes, boil the candies if marbles are present unless they dissolve in water. Then, place a filter in the sink and run cold water for two minutes when pouring the water into the strainer and after emptying it.

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Answer:

11.176

Explanation:

The calculated mass is 35.6.

The movement of minuscule atoms, molecules, or ions in solids, liquids, and gases produces heat energy. From one thing to another, heat energy can be exchanged. Heat is the flow or transfer that occurs as a result of the temperature differential between two objects.

Q = m*c*ΔT,

ΔT = Initial T - Final T

For iron, the specific heat capacity is 0.450 J/(g°C) and ΔT Q is the heat energy in calories (2.92 KJ = 2920 Joules).

The mass of water is m.

The values 2920 J= m* 0.450 J/g°C * are entered (254 °C-72 °C)

The solution is mass=2920 J/ 0.450*180°C

mass = 35.6.

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Answer:

64.3 kilograms = 64300000 milligrams

Hope this helps :)

The average density in kilograms per litre of the crackers that measures 7.0cm X 17.0.cm X 19.0 cm is 0.1105Kg/L.

The density of a substance is a measure of the mass of matter contained by a unit volume. The density of a substance can be calculated using the following formula:

D = m/v

Where;

According to this question, a tightly packed box of crackers contains 250 g of crackers and measures 7.0cm X 17.0.cm X 19.0 cm.

Volume = 7.0cm X 17.0.cm X 19.0 cm = 2261cm³

1 cubic centimetre = 0.001 litre

2261cm³ = 2.261L

Density of the crackers = 0.25kg ÷ 2.261L

Density = 0.1105Kg/L

Therefore, the average density in kilograms per litre of the crackers that measures 7.0cm X 17.0.cm X 19.0 cm is 0.1105Kg/L.

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The  moisture must be removed from air feeding pneumatic controls because moisture corrodes the walls of an air cylinder, dilutes the oil needed for the head and rod, and reduces reaction time.

What is the mechanism of a pneumatic controller?

A pneumatic controller is a mechanical apparatus created to gauge temperature or pressure and send a corrective air signal to the last control element. The heat or pressure sensing system and the air signal relay system work together to power a pneumatic controller.

Moisture corrodes the walls, dilutes the oil needed for an air cylinder's head and rod, and slows reaction time. Efficiency and output are lost as a result. Rubber valve diaphragms may harden and rupture if moisture is allowed to get to them. Spools and pistons can develop pits as a result of moisture.

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An increase in the concentrations of greenhouse gases in Earth's atmosphere would cause an increase in the average temperatures on Earth's surface.

The greenhouse effect occurs when gases build up in the upper atmosphere of the Earth, where they absorb solar heat and trap it. Thus, the heat that ought to be fleeing into space is being held back on Earth. The following gases contribute to this effect:

with a ton more. However, the greenhouse effect is mostly caused by them. By retaining heat in the lower (rather than upper) atmosphere, this action will raise temperatures on the surface of the globe.

Heat from the sun would be trapped on Earth as the concentration of greenhouse gases (such the ones described) in the atmosphere increased, resulting in an increase in the global temperature.

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Answer:

Metals are malleable : They can be bent and shaped without breaking. This is because they consist of layers of atoms that can slide over one another when the metal is bent, hammered or pressed.

Explanation:

Pure iron is a bright silvery white metal which oxidizes (rusts) rapidly in moist air or in water containing dissolved oxygen. It is soft, malleable, and ductile, and is strongly magnetic (ferromagnetic).

The volume of hydrogen needed to react with 5.00 L of oxygen based on the mole ratio is 10.00 L.

The volume of hydrogen gas is needed to react with 5.00 L of oxygen is determined from the mole ratio of the reactants as shown in the equation of reaction below:

Equation of reaction:  2 H₂ + O₂ → 2 H₂O

Mole ratio of hydrogen to oxygen = 2 : 1

Moles of gases occupies equal volume

Therefore, Volume ratio of hydrogen to Oxygen = 2 : 1

Volume of hydrogen needed to react with 5.00 L of oxygen = 5.00 * 2

Volume of hydrogen needed to react with 5.00 L of oxygen = 10.00 L

In conclusion, the volume of hydrogen required is obtained from the mole ratio of hydrogen and oxygen in the reaction.

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If a space shuttle can travel 17,000 miles per hour, then it can travel 7599.68 meters per second.

Now,

  2.2369 miles per hour = 1 meter per second

  Hence,

      17000 miles per hour = (17000/2.2369) meter per second

                                           =  7599.68 meters per second.

Thus , from the above conclusion we can say that If a space shuttle can travel 17,000 miles per hour, then it can travel 7599.68 meters per second.

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The molarity of a solution of 0.5 mol of Cu([tex]NO_3[/tex][tex])_2[/tex]in 0.5 L water is  1 M.

molarity of a solution of 0.5 mol of Cu([tex]NO_3[/tex][tex])_2[/tex] in 0.5 L water

as per statement , we have got

moles of Cu(NO3)2 = 0.5 mol

volume of solution = 0.5 L

now:

we use the formulae of molarity written as M

molarity = moles of solute / volume of solution

molarity = 0.5/0.5

molarity = 1 M

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The volume of the liquid sodium is 121.64 L

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

With the above formula, we can obtain the volume of the liquid. Details below

Density = mass / volume

Thus,

Volume = mass / density

Volume of liquid = 1.13×10⁵ / 0.929

Volume of liquid = 121636.17 cm³

Divide by 1000 to express in liter

Volume of liquid = 121636.17 / 1000

Volume of liquid = 121.64 L

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