A student performed the following steps in an investigation:


1. Add a few drops of red food coloring to 50 mL of water in a beaker.


2. Stir the contents of the beaker using a glass stir rod.


3. Add 20 mL of yellow vegetable oil.


4. Stir the contents of the beaker using a glass stir rod.


5. Leave the beaker undisturbed for 24 hours.


Which of the following statements about the investigation is most accurate?

A The student made a compound out of pure substances and then made a homogeneous mixture.The student made a compound out of pure substances and then made a homogeneous mixture.
B The student made a solution and then a heterogeneous mixture.The student made a solution and then a heterogeneous mixture.
C The student made a homogeneous mixture and then made a pure substance through a chemical reaction.The student made a homogeneous mixture and then made a pure substance through a chemical reaction.
D The student made a heterogenous mixture and then stirred it until it was a homogeneous mixture.The student made a heterogenous mixture and then stirred it until it was a homogeneous mixture.

Answer:0

Explanation:

Answer:

it's sensitivity

Explanation:

because it's the action of sensing and reacting to something

also it was process of elimination

Answer:

aluminum?

Explanation:

This problem is providing us with the mass of solid sodium chloride and the volume of water it was dissolved in. Thus, after diluting it, the volume of the stock solution was required and found to be 60. mL according to:

In chemistry, when we are given a stock solution with specified volume and concentration, one is able to dilute it in order to use it for a specific purpose. This, by holding the number of moles constant, one can write:

\(C_1V_1=C_2V_2\)

Where the subscript 1 stands for the stock solution and 2 for the diluted one. Thus, one first calculate the initial concentration with the mass and volume:

\(M=\frac{70.13g/(58.44 g/mol)}{0.400L}=3.00M\)

Next, we solve for the volume of the stock solution, V1, as follows:

\(V_1=\frac{C_2V_2}{C_1}\)

Finally, we plug in the given data to obtain the result:

\(V_1=\frac{1.2M*150mL}{3.00M}\\ \\V_1=60.mL\)

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Answer:

b refraction

Explanation:

i saw on nasa's website lol

The force exerted by the gas on the piston in newtons (N) is 38503.5N.

Pressure is the amount of force that is applied over a given area divided by the size of this area.

This means that the pressure can be calculated as follows:

P = F/A

Where;

According to this question, in a car piston, the pressure of the compressed gas (red) is 5.00 atm. If the area of the piston is 0.0760 m², the force exerted can be calculated as follows:

506625N/m² = F/0.0760m²

F = 38503.5N

Therefore, the force in Newtons is 38503.5N.

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The pH of a solution is a measure of the activity of hydrogen ions (H+) in the solution. pOH is a measure of the activity of hydroxide ions (OH-) in a solution.

To calculate pH and pOH, when [H+] = 0.025 M, we can use the equation pH + pOH = 14. First, we calculate pH. Since [H+] is given, we can calculate pH directly from [H+] using the equation pH = -log[H+]. Plugging in [H+] = 0.025 M gives pH = -log(.025) = 2.6.

Next, we can calculate the pOH. Since pH + pOH = 14, we can calculate pOH by subtracting pH from 14. Plugging in pH = 2.6 gives pOH = 14 - 2.6 = 11.4. Therefore, the pH and pOH of a solution with [H+] = 0.025 M are 2.6 and 11.4, respectively.

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Both Ba and Sr belong to the same group of elements in the periodic table Oxygen and selenium both belong to group 16 of the periodic table Nitrogen and arsenic belong to the same periodic table group of elements.

Ba and Sr both have two valence electrons in their outermost shell and belong to the same group of elements in the periodic table, the alkaline earth metal group.

This similarity in electron arrangement leads to similar chemical properties.

Nitrogen and arsenic belong to group 15 of the periodic table, also known as the nitrogen group. Both elements have five valence electrons in their outermost shell, and their shared electron arrangement contributes to similar chemical properties such as their ability to form compounds with three other atoms.

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9.0 gram of NO can be produced from 12g of NH3 and 12 gram of O2 as per the balanced chemical reaction,

                        4NH3 + 5O2 ----> 4NO + 6H2O

The balanced chemical reaction is,

4NH3 + 5O2 ----> 4NO + 6H2O

Molar mass of NH3 is 17.03 g/mole

Mole NH3 = (12 g/17.03 g/mole) is 0.7046 mole

Molar mass of O2 is 32 g/mole

Mole O2 = 12 g/32 g/mole = 0.375 mole

The mole ratio of NH3 to O2 is 4:5. It means that 4 moles of NH3 need 5 moles of O2 for reaction to produce the given products. If we have 0.7046 mole of NH3,

The mole of O2 needed for reaction = (5/4) x 0.7046

                                                             = 0.8808 mole.

The amount of O2 needed for reaction with NH3 is 0.375 mol. so O2 is a limiting reactant.

The mole of NH3 required to react with 0.375 mole O2 is (4/5) x 0.375

                                                                                               = 0.3 mole.

So, NH3 is in excess of (0.7046-0.3) = 0.4046 mole. It will remain unreacted after the reaction unless more O2 is added for further reaction to produce more of the products.

The mass of NO  = (mole NO) x (molar mass of NO)

                            = 0.3 mole x 30.01 g/mole

                            = 9.003 g or approx. 9.0 g

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The correct question is,

 4NH3 + 5O2 ----> 4NO + 6H2O

How many grams of NO can be produced from 12 g of NH3 and 12 g of O2?

Answer:

A.

Explanation:

Im taking the test right now and I have one of those in my living room

Answer:

Its a

Explanation:

Look up  ottoman <3 c :

Answer:

V = volume, usually in Litres

n = number of moles, in mol

R = the gas constant, which should be 8.33 J*K /mol

T = is the temperature, but in kelvin (if its in Celcius, you convert it)

The specific gravity of the combined mixture will be 0.98.

In order to prepare a base for a medicated lotion, we will be combining 1000 ml of water, 500 ml of glycerin (sg = 1.25) and 1500 ml of alcohol (sg = 0.81). The specific gravity of the combined mixture can be calculated using the equation SG = (m1V1 + m2V2 + m3V3) / (V1 + V2 + V3). In this equation, m1, m2, and m3 represent the mass of water, glycerin, and alcohol respectively; V1, V2, and V3 represent the volume of water, glycerin, and alcohol respectively.

Using the above equation, the specific gravity of the combined mixture can be calculated as follows: SG = (1000 x 1 + 500 x 1.25 + 1500 x 0.81) / (1000 + 500 + 1500) = 0.98.

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The correct equation for the balanced reaction between chromium (Cr) and chlorine (Cl₂) to form chromium chloride (CrCl₃) is:

2 Cr + 3 Cl₂ → 2 CrCl₃

In this reaction, 2 atoms of chromium react with 6 atoms of chlorine (3 molecules of Cl₂) to produce 2 molecules of chromium chloride. This equation is balanced because there are equal numbers of each type of atom on both sides of the equation.

It is important to have a balanced reaction in order to accurately represent the quantities of reactants and products involved in the reaction.

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Explanation:

Magnets actually do both attract and repealto each other. Magnets repeal similar poles where as attract opposite poles.

In order for an element to transform into a new element, the particles which must be released is the protons.

This is referred to as subatomic particle which is present in the nucleus and is positively charged. The proton and the electron must be equal in a neutral atom.

The proton is also equal to the atomic number which is why it is the particle which can be added removed to change the element. It is because a change in atomic number will automatically mean a change in the element which therefore makes it the correct choice.

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In order for an element to transform into a new element, the particles which must be released to change the number of protons is: beta particles.

A beta particle can be defined as an isotope which typically undergoes radioactive decay through the emission of a radiation with a negative one (-1) charge. This ultimately implies that, an atom of neutron becomes a proton and an electron (₀e⁻¹), and an atom of proton also becomes a neutron and a positron (⁰⁻e₁⁺) during beta decay.

Based on scientific information and records from radioactivity, we can reasonably infer and logically deduce that an atom of proton becomes a neutron and a positron during a beta decay as shown by this chemical reaction:

³H₁  ----->   ³He₂ + ⁰e₋₁ + ⁰v₀

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The molarity of the  [K2SO4] Potassium Sulfate solution is 0.356 M.

The molarity of a solution can be calculated by dividing the number of moles of solute by the volume of the solution in liters. In this case, we have a solution of Potassium Sulfate (K2SO4) with a concentration of 6% by mass.

To find the molarity, we need to convert the mass percent to grams of K2SO4 per liter of solution.

Let's assume we have 100 grams of the solution. Since the concentration is 6%, we have 6 grams of K2SO4.

The next step is to find the number of moles of K2SO4. To do this, we need to know the molar mass of K2SO4. The molar mass of K2SO4 is calculated by adding up the atomic masses of the elements: 2 atoms of potassium (K), 1 atom of sulfur (S), and 4 atoms of oxygen (O).

The atomic masses are:  Potassium (K) = 39.10 g/mol
                                                 Sulfur (S) = 32.07 g/mol
                                             Oxygen (O) = 16.00 g/mol

Using these values, we can calculate the molar mass of K2SO4: (2 × 39.10 g/mol) + 32.07 g/mol + (4 × 16.00 g/mol) = 174.26 g/mol

Now, we can calculate the number of moles of K2SO4: 6 g / 174.26 g/mol = 0.034 moles of K2SO4

Finally, to find the molarity (m), we divide the number of moles by the volume of the solution in liters. The density of the solution is given as 1.047 g/mL, which means 1 mL of solution has a mass of 1.047 grams.

To find the volume of the solution in liters, we divide the mass of the solution (100 grams) by the density: 100 g / 1.047 g/mL = 95.55 mL = 0.09555 L

Now we can calculate the molarity: 0.034 moles / 0.09555 L = 0.356 M

Therefore, the molarity of the  [K2SO4] Potassium Sulfate solution is 0.356 M.

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NAD+/NADH moves energy by gaining or losing electrons, in the form of hydrogen. NAD+ (nicotinamide adenine dinucleotide) and NADH (reduced form of NAD+) are involved in redox reactions, specifically in the transfer of electrons during cellular respiration.

NAD+ acts as an oxidizing agent by accepting electrons, while NADH acts as a reducing agent by donating electrons.

During the process of cellular respiration, glucose is broken down, and electrons are transferred to NAD+, resulting in the formation of NADH. NADH then carries these electrons to the electron transport chain, where they are ultimately used to generate ATP (adenosine triphosphate), the energy currency of cells.

In this electron transfer process, NAD+ gains electrons to form NADH, and vice versa. The movement of electrons between NAD+ and NADH is directly involved in the transfer of energy, as the electrons carry energy that is ultimately used to produce ATP.

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a) The unknown element that Kevin has is a metal.

Since the unknown element conducts heat, burns with a colored flame, and has a shiny surface- these are the characteristic properties of metals.

b)The piece of evidence that helped to decide was the conduction of heat, orange-colored flame, and shiny surface.

The information provided states that the element is a good conductor of heat as the other end gets heated and burns with an orange-colored flame and also has a shiny surface. These properties confirm that the element is Metal.

Properties of metal-

Properties of non-metal-

From the properties stated it is confirmed that the unknown element is a metal.

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In acetic acid molecule, there are seven sigma bonds and one pi bond.

We know that the chemical bonds that are found in a substances are responsible for the joining of the atoms of the substance together. This implies that a bond is said to be formed any time that two atoms have been joined together in a molecule.

In this case, we have a molecule of acetic acid. There are several bonds that are formed as the atoms that form the acetic acid are being joined together. These bonds fall into two categories, the sigma bonds and the pi bonds.

The sigma bond are the bonds that are single bonds while the pi bonds are the bonds that are multiple bonds, we can know the sigma and the pi bonds by a close examination of the molecule as shown.

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Answer:

b

Explanation:

Answer:

D. the quantity of heat that is required to raise 1 g of the sample by 1°C (or Kelvin) at a given pressure

Explanation:

Answer:

The answer is 2.53e-5

Explanation:

Oxidation Numbers. It is often useful to follow chemical reactions by looking at changes in the oxidation numbers of the atoms in each compound during the reaction. Oxidation numbers also play an important role in the systematic nomenclature of chemical compounds.

brainliest please

Answer:

The valence electron configuration determines the group to which an element belongs to.

Explanation:

The valence electron configuration of an atom of an element refers to the number of electrons in that atoms outermost shell.

The valence electron configuration is related to the group number of an element in that the number of electrons in the valence shell of an atom of an element determines the group to which an element belongs to. For example, all elements having one valence electron belong to group IA of the periodic table. Similarly, all elements having seven valence electrons belong to group VIIA of the periodic table.

This is because, since the reactivity of an element is related to its ability to either gain or lose a certain number of electrons in its valence shell, elements having same number of valence electrons have similar chemical properties.

The translational correspondence between the mRNA and tRNA molecules is codon and anticodon.

The codon and anticodon of a polypeptide are nucleotide triplets that identify an individual amino acid. Genetic information must be stored as a nucleotide sequence on DNA or mRNA molecules in a specific way to build proteins. That particular set of rules is known as the genetic code. A codon is a grouping of three nucleotides, most frequently found on mRNA. Anticodons are found in tRNA molecules.

The main difference between a codon and an anticodon is that a codon isae language used to represent an amino acid on mRNA molecules, whereas an anticodon is the complementary nucleotide sequence of the codon on tRNA molecules.

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Answer:

Crayons use wax and Oil pastels use non-drying oil and wax. Besides the composition of the colours, there is a huge difference in how a wax crayon and an oil pastel works. ... Crayons, don't colour your hands. Well, most crayons don't.

Explanation:

what's crayons are softer and they smudge because they have more oil pastels in them plastic crayons are harder and they don't intend to smudge.

Explanation:

two compounds because element is the very smallest part of any mixture

Answer:

it would be OA that is negatively charged

Step 1

The reaction:

CaCO3 + heat => CaO + CO2 (completed and balanced)

-----------------------

Step 2

Information provided:

Actual yield = 0.53

The sample of water containing 0.004 ml of oxygen in 2000 ml of water is equivalent to 2× 10⁻⁴ volume percentage of the solution.

Volume percentage of an aqueous solution is the ratio of the  volume of the dissolved substance to the total volume of the solution. Volume percentage is thus, used to express the concentration of the solution in terms of its volume.

The other terms used to express the concentration of a solution are molarity, normality, mass percentage, ppm etc.

Given the total  volume of the water sample = 2000 ml

volume of oxygen dissolved in water = 0.004 ml

volume percentage = volume of oxygen / total volume ×100

                                 = 0.004 /2000 ×100 = 2× 10⁻⁴

Therefore, 2000 ml water sample containing 0.004 ml of sample is equivalent to 2× 10⁻⁴ volume percentage.

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