chemistry help best answer gets marked brainly

Chemistry Help Best Answer Gets Marked Brainly

Answers

Answer 1

Answer:

C. The final substance in beaker A is a pure substance while in Beaker B is a mixture

Explanation:

A pure substance is a substance that contains a constant and definite proportion of a single substance. Elements and compounds are the two known pure substances while mixtures are substances of different compositions mixed together.

In this question, two beakers; A and B are said to contain different substances. Beaker A contains elemental sulfur (S) that forms a yellow powder while beaker B contains sand and water. From the explanation above, the final substance in beaker A is a pure substance (element) while in beaker B is a mixture of sand and water.


Related Questions

The nutrition label for a can of soup states that each serving contains 2.0 g of fat, 7.8 g of carbohydrates, and 3.0 g of protein.
How many Calories are in each serving of the soup?
Type answer:

Answers

The number of calories in each serving of the soup would be 61.2 calories.

Calories calculation

To calculate the number of calories in each serving of the soup, you need to use the information provided on the nutrition label.

First, note that fat contains 9 calories per gram, while carbohydrates and protein contain 4 calories per gram. So, to calculate the number of calories in the soup, you can use the following equation:

Calories = (fat grams x 9) + (carbohydrate grams x 4) + (protein grams x 4)

Substituting the values from the nutrition label, we get:

Calories = (2.0 g x 9) + (7.8 g x 4) + (3.0 g x 4)

Calories = 18 + 31.2 + 12

Calories = 61.2

Therefore, there are approximately 61.2 calories in each serving of the soup.

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When comparing two similar chemical reactions, the reaction with
the smaller activation energy (Ea) will have…

Answers

The activation energy denoted by Ea is referred to as the minimum energy or the threshold energy required for a reaction to occur. When reactant molecules overcome the repulsion energy resulting in the collision of outer electrons by optimum kinetic energy. Higher the activation energy more easy for the reaction to take place.

When comparing two similar chemical reactions, the reaction with the smaller activation energy (Ea) because the activation energy is lower, the transition of the reactant molecules into the product species requires less energy. Accordingly, the pace of the response will be higher.

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A cup holds 125 grams of liquid water and 100 grams of ice. What is a reasonable mass for the water in the cup after the ice melts

Answers

A reasonable mass for the water in the cup after the ice melts would be 225 grams.

When the ice melts, it undergoes a phase change from a solid to a liquid, while the total mass of the system remains constant.

The mass of the water in the cup after the ice melts would be the sum of the initial mass of the liquid water and the mass of the ice.

Initial mass of liquid water = 125 grams

Mass of ice = 100 grams

The total mass of water after ice melts = Initial mass of liquid water + Mass of ice

Total mass of water = 125 grams + 100 grams = 225 grams

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Observe the phase-change diagram of an unknown substance below. What would be the meeting point of this substance? Can someone help with this? Thanks

Observe the phase-change diagram of an unknown substance below. What would be the meeting point of this

Answers

Answer:

im pretty sure its b

Explanation:

When any substance converts to liquid then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. The line along B represents the melting of unknown substance. Therefore the 72°C is melting point of the substance.

What is phase transition?

Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.

During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing.

The line along B represents the melting of unknown substance. Therefore the 72°C is melting point of the substance.

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maple syrup physical property description
-
-
-
-
-

Answers

Answer:

Maple syrup has nutraceutical potential given the macronutrients (carbohydrates, primarily sucrose), micronutrients (minerals and vitamins), and phytochemicals (primarily phenolics) found in this natural sweetener.

Explanation:

Consider these chemical equations.

N2(g) + 3H2(g) → 2NH3(g)
C(s) + 2H2(g) → CH4(g)
4H2(g) + 2C(s) + N2(g) → 2HCN(g) + 3H2(g)

Which equation(s) do you need to reverse in order to calculate the overall equation for the formation of HCN and H2 from NH3 and CH4? Check all that apply.

Answers

Answer:

A. N2(g) + 3H2(g) Right arrow. 2NH3(g)

B.C(s) + 2H2(g) Right arrow. CH4(g)

Explanation:

Answer:

a and b

Explanation:

second question

miultiplu second eq by 2

Which of the following statements about matter at
room temperature is true?
a. A solid has a definite volume, but a liquid's
volume can change.
b. Both a solid and a liquid Have a definite shape.
c. A solid has a definite shape, but a liquid's shape
can change.
d. Both a solid and a liquid have volumes that can
change.
e. A solid's shape can change, but a liquid has a
definite shape.

Answers

Answer: D

Explanation: If there was ice, the volume will change, if there was liquid (ex: water), it wouldn’t melt.

what does Le châteliers principle state?

Answers

Le Chatelier’s principal states: “A change in one of the variables that describe a system at equilibrium produces a shift in the position of the equilibrium that counteracts the effect of this change.”

Hope this helps!

how many grams of carbon are in 12 x 1023 atoms of carbon?

Answers

Answer:

23.9 grams carbon

Explanation:

One mole of carbon is 6.023 x 10^23 atoms of C.

If we calculate moles, we can use the molar mass of carbon (12 g/mole) to determine mass of 12x10^23 atoms of C.

(12x10^23 atoms of C)/(6.023 x 10^23 atoms of C/mole C)

moles C = 1.992 moles C

(1.992 moles C)*(12 g/mole C) = 23.9 grams carbon

if a material is ohmic what do you expect the reistance to be

Answers

If a material is ohmic, the resistance is expected to be constant. An ohmic material is a material that follows Ohm's law. In other words, the electric current flowing through the material is proportional to the potential difference or voltage applied across the material at a constant temperature and pressure.

The resistance of the ohmic material is defined by the ratio of the potential difference applied to the current flowing through the material. If a material follows Ohm's law, it is considered to be an Ohmic material. In ohmic materials, the resistance is constant, meaning it doesn't vary as the voltage and current change. If the current through an ohmic material is doubled, the voltage across the material is also doubled.

Hence, the resistance of the material remains constant. In contrast, the resistance of non-ohmic materials varies with voltage and current. Resistance is the degree to which an object opposes the flow of electrical current. The resistance of a material depends on its physical properties such as length, cross-sectional area, and temperature. The resistance of a conductor is defined by the ratio of the voltage applied across it to the current that flows through it. The unit of resistance is ohms (Ω).

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How many atoms of nitrogen are in 1.5 moles of aspartame?

Answers

Answer:

459.11 g.

Explanation:

hope this helps


Non-ferrous metal is NOT hardenable by heat treatment; it must
gain strength through a process such as tempering. Is this
statement TRUE or FALSE?
Group of answer choices
True
False

Answers

The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.

Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.

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A chemist is testing the quality of a wine produced by a vineyard. Which branch of chemistry might the chemist use? physical chemistry analytical chemistry inorganic chemistry organic chemistry

Answers

Answer:

organic chemistry

Explanation:

There are many branches of chemistry. Some of them are physical chemistry, analytical chemistry, inorganic chemistry and organic chemistry.

A chemist is testing the quality of a wine produced by a vineyard. It means he will test the structure, properties, and preparation of wine. All these tests comes under organic chemistry.

Hence, the correct option is (d) "organic chemistry"

Answer:

analytical chemistry

Explanation:

I took the test

I 3. How many moles of H, gas are made when 3.2 x 1023 molecules of HCl are used? 2A1 + 6HCI ----> 2AlCl3 + 3H2​

Answers

Answer:

0.265 moles

Explanation:

From the equation given;

Number of moles of HCl is 6 while number of moles of H is 3.

Now, we know from avogadro's number that 1 mole of a gas = 6.022 × 10^(23) molecules.

We want to find the number of moles of Hydrogen gas made when 3.2 x 10^(23) molecules of HCl are used.

Thus, converting this to moles gives;

(3.2 × 10^(23))/(6.022 × 10^(23)) = 0.53 moles

Thus, we can find the number of hydrogen gas by proportion as;

n = 3/6 × 0.53

n = 0.265 moles

Kennedy lists Heather's home. He noticed evidence of termites, and asked Heather about it. She said a pest control company solved the problem. What can Kennedy do to reduce the risk of misrepresentation

Answers

By taking these precautions, Kennedy can minimize the risk of being misled or misrepresented regarding the termite problem in Heather's home.

To reduce the risk of misrepresentation in this situation, Kennedy can take the following steps:

1. Request documentation: Kennedy can ask Heather to provide any documentation or proof of the pest control company's involvement. This may include receipts, invoices, or reports from the company.

2. Conduct an independent inspection: Kennedy can hire a professional inspector to assess the property for any signs of termite damage or infestation. This will help verify the accuracy of Heather's claim.

3. Research the pest control company: Kennedy can look up the pest control company that Heather mentioned to check its reputation and credibility. Reading reviews and checking for any licenses or certifications can provide additional assurance.

4. Consider a written agreement: If Kennedy decides to proceed with the purchase, he can include a clause in the agreement stating that Heather guarantees the absence of termites or any other pest-related issues. This way, he has legal protection if any misrepresentation is discovered later on.

By taking these precautions, Kennedy can minimize the risk of being misled or misrepresented regarding the termite problem in Heather's home.

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___________ ________ are groups of non-metals that combine to form a charged molecule

Answers

Answer:

Anions or negatively-charged ions

Explanation:

Question 11
Which formula represents a hydrocarbon?


C₂H6
C₂H5OH
C₂H5Cl
C₂H6O

Answers

Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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The temperature in a beaker of water is 50 degrees Celsius. Kiley puts the water into a freezer. After a few minutes, she measures the temperature again. It is now 10 degrees Celsius. How did the water particles change

Answers

Answer:

This question lacks options; the options are:

A) They moved more freely

B) They moved closer together.

C) The average speed increased.

D) The average kinetic energy increased

The answer is B

Explanation:

The water in the beaker is described to be in a liquid state of matter. Its temperature decreases from 50°C to 10°C when placed in a freezer by Kiley. This means that heat is gradually being lost as the liquid water undergoes freezing into a solid state.

When water in a liquid state is freezed, it's molecules, which were moving more freely begin to move closer together because the speed at which the particles in the liquid state moved has been reduced.

Scientist at the CDC (Center for Disease Control) in Atlanta, GA are currently developing and testing new treatments and vaccines for the coronavirus. What kind of research are they conducting?

Answers

Answer:

Applied research

Explanation:

The process of developing a new vaccine involves the use of known scientific theories to address specific problems. Here, the outcome of several basic research are put into use to arrive at a targeted outcome. This outcome/product can be continuously modified (if it shows early promise) until the desired effect is achieved and if no "promise" is discovered at critical points of this research, work on this theory (for this research) is suspended another theory is pursued.

This process (described above) in which scientists continuously develop new treatments and/or vaccines and continuously subject it to testing until the desired effect is achieved can be referred to as Applied research.

Help ASAP pls will make brianlist

Help ASAP pls will make brianlist

Answers

Answer:a+b

Explanation:

c) Can two electrons have same set of all four quantum numbers? Justify.​

Answers

It is not possible for two electrons to have the same set of all four quantum numbers in an atom, as it would violate the Pauli exclusion principle.

According to the Pauli exclusion principle, no two electrons in an atom can have the same set of all four quantum numbers. The four quantum numbers used to describe an electron's state are the principal quantum number (n), the azimuthal quantum number (l), the magnetic quantum number (m), and the spin quantum number (s).

The principal quantum number (n) determines the energy level of an electron and can have integer values starting from 1. The azimuthal quantum number (l) determines the shape of the electron's orbital and can have values from 0 to (n-1). The magnetic quantum number (m) determines the orientation of the orbital and can range from -l to +l. The spin quantum number (s) describes the spin of the electron and can have two possible values, +1/2 or -1/2.

Since each electron in an atom must occupy a unique set of quantum numbers, they must differ in at least one of the four quantum numbers. This ensures that no two electrons have the exact same quantum state.

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Compared with halogens, the alkali metals in the same period has
electronegativity
the same
O larger
O smaller

Answers

Alkali metals have the lowest electronegativities, while halogens have the highest.

3.0 mol Na reacts with 1.4 mol
F2 according to the equation below:
2Na+ F₂ → 2NaF

How many moles of NaF form
from 3.0 mol Na?

Answers

The number of moles of NaF that will be produced from 3moles of Na is 3 moles.

How to calculate number of moles?

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, sodium reacts with fluorine as follows:

2Na+ F₂ → 2NaF

Based on the above equation, 2 moles of Na will produce 2 moles of NaF

This means that 3 moles of Na will produce 3 moles of NaF.

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How many liters of water is necessary to make a 1.14 M solution with 5.10 mol KNO3?

Answers

4.47 liters of water.

How is blood different after it is pumped through the gills? Select all that apply.

It has less carbon dioxide than

when it entered the gills.

It has more oxygen than when

it entered the gills.

It has more carbon dioxide

than when it entered the gills.

It has less oxygen than when it

entered the gills.

Submit

Answers

Answer:

It has less carbon dioxide than when it entered the gills, it has more oxygen than when it entered the gills

Explanation:

there is none i just found the answer =_=

Blood is different after it is pumped through gills as it has less carbon dioxide and more oxygen when it enters the gills through the process of diffusion.

What is diffusion?

Diffusion is defined as the process of movement of molecules which takes place under concentration gradient. It helps in movement of substances in and out from the cell.The molecules move from lower concentration region to a higher concentration region till the concentration becomes equal.

There are 2 main types of diffusion:

1) simple diffusion-process in which substances move through a semi-permeable membrane without the aid of transport proteins.

2) facilitated diffusion- It is a passive movement of molecules across cell membrane from higher concentration region to lower concentration.

There are 2 types of facilitated diffusion one is osmosis and dialysis.

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What is the molar concentration a a 12 % sodium chloride solution (MW 58.5)

Answers

The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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To find the range, identify the largest value and
the smallest value in the data set and find the
difference.
1, 2, 3, 3, 3, 4, 4, 4, 5, 7
What is the range of the data?
A. The largest value is 7 and the smallest value is 1. Find
the difference. 7-1-6 The range is 6.
B. The smallest value is 1. So the range is 1.
C. The largest value is 7. So the range is 7.

Answers

Answer:

A. The largest value is 7 and the smallest value is 1. Find the difference. 7 - 1 = 6.

Explanation:

bond that forms between charged ions
A.carbon-14
B.covalent
C.ionic

Answers

Answer: Ionic Bond

Explanation: They form when the cation and the anion have opposite charges, and attract each other

bond that forms between charged ions A.carbon-14 B.covalent C.ionic

Calculate the number of molecules of sulphur S8 in 8 gram of solid Sulphur​

Answers

Answer:

12gram

Explanation:

test told me

Can more than one type of reaction occur at the same time?

Answers

Answer: yes, it depends on the substance though

Explanation:

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