The terms included in the chemistry are Molecules , Atoms, Reactions , Equations, Processes.
In chemistry, there are several important terms that are used in order to describe reactions, equations, and processes. These terms include:
-Molecules: A group of atoms bonded together.
-Atoms: The smallest unit of an element that can take part in a chemical reaction.
-Reactions: The process of one or more substances changing into new substances.
-Equations: A mathematical representation of a chemical reaction that states the reactants and products involved.
-Processes: A set of operations performed in order to produce a desired result.
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A cube of moist soil has a water content of 25%, a specific gravity of solids of 2.7, a total weight of 215 lbs, and a volume of 2 ft. Calculate the saturation, total unit weight, void ratio and porosity.
The saturation is 33%, the total unit weight is 107.5 lbs/ft^3, the void ratio is 0.43 and the porosity is 30%.
To calculate the saturation, we need to find the weight of water in the soil, which is 25% of the total weight of 215 lbs. So, the weight of water is 25/100 * 215 lbs = 53.75 lbs.
Next, we find the weight of solids in the soil, which is 215 lbs - 53.75 lbs = 161.25 lbs.
The saturation (S) is the ratio of the weight of water to the weight of solids in the soil and is calculated as follows:
S = 53.75 lbs / 161.25 lbs = 0.33 or 33%.
The total unit weight of the soil can be calculated using the following formula:
γ = (W_water + W_solids) / V
where W_water is the weight of water, W_solids is the weight of solids, and V is the volume of the soil.
Substituting the values, we get
γ = (53.75 lbs + 161.25 lbs) / (2 ft^3) =
= 215 lbs / (2 ft^3) = 107.5 lbs/ft^3
The void ratio (e) is the ratio of the volume of voids in the soil to the volume of solids in the soil, and can be calculated as follows:
e = V_voids / V_solids = (V - V_solids) / V_solids = (V - W_solids / γ_solids) / (W_solids / γ_solids)
Substituting the values, we get
e = (2 ft^3 - 161.25 lbs / 2.7) / (161.25 lbs / 2.7) = 0.43
Finally, the porosity (n) is the ratio of the volume of voids in the soil to the total volume of soil and is given by:
n = V_voids / V = e / (1 + e) = 0.43 / (1 + 0.43) = 0.43 / 1.43 = 0.30 or 30%.
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Calcium Carbonate + Nitricacid-> calciumnitrate +water+ carbondioxide
Answer: CaCO3 + 2HNO3 -> Ca(NO3)2 + H2O + CO2
Explanation:
(NEED HELP ASAP) Which statement is true about the particles of a solid when the solid changes into a liquid?
-They stop vibrating.
-Their kinetic energy increases.
-They move closer to each other.
-The attractive force between them increases.
When a solid changes into a liquid, the particles of the solid move farther apart and gain kinetic energy. Therefore, the statement that is true about the particles of a solid when the solid changes into a liquid is: their kinetic energy increases.
What is Kinetic Energy?
It is a scalar quantity and is dependent on the mass and velocity of an object. The formula for kinetic energy is:
Kinetic energy = (1/2) * mass * velocity^2
In a solid, the particles are tightly packed and vibrate in a fixed position. When the solid is heated or the pressure is reduced, the kinetic energy of the particles increases and they begin to vibrate faster and move slightly away from their fixed positions. This causes the solid to start melting and the particles begin to slide over each other, forming a liquid. Therefore, the particles of the solid move apart and gain kinetic energy when the solid changes into a liquid.
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property of nucleotide bases that affects the three-dimensional structure of nucleic acids is: A. their weakly acidic nature. B. their absorption of UV light at wavelengths above 280 nm. C. their hydrophilic nature. D. their existence in tautomeric forms depending on pH.
The property of nucleotide bases that affects the three-dimensional structure of nucleic acids is: D. their existence in tautomeric forms depending on pH.
D. their existence in tautomeric forms depending on pH.
Nucleotide bases can exist in different tautomeric forms, which are structural isomers of a compound that differ only in the position of protons and double bonds.
This property affects the hydrogen bonding between base pairs and thus influences the overall three-dimensional structure of nucleic acids.
Summary: Tautomeric forms of nucleotide bases, dependent on pH, impact the three-dimensional structure of nucleic acids.
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What is the Ka of a 1.9 ~ 10-2 M
solution of carbonic acid (H2CO3)
with a pH of 3.88?
Ka = [ ? ] × 10!?)
Helllllp
Answer:
Ka = 9.2x10⁻⁷
Explanation:
The equilibrium of carbonic acid in water is:
H₂CO₃ ⇄ HCO₃⁻ + H⁺
Where Ka is defined as:
Ka = [HCO₃⁻] [H⁺] / [H₂CO₃]
The equilibrium concentration of the species is:
[H₂CO₃] = 1.9x10⁻² - X
[HCO₃⁻] = X
[H⁺] = X
As pH is -log[H⁺]
3.88 = -log[H⁺]
1.318x10⁻⁴ = [H⁺] = X
Replacing:
[H₂CO₃] = 1.9x10⁻² - 1.318x10⁻⁴ = 1.8868x10⁻²
[HCO₃⁻] = 1.318x10⁻⁴
[H⁺] = 1.318x10⁻⁴
Replacing in ka equation:
Ka = [1.318x10⁻⁴] [1.318x10⁻⁴] / [1.8868x10⁻²]
Ka = 9.2x10⁻⁷Answer: 9.2 x 10^-7
Explanation:
The pH at the equivalence point in any titration is the pH of the salt solution formed. At the equivalence point of the titration, the solution contains sodium benzoate and water. The passage states that benzoic acid is a weak acid; therefore, its conjugate base, the benzoate anion, is a stronger base than OH- and reacts with water to produce OH- and undissociated benzoic acid. The resulting solution then has a pH > 7, because of the hydroxide ions produced by this reaction. The reaction of an ion such as benzoate ion with water is called hydrolysis.
A. < 4
B. > 4 and < 7
C. = 7
D. > 7
Answer:
D. > 7
Explanation:
Benzoic acid, HX, is a weak acid that reacts with OH- as follows:
HX + OH- → X- + H2O
Where X- is produced, the conjugate base of benzoic acid.
As benzoic acid is a weak acid, benzoate ion is a strong base. A strong base has pH > 7. Right option is:
D. > 7
You work at a cardboard box making company, and the formulation chemist has created a new pulp for making the cardboard used in the boxes. The pulp is cheaper, but when it is made into a standard cardboard box, the box permanently bends under much less weight than the prior pulp formulation. Assuming your boxes still needs to meet the same weight specifications as the previous pulp formulation, what would you do to determine if you could still save money
What you should do to determine if you could still save money is: If the cost for using additional cheaper pulp in the thicker boxes is lesser.
CardboardThe following are the step to follow in order to determine if you could still save money.
Check the measurement or measure the new cardboard yield strength so as to prevent deformation.Make use of the right formulas for deformable bodies Find out or determine the thickness in which the cardboard must be created.Money can be saved when the cost for using additional cheaper pulp in the thicker boxes is lesser than the cost of using less of the additional costly pulp in the thinner boxes.Therefore what you should do to determine if you could still save money is: If the cost for using additional cheaper pulp in the thicker boxes is lesser.
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The initial buret reading for a titration using 0.1524 M of barium chloride was 1.88 mL. The buret reading at the endpoint was 42.07 mL. Calculate the volume (mL) of barium chloride used in the titration to the correct number of decimal places. Calculate the answer first, then round if necessary.
Answer:
4
Explanation:
23456 trust me
Water will expand more than ____________.
door
air
juice
Answer:
door
Explanation:
door I guess..................
what is generally true about the compressibility of solids?
Answer:
That it is hard to compress
Explanation:
2 QUESTIONS HELP NEEDED FAST 50 POINTS "NO FARMERS"
explanation not required BUT i want u to say the letter for which answer it is
Which clue would indicate that the lac operon is off?
Responses
A The repressor protein is attached to the DNA.
B The lac operon genes are exposed on the DNA.
C RNA polymerase is attached to the DNA.
D Lactose is present in the cell.
QUISTION 2 Refer to these diagrams to answer the question.
Which statement best describes how a cell can effectively use its resources with regard to the lac operon gene?
Responses
The cell blocks the expression of lactase at all times.
The cell only expresses lactase when lactose is absent.
The cell only expresses lactase when lactose is present.
The cell expresses lactase constantly.
Answer:
hope its helps!
Explanation:
The repressor "turns off" the lac operon genes by binding to the operator, which is located between the promoter and the lac genes. This prevents RNA polymerase from binding to the promoter and transcribing the genes. The lac operon genes can be found in the bacterium Escherichia coli. The purpose of the lac operon is to enable the bacteria to metabolize lactose when it is present in the environment. The lac operon consists of three genes, lacZ, lacY, and lacA, which encode enzymes that break down lactose into glucose and galactose.
As the repressor protein is attached to the DNA it indicates that the lac operon is off.A cell can effectively use its resources with regard to the lac operon gene by expressing lactase when lactose is present.
What is DNA?DNA is a hereditary material which is present in human beings as well as all other living organisms. Every cell which is present in an organism's body has DNA which is the same. Most of the DNA is situated in the cell's nucleus and small amount of it can be found in the cell's mitochondria as well.
Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.
DNA bases are capable of pairing up with each other. Adenine pairs with thymine and guanine pairs up with cytosine .Each base is also attached to a sugar molecule and a phosphate group. A base, phosphate sugar are together called as nucleotides.
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If an atom has 15 protons and how many electrons will be gained when this atom forms an ion?
Answer:
What are the Answer choices
10) Air masses are different in many ways. Which of these is NOT different?
a) Atmospheric pressure
b) Temperature
c) Ratio of oxygen/nitrogen
d) Moisture contents
Answer:D. Ratio of oxygen/nitrogen
Explanation: the ratio will never change no matter the air pressure!
2 of 3
5. The mesosphere is found at 50 to 85 km above Earth's surface. (5 points)
Answer:
Mesosphere. This layer extends from around 31 miles (50 km) above the Earth's surface to 53 miles (85 km). The gases, including the oxygen molecules, continue to become denser as one descends. As such, temperatures increase as one descends rising to about 5°F (-15°C) near the bottom of this layer.
Explanation:
I hope this helpful♡♡ plssplss pa brainliest po ako
10. What do you have to do to the coefficients of equation I below to get to equation II?
i. 2 SnO2 + 4 H2 2 Sn + 4 H2O
ii. SnO2 + 2 H2 Sn + 2 H2O
a) Both equation I and II are balanced, but equation I is the correct way to write the balanced equation.
b) Can you divide equation II by another factor and still have it be correct? Why or why not?
c) In a complete sentence, write down a method you could use to determine if an equation is written in the correct way.
1. We have to divide the coefficient of equation I by 2 to get equation II.
a. Both equations are balanced but equation II is the correct way to write a
balance equation.
b. It will be correct if we divide equation II coefficient by another factor
but we will get fractions as coefficient. For example
\(\frac{1}{2}\)SnO₂ + H₂→ \(\frac{1}{2}\)Sn + H₂O
c. The correct method is checking if the number of moles of element on
the reactant side is same as the those on the product side. And the
conventional way is making sure the coefficients are whole numbers.
i. 2SnO₂ + 4H₂ → 2 Sn + 4H₂O
ii. SnO₂ + 2H₂→ Sn + 2H₂O
We have to divide the coefficient of equation I by 2 to get equation II.
Both equations are balanced but equation II is the correct way to write a
balance equation.
If we divide the coefficients of equation II by another number, we will not
get a whole number coefficients. The coefficient will be fractions , it will
be correct but its not conventional.
The best method to know if equation is written the correct way is checking
if the coefficient are in the lowest whole number factors.
we also have to check if each moles of elements found in the reactant is
the same in the product side.
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Answer:We have to divide the coefficient of equation I by 2 to get equation II.
Explanation:
The brightness of a star is determined by _____.
A. color
B. temperature
C. season
D. distance from the Earth
E. size
Answer:
Size and Temperature or E & B
Explanation:
Answer:
it is E and b I hope this helps you
What are 3 ways you know something is living
elect the correct answer.
Which atom or ion is the largest?
A.
K
B.
K+
C.
Ca
D.
Ca2+
E.
Li
Answer:
Ca2+ I'm not sure hahahahhahah
Answer:
Ca
hope it is helpful..
a vehicle accelerates with 0.4 m/s. calculate tue time taken by the vehicle to increase its speed from 20m/s to 40m/s.
Answer:
\(\huge\boxed{\sf t = 50 \ seconds}\)
Explanation:
Given data:Acceleration = a = 0.4 m/s²
Initial Speed = \(V_i\) = 20 m/s
Final Speed = \(V_f\) = 40 m/s
Required:Time = t = ?
Formula:\(\displaystyle a =\frac{V_f-V_i}{t}\)
Solution:Rearranging formula for t
\(\displaystyle t =\frac{V_f-V_i}{a} \\\\t = \frac{40-20}{0.4} \\\\t = \frac{20}{0.4} \\\\\boxed{t = 50 \ seconds}\\\\\rule[225]{225}{2}\)
Answer:
50 seconds
Explanation:
Equation used :
v = u + at
Given :
⇒ a = 0.4 m/s²
⇒ u = 20 m/s
⇒ v = 40 m/s
Solving :
⇒ 40 = 20 + 0.4t
⇒ 0.4t = 20
⇒ t = 20/0.4
⇒ t = 50 seconds
fill in the blank. A species containing a negatively charged C atom is called a(n) _____ and such a species will act readily as a _____.
A species containing a negatively charged C atom is called a carbanion, and such a species will act readily as a nucleophile
What exactly is a carbanion ?A carbanion can be characterized as an adversely charged particle in which a carbon iota displays trivalence (suggesting it shapes a sum of three bonds) and holds a conventional negative charge whose size is at any rate - 1. Any individual from a class of natural mixtures where a negative electrical charge is found overwhelmingly on a carbon iota.
Nucleophiles :A nucleophile is a synthetic animal types that structures bonds by giving an electron pair. All particles and particles with a free sets of electrons or possibly one pi bond can go about as nucleophiles. Since nucleophiles give electrons, they are Lewis bases.
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Compute the mass of KI needed to prepare 500 mL of a 0. 750 M solution
The mass of KI needed to prepare 500 mL of a 0. 750 M solution is 62.25 grams
To compute the mass of KI needed to prepare 500 mL of a 0.750 M solution, use the formula:
Molarity (M) = moles of solute / volume of solution in liters
First, convert the volume to liters: 500 mL = 0.5 L
Next, rearrange the formula to find the moles of solute:
moles of solute = Molarity × volume of solution in liters
moles of KI = 0.750 M × 0.5 L
moles of KI = 0.375 moles
Now, find the molar mass of KI (Potassium Iodide):
K (Potassium) = 39.10 g/mol
I (Iodine) = 126.90 g/mol
Molar mass of KI = 39.10 g/mol + 126.90 g/mol = 166.00 g/mol
Finally, calculate the mass of KI needed:
mass of KI = moles of KI × molar mass of KI
mass of KI = 0.375 moles × 166.00 g/mol
mass of KI = 62.25 g
Therefore, you will need 62.25 grams of KI to prepare 500 mL of a 0.750 M solution.
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in the electrolysis of molten libr, which product forms at the cathode? a. h2(g) b. o2(g) c. li(l) d. br2(g)
The electrolysis of molten LiBr involves the oxidation of Li+ ions at the anode and the reduction of Br- ions at the cathode. The oxidation of Li+ ions at the anode produces oxygen gas (O2(g)), while the reduction of Br- ions at the cathode produces lithium metal (Li(l)).
What is electrolysis?Electrolysis is a process used to separate elements or compounds by using electric current. It works by passing an electric current through a liquid or solution containing ions, which causes the ions to break down into their component atoms or molecules. The process involves the transfer of electrons between the negative and positive electrodes in the solution, forming new compounds and releasing energy. Electrolysis is commonly used in industry for the production of certain chemicals, in the purification of metals, and in the treatment of wastewater. It can also be used to electroplate metals and to produce jewelry and other artistic items.
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0.630 moles of sodium chloride are how many grams (with calculation)
Answer:
Heyaa!! Im Pinky and Im here to inform you that your answer is...
Explanation:
!!! 36.8189451 Grams !!!
Have an amazing day!!!
~Pinky~!!
Which of the following is a true statement?
Erosion is a biological change
Erosion is a chemical change
Erosion is a physical change
Erosions are changes made by humans
Answer:
Explanation:Erosion is a physical change
When a hydrocarbon burns in air what component of air reacts?
Answer:
oxygen level reduces
Explanation:
because oxygen supports burning
1) El CO2 que los astronautas exhalan se extrae de la atmósfera de la nave espacial por reacción con KOH según la reacción: CO2 (g) + 2 KOH (l) → K2CO3 (s) + H2O (l) a) Cúantos gramos de CO2 se pueden extraer con 500 g de KOH ? b) Cuántos gramos de agua se producen? 2) Cuando se hacen reaccionar hidrógeno y nitrógeno se produce amoniaco, un fertilizante benéfico para las plantas. ¿Cuántos moles de hidrógeno se requieren para que reaccionen con 12.75 moles de nitrógeno? La reacción es la siguiente: N2 + 3 H2 → 2NH3 3) El propano (C3H8) es usado como combustible en los hogares, reacciona con el oxigeno para producir dióxido de carbono (CO2) y agua (H2O) mediante la siguiente reacción: C3H8 + 5 O2 → 3 CO2 + 4 H2O a) Si se queman 2 Litros de propano (C3H8) calcula los litros de CO2 que se emiten a la atmósfera.
Answer:
a. 4.46 moles de CO₂
b. 80.2 g de H₂O
38.25 moles de H₂
5.55 L de dióxido de carbono
Explanation:
Comenzamos con la reacción: CO₂ (g) + 2 KOH (l) → K₂CO₃ ↓ (s) + H₂O (l)
a. Podemos ver que la relación estequiométrica es 2 a 1.
Pasamos la masa de KOH a moles → 500 g . 1mol/ 56.1g = 8.91 moles
2 moles de KOH necesitan 1 mol de dióxido
Entonces, 8.91 moles necesitarán (8.91 . 1)/2 = 4.46 moles
Convertimos los moles en masa → 4.46 mol . 44g /1mol = 196 g de CO₂
b. Como no tenemos información de los reactivos, trabajamos con el KOH (recorda que siempre hacemos los cálculos con el reactivo limitante).
La relacion estequiometrica también es 2 a 1.
Con 2 moles de KOH producimos 1 mol de agua
Entonces 8.91 moles producirán la mitad, 4.46 moles
Pasamos a gramos → 4.46 mol . 18g /1mol = 80.2 g de H₂O
N₂ + 3H₂ → 2NH₃
En esta relacion, la relación de moles es 1 a 3.
1 mol de N₂ necesita 3 moles de H₂ para llevar a cabo la reacción
12.75 moles de nitrogeno reaccionarán con (12.75 . 3)/ 1 = 38.25 moles de H₂
La siguiente es una reacción de combustión:
C₃H₈ + 5O₂ → 3 CO₂ + 4 H₂O
Como en este caso tenemos volumen, necesitamos averiguar la densidad del propano para sacar la masa y de ahi los moles:
Densidad del propano es 1.83 g/L
Si tenemos 2 Litros de gas, entonces tendremos el doble de masa
2L . 1.83 g/L = 3.66 g
Convertimos a moles → 3.66 g . 1 mol/44g = 0.083 moles
1 mol de propano produce 3 moles de dióxido.
0.083 moles producirán (0.083 .3) /1 = 0.249 moles
Convertimos a gramos → 0.249 moles . 44g/ 1mol = 10.98 g
La densidad del CO₂ es 1.976 g/L
d = m/V → V = m/d → 10.98 g / 1.976 L = 5.55 L
A scientist combines two substances and observes that the solid substance dissolves in the liquid substance, but he observes no other changes. Which statement is likely the best description of what the scientist observed?
change from solid to liquid
Explanation:
Diffusion of water across the cell membrane is called ____
a. Diffusion
b. Osmosis
c. Concentration
Answer:
B Osmosis
Explanation:
temperature is a measure of the ______ of an object. 1. kelvin 2. insulator 3. average KE 4. radiation 5. specific heat
Answer:
5
Explanation:
Temperature calculates heat/the temperature in the specific location.
use multisim and I
need calculous
The problem to be solved is the
design of a traffic light to control an intersection of two
avenues. In addition, said traffic light must serve the vehicular
crossin
Adhere to traffic regulations and guidelines throughout the process.
To design a traffic light system for an intersection using Multisim software and calculus, follow these steps. First, define the intersection and determine traffic flow. Next, establish the traffic light phases based on the traffic patterns. Use calculus to calculate the durations of each phase, considering factors like traffic volume and pedestrian crossing times. Create an optimization problem, setting an objective function to minimize delays and congestion.
Solve the optimization problem using calculus techniques and numerical methods. Implement the optimized timings in Multisim to simulate the traffic light system. Evaluate the simulation results, refine the timings if needed, and consider factors such as pedestrian safety and emergency vehicle prioritization. Adhere to traffic regulations and guidelines throughout the process.
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