Answer:
12.64 cm^3 to the nearest hundredth
Explanation:
1 L of 0.25M of HCl contains 0.25 * (1.008 * 35.45) g of HCl
= 9.1145 g HCl.
So 2 litres contain 18.229 g HCl.
So we need the volume of concentrated acid which contains 18.229 g HCl.
1.46 * 0.98 = 1.4308 g are in 1 cm^3
So 18.229 g are in 18.229/1.4308
= 12.6404 cm^3 (answer).
which of the following colors has the highest energy?
a. red
b. green
c. yellow
d. blue
Answer:
Blue
Explanation:
It is the closest color to violet.
The color which has the highest energy is the blue color because it have low wavelength value.
How do we calculate energy of wave?Energy of any waves of color will be calculated by using the below equation as:
E = hυ, where ............... (i)
h = plank's constant
υ = frequency of wave
Frequency is inversely proportional to wavelength (λ) as:
υ = c/λ, where ................. (ii)
c = speed of light
From (i) & (ii)
E = hc/λ
From this we conclude that wavelength is inversely proportional to energy and wavelength of blue color is smaller than other so that it will have higher energy.
Hence blue color has the highest energy.
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Logic Puzzle: Determine the concentration in the eye dropper. Write the steps below. What is the concentration of the solution in the Eyedropper?
To determine the concentration of a solution, you need to first measure the volume of the solution, then calculate the moles of solute present. After these measurements, divide the number of moles of solute by the volume of the solution in liters to get the molarity. For dilutions, use the formula M1V1 = M2V2.
Explanation:To determine the concentration of the solution in the eyedropper, we would use the concept of molarity and possibly dilution. As presented in the instructional guidelines:
The first step would be to measure the volume of the solution using a graduated cylinder, or in this case, the volume within the eyedropper. This process involves reading the measurement at the bottom of the meniscus. Following this, you should calculate the number of moles of the solute present in the solution. Here, two examples were given: moles of a generic solute (0.63 mol solute in a 1.00 kg solvent) and moles of hemoglobin. To determine this, you would need to know the mass of the solute that was dissolved and the molar mass of the solute to convert from grams to moles. To finally determine the molarity (concentration) of the solution, one would divide the number of moles of solute by the volume of the solution (in liters). If the problem involves a dilution, you would use the formula M1V1 = M2V2 where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume. With this, you would be able to calculate the molarity after dilution.Learn more about Molarity here:
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In Eyedropper the 1:10 solution is more concentrated than the 1:20 solution.
The concentration of the unknown solution in the eyedropper, follow these steps:
Perform a Serial Dilution: Take a known volume of the concentrated solution and dilute it step-by-step. For example, if you are preparing six different solutions, draw a diagram showing the volume withdrawn from the concentrated solution and the volume of water added at each step.Measure Observations: Record what happens in each test tube. Note any color changes or reactions.Calculate Final Concentration: Use the formula for dilution: C1V1 = C2V2, where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume after dilution. For example, if you start with a concentration of 1.3 x [tex]10^-^4[/tex] M and dilute 2.0 mL to a final volume of 10.00 mL, the new concentration is calculated as follows:C2 = (C1 * V1) / V2 = (1.3 x [tex]10^-^4[/tex] M * 2.0 mL) / 10.0 mL = 2.6 x[tex]10^-^5[/tex] M
Ensure you rinse the beaker, funnel, and inside of the volumetric flask with water to avoid contamination. Finally, when adding the last few drops of water to the solution, make sure your eyes are level with the graduation mark to ensure accurate volume measurement.
Questions and Discussion
More Concentrated Solution: The 1:10 hydrochloric acid solution is more concentrated than the 1:20 solution.Standard Solution Concentration: Based on the example, the standard solution concentration can be calculated similarly to the above example.41.6 mL of an HCIO2 solution were
titrated with 14.85 mL of a 0.146 M.
NaOH solution to reach the
equivalence point. What is the
molarity of the HClO2 solution?
Answer:
0.0521 M
Explanation:
HClO2 + NaOH ---> NaClO2 + H2O
M(HClO2)V(HClO2) = M(NaOH)V(NaOH)
M(HClO2)*41.6 mL = 0.146 M*14.85 mL
M(HClO2) = 0.146*14.85/41.6 M = 0.0521 M
help need due tonight!!!
Which equation is used to describe reaction rates?
S products−S reactants
∆H−T∆S
pV=nRT
∆(reactant or product)/∆time
Answer: [tex]Rate=\frac{\Delta_{\text {reactants or products}}}{\Delta_{time}}[/tex]
Explanation:
Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.
Rate of reaction can be defined in terms of reactants or products. It is the ratio of disappearance of reactants per unit time or ratio of appearance of products per unit time.
[tex]Rate=\frac{\Delta_{reactants}}{\Delta_{time}}[/tex] or [tex]Rate=\frac{\Delta_{products}}{\Delta_{time}}[/tex]
[tex]S_{products}-S_{reactants}[/tex] gives the entropy change for the reaction.
[tex]\Delta H-T\Delta S[/tex] gives Gibbs free energy.
[tex]PV=nRT[/tex] is the ideal gas equation.
Final answer:
Chemical kinetics equation for reaction rates and how rates of reactions depend on reactant and product concentrations.
Explanation:
Reaction rates in chemical kinetics are described by the equation: rate = k[A]m[B]n , where k is the rate constant, m and n are exponents determined experimentally, and m+n is the reaction order.
The rate of a chemical reaction can be expressed as the change in concentration of reactants or products over time. In general, the rate of reaction depends on the concentration of reactants or products involved in the reaction.
For a net forward reaction under rapid equilibrium conditions, the rate equation can be derived and expressed in terms of concentrations of reactants and products.
What is the substance called that is being dissolved in a solution?
concentrator
solute
mixture
solvent
What is the substance called that dissolves the other substance in a solution?
mixture
solvent
solute
concentrator
Answer:
Solute, solvent
Explanation:
In a solution, the substance that is dissolved is called the solute, and the substance that does the dissolving is called the solvent. Together, they form a solution, which is a homogeneous mixture where the solute is evenly distributed in the solvent.
Explanation:In a solution, the substance that gets dissolved is called the solute. For instance, when you make a cup of tea, the tea leaves (or tea bag) represent the solute, as they get dissolved in the water. Meanwhile, the substance that does the dissolving is referred to as the solvent. In the tea example, the water would be the solvent because it is the substance that dissolves the tea leaves or tea bag.
The process of a solvent dissolving a solute results in a solution, a homogeneous mixture where the solute is uniformly distributed within the solvent.
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In which form is energy stored at the end of photosynthesis?
A. Proton energy
B. Electron energy
Oo oo
c. Solar energy
D. Chemical energy
Answer:Chemical energy
Explanation:
What is the empirical formula for
C12H10O
The empirical formula is Diphenyl ether. 2-Phenylphenol, or o-phenylphenol.
For the empirical formula of a compound, you need to find the simplest, whole-number ratio of the elements present in the compound. The given molecular formula is C12H10O.
1. Determine the number of moles for each element:
Carbon (C): 12 moles
Hydrogen (H): 10 moles
Oxygen (O): 1 mole
2. Find the simplest, whole-number ratio by dividing each mole value by the smallest number of moles (which is 1 in this case):
C: 12 moles / 1 = 12
H: 10 moles / 1 = 10
O: 1 mole / 1 = 1
So, the empirical formula is Diphenyl ether. 2-Phenylphenol, or o-phenylphenol.
Based on the kinetic molecular theory, which of the following statements is correct about a sample of gas at a constant temperature and volume?
The net kinetic energy of its particles decreases due to collisions.
The net kinetic energy of its particles increases due to collisions.
It has a constant average kinetic energy.
Its average kinetic energy is always zero.
Answer:
C) It has a constant average kinetic energy
Explanation:
The average kinetic energy of the particles in a gas is directly proportional to the temperature of the gas, according to the equation.
k is the Boltzmann's constant
T is the absolute temperature of the gas
Therefore, temperature of a gas is a measure of the average kinetic energy of the particles.
In this problem, we are told that the gas is at constant temperature (and volume): therefore, according to the previous equation, this means that the average kinetic energy is also constant.
Answer:
C - It has a constant average kinetic energy
Explanation:
Got it right on the test
A car has initial velocity of 50 m/s and a constant acceleration of 50 m/s2, whats the car velocity after 3 seconds?
Answer:
200 m/s.
Explanation:
The car's velocity after 3 seconds can be calculated using the kinematic equation:
v= u+ at
Given:
- Initial velocity, u = 50m/s
- Acceleration, a = 50m/s2
- Time, t = 3 s
Plugging the values into the equation:
v = 50 + 50 * 3
v = 50 + 150
v = 200 m/s
Therefore, the car's velocity after 3 seconds will be 200 m/s. Hope this helps!!
The car's velocity after 3 seconds is 200 m/s, calculated using the formula for final velocity with an initial velocity of 50 m/s and an acceleration of 50 m/s².
To find the final velocity of a car with an initial velocity and constant acceleration, you can use the formula v = u + at, where v is final velocity, u is initial velocity, a is acceleration, and t is time.
In this case, the car has an initial velocity (u) of 50 m/s and a constant acceleration (a) of 50 m/s². After 3 seconds (t), we can calculate the final velocity using the formula:
v = u + at
v = 50 m/s + (50 m/s² × 3 s)
v = 50 m/s + 150 m/s
v = 200 m/s
Therefore, the car's velocity after 3 seconds is 200 m/s.
Why might a scientist repeat an experiment if he/she did not make a mistake in the first one? An experiment should be
repeated to
A)
increase income for increased work.
B)
prove how interesting the study was.
C)ensure the results are accurate,
D)
eliminate steps and save time.
Answer:
c) ensure the results are accurate
Explanation:
you don't really know they're accurate unless you get them 2+ times
Vinegar, HCl, and H2SO4 are examples of
salt
acid
or base?
Answer:
Acid
Explanation:
Vinegar is a dilute form of acetic acid, while HCl is hydrochloric acid and H2SO4 is sulfuric acid. All of these are acids. Hope this helps!
Answer:
acids
Explanation:
In a compound, which type of bond is the sharing of electrons between adjacent atoms?
chemical bond
nuclear bond
hydrogen bond
electric bond bye the way can you help with more in the chat thing i need help
thanks to whoever answers
Answer:
Covalent bond
Explanation:
Sustainability describes the actions humans can take to try and maintain some sort of balance with the Earth Air quality, water quality and availabilityreduced land erosion, replacing what is taken from the Earth (trees, crops, ) are just a few of the issues that sustainability deals withSelect one of the following scenarios that best describes an individual's actions that would help with sustainability.
A ) Reduced output in wind turbine blades would cut down on the carbon footprint of the factories that complete these tasks. This would help the Earth in the long run . Continually adding chemicals to sewage, after it is treated and before it is released back into the water supply, will help humans and the Earth into the foreseeable future . Adhering to scientifically backed guidelines on how to harvest and replant trees in a way that would not cause soil erosion or a loss in the biodiversity in that specific area would help the Earth in the long run D) Continued use of pesticides , herbicides , insecticides , and rodenticides will allow crops to grow and feed millions of people . The buildup of these chemicals in the environment is too small of a concern to try and change what is currently taking place
Answer:The answer is B
Explanation:
There is less water lost due to evaporation and therefore more available to plants. Mulch and minimum tillage results in twice as much available water as does deep tillage. This is an immediate benefit. We are looking for future benefits: less runoff and erosion, more soil stays in place, the soil is more fertile, and farmers use less fossil fuels.
Which method is most likely used to identify what happened before the start of the paleozoic era?
Answer:C
Explanation:
on edge
What would happen to density if the amount of the sample was increased? What is a compound?
Answer:
Density directly proportional to mass and inversely proportional to volume, if you increase the density of the mass increases and vice versa, if you increase the volume density decreases and vice versa.
A compound is something that is composed of two or more separate elements; a mixture.
Explanation:
100 points guys please help me
Answer:
I’m pretty sure its D. Sweating when you are hot
Anthony's homework assignment is to demonstrate that an orange has already undergone a chemical change. Which of the following
should he bring to class to best demonstrate a chemical change?
A. Diced orange
B. Rotten orange
C. Peeled orange
D. Mashed orange
Some plant seeds are adapted to sprout with a limited amount of water. For what environmental change are these seeds most likely adapted? earthquake tsunami drought global warming
Answer:
c
Explanation:
edge 2023
An unknown mass of aluminum requires 6290 joules to raise
the temperature from 23.9°C to 80.0°C. What is the mass of the
aluminum?
Specific heat value of aluminium is 0.900 J/gK
Answer:
124.579 g
Explanation:
Amount of heat required to change the temperature of body is given by the equation given below
Q = m* c * ΔT ____________________equation A
where Q is the total heat energy required by the any object
c is the specific heat capacity of the body J/gK
ΔT is the difference of final temperature of the object and initial temperature of the object
______________________________________
Given Q = 6290 joules
c = 0.900 J/gK
To calculate the temperature in kelvin from Celsius
we can use the formula
K = C + 273
initial temperature = 23.9°C
initial temperature on kelvin scale = 23.9° + 273 = 296.9
Final temperature = 80°C
initial temperature on kelvin scale = 80° + 273 = 353
ΔT(temperature difference) = 353 - 296.9 = 56.1
___________________________________________
let the mass of of the aluminum be m g
substituting the value of Q , c, ΔT in equation A we have
Q = m* c * ΔT
=> 6290 = m * 0.900 * 56.1
=> m = 6290/(0.900 * 56.1 )
=> m = 6290/50.49
=> m = 124.579 g
The mass of the aluminum is 124.579 g
Taking into account the definition of calorimetry, the mass of the aluminum is 124.58 grams.
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the heat energy that is supplied to a body or an object, causes its temperature to increase without affecting its molecular structure and therefore its phase. In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
The equation that allows calculating heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
Q= 6290 Jc= 0.9 [tex]\frac{J}{gK}[/tex]m=?ΔT= Tfinal - Tinitial= (80 - 23.9) C= 56.1 C= 56.1 K Being a temperature difference, the value is the same in ° C and in ° KReplacing:
6290 J= 0.9[tex]\frac{J}{gK}[/tex]× m× 56.1 K
Solving:
6290 J= 50.49 [tex]\frac{J}{g}[/tex]× m
6290 J÷ 50.49 [tex]\frac{J}{g}[/tex]= m
124.58 g= m
Finally, the mass of the aluminum is 124.58 grams.
Learn more:
brainly.com/question/11586486?referrer=searchResultsbrainly.com/question/24724338?referrer=searchResultsThe Ka of carbonic acid is 4.3 x 10-7.
H2CO3 = H+ + HCO3
This means that H2co3 is a____.
A.good hydrogen-ion donor
B. poor hydrogen-ion donor
C. good hydrogen-ion acceptor
Answer:
poor hydrogen-ion donor
Explanation:
Acid dissociation constant constant chemistry is the equilibrium constant of the dissociation reaction of an acid, it is denoted by Ka. This equilibrium constant is a measure of the strength of an acid in a solution.
Note these as a rule of thumb:
When Ka is large, the dissociation of the acid is favored.
When Ka is small, the acid does not dissociate to a large extent.
Hence, a Ka of 4.3 x 10-7 shows a weak acid. A weak acid is a poor hydrogen ion donor because it does not dissociate to a large extent in solution.
According to its chemical reaction where it donates a hydrogen ion, and despite having a small Ka value, H2CO3 (carbonic acid) can be classified as a relatively good hydrogen-ion donor.
Explanation:Given that the equation H2CO3 = H+ + HCO3- represents the dissociation of carbonic acid into a hydrogen ion (H+) and a bicarbonate ion (HCO3-), H2CO3 can be identified as a good hydrogen-ion donor. This is because in this reaction, it readily gives up a hydrogen ion, which is characteristic of acid behavior. An acid's strength is determined by its ability to donate hydrogen ions, and the bigger the constant Ka value, the stronger the acid. However, a Ka of 4.3 x 10-7 is quite small, indicating that carbonic acid does not completely ionize in solution but it's relatively better at donating hydrogen ions than accepting them.
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Why does a pan of warm water eventually become the same temperature as the room it is in
Final answer:
A pan of warm water will become the same temperature as the room because of heat transfer due to non-equilibrium. Heat will move from the warm pan to the cooler room air until they reach thermal equilibrium. This process is guided by the second law of thermodynamics and the principle of calorimetry.
Explanation:
A pan of warm water will eventually become the same temperature as the room it is in because the water and the pan will exchange heat with the room's air until thermal equilibrium is reached. Initially, the pan is at a higher temperature than the surrounding air. Over time, heat is transferred from the warmer object (the pan with water) to the cooler one (the surrounding air) until both reach the same temperature. This principle is based on the second law of thermodynamics, stating that the heat will always flow from a hotter object to a cooler one until the system reaches equilibrium.
When you pour 0.250 kg of 20.0°C water into a 0.500-kg aluminum pan with a temperature of 150°C and place it on an insulated pad, the pan and the water are initially not in thermal equilibrium. However, due to the rapid heat transfer, they will quickly exchange heat. The heat lost by the pan equals the heat gained by the water. The process continues until they are both at the same temperature, known as the thermal equilibrium.
Blacksmiths use heavy use heavy clothes and gloves so that they do not get burned
by fire. The materials do not transfer heat quickly, and therefore we call these
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O conductors
semiconductors
insulators
O convectors
Answer:
insulators
Explanation:
Insulators are any substance which do not let any heat to pass through it. In other words we can say that insulators are bad conductors of heat.
Example of insulators are clothes, woods, plastic
Blacksmiths work with metals which are heated at very high temperature. If the body of blacksmiths comes in contacts of metal with high temperature, they may get severe burn. To avoid any accidents they use clothes and gloves so in case if by mistake they come in contact with high temperature, these clothes and gear do not let let pass through it and protect the body of blacksmith.
Since these clothes and gloves do not let heat flow through it they belong to the category of insulators.
How many grams are there in 4.50 moles of Ba(NO2)2?
To find the mass of 4.50 moles of Ba(NO2)2, you calculate its molar mass using atomic masses and multiply by the number of moles. The result is 1176.03 grams for 4.50 moles of Ba(NO2)2.
Explanation:To calculate the mass of 4.50 moles of Ba(NO2)2, you first need to find its molar mass by adding the atomic masses of barium (Ba), nitrogen (N), and oxygen (O) from the periodic table. The molar mass of Ba(NO2)2 is calculated as follows:
(1 mol Ba)(137.33 g/mol) + (2 mol N)(14.01 g/mol) + (4 mol O)(16.00 g/mol) = 261.34 g/mol
Then, you multiply the molar mass by the number of moles:
(4.50 moles) × (261.34 g/mol) = 1176.03 grams
Therefore, there are 1176.03 grams in 4.50 moles of Ba(NO2)2.
With the upcoming presidential election, Ira decided to create a survey to find out who might win. He carefully created a vali
survey and gave it to five of his closest friends. He then tallied the results from the surveys and published his data in the sche
newspaper. Which of these would be a reason why Ira's results are not valid?
A)
The survey was not good enough
B)
The sample size of five was too small.
C)
There is not problem; the results are valid
D)
He only published his data in a school newspaper.
Answer:B)
The sample size of five was too small.
Explanation:
Which of the following statements about a base are TRUE?
1. Bases are used in the manufacturing of soap.
2. Bases have a sour taste.
3. Fertilizer manufacture and cotton processing use bases.
1 and 3 only
2and 3 only
All of 1, 2, and 3
1 and 2 only
Answer:
explanation:
1
Write the steps that describe the process of water changing from a solid to a liquid, and from a liquid to a gas. Ice, Liquid water, Steam
The steps which we taken into consideration during the changing of state of water from ice to steam are by increasing the temperature or by providing heat.
What is change of state of matter?When any amount of energy is released or absorbed by any matter as a result of which changes in state of matter of substance takes place.
Solid state of water is ice and this form will change into liquid form means into liquid by the absorption of energy.Liquid water will change into steam when we provide heat by increasing the temperature to 100 degree celsius.Hence, the steps that required to change ice to steam is by increasing temperature.
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- 2 Points
An object is located 75.0 cm from a concave mirror. The magnitude of the
mirror focal length is 15.0 cm. What is the image distance? Use the equation
d = auf
O A. 12.5 cm
O B. -18.8 cm
O C. -12.5 cm
O D. 18.8 cm
SUBMIT
Answer:
18.8
Explanation:
Just trust me it’s Ap3x Things
Answer:
18.8
Explanation:
*wink wink*
Using the equation, what is the mass of lithium nitride is produced from 12.26 L of ammonia?
Answer:
19.2g
Explanation:
The equation of the reaction is;
Li3N(s) +3H2O(l) ---->NH3(g) +3LiOH(aq)
From Avogadro's law we know that 1 mole of any gas occupies a volume of 22.4 L under standard conditions.
It is also clear from the equation that 1 mole of lithium nitride produces 1 mole of ammonia occupying 22.4L volume
Hence;
1 mole of Lithium nitride yields 22.4 L of ammonia
x moles of lithium nitride yields 12.26L of ammonia
x= 12.26×1/22.4
x= 0.55 moles of lithium nitride
Molar mass of lithium nitride= 34.83 g/mol
Mass of lithium nitride = number of moles × molar mass
Mass of lithium nitride= 0.55 moles × 34.83 g/mol
Mass of lithium nitride = 19.2g
Answer:
The mass of lithium nitride that produces 12.26 L of ammonia is 19.053 g
The mass of lithium hydroxide produced is 39.3 g
Explanation:
Water and Lithium nitride combine to form ammonia and lithium hydroxide the equation for the reaction being;
Li₃N(s) + 3H₂O(l) → NH₃ (g) + 3LiOH (aq)
That is 1 mole of lithium nitride combines with 3 moles of water molecules to form 1 mole of ammonia gas plus 3 moles of lithium hydroxide
Whereby the volume of ammonia produced is 12.26 L, we have at STP
PV = nRT
Therefore, n = PV/RT
Where:
P = Pressure = 1 atm
V = Volume = 12.26 L
R = Universal gas constant = 0.08205 L·atm/(mol·K)
T = Temperature = 273.15 K
Plugging the values in gives;
n = (1×12.26)/(0.08205×273.15) = 0.547 moles
Since 1 mole of lithium nitride forms 1 mole of NH₃, 0.547 mole will be required to produce 0.547 moles of NH₃ and 3×0.547 or 1.64 moles of LiOH
Molar mass of Li₃N = 34.83 g/mol
Molar mass of LiOH = 23.95 g/mol
Since mass = Number of moles × molar mass, we have;
Mass of Li₃N = 0.547 × 34.83 = 19.053 g
Mass of LiOH = 1.64 × 23.95 = 39.3 g
Therefore;
The mass of lithium nitride that produces 12.26 L of ammonia = 19.053 g
The mass of lithium hydroxide produced = 39.3 g.
Please help! I really don’t understand it
Answer:
C. It makes sure there is a balance inside the body
Explanation:
Hope this helps
Answer:
C. It make sure there is a balance inside the body.
Explanation:
Homeostasis in the body tries to maintain the norm for the survival of the body. This includes temperature & amount of fluids inside the body. If they are too out in the end of the spectrum, your brain will tell you that you need to obtain it, such as drinking more water, going to a cool place if you are in the heat, or to obtain warmth if you are in the cold.
Besides genetics, what other factors are responsible for
how you will grow and develop?
Answer:
D
Explanation:
It depend on your parents genes. What they have, is what you'll have.
~Jack Pullman
p.s. Mark for brainiest!
Answer:
C. Nutrition and Enviroment
Explanation:
An individual growing up in poverty will not get as the good nutrition as an individual from a rich household. Nutrition affects growth, so malnutrition can make a person shorter and ruining their potentially taller height.