Answer:
d
Explanation:
collagen is made of proteins
Baking soda is a critical component of chemical
spill kits. Why would a chemist need baking soda to
help clean up spills?
HELPPPPP NOWWW
) I have 0.600 g/dl solution of NaOH. What is M? Whan is N?
N of the given NaOH solution is 0.015 N
To find M of the NaOH solution:
Given: 0.600 g/dl solution of NaOH.
Mass of NaOH = 0.600 gVolume = 1 L.
1L of NaOH solution contains 0.600 g NaOH.
Molar mass of NaOH = 40 g/mol
Number of moles of NaOH = Mass of NaOH / Molar mass of NaOH
= 0.600 g / 40 g/mol = 0.015 mol/L
Thus, Molarity (M) of NaOH = 0.015 mol/L.
To find N of the NaOH solution: Normality, N = M × n.
Where M is molarity of solution and n is the number of equivalents of solute in 1 L of solution.NaOH is a monobasic base and it produces 1 H+ ion on dissociation.
Thus, n = 1N = M × n= 0.015 mol/L × 1 equivalent/L= 0.015 N. Therefore, N of the given NaOH solution is 0.015 N.
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Which process is most likely responsible for the formation of limestone caves?(1 point)
Responses
abrasion
abrasion
carbonation
carbonation
hydrolysis
hydrolysis
oxidation
how many grams of nitrate are in 6.3 grams of ammonia reacted with 1.8 grams of oxygen
Nitrate is created in an amount of 91.24 grams. The balanced equation for the formation of nitrate from the reaction of ammonia and oxygen is: 4 NH3 + 5 O2 4 NO + 6 H2O.
What are some uses for nitrate?These can be found in the air, water, and soil naturally. The body can produce nitrite and nitrate as well. The majority of nitrate used in industry goes toward fertilizing lawns or crops. Moreover, nitrate and nitrite are used to make explosives, ammunition, and various medicinal medications in addition to being utilized to preserve food.
Is nitrite poisonous?Ingestion of nitrate or nitrite under circumstances that cause endogenous nitrosation, which could result in cancer, is classified by the International Agency for Research on Cancer (IARC) as "probably carcinogenic to humans" (Group 2A).
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What is a natural property of water?
To prepare an acetic acid/acetate buffer, a technician mixes 30.6 mL of 0.0880 acetic acid and 21.6 mL of 0.110 sodium acetate in a 100 mL volumetric flask and then fills with water to the 100 mL mark. How many moles of acetic acid are present in this buffer?
Answer: There are 0.00269 moles of acetic acid in buffer.
Explanation:
To calculate the number of moles for given molarity, we use the equation:
\(\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution in ml}}\) .....(1)
Molarity of acetic acid solution = 0.0880 M
Volume of solution = 30.6 mL
Putting values in equation 1, we get:
\(0.0880M=\frac{\text{Moles of acetic acid}\times 1000}{30.6ml}\\\\\text{Moles of acetic acid}=\frac{0.0880\times 30.6}{1000}=0.00269mol\)
Thus there are 0.00269 moles of acetic acid in buffer.
There are 0.00269 moles of acetic acid in buffer.
Calculation for number of moles:To calculate the number of moles for given molarity, we use the equation:
Molarity = Number of moles of solute * 1000 / Volume of solution .....(1)
Given:
Molarity of acetic acid solution = 0.0880 M
Volume of solution = 30.6 mL
On substituting the values:
0.0880 = Number of moles of solute * 1000 / 30.6
Number of moles of solute = 0.0880 *30.6 / 1000
Number of moles of solute = 0.00269 moles
Thus, there are 0.00269 moles of acetic acid in buffer.
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What is the Internal Energy of a Human Body? Define internal energy as Delta E.
SHOW ALL WORK!
20 points
The internal energy of a human body is the net energy contained in the body due motion of its particle or molecules.
In a human body the internal energy is stored . It increases when the temperature of the body rises, or when the body observes some changes. Internal energy we can say that is the sum of kinetic and potential energy of all particles in the body.
Internal energy is a state function of a system and is an extensive quantity. Every substance possesses a fixed quantity of energy which depends upon its chemical nature and also on its state of existence. Every substance have a definite value of Internal energy.
The change in the Internal energy of a reaction may be considered as the difference between the internal energies of the two states.
ΔU = \(E_{B}\) - \(E_{A}\) where \(E_{B}\) and \(E_{A}\) are the initial energies of states A and B. Or we can also write the equation as:
ΔU = ΔE
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How many H atoms are in 0.170 mole of ammonium sulfate?
Answer:
8
Explanation:
Which of the following relationships between
the pressure P, the volume-V and the
e temperature T, represents an ideal gas
behaviour?
A.paVT
B.p TaT/V
C. pTaVet
D.pval/T
E. paV/T
Out of the options given, the expression that represents the ideal gas behavior is:
E. P × V / TWhat is ideal gas equation?The ideal gas law is expressed by the formula PV = nRT,
where
P is the pressure,
V is the volume,
n is the number of moles of gas,
R is the gas constant, and
T is the temperature.
By rearranging this equation, we can derive different expressions for the ideal gas behavior in terms of the pressure, volume, and temperature.
This can be obtained by rearranging the ideal gas law equation as follows:
PV = nRT
Dividing both sides by nT, we get:
P × V / (nT) = R
Since R is a constant for a given gas, the left-hand side of the equation must also be constant for an ideal gas. Thus, the expression P × V / T represents the ideal gas behavior.
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Balance the equation below and identify the type.
NH4NO₂(s)---> N₂(g) + H₂O(l)
Part F Using your outline and the materials you've gathered, write a 250- to 500-word paper using word processing software. Be sure to proofread and revise your writing to catch any errors in grammar, spelling, logic, or organization. Add a works cited page at the end to give credit to your sources. Submit your completed paper and this activity to your teacher for evaluation. i need the answer please just make up a random story I REALLY NEED HELP
A wave is a recurring, periodic disturbance that moves from one place to another via a medium (like water).
What is wave?A wave is a disturbance that moves or propagates away from its source. Although waves can move energy between locations, they do not always move mass. Common examples of waves are light, sound, and ocean waves.
Mobile phones and radar systems are two noteworthy examples of wave applications. Even though radio waves are usually thought to be safe and contribute to background radiation, it is still advised to keep your distance from radio wave sources.
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complete question;
Using your outline and the materials you’ve gathered, write a 250- to 500-word paper using word processing software. Be sure to proofread and revise your writing to catch any errors in grammar, spelling, logic, or organization. Add a works cited page at the end to give credit to your sources. Submit your completed paper and this activity to your teacher for evaluation. This is for Unit Activity: Waves in edmentum
why do you think danny taught that way
Answer:
I wonder why...
Explanation:
help.
Which of the following human activities could lead to more frequent red tides?
A. Adding fertilizers to plants in your yard.
B. Oil left behind by cars driving on city roads.
C. Runoff from factories that are located near oceans.
D. All of the above.
Answer:
D
Explanation:
A compound is found to contain 9.227 % boron and 90.77 % chlorine by mass. What is the empirical formula for this compound?
Answer:
Empirical formula of a compound means that it provides simplest ratio of whole number.
Explanation:
Mass of boron and chlorine is 9.224% and 90.74%
If a buffer solution is 0.190 M in a weak acid ( a=3.6×10−5) and 0.480 M in its conjugate base, what is the pH?
Solution :
\(pk_b = -log ( K_b)\\\\pk_b = - log ( 3.6 \times 10^{-5})\\\\pk_b = 4.44\)
We know, pH of this solution :
\(pH = pK_a + log ( \dfrac{|conjugate\ base|}{|weak \ acid|}\\\\pH = 4.44 + log(\dfrac{0.480}{0.190})\\\\pH = 4.44 + 0.40\\\\pH =4.84\)
Hence, this is the required solution.
Which of these is an example of a physical property?
A: The fact that iron rusts
B: The texture of a piece of chocolate
C: The effect of acid rain on automobiles
D: The fact that gasoline in a car engine combusts
Where does the oil in cars come from?
SUBJECT: AQUATIC SCIENCE
The oil from cars is gotten from crude oil.
Crude oil and its sources:The car is an automobile that is mainly used for transportation purposes. It is made up of both electrical and mechanical parts.
The mechanical part of the car is driven by the engine which is the heart of the car.
The engine is made up of adjacent moving parts that need to be frequently lubricated through the engine oil.
The engine oil is gotten from crude oil, which is a mixture of hydrocarbons that exist in liquid phase in natural underground reservoirs.
Therefore, the oil from cars is gotten from crude oil.
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how many moles are in 2.91 × 10²² atoms of He?
Answer:
0.048 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
\(n = \frac{N}{L} \\\)
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
\(n = \frac{2.91 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.04833887...\)
We have the final answer as
0.048 molesHope this helps you
A sample of an unknown compound is vaporized at 160 c . The gas produced has a volume of 2330 ml at a pressure of 1.00 atm ,and it weighs 2.10 g
Round answer to 3 significants digits
The molar mass is 3230.8 g/mol
How to determine the valueFirst, we need to know that the formula for the general gas law is represented as;
PV = nRT
such that the parameters are;
P is the pressureV is the volumen is the number of molesR is the gas constantT is the temperatureSubstitute the values
1 × 2.33 = n × 8.314 × 433.15
Multiply the values, we get;
n = 2.33/ 8.314 × 433.15
Divide the values
n = 6.5 × 10⁻⁴ moles
But, number of moles = mass/molar mass
Molar mass = 2.10/ 6.5 × 10⁻⁴
Molar mass = 3230.8 g/mol
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URGENT!!! An unknown hydrate of CoCl₂ has been evaporated in a crucible. Given the following data, find the formula and name of the hydrate.
Mass of crucible: 12.090 g
Mass of hydrate before evaporation and crucible: 16.250 g
Mass of hydrate after evaporation and crucible: 12.424 g
From the given data, the name of the hydrated salt would be \(CoCl_2.83H_2O\).
Formula of hydrateThe formula of the hydrated salt can be determined using the empirical formula approach. That is, we will find the mole equivalent of the anhydrous salt and the water of hydration and then combine them into a single formula after dividing by the smallest mole.
First, we need to determine the mass of the anhydrous salt and the water of hydration.
Mass of crucible (x) = 12.090 g
Mass of hydrated salt + crucible (y) = 16.250 g
Thus, the mass of the hydrated salt can be determined by subtracting x from y.
Mass of hydrated salt = 16.250 - 12.090 = 4.16 g
Mass of hydrate + crucible after evaporating off the water (z) = 12.424 g
Mass of anhydrous salt = z - x
= 12.424 - 12.090
= 0.334 g
Mass of water = 4.16 - 0.334
= 3.826 g
Now, let's find the moles:
Molar mass of \(CoCl_2\) = 129.839 g/mol
Molar mass of water = 18.01 g/mol
Mole of \(CoCl_2\) = 0.334/129.839 = 0.00257 mol
Mole of water = 3.826/18.01 = 0.2124 mol
Dividing through by the smallest mole
\(CoCl_2\) = 0.00257 / 0.00257 = 1
water = 0.2124/ 0.00257 = 83
Thus, the formula of the hydrate would be \(CoCl_2.83H_2O\)
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What is the frequency of a photon of light (in Hz) that has an energy of 3.75 × 10-21 J?
5.66 × 1012 Hz
3.75 × 10-21 Hz
2.48 × 10-54 Hz
1.77 × 10-13 Hz
The energy of a photon is hv. Where h is plank's constant and v be the frequency. The frequency of a photon with an energy of 3.75 × 10⁻²¹ J is 5.66 × 10¹² Hz.
What is frequency?Frequency of a wave is the number of wave cycles per unit time. It is the inverse of the time period. Thus, has a unit of s⁻¹ which is equivalent to Hz.
Frequency of a wave is directly proportional to the energy.
The energy of a photon = hv
h is the planck constant = 6.62 × 10⁻34 J.s
Given the energy of a photon = 3.75 × 10⁻²¹ J
Thus, frequency = energy/planck's constant
= 3.75 × 10⁻²¹ J/ 6.62 × 10⁻34 J.s
= 5.66 × 10¹² Hz.
Therefore, the frequency of the photon is 5.66 × 10¹² Hz.
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David prepared the potassium phosphate solution by adding 46.3g to 250 mL of water. Kim needs 0.10M potassium phosphate solution. How many stock solutions does she need if she wants to mix 150 ml of diluent?
Answer:
17.2mL
Explanation:
Step 1:
Determination of the molarity of potassium phosphate K3PO4 solution.
This is illustrated below:
Mass of K3PO4 = 46.3g
Molar Mass of K3PO4 = (39x3) + 31 + (16x4) = 212g/mol
Mole of K3PO4 =..?
Mole = Mass /Molar Mass
Mole of K3PO4 = 46.3/212 = 0.218 mole
Volume of water = 250mL = 250/1000 = 0.25L
Molarity = mole /Volume
Molarity of K3PO4 = 0.218/0.25
Molarity of K3PO4 = 0.872M
Step 2:
Determination of the volume of the stock solution of K3PO4 needed.
Molarity of stock solution (M1) = 0.872M
Volume of stock solution needed (V1) =..?
Molarity of diluted solution (M2) = 0.1M
Volume of diluted solution (V2) = 150mL
The volume of the stock solution needed can be obtained as follow:
M1V1 = M2V2
0.872 x V1 = 0.1 x 150
Divide both side by 0.872
V1 = (0.1 x 150)/0.872
V1 = 17.2mL
Therefore, the volume of the stock solution needed is 17.2mL
How moles of Cl' are in a 45 mL of 1,4 M solution of NaCl?
Answer:
.063 moles Cl-
Explanation:
To find moles multiply molarity by volume.
1.4*.045=.063 moles Cl-
HELP!!! WILL MARK BRAINLIEST!!
The diagram below shows different positions of Earth and Mars around the sun.
Based on the diagram, which of these statements is correct?
Earth covers different areas in the same amount of time at position A and position B.
Earth covers a greater area in position A than in position B in the same amount of time.
Mars covers a greater area in position A than in position B in the same amount of time.
Mars covers the same area in the same amount of time at position A and position B.
Answer:
Earth covers a greater area in position A than in position B in the same amount of time.
Explanation:
Based on the diagram that shows different positions of Earth and Mars around the sun, it seems that this statement is correct:
Earth covers a greater area in position A than in position B in the same amount of time. (Covers as I understood it means "overshadowing" Mars)
Explain the structure of atom in Boron
Answer: Diagram of the nuclear composition, electron configuration, chemical data, and valence orbitals of an atom of boron-11 (atomic number: 5), the most common isotope of the element boron. The nucleus consists of 5 protons (red) and 6 neutrons (orange). Five electrons (white) occupy available electron shells (rings).
Explanation:
Identify the item that does not have kinetic energy.
A. A worm crawling
B. A falling leaf
C. An airplane flying
D. A butterfly sitting on a twig
Answer:
D
Explanation:
there is no other answer choice that does not move. This is a fool-proof question because all the other answer choices contain movement except the butterfly resting
Can someone help me with this balanced equation?
Answer:
The balanced equation for the reaction of aqueous calcium chloride and sodium carbonate solutions is:
CaCl2(aq) + Na2CO3(aq) → 2NaCl(aq) + CaCO3(aq)
CaCl2 and Na2CO3 are the reactants in this equation, whereas NaCl and CaCO3 are the products. The coefficients are balanced such that each element has an equal amount of atoms on both the reactant and product sides of the equation.
(it might be wrong, super sorry!)
1 What direction do
molecules move in?
Answer:
The majority of the molecules move from higher to lower concentration, although there will be some that move from low to high. The overall (or net) movement is thus from high to low concentration.
hope this helps!<3
22
a
с
d
Consider the phase diagram for an unknown substance provided in the questions below.
Which point in the phase diagram represents the liquid phase?
Which point in the phase diagram represents the triple point?
Which point on the phase diagram indicates the phase boundary where
sublimation takes place?
What is the name of the transition that takes place from point C to point
G?
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You need to be aware of the temperature and pressure requirements for a given chemical in order to locate spots on a phase diagram.
What are the points?A phase diagram is a graph that displays, as a function of temperature and pressure, the equilibrium conditions between a substance's various states of matter (solid, liquid, and gas). The regions of the phase diagram that correspond to the solid, liquid, and gas states are often delineated by a sequence of curves, along with the intersections of these regions.
You need to be aware of the substance's temperature and pressure conditions in order to pinpoint a point on a phase diagram. For instance, you can identify a point on the phase diagram if you have a sample of a substance at a specific temperature and pressure.
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highlight the atoms that would be directly attached to a hydrogen in the acidic form of this molecule that could participate in hydrogen bonding.
Atoms like Nitrogen, Oxygen and fluorine are directly attached to hydrogen in the hydrogen bonding because there highly electronegative or contains one or more lone pair of electron.
Hydrogen in the acidic form has an atom attached to it that works as a conjugate acid.
Generally the items like oxygen fluorine and nitrogen are attached to hydrogen.
In order to attach to hydrogen to form the hydrogen bonding. The items should have high electronegativity or it should have one or more than one pair of lone pair electrons.
The Lone pair electrons get donated in the process to add to the acidic properties of the conjugate acid.
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