Answer:
E = 6.27 × 10⁻²³ Joules
Explanation:
E = h (Plancks constant) × f (frequency)
(Plancks constant = 6.63 × 10⁻³⁴ J×s)
f = λ × c (used to find frequency so you can satisfy energy equation)
*Have to find wavelength in meters to multiply by speed of light*
1. f = (3.15 × 10⁻⁷ m) × (3 × 10⁸ m/s)
2. f = 9.45 × 10¹⁰ s
3. E = (6.63 × 10⁻³⁴ J×s [Plancks constant]) × (9.45 × 10¹⁰ s)
E = 6.27 × 10⁻²³ Joules
Which of the above reactions is NOT an oxidation-reduction (redox) reaction?
A.First (blue)
B.Third (white)
C.Fourth (purple)
D.Fifth (pink)
E.Second (red)
Explanation:
I think third(white) isn't a redox reaction
When 0.005 moles of silver(1) nitrate reacts with sodium carbonate, which of the following statement is correct?
(You must show all your work)
A) This is a redox reaction
B) This is a precipitation reaction and 0.69 g of the precipitate will be formed
C) This is a precipitation reaction and 1.38 g of the precipitate will be formed
D) This is a precipitation reaction and 0.83 g of the precipitate will be formed
Explanation:
no sé de qué me estás hablando
This is a precipitation reaction and 1.38 g of the precipitate will be formed is the statement is correct. Hence, option C is correct.
What is a precipitation reaction?A precipitation reaction is when two or more dissolved chemicals combine to form one solid products. The exchange of ions between ionic compounds in aqueous solutions is a common component of these reactions, which are also occasionally referred to as double displacement, double replacement, or metathesis reactions.
in response to precipitation a process that converts soluble salts into solids that are insoluble in water. a neutralizing response an interaction between an acid and a base that results in the production of salt, water, and an ionic molecule.
Precipitate refers to a solid that forms from a solution. The blending of two transparent solutions is a common example: NaCl in combination with silver nitrate The answer is. The soli cannot be dissolved in water.
Thus, option C is correct.
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help me. correct answer will be marked as brnlst
Answer:
You are correct it is NaCl
which of the following statements is true?
just look at the picture
c
Explanation:
compounds are combine from two or more elements
The table compares vapor pressure values for water ethanol and diethyl ether Add six temperatures determine the approximate normal boiling point for each substance what do the data suggest about the relative strength of attraction between particles in each substance
Water has the strongest intermolecular forces followed by ethanol and diethyl ether has the least intermolecular forces.
From the table, we can see the vapor pressures of water, ethanol and diethyl ether. The boiling point of water is 100°C, the boiling point of ethanol is 80°C while the boiling point of diethyl ether is 40°C.
We can see that the vapor pressures and approximate normal boiling points of the substances varies with the nature of intermolecular bond forces in the molecule.
Water has highest boiling point and the lowest vapor pressure followed by ethanol. Diethyl ether has the highest vapor pressure and lowest boiling point from the data in the table.
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If 22.5 L of nitrogen at 748.3 mm Hg is changed to a pressure of 1294.6 mm Hg at constant
temperature. What is the new volume?
Answer:
it down their!!!!!!!!!!1
Explanation:
The new volume
=
23.2
L
Hydrocarbons (alkanes, alkenes, alkynes) have all the properties below except one.
Which is not a property of hydrocarbons?
A.nonpolar
B.high melting and boiling points
C.insoluble in water
D.flammable
Answer:
B
Explanation:
The answer is B. All hydrocarbons are nonpolar, they are insoluble in water and they are highly flammable. Now, not all hydrocarbons have high boiling and melting point. For example, methane (CH4) has a boiling point of something clode to -161°C, and that is low. The boiling point increases when the number of carbon atoms in a compound increases, and based on methane and this theory, not all hydrocarbond have a high boiling point. This makes option B be the correct answer.
hidrógeno
notacion electronica
Answer:
Hydrogen
Electronic notation
Explanation:
All participants in the Genius dog challenge are border collies which some experts think are the what breed of dog?
As far as the intelligence of canines, it is widely accepted as a fact that the Border Collie is the most intelligent breed of dog.
The conclusion that border collies are the most intelligent breed of dog is credited to a canine psychologist by the name of Stanley Coren. He studied over 138 recognized breeds of dogs to measure the ease with which they learned new commands and the obedience rate of each breed.
Coren studies the learning and obedience of Border Collies over the course of 199 trials and found that this breed of dog performed 95% better than most other breeds, with only 9 of the 138 breeds studied coming close to the results of the border collie. Easily earning the title of the most intelligent breed of dogs.
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the farm is a place where lot's of different__________and________live.goats have________that arch backward.the horns keep them___________.
horns insects animals protected
dog's are man's best friend.dogs eat ______to keep them energetic.dogs permanent__________are ________.a dogs teeth serve as _______and as tools for ________or________food
meat cutting powerful teeth weapon tearing
Answer:
plantsanimalshornsto protect it selfkaleliving with peoplescaring itspecialbite eatExplanation:
I know it's right, because this answer is from my self and I hope it's help to us. keep learning and God bless.
Relate microscopic bonding properties to solid state properties
There are many factors that we can take into account when attempting to relate microscopic bonding properties to solid-state properties, for example, the rigid and immobile nature of solid states and their molecular bonds.
Solid-state properties are simply put, the properties we can observe and measure when studying an element in solid form. These solids have specific characteristics such as:
Structural rigidityThey do not change shapeDo not change the volume they occupyand so on, which although not initially obvious, are caused by the microscopic molecular bonds of their atoms.
The microscopic properties of solids are very similar to that of the solid-state properties. The atoms of a solid are very close together and strongly bonded to one another, because of this the atoms form a very rigid structure that resists changes to their shape or volume, much like the macroscopic properties of the solid. This serves to show how these properties may cause the solid-state effects we can observe normally.
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NEED ANSWER ASAP!! will give brainlist
Which best explains why nanofiltration is an important new technology?
A. It can be used to help regions that have a short supply of usable water.
B. It can be used as an energy source to produce electricity in regions with limited coal.
C. It recycles wastewater to be reused for geothermal energy.
D. It collects solar energy to generate electrical power.
Explanation:
Our Direct Nanofiltration (dNF) membranes offer the unique combination of a low fouling hollow fiber configuration with the ability to remove organics and salinity (hardness) from water in one simple step. Other than a strainer, no further pre-treatment is required. We manufacture our membranes with a patented layer-by-layer process, where multiple nano-scale layers are deposited on a membrane support. This method enables very precise and controlled rejection and flux properties of the membrane. A unique solution for troubled water.
dentify the parts of the atom that are labeled in the diagram.
Answer:
Our current model of the atom can be broken down into three constituents parts – protons, neutron, and electrons. Each of these parts has an associated charge, with protons carrying a positive charge, electrons having a negative charge, and neutrons possessing no net charge.
Identify the major ionic species present in an aqueous solution of C6H12O6 (glucose).
A. 6 C-
, 12 H+
, 6 O–
B. 6 C+
, 12 H+
, 6 O2–
C. 6 CH2+, 6 O2–
D. C6
+
, 12 H+
, 6 O2–
E. no ions are present
Glucose is a molecular substance therefore, there are no ionic species in glucose.
Ionic substances dissolve in water to yield ions. Molecular substances do not produce ions in solution. The conductivity of ionic solutions owes to the presence of ions in solutions. Molecular solutions do not conduct electricity due to the absence of ions.
Glucose is a molecular substance hence they are are no ions present hence glucose does not conduct electricity.
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A reaction mixture initially contains 0.236 mol FeS and 0.670 mol HCl. Once the reaction has reached completion, what amount (in moles) of the excess reactant is left
Answer:
= 0.198 mole H₂S in excess
Explanation:
A quick way to determine limiting reactant is to convert reactant values given to moles and divide by respective coefficient. The smaller value is the limiting reactant other reactants will be in excess. However, when working problem, use mole values given to solve, not results of division.
FeS + 2HCl => FeCl₂ + H₂S
0.236mole/1 0.670mole/2
= 0.236 = 0.335
limiting reactant is FeS; HCl will be in excess.
Problem solution
0.236mole FeS used + 2(0.236 mole HCl used)
=> 0.236 mole FeCl₂ + 0.236 mole H₂S + (0.670 - 0.472) mole HCl in excess or, 0.198 mole H₂S in excess.
Hope this helps. :-)
2. What is the temperature (°C) of 1.50 moles of gas stored in a 10.0 L container at 1558 mm
Hg? (R=0.082 L atm/ mol K, 1.00 atm = 760 mm Hg
(4 points)
Answer:
-106°C
Explanation:
1558 mmHg / 1 × 1 atm / 760. mmHg = 2.05 atm
PV = nRT
2.05 atm (10.0 L) = 1.50 mol (0.082 atmL/molK) T
20.5 atmL = (0.123 atmL/K) T
K/0.123 atm L × 20.5 atmL = (0.123 atmL/K) T × K/0.123 atmL
166.666 K = T
167 K = T (sig figs)
K = °C + 273
167 - 273 = °C - 273
-106 = °C
Did all the silver ions get consumed in the reaction? The molar mass of silver is 107.87 g/mol. Justify your answer.
This problem is asking for the consumption of silver ions when silver nitrate is reacted with copper. In such a case, since no masses are given, we can use the following from similar problems:
Mass of empty beaker: 110.000 g
Mass of beaker with silver nitrate (after all additions) and copper: 331.634 g.
Mass of beaker with silver: 113.395 g.
This means we can write the following chemical equation:
[tex]Cu+2AgNO_3\rightarrow Cu(NO_3)_2+2Ag[/tex]
And thus calculate the mass of silver nitrate that will produce the following mass of silver:
[tex]m_{Ag}^{produced}=113.395g-110.000g=3.395g[/tex]
Next, we use the 2:2 mole ratio of silver to silver nitrate (silver ions source):
[tex]3.395gAg*\frac{1molAg}{107.87gAg}*\frac{2molAgNO_3}{2molAg} *\frac{169.87gAgNO_3}{1molAgNO_3} = 5.35gAgNO_3[/tex]
The step will be defined for the given mass of available silver nitrate which will be compared to 5.35 g (consumed mass) to see if they are the same (all consumed) or different (partial consumption).
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https://brainly.com/question/22031122https://brainly.com/question/2607181https://brainly.com/question/169651888) Structures that regulate which molecules,
nutrients, and substances enter the cell are
A) Genes
B) Endoplasmic Reticulum
C) Cell Membranes
D) Centrioles
please help me I cant remember the parts of the flower and I really need help.
The primary role of coenzyme A in aerobic respiration is to
A. speed up the citric acid cycle.
B. transport electrons to FAD
C. kick off the transport electron cascade.
D. activate acetyl CoA and other molecules in the citric acid cycle.
Answer:
I could be wrong but i believe the answer is D. It was not B when i took the test
Explanation:
A piece of potato had an original mass of 3.2g and after being left in a sugar solution for 24 hours it then had a mass of 2.8g. Calculate the percentage mass decrease of the potato.
Answer: -13% to 3 sig figs
Explanation:
A piece of potato had an original mass of 3.2g and after being left in a sugar solution for 24 hours it then had a mass of 2.8g. Calculate the percentage mass decrease of the potato.
the change in mass is 2.8 -3.2 = -0.4 gm
the % change fro the origial piece is ( -0.4/3.2) X 100 = -12.5%
or -13% to 3 sig figs
some uses of sodium bicarbonate
Answer:
Sodium bicarbonate is an antacid used to relieve heartburn and acid indigestion. Your doctor also may prescribe sodium bicarbonate to make your blood or urine less acidic in certain conditions. This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.
Paano mo mapapanatili na gumagana ang iyong negosyo sa gitna ng pandemic na ito?
Tingnan ang pinakamahuhusay na kagawian at patnubay sa pampublikong kalusugan para mapanatiling ligtas ang iyong mga customer at tauhan.
HOPE IT HELPS:)
PLS FOLLOW:)
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physical and chemical changes occur in digestion. What is an example of an physical change in digestion
teeth chewing food
acid mixing with food
saliva mixing with food
enzymes mixing with food
Answer:
teeth chewing food
Explanation:
When teeth chews food it change its state from hard solid to fine substance that can be easily digested by the body i guess
What is the molarity of Ca(NO3)2 in a solution resulting from mixing 150.0 mL of 0.200 M HNO3 with 150.0 mL of 0.0100 M Ca(OH)2
The molarity of the Ca(NO3)2 solution would be 0.005 M
First, let us look at the balanced equation of the reaction:
[tex]2HNO_3+Ca(OH)_2 ---> Ca(NO_3)_2+2H_2O[/tex]
The mole ratio of HNO3 to Ca(OH)2 is 2:1.
Mole of HNO3 = molarity x volume
= 0.2 x 150/1000
= 0.03 mole
Mole of Ca(OH)2 = 0.01 x 150/1000
= 0.0015
Thus, there is no limiting or excess reactant.
Also from the equation, mole ratio of Ca(OH)2 to Ca(NO3)2 is 1:1. Hence, the mole of Ca(NO3)2 would also be 0.0015 mole.
The total volume of the resulting solution would be: 150 +150 = 300 mL
Thus, the molarity of the resulting Ca(NO3)2 would be:
Molarity = mole/volume
= 0.0015/0.3
= 0.005 M
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How many carbon (C) atoms are in C3Hg? A. 8 B. 5 C. 1 D. 3
Answer:
the answer is D
The collision theory state that?
Answer:
Collision theory states that molecules must collide to react. For most reactions, however, only a small fraction of collisions produce a reaction.
can someone tell me how to find moles in acid&base equations (simple explination pls)
Answer:
When the base neutralizes the acid, the number of moles of H+ = the number of moles of OH-. Therefore, the number of moles of H+ = 0.0125 moles. Every mole of HCl will produce one mole of H+; therefore, the number of moles of HCl = number of moles of H+. The concentration of the HCl is 0.25 M
Write the formula of the conjugate base of C6H5SH.
Answer:
C6H5S^-
Explanation:
This is because you are removing the hydrogen to make it a conjugate base.
The formula for conjugate base of C6H5SH is C6H5S⁻.
What is conjugate base?Conjugate base is defined as the substance which is formed when an acid liberate its protons.
The acid donate protons and the acid changes into base.
Conjugate acid is defined as the pair of compound that differs by its protons by gaining protons.
Conjugate acid and base are based in acid base theory.
Thus, the formula for conjugate base of C6H5SH is C6H5S⁻.
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Identify the six parts of the DNA molecule.
The six parts of DNA serially are A) adenine B) thymine C) Sugars D) Phosphate E) Guanine F) Cytosine.
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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