Answer:
It has three different types of Atoms
it has three oxygen atoms
Explanation:
Nitric acid has the chemical formula HNO3. It is a mineral acid that is very useful as a precursor in fertilizer production.
There are three different kinds of atoms present in a molecule of nitric acid. These atoms are
nitrogenhydrogenoxygenThere are three oxygen atoms in the molecule and one atom of hydrogen and nitrogen respectively.
find the number of neutron electron and proton in the nuclide 18.Ar40
Answer: The number of neutron electron and proton in the nuclide [tex]_{18}^{40}\textrm {Ar}[/tex] is 22, 18 and 18.
Explanation:
Atomic number is equal to the number of protons or number of electrons for a neutral species and is specific to a particular element.
Mass number is the sum of number of protons and the number of neutrons.
Here the atomic number of Argon is 18 , thus the number of protons is 18 and thus the number of electrons is also 18.
The given mass number is 40. Thus number of neutrons = (40 - 18) = 22.
The number of neutron electron and proton in the nuclide [tex]_{18}^{40}\textrm {Ar}[/tex] is 22, 18 and 18.
what do solar power produced
Answer:
Solar technologies convert sunlight into electrical energy either through photovoltaic (PV) panels or through mirrors that concentrate solar radiation. This energy can be used to generate electricity or be stored in batteries or thermal storage.
Explanation:
litmus is made from plant pigment.
it is red when placed in an acidic solution.
it is blue when placed in an alkaline solution.
it is purple when neutral.
a) what do we call substance that change colour like this?
b) what colour would litmus be in a solution of pH 10?
c) what colour would you expect litmus to be in pure water?
Answer:
For (a): The substances are known as acids and bases.
For (b): The color of the litmus for pH = 10 will be blue.
For (c): The color of the litmus for pure water will be purple.
Explanation:
pH determines the acidity or basicity of a solution. There are three types of solution classified based on the pH:
If pH<7 then the solution is acidic in nature If pH>7 then the solution is basic/alkaline in nature If pH=7 then the solution is neutral in natureLitmus paper is used as an indicator to know the type of solution. There are 2 types of litmus paper:
Red litmus paper: It turns blue when placed in a basic/alkaline solution.Blue litmus paper: It turns red when placed in an acidic solution.(a):
An acid is defined as the chemical species that produces hydrogen ions in the solution while a base is defined as the chemical species that produces hydroxide ions in the solution.
(b):
Given pH value = 10
The solution is basic in nature, thus the color of litmus will be blue.
(c):
Pure water is neutral in nature and has a pH of 7.
Thus, the solution of litmus would be purple.
How many milliliters of 3.0 M H2SO4 are needed to make 450 mL of 0.10 M H2SO4?
A family is driving to a nearby city. If they traveled 224.4 miles for 3.3 hours how fast were they traveling?
Looking at the chemical formulae of these compounds, which is an alkane? * 1 point C3H8 C2H4 C2H5OH C5H10
Answer:
(C3H8 )
Explanation:
Alkanes have the general formula of CnH2n+2 where n is the number of carbon atoms
If it takes 25 mL of 0.05 M HCl to neutralize 345 mL of NaOH solution, what is the concentration, M, of the NaOH solution?
Answer:
400ml
Explanation:
A certain drug has a half-life in the body of 3.5h. Suppose a patient takes one 200.Mg pill at :500PM and another identical pill 90min later. Calculate the amount of drug left in his body at :700PM.
Answer:
The amount of drug left in his body at 7:00 pm is 315.7 mg.
Explanation:
First, we need to find the amount of drug in the body at 90 min by using the exponential decay equation:
[tex] N_{t} = N_{0}e^{-\lambda t} [/tex]
Where:
λ: is the decay constant = [tex]ln(2)/t_{1/2}[/tex]
[tex]t_{1/2}[/tex]: is the half-life of the drug = 3.5 h
N(t): is the quantity of the drug at time t
N₀: is the initial quantity
After 90 min and before he takes the other 200 mg pill, we have:
[tex]N_{t} = 200e^{-\frac{ln(2)}{3.5 h}*90 min*\frac{1 h}{60 min}} = 148.6 mg[/tex]
Now, at 7:00 pm we have:
[tex]t = 7:00 pm - (5:00 pm + 90 min) = 30 min[/tex]
[tex]N_{t} = (200 + 148.6)e^{-\frac{ln(2)}{3.5 h}*30 min*\frac{1 h}{60 min}} = 315.7 mg[/tex]
Therefore, the amount of drug left in his body at 7:00 pm is 315.7 mg (from an initial amount of 400 mg).
I hope it helps you!
how is hydroxyl group of alcohol different from the hydroxyl group of alkalis ?
Answer:
Difference between hydroxyl group of alcohol and hydroxyl group of alkalis is as following: Hydroxyl group of alcohol is composed of carbon, oxygen and hydrogen atoms while hydroxyl group of alkalis composed of one alkali group, hydrogen and oxygen atom.
Which statement describes particles of an ideal gas, based on the kinetic molecular theory?
Answer:
There are 5 steps/rules of the ideal gases based on kinetic theory.
Explanation:
1. Particles in a gas are constant moving in random motion.
2. combined volume of the particles is negligible.
3. particles exert no forces on one another
4. any collisions between the particles are completely elastic
5. the average kinetic energy of particles is proportional to temperature in kelvins.
(I had help explaining steps from Sal Khan. I hope this helps! Have a great day!)
A cliff near the water has been worn away. How did erosion change the shape of the land?
Answer:
E
Explanation:
E
Erosion often change the shape of the land. Just as water and wind pass across land, they often carry away grains of soil and wear down rock. Years of this continuous process therefore reduces the size of the cliff, hills and mountains. It often cuts through the ground to form valleys, canyons and ditches.
Water erosion help shape the land also through water movement across the earth in streams and rivers carrying along soil and breaks down pieces of rock in a process called erosion.Water erosion result in loss of topsoil, reduced crop yields, damaged infrastructure, weed dispersal etc.
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help please asap if your good at chemistry
what is Ammonia Conductivity in Solution?
a.light bulb shines brightly
b.light bulb shines dimly
c.light bulb doesn't shine
and explain why you chose that answer.
Answer:
you siad i can answer with anything :)
4. What was the original volume of a gas that expanded to 25
temperature change from 1 to 10 degrees Celsius?
Litmus turns
in acidic solutions.
green
yellow
blue
red
Answer:
red
Explanation:
red shows if solution is acidic
What is a flame test?
A. A method for determining the products of combustion
B. A method of obtaining an emission spectrum from a sample
C. A method for testing the flammability of a sample
D. A method for determining the temperature of combustion
SUBMIT
Answer:
B. A method of obtaining an emission spectrum from a sample
Explanation:
Flame test is a method of obtaining an emission spectrum from a sample.
Emission spectrum is defined as a spectrum of a chemical compound or substance composed of frequencies of electromagnetic radiation. Radiations which are emitted while electron make transition from higher to lower energy level.
Energy of photon is equal to the difference between the two energy states . There are many possible electronic transitions in an atom and every transition has a specific wavelength.Flame test is characteristic for each element as that of an emission spectrum.
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Add distilled water to the beaker until the volume
totals 15 mL.
Record the amount of cornstarch that dissolved.
all
about half
none
20
25 ml
15
10
5
Intro
Answer:
The correct answer on edge for 2021 is C. None.
Explanation:
We know this is correct because the solution is heterogenous after it has been stirred: the substance is not soluble in water.
The solution is heterogeneous after it has been stirred. The cornstarch is not soluble in water. Therefore, option C is correct.
What is the solution?Any mixture of one or more solutes that have been dissolved in a solvent is referred to as a solution. To create a homogenous mixture, a solute must dissolve in a solvent. To create a homogenous mixture, a solute must dissolve in a solvent.
Whereas homogenous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components. A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.
No matter how you sample a homogenous solution, it often has the same characteristics. Sources of water, saline solution, certain metals, and bitumen are homogenous mixes. Examples of heterogeneous combinations are chicken noodle soup, sand, and oil, and water.
Thus, option C is correct.
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Which of the following best defines a spectrum?
A. The range of values of some property
B. The measurement of some property
C. A single value of some property
D. The change over time in the value of some property
SUBMIT
Answer:
The range of values of some property
Explanation:
A.pex, and the comments on the other answer
The best defines a spectrum is The range of values of some.
What is spectrum ?
A spectrum (plural spectra or spectrums) is a condition that is not limited to a specific set of values but can vary, without gaps, across a continuum. The word was first used scientifically in optics to describe the rainbow of colors in visible light after passing through a prism. As scientific understanding of light advanced, it came to apply to the entire electromagnetic spectrum. It thereby became a mapping of a range of magnitudes (wavelengths) to a range of qualities, which are the perceived "colors of the rainbow" and other properties which correspond to wavelengths that lie outside of the visible light spectrum.
Spectrum has since been applied by analogy to topics outside optics. Thus, one might talk about the "spectrum of political opinion", or the "spectrum of activity" of a drug, or the "autism spectrum". In these uses, values within a spectrum may not be associated with precisely quantifiable numbers or definitions. Such uses imply a broad range of conditions or behaviors grouped together and studied under a single title for ease of discussion. Nonscientific uses of the term spectrum are sometimes misleading. For instance, a single left–right spectrum of political opinion does not capture the full range of people's political beliefs. Political scientists use a variety of biaxial and multiaxial systems to more accurately characterize political opinion.
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The H-R diagram is useful in
studying all of these about a star
A.except for its brightness b.location in the sky c.temperature
D.magnitude
Answer:
b.location in the sky (If the question is saying:The H-R diagram is useful in
studying all of these about a star except for)
Explanation:
The theoretical HR diagram plots the temperature of the star vs their luminosity (brightness) and the observational HR diagram plots color of the stars vs the absolute magnitude. Depending on mass, stars will also go through specific evolutionary stages that can be seen through the location of the star on the HR diagram. However, the HR diagram will not have data on the location of the star in the sky.
How would you describe the elements from Group 1 to Group 12 in the periodic
table?
Answer:
Excluding hydrogen in group 1, metals
Explanation:
All the elements from group 1 to 12, excluding hydrogen at the top of group 1 are all metals
How many moles are in 8 grams of NaCl?
When adding electrons to a level,sublevel, or orbital there are three rules that need to be followed. Choose the correct definition for each rule.
Answer:
Aufbau Principle: Electrons occupy orbitals of lower energy first.
Pauli Exclusion Principle: An orbital can hold only two electrons and they must have opposite spin.
Hund's Rule: Electrons fill each orbital singly before any orbital gets a second electron.
Which of the following statements best defines the theoretical yield of a reaction?
a) The ratio of measured yield over actual yield
b) The amount of product measured after a reaction
c) The ratio of measured yield over stoichiometric yield
d)The maximum amount of product that can be obtained
The statement which best defines the theoretical yield of a reaction is the maximum amount of product that can be obtained.
What is yield of any reaction?Yield of any chemical reaction gives idea about the amount of product that will be produced by the chemical reaction between reactants.
Theoretical yield gives idea about the how much maximum yield of any product will be produced in the given chemical reaction by using the stoichiometry of the reaction.
Hence theoretical yield is the maximum amount of product that can be obtained.
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A sealed balloon occupies a volume of 250 mL at an unknown temperature. When the temperature is altered to 30 C, the balloon's volume becomes 0.5 L. Calculate the initial temperature of the air in the balloon.
Answer:
Initial temperature, T1 = 15°C
Explanation:
Given the following data;
Initial volume, V1 = 250 mL to Liters = 250/1000 = 0.25 L
Final temperature, T2 = 30°C
Final volume, V2 = 0.5 L
To find the initial temperature T1, we would use Charles' law.
Charles states that when the pressure of an ideal gas is kept constant, the volume of the gas is directly proportional to the absolute temperature of the gas.
Mathematically, Charles is given by;
[tex] \frac {V}{T} = K[/tex]
[tex] \frac{V1}{T1} = \frac{V2}{T2}[/tex]
Making T1 the subject of formula, we have;
[tex] T_{1}= \frac{V_{1}}{V_{2}} * T_{2}[/tex]
Substituting into the formula, we have;
[tex] T_{1}= \frac{0.25}{0.5} * 30[/tex]
[tex] T_{1}= 0.5 * 30 [/tex]
Initial temperature, T1 = 15°C
KClO3 (s) KCl (s) + 02 (g)
How do you balance this equation
Answer:
2KCl(s) + 6O3O2
Explanation:
I think it's correct
The magnetic field is stronger away from the magnet true or false
Answer:
Big False
Explanation:
As the magnets get closer, the stronger the magnetic field. The farther away, the less strength the field exhibits.
A beaker contains 1.0 M NaOH(aq) solution. To produce a NaOH(aq) solution of molar concentration 0.20 M, we transfer 2.0 ml (cm^3) out of this beaker into a 25 ml cylinder and add distilled water until the total volume reading becomes
A) 12ml
B)10ml
C)8ml
D)5ml
E)2ml
Answer: B) 10 ml
Explanation:
According to the dilution law,
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = molarity of stock [tex]NaOH[/tex] solution = 1.0 M
[tex]V_1[/tex] = volume of stock [tex]NaOH[/tex] solution = 2.0 ml
[tex]M_1[/tex] = molarity of dilute [tex]NaOH[/tex] solution = 0.20 M
[tex]V_1[/tex] = volume of diluted [tex]NaOH[/tex] solution = ?
Putting in the values we get:
[tex]1.0\times 2.0=0.20\times V_2[/tex]
[tex]V_2=10ml[/tex]
Therefore, final volume reading is 10 ml
Write a scientific argument that addresses the question: Why is Jackie an elite distance runner when no one else
in her family has that trait?
1. Review your completed Reasoning Tool. Be sure to include your strongest piece of evidence and make a
connection between the pieces of evidence that go together.
2. State your claim, explaining how it leads to Jackie's trait for running ability. Then, use the evidence to support
your claim.
3. Use the Scientific Argument Sentence Starters above to help you explain your thinking.
4. To make your argument more convincing, be sure to answer the following questions:
.
Which combinations of gene versions do you think Jackie's mom has? Explain your thinking.
Which combinations of gene versions do you think Jackie has? Explain your thinking.
How do Jackie's gene versions relate to her trait for running ability?
Answer:
A mutation in Jackie's genes culminated in developing a new enzyme, resulting in the long-distance running phenotype. Jackie appears to have either the A1Am or A2Am gene variants. Jackie used to play for long periods without tiring, suggesting that her gene variants could generate a protein that results in a stamina feature. Jackie's father bears the A1A2 gene. Since Jackie's mother is a good sprinter, I suspect she bears A1A1 gene variants. Sprinters have much ACTN3 protein in their cells, so that she may have two copies of the A1 gene variant. This means Jackie has at least one clone of the A1 gene allele. People with one or two versions of the A1 gene variant, on the other hand, are rarely successful long-distance runners. Out of 100 total distance runners, only 28 (25 and 3) have an A1 gene copy. Since the gene variants she may have inherited from her parents cannot justify her stamina, she may have a mutant gene version that contains a long-distance running protein. However, I do not believe she has AmAm gene versions because mutations are uncommon. Jackie is an elite long-distance runner due to a gene that no one else in her family has.
A mutation in Jackie's genes culminated in growing a brand new enzyme, ensuing withinside the lengthy-distance jogging phenotype. Jackie seems to have both the A1Am or A2Am gene versions.
Jackie used to play for lengthy durations with out tiring, suggesting that her gene versions may want to generate a protein that outcomes in a stamina feature. Jackie's father bears the A1A2 gene. Since Jackie's mom is a great sprinter, I suspect she bears A1A1 gene versions. Sprinters have plenty ACTN3 protein of their cells, in order that she can also additionally have copies of the A1 gene variant. This way Jackie has as a minimum one a dead ringer for the A1 gene allele. People with one or variations of the A1 gene variant, on the alternative hand, are not often a success lengthy-distance runners. What is an enzyme?Enzymes are proteins that assist accelerate metabolism, or the chemical reactions in our our bodies. They construct a few materials and ruin others down.
Thus it is clear.
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What three numbers are always the same?
Mass Number, Protons, Neutrons
Atomic Number, Protons, Electrons
Protons, Neutrons, Mass Number
Protons, Neutrons, Electrons
Which explanation correctly describes why it is important for a cell’s surface-area-to-volume ratio to not be too small?
A. The area of the cell membrane needs to be large in comparison to the volume so the cell is able to move nutrients and wastes through it.
B. The cell would starve.
C. The cell would not produce enough waste material.
D. The organelles would grow too large to fit within the cell.
A woman weighing 600 N is leaning on the ground with shoe soles with a total area of 0.04 m2. Calculate the pressure of the motors
Answer:
1.5×10^4
Explanation:
Pressure= force/area
P= 600/0.04
P= 15000
P= 1.5×10^4