Answer:
gonna check them rn :) youre not d u mb dont worry (:
Which statement about Niels Bohr’s atomic model is true?
Answer:
I believe your answer is B. Each orbit has a specific energy level.
Hope this helped!
Why are crystal clues used to identify metamorphic and igneous rocks, but not sedimentary rocks?
Answer:
because there is not enough pressure to form a crystal in sedimentary rocks. This is my understanding
Explanation:
Please correct me if wrong.
3000 grams of heptane is combusted with 25000 grams of oxygen. C7H16 + O2 --> CO2 + H2O a) What is the limiting reactant? b) How many grams of carbon dioxide is produced? c) How many grams of excess reactant are left?
Heptane is limiting while oxygen is in excess. The mass of carbon dioxide produced would be 9,223.62 grams, while excess oxygen would measure 14,461.12 grams
Stoichiometric reaction
From the equation of the reaction:
C7H16 + 11O2 --> 7CO2 + 8H2O
Mole ratio of C7H16 to O2 = 1:11
Mole of 3000 g heptane = 3000/100.21
= 29.94 moles
Mole of 25000 g O2 = 25000/32
= 781.25 moles
Thus, O2 is in excess and heptane is limiting.
Mole ratio of heptane and CO2 = 1:7
equivalent mole of CO2 = 29.94 x 7 = 209.58 moles
Mass of 209.58 moles CO2 = 209.58 x 44.01
= 9223.62 grams
Excess mole of O2 = 781.25 - (29.94x11)
= 781.25 - 329.34 = 451.91 moles
Mass of 451.91 moles of O2 = 451.91 x 32
= 14,461.12 grams excess oxygen.
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A small amount of americium-241 is used in smoke detectors. A stream of radiation flows between two electrodes. If smoke interrupts the stream, the alarm goes off. What feature of the radioisotope americium-241 would be most helpful for the smoke detector to work? long half-life short half-life over-sensitive detection less sensitive detection.
The most helpful feature of the radioisotope americium-241 for the smoke detector to work is its Long half-life.
What is Half-Life?
Half-life is the time required for a quantity to reduce by half to its initial value. The half-life of any radioisotope is represented by [tex]t_{1/2}[/tex] .
Americium-241 (²⁴¹Am) is the most common isotope of americium.
Americium-241 has a half-life of 432 years.
Am-241 decays by emitting alpha particles and gamma radiation to become neptunium-237.
Thus, the most helpful feature of the radioisotope americium-241 for the smoke detector to work is its Long half-life.
To understand more about radioactivity, refer to the link:
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Smoke detectors are the safety devices for fire protection that detects smoke and gives alarms as a warning. The long half-life of the radioisotope would be most practical for the detector.
What is a long half-life?Radioisotopes are chemical substances that have unstable neutrons, protons and some amount of excess energy. They have a half-life which is the time by which they get reduced or decay to half quantity.
Americium-241 is the radioactive isotope of americium and have a half-life of 432.2 years. It helps in the alarm as the smoke particle disrupt the electric current produced by the isotope and results in the warning of the device to go on.
Therefore, option A. long half-life is the feature that would be most useful for the smoke sensor.
Learn more about radioisotopes and half-life here:
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Calculate the number of C atoms in 0.419 mol of C
Answer:
2.52[tex]x10^{23}[/tex] atoms*
Explanation:
[tex]\frac{0.419mol}{1} *\frac{6.02*10^{23}atoms }{1 mol} =2.52238x10^{23}[/tex]atoms
*i put the answer in correct sig figs(significant figures) in case your teacher is like mine and wants answers like that
Which of the following statements is true?
Conduction does not work in fluids because the molecules are too far apart.
Radiation does not work in solids because the molecules are too close together.
Heat lost from friction is usually easy to recapture and use.
Heat is transfered through space by convection.
Answer:
D
Explanation:
Heat is transfered through space by convection.
What is the name of Cu4C?
Answer: Copper (I) Carbide
Explanation:
Copper is a polyatomic ion, meaning it has multiple charges. Carbon has an outer shell consisting of 4 valence electrons so it can either add or lose 4 electrons so it’s charge can be -4 or +4. As said Copper has multiple charges but they are positive, so in this case Cu4 would be 4 +1 charges compared to C which would be -4. Therefore this is a 4:1 ratio, meaning Cu4C is Copper (I) Carbide
hope this helps :)
Why is it important for scientists to use the scientific method? O A. The scientific method helps scientists get accurate, repeatable results. B. Using the scientific method means that the results will support the hypothesis. C. Scientists would not ask questions if the scientific method were not used. D. Experiments would not produce any data without the scientific method.
Answer:
Answer A
Explanation:
Because that method is important to help the scientist
It is important for scientists to use the scientific method because The scientific method helps scientists get accurate, repeatable results. Therefore, option A is correct.
What do you mean by the scientific method ?The term scientific method is defined as the process of objectively establishing facts through testing and experimentation.
The basic process including making an observation, forming a hypothesis, making a prediction, conducting an experiment and finally analyzing the results.
The Scientific Method is a process used to confirm observations while minimizing observer bias. Its goal is for research to be conducted in a fair, unbiased and quotable manner.
Thus, It is important for scientists to use the scientific method because The scientific method helps scientists get accurate, repeatable results, option A is correct.
To learn more about the scientific method, follow the link;
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#SPJ2
What type of bond holds the complementary bases together?.
Answer:
hydrogen bonding
Explanation:
The two strands of DNA are held together by hydrogen bonds between complimentary nucleotides.
how many moles of AI are necessary to produce 5.92 miles of hydrogen gas
Answer:
ok
Explanation:
why I needed to give a answer to a question. I want to ask the question. brainly solve this issue. i cant ask questions without answering to 1 questions.
What does it mean by " Temperature uniform " and " Temperature not uniform "
I will mark u brainliest if you answer me right.
Answer:
A uniform temperature distribution is a MACROscopic property where the temperature is measured to be the same throughout the volume measured. An ideal gas with a uniform temperature distribution would have a Bellman distribution of kinetic energy of microscopic particles.
Explanation:
I am walter white
Calculate the mass of 3.00 moles of SeBr2
Is melting an ice cube a physical or chemical change.
If a solution is undergoing a reaction where co2 is being used as a reactant, what color is the phenol red-containing solution shifting toward?.
The colour of the phenol red-containing solution would shift toward yellow.
The reaction of CO2 with other compoundsCarbon dioxide is a colourless and acidic gas that is found in trace amounts in the atmosphere. When it reacts with water, carbonic acid is formed.
One of the properties of an acid is that it has the ability to turn blue litmus paper to red.
When Carbondioxide is used as a reactant, the phenol red-containing solution will shift toward yellow because the pH of the solution is less than 7 and turns blue as carbon dioxide is consumed and the pH of the solution rises to 7 or greater.
Note that acidity is pH of 0- 6 and basic solutions are from 8 - 14 in a pH scale.
Therefore, the colour of the phenol red-containing solution would shift toward yellow.
Learn more about acids here:
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SOMEONE HELP ME PLEASE
Answer:
high kinetic
Explanation:
I just did it
Answer: the answer is high kinetic energy
Explanation:
Help please I will give a lot of point
The flame colour produced by metal ions is due to electrons returning to lower energy levels after being excited to higher energy levels.
Cu2+ ions gives a deep green coloured flame.Na+ ions give a golden yellow-coloured flame.Li+ ions gives a red-coloured flame.Ca2+ ions gives a brick red-coloured flameWhat is a flame test?A flame test is a test used to identify metal ions in solution due to the characteristic colour the flame produces.
Flame colors are produced when the electrons in the metal ions present in the compound move between energy levels after excitation.
The difference in the colour of the flame depends on the difference in the energy levels of the electrons moving.
A solution of Cu(NO3)2 contains Cu2+ ions.
Cu2+ ions gives a deep green coloured flame.
A solution of Na2SO4 contains Na+ ions.
Na+ ions give a golden yellow-coloured flame.
A solution of Li3PO4 contains Li+ ions.
Li+ ions gives a red-coloured flame.
A solution of Ca(C2H3O2)2 contains Ca2+ ions
Ca2+ ions gives a brick red-coloured flame
Therefore, the colour of the flame produced by metal ions is due to electrons returning to lower energy levels after being excited to higher energy levels.
Learn more about flame test at: https://brainly.com/question/10003494
When solving net force problems, arrows going opposite directions means you subtract the Newtons.
True
or false
It's actually true hope it helps.
temperature is a measure of how much heat you have in, or around you. is it true or false
Your answer is
true
hope it helps you
What is the correct representation of ammonium chloride dissolved in water?.
Answer: Aqueous Ammonium Chloride
Explanation: When you disintegrate ammonium chloride crystal in water (H2O), the ammonium chloride compound decomposes into allure component ions: NH4+ and Cl-. The detachment related series of events is: NH4Cl(complete) = NH4+(liquid) + Cl-(liquid).
Power gathered from the sun and wind?
A
is considered a nonrenewable resource.
B
can provide humans with energy forever.
C
can only be used in the daytime.
D
is not a natural resource.
30 points
Your answer is B
Sun and wind are considered renewable energy, meaning that it won't polute the Earth. And as far as I know, the Sun and wind can't really run out. So it can last a very long time!
Hope this helps!
-Daisuke
It takes 78.2 J of energy to raise the temperature of 45.6g of lead by 13 degrees celsius. What is the specific heat of lead?
Pls Help!!!!
Answer:
Q = mcΔt but this time rearrange to find for c
Explanation:
Q or energy = 78.2J
mass of lead = 45.6g
Specific heat capacity of lead = ????
Δt = 13°C
Q = mcΔt
Rearrange the equation to find for c
c = Q / m x Δt
c = (78.2) / (45.6) x (13)
c ≈ 0.132 J °C
Molecules at a higher temperature have _______ kinetic energy, speed, and momentum compared to molecules at a lower temperature.
Answer:
Molecules at a higher temperature have higher/more kinetic energy, speed, and momentum compared to molecules at a lower temperature.
Explanation:
How to Separate Iodine and sulfur by technique of saparation
A mixture of iodine and sulphur can be separated by adding Carbon disulphide that is (CS₂) then stir the solution and filter it . As sulphur dissolved in CS₂, so it come into filter and got separated from the mixture.
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all of them are right
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What is the difference between heavy cream and heavy whipping cream?.
Answer: The main difference between the two is their fat content. Heavy cream has slightly more fat than whipping cream. Otherwise, they are nutritionally very similar. You can use them interchangeably in recipes without affecting the taste, although they may lead to different consistencies.
Explanation:
What is the relationship between absorbance and transmittance of a sample in a spectrophotometer?
- indirect
- Direct
- No relationship
Plz help!!
what is the symbol of the periodic table for aluminum
Answer:
Al
Explanation:
Al = Aluminum
Chloroform (CHCl3), an important solvent, is produced by a reaction between methane and chlorine.
CH4(g) + 3 Cl2(g) CHCl3(g) + 3 HCl(g)
How many grams of CH4 is needed to produce 56.0 g CHCl3?
A large hamburger sandwich contains 628 kcal and 36 grams of fat. Approximately what percentage of the total energy is contributed by fat
The percentage of the total energy contributed by fat = 51.59% of fat
Calculation of total energy in fatThe quantity of fat in the hamburger = 36grams
But 1 gram of fat = 9 kcal( standard energy value per gram of fat).
That is , 9kcal = 1 gram
X kcal = 36 grams
cross multiply,
X kcal = 9 × 36
= 324kcal
To calculate the percentage of 324kcal of fat in 628 kcal,
[tex]\% = \frac{324}{628} \times \frac{100}{1} [/tex]
[tex]\% = \frac{32400}{628} [/tex]
% = 51.59% of fat
The percentage of the total energy contributed by fat = 51.59%
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In Florida, the beaches are often exposed to hurricanes originating in the Atlantic Ocean. Which of the following is the most reasonable prediction of what could result from a hurricane?
OPTIONS
Creating of new rivers at high elevations
Movement of sand from the beach to offshore sandbars
The generation of local earthquakes after the storm
The creating of new river deltas along the beaches
Answer:
who's asking?
Explanation: