Explanation:
To solve that deadlock problem, in 1913 Bo kept Rizopho's model of planetary atom and combined with Plang quantum theory, he produced a hydrogen atom model with the following three determinations: - In atoms, The clectron cannot orbit any other, but only rotates with a certain number of orbits. Each "allowed" orbit is equivalent to a certain energy. - When rotating in "allowed" orbits, electrons do not lose energy, meaning they do not emit radiation, but emit radiation only when the electron jumps from an orbit with the high energy level in the orbit corresponding to the the low energy and the household energy of radiation are equal to the difference of the two energy levels. - - When rotating in those "allowed" orbits, the electron has a momentum moment that is an integer times of h / (2π).
15. An electrically neutral atom consists of 15 neutrons, 13 electrons, and a number of protons. What is its mass number?
Answer:
28
Explanation:
it states that the atom is neutral, meaning the number of electrons and protons are the same. so if there are 13 electrons, there are 13 protons. And the mass number is neutrons plus protons. So 13+15 is 28
Calculate the following to the correct number of significant figures 0.0041 cm x 2.00 cm
x 501 cm
Answer:
4.1 cm³
Explanation:
When multiplying, the product must have the same number of significant figures as the factor with the least number of significant figures. 0.0041 has two significant figures, 2.00 has three significant figures, and 501 has three significant figures. The answer will have 2 significant figures.
0.0041 cm × 2.00 cm × 501 cm
= 4.1082 cm³
≈ 4.1 cm³
Calculate 1.23 m x 0.89 m and give your answer with the correct number of significant figures?
Answer:
1.1m that what I got and it said it was right
The calculation of the given figure to one significant figure is[tex]1.1 m^{2}[/tex]
Significant figures can be regarded as a number of digits that is present in a particular value.Given 1.23 mAnd 0.89 m
If we multiply we have[tex]( 1.23*0.89) = 1.0947[/tex]
Since, there is no definite significant figure given, I will assume one significant figure.To do this we start to count significant figures starting from first non-zero digit to the actual figure we are requested to stop.We can see that 9 is after zero, the we round off that 9 then it will become 1 , Then the value to one significant figure is [tex]1.1m^{2}[/tex]Therefore, the multiplication of the values to one significant figure is [tex]1.1^{2}[/tex]
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What role does DNA play in living organisms?
Answer: a nucleic acid that contains the genetic instructions for the development and function of living things
Explanation:
An electron is approximately 0.05% of the mass of a proton. Protons and neutrons each have a mass of 1 amu. Which of the following best describes the relationship between mass and subatomic particles?
A. The mass of an electron is equal to that of a neutron
B. Atomic mass is the total number of protons and electrons
C. A neutron has 0.05% more mass than an electron
D. The nucleus comprises over 99% of the atom's mass
Answer:
D. The nucleus comprises over 99% of the atom's mass.
Explanation:
Which of the following best describes the relationship between mass and subatomic particles?
A. The mass of an electron is equal to that of a neutron. FALSE. The mass of an electron is ≈1/1,840 of that of a neutron.
B. Atomic mass is the total number of protons and electrons. FALSE. Atomic mass is the total number of protons and neutrons.
C. A neutron has 0.05% more mass than an electron. FALSE. A neutron has 0.05% more mass than a proton.
D. The nucleus comprises over 99% of the atom's mass. TRUE. The nucleus comprises protons and neutrons.
Which statement refers to the quantum mechanical model? A) Electrons move in a circular path about the nucleus. B) Electrons can lose energy and fall into the nucleus. C) Electrons are in "orbitals", regions of space where there is high probability of being found. D) An electron can move from one circular path to another only when it absorbs or emits energy corresponding to the exact difference between the two energy states.
Answer:
Electrons are in "orbitals", regions of space where there is high probability of being found.
Explanation:
The Wave mechanical model of the atom does not restrict the electrons to certain energy levels only as in the Bohr's model, instead it describes a region around the nucleus called an orbital, where there is a high probability of finding an electron with a certain amount of energy.
Each energy level is composed of one or more orbitals and the distribution of electrons around the nucleus is determined by the number and kind of energy levels that are occupied.
carry out this problem 2.4g/mlx15.82ml
Answer:
Explanation:
i dont really know
PLEASE HELP !!! Read the passage below and use it to answer the question. Rainforests have four basic layers. The tallest trees are part of the emergent layer, which can be as much as 60 m above the ground. The sunlight is bright and hot here, and the wind can be strong. The main layer of the rainforest is the canopy, more than 20 m above the ground. It is made up of the leaves and branches of tree tops. The air here is still and very moist. The canopy blocks out most of the sunlight. Smaller trees, vines, and other plants make up the understory, which is less than 12 m above the ground. This layer is damp and warm with very little sunlight. The forest floor is dark, warm, and moist. Decomposers break up fallen leaves and other dead matter here. Which of the following graphs best presents one of the abiotic factors of a rainforest?
Answer:
Read the back of glossary
Explanation:
Read pages
Answer:
hi A
Explanation:
i need the points please
Isaac Newton believed that light was made of
O waves.
O particles.
O dust.
O gravity.
Explanation:
particles
Answer: particle
Explanation:
The light make small particle of wave
Choose all the answers that apply. What do all cells do? reproduce contain hereditary information have a nucleus break down food into energy have a cell membrane
Answer:
contain hereditary information
break down food into energy
Explanation:
Hereditary information is contained in genes and genes are found inside the cell. This implies that the cell contains hereditary information of organisms. This hereditary information is passed on during cell division from parent to daughter cells.
Metabolism occurs in the cells. The cells use oxygen to break down food materials to produce energy.
To practice for an Ironman competition, John rode his bike for 15 kilometers. How many
meters did he ride?
Answer:
15000
Explanation:
1000 Meters in a kilo meter. So multiply 15 by a 1000.
Does more data mean more reliable results or less
Answer:
more reliable. The more results the better results you get.
Explanation:
Answer:
more reliable results
Explanation:
hey there,
< More data is more reliable results as you can see even more about the experiment you are doing! If you only know one other scientist that had done the experiment and it worked for him, then that's not enough data, but if you have thousands of scientists that were able to do the experiment correctly, you will have a more reliable and correct result since now you have more data. >
Hope this helped! Feel free to ask anything else.
The answer choices are
-solid
-liquid
-gas
Answer:
solid, gas
Explanation:
gasses are very low density because there is a low mass in a large volume with lots of space between atoms, solids on the other hand are very densely packed and there is very little room between atoms
What are the four categories commonly used to classify chemicals and chemical agents in the graphic communications industry
Answer:
Organic
Plate making
Ink mists
Gas, fumes and dust
Explanation:
the four categories commonly used to classify chemicals and chemical agents in the graphic communications industry are Organic ,Plate making ,Ink mists, Gas, fumes and dust.
Organic refer to those chemicals gotten from living matter and are natural.
Plate making refers to how plates are make and it carry image in the printing process.
Ink mist gotten from ink is use in graphic designs for painting and color indication.
i'll GIVE BRAINLY
5. Label the following measurement by the quantity it represents: 37 s * A. Density B. Time C. Temperature D. Distance
Answer:
Hey there!
35 s represents time.
The s means "seconds."
Let me know if this helps :)
A gas has a volume of 150 cm3. Convert this volume into mL
Answer:
The answer is
150 mLExplanation:
To convert the volume from cm³ to mL we use the conversion
1 cm³ = 1 mL
So from the question
if 1 cm³ = 1 mL
Then 150 cm³ = 150 mL
Hope this helps you
WILL GIVE BRAINLETS
What is the landform in the image? A.Dune B.Hill C.Plateau D.River
Answer:
the answer is c
Explanation: bc it can't be a hill or a river and a dune no way so it is c a PLATEAU
hope this helped have a great day
When sugar is dissolved in water and mixed well the resulting solution is classified as a
Answer:
homogeneous mixture
Explanation:
How many grams of carbon (C) would be present in carbon monoxide (CO) that contains 2.666 grams of oxygen (O)?
Answer:
Explanation:
Given :
Mass of oxygen containing carbon monoxide (CO) is 2.666 gram .
To Find :
How many grams of carbon (C) would be present in carbon monoxide (CO) that contains 2.666 grams of oxygen (O) .
Solution :
By law of constant composition , a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source and method of preparation.
So , volume of solution does not matter .
Moles of oxygen ,
Now , molecule of CO contains 1 mole of C .
So , moles of C is also 0.167 mole .
Mass of carbon ,
Therefore , mass of carbon is 2 grams .
Hence , this is the required solution .
matter that has a uniform and defined composition is called a
2. Is it true thatOnly the stratosphere contains enough air for living things to breathe?
Answer:
I'm pretty sure that's false.
Explanation:
Which phrase is the best definition of science?
Answer:
Science is the information gathered through study.
Explanation:
Answer:Observation of the physical world.
Explanation:
Joshua uses his thermometer (experimental value) and finds the boiling point of ethyl alcohol to be 75°C 75 ° C . The accepted value of ethyl alcohol is 80°C 80 ° C . What is his percent error?
75-80 = 5 = .0625 X 100 = 6.25%
80 80
Which is the larger? 27 kilograms or 270 grams?
Answer: 27 killograms
Explanation: 1kg = 1000 grams
27 kilograms =27000 grams
Write a brief paragraph that shows that you understand the following terms and relationships between them: atom, well I kill compound, and element.
Answer:
Atom are smaller particles of an element
compounds are mixture of two element
Element are combination of compounds
Explanation:
When an element is breakdown into smaller particles it becomes an atom
Complete the following calculation. Round off the answers to the correct
number of significant figures.
2.30 m x 3.65 m x 0.55 m
Plz help thank you!
Answer:
uhh can ya specify plezz
Explanation:
Which of the following is not a possible effect of increasing carbon dioxide levels in the atmosphere?a.increase in water contamination and floodsb.ocean acidificationc.cutting down forestsd.reduction of cold-related deaths Please select the best answer from the choices providedABCD
Answer:
b
Explanation:
The only option that is not an effect of increasing carbon dioxide levels in the atmosphere is cutting down forests.
An increasing level of carbon dioxide in the atmosphere causes ocean acidification due to the dissolution of the gas in the oceans. Carbon dioxide also causes global warming - an increase in the average global temperature due to the heat (from the sun) absorbing ability of the gas.
Global warming causes an increase in the level of seas and oceans as a result of the melting of glaciers and polar ice caps. The rise in sea levels causes flooding with associated loss of habitats and biodiversity.
The increase in global temperature also means that cold-related deaths will reduce.
Correct option: b
Answer:
C. cutting down forests
Explanation:
edge test
2. How have fossils been preserved over millions of years?
Answer:A fossil is the remains or traces of a once-living plant or animal that was preserved in rock or other material before the beginning of recorded history. ... Fossils of single-celled organisms have been recovered from rocks as old as 3.5 billion years. Animal fossils first appear in rocks dating back about 1 billion years.
Explanation:
Five
Five types of fossils: (a) insect preserved in amber, (b) petrified wood (permineralization), (c) cast and mold of a clam shell, (d) pyritized ammonite, and (e) compression fossil of a fern.
A) accelerated upward. B) slowed and then stopped. C) moved at a constant velocity. D) increased its speed rapidly.
Answer:
A because the line is showing accelerated upward.
Explanation:
A 42.0g sample of compound containing only C and H was analyzed. The results showed that the sample contained 36.0g of C and 6.0g of H.
Which of the following questions about the compound can be answered using the results of the analysis? (choose 1 option)
A) What was the volume of the sample?
B) What is the molar mass of the compound?
C) What is the chemical stability of the compound?
D) What is the empirical formula of the compound?
Answer:
D) what is the empirical.formular of the compond
Explanation:
this is because we have two elements and to calculate the empiral formula we need to have their masses which is also given