What % of all the atoms in the universe are hydrogen
Answers
Answer:
Over ninety percent of all the atoms in the Universe are hydrogen atoms.
Explanation:
Over ninety percent of all the atoms in the Universe are hydrogen atoms. By mass, hydrogen makes up about 75% of all matter in the Universe. Hydrogen atoms are also the smallest and lightest of all the atoms with only one electron and one proton in a common single hydrogen atom (called protium).
Related Questions
Put the following elements in order, with the element having the most valence electrons at the top of your list and the element with the fewest valence electrons at the bottom.swap_vertAstatine (At)swap_vertArsenic (As)swap_vertCalcium (Ca)swap_vertSodium (Na)swap_vertOxygen (O)swap_vertSilicon (Si)swap_vertAluminum (Al)
Answers
answer
1. Neon
2. Astatine
3. oxygen
4. Arsenic
5. Silicone
6. Aluminium
7. Calcium
8. Sodium
melting of candle wax
Answers
Answer:
I don't understand what you mean
Answer:
Physical Change
Explanation:
Melting of Wax Is a Physical Change but Burning of Wax Is a Chemical Change: Melting of wax, by itself, involves a change of state from solid to liquid.
Briefly discuss the application of 234Th to determining particle
fluxes in the ocean
Answers
The application of 234Th to determine particle fluxes in the ocean is known as the Thorium method.
In this method, the measurement of the decay rate of 234Th (half-life of 24.1 days) is used to determine the amount of sinking particles.
The 234Th is introduced into the surface ocean by decay of 238U. The dissolved 234Th is quickly adsorbed onto sinking particles and carried to the deep ocean with the settling particles.Because the decay rate of 234Th is faster than the sinking rate of particles, the excess of 234Th is found in the water column below the production zone.
The Thorium method determines the sinking rate of particles by measuring the excess of 234Th in the water column. It is a useful method to measure particle fluxes in the ocean as the Thorium method offers high resolution and can be used over a wide range of ocean environments.
Thus, this application is known as Thorium method.
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can u see water vapour by a microscope?
Answers
Answer:
It can be formed either through a process of evaporation or sublimation. Unlike clouds, fog, or mist which are simply suspended particles of liquid water in the air, water vapour itself cannot be seen because it is in gaseous form
Explanation:
hope it help
Answer:
No. Unlike clouds, fog, or mist which are simply suspended particles of liquid water in the air, water vapour itself cannot be seen because it is in gaseous form
TRUE OR FALSE
Astronomers use spectroscopes to identify elements in stars because each element produces
unique emission spectrum
Answers
Answer:
True!
Explanation:
A spectrum is simply a chart or a graph that shows the intensity of light being emitted over a range of energies. Have you ever seen a spectrum before? Probably. Nature makes beautiful ones we call rainbows. Sunlight sent through raindrops is spread out to display its various colors (the different colors are just the way our eyes perceive radiation with slightly different energies).
Hope i helped!
1. Which property makes metals good conductors of electricity?
A. The electrons in a metal can move freely.
B. The positively charged metal ions attract free electrons around them.
C. The electrons are shared equally by all of the atoms that make up the metal.
D. The negative charge of the electrons cancels the positive charge of the metal ions.
Answers
Answer:
I think it will be A
7. Marcie fills a graduated cylinder with 15.0mL of water. Paul finds the mass of a marble to be
2.21g, then drops the marble into the graduated cylinder. If the meniscus on the cylinder is
now at 16.3mL, what is the density of the marble?
Answers
Answer:
1.7 g/mLExplanation:
The density of a substance can be found by using the formula
\(density = \frac{mass}{volume} \\\)
From the question
volume = final volume of water - initial volume of water
volume = 16.3 - 15 = 1.3 mL
We have
\(density = \frac{2.21}{1.3} = 1.7 \\ \)
We have the final answer as
1.7 g/mLHope this helps you
In the reaction: I2 + ClO3− → IO3− + Cl−, indicate:a. the element that is oxidized: b. the element that is reduced: c. the reducing agent: d. the oxidizing agent: e. Balance the reaction
Answers
1) Which element is oxidized
\(I_2+ClO^-_3\rightarrow IO^-_3+Cl^-\)Oxidation numbers
I2: 0
ClO3-: for Cl +5 and for O is -2
IO3-: for I is +5 and for O -2
Cl-: -1.
According to the oxidation number
a. Iodine (I) has been oxidized. It changed from 0 to +5.
b. Chlorine has been reduced. It changed from +5 to -1
2) reducing agent and oxidizing agent
c. A reducing agent donates electrons. In the reaction, Iodine is the reducing agent.
d. An oxidizing agent accepts electrons. In the reaction, Chlñorine is the oxidizing agent.
3) Balancing the chemical equation
\(I_2+ClO^-_3\rightarrow IO^-_3+Cl^-\)Step 1: break the reaction into two half-reactions.
Oxidation half-reaction
\(I_2\rightarrow IO^-_3\)Reduction half-reaction
\(ClO^-_3\rightarrow Cl^-\)Step 2: balance all elements EXCEPT for hydrogen and oxygen
Oxidation half-reaction
\(I_2\rightarrow2IO^-_3\)Reduction half-reaction
\(ClO^-_3\rightarrow Cl^-\)Step 3: Balance OXYGEN. We do so by adding water molecules to the half-reactions as needed.
Oxidation half-reaction
\(I_2+6H_2O\rightarrow2IO^-_3\)Reduction half-reaction
\(ClO^-_3\rightarrow Cl^-+3H_2O\)Step 4: Balance HYDROGEN. We do so by adding protons (H+) to the half-reactions as needed.
Oxidation half-reaction
\(I_2+6H_2O\rightarrow2IO^-_3+12H^+\)Reduction half-reaction
\(ClO^-_3+6H^+\rightarrow Cl^-+3H_2O\)Step 5: Balance CHARGES. We do so by adding electrons
Oxidation half-reaction
\(I_2+6H_2O\rightarrow2IO^-_3+12H^++10e^-\)Reduction half-reaction
\(ClO^-_3+6H^++6e^-\rightarrow Cl^-+3H_2O\)Step 6: Multiply each half-reaction in such a way we can cancel the electrons.
Oxidation half-reaction
\(3\cdot(I_2+6H_2O\rightarrow2IO^-_3+12H^++10e^-)\)New oxidation half-reaction
\(3I_2+18H_2O\rightarrow6IO^-_3+36H^++30e^-\)Reduction half-reaction
\(5\cdot(ClO^-_3+6H^++6e^-\rightarrow Cl^-+3H_2O)\)New reduction half-reaction
\(5ClO^-_3+30H^++30e^-\rightarrow5Cl^-+15H_2O\)Step 7: combine the half-reactions. We have 30e in the reactants and 30e in the products. We can cancel them and combine the remaining species.
New oxidation half-reaction
\(3I_2+18H_2O\rightarrow6IO^-_3+36H^++30e^-\)New reduction half-reaction
\(5ClO^-_3+30H^++30e^-\rightarrow5Cl^-+15H_2O\)Overall reaction
\(3I_2+18H_2O+5ClO^-_3+30H^+\rightarrow6IO^-_3+36H^++5Cl^-+15H_2O\)Step 8: Balance the reaction by reducing the number of water molecules and protons.
Overall reaction
\(3I_2+3H_2O+5ClO^-_3^{}\rightarrow6IO^-_3+6H^++5Cl^-\)e. Balance the reaction
\(3I_2+3H_2O+5ClO^-_3^{}\rightarrow6IO^-_3+6H^++5Cl^-\).
A sample of gas occupies 15.0 liters at a pressure of 2.00 atmosphere and a temperature of 300. K. If the pressure is lowered to 1.0 atmosphere and the temperature is raised to 400. K, the volume of the gas sample would be?
Answers
Answer:
THE NEW VOLUME OF THE GAS SAMPLE IS 40 L AT 1 atm AND 400 K
Explanation:
Using general gas equation which combines Boyle's and Charles' law, the volume of the gas sample at the new pressure and temperature can be obtained.
P1V1/T1 = P2V2/T2
P1 = Initial pressure = 2 atm
V1 = Initial volume = 15 L
T1 = Initial temperature = 300 K
P2 = Final pressure = 1 atm
T2 = Final temperature = 400 K
V2 = Final volume = unknown
Substituting the values into the equation, we have;
V2 = P1V1T2 / P2 T1
V2 = 2 * 15 * 400 / 1 * 300
V2 = 12 000/ 300
V2 = 40 L
The new volume after the pressure was reduced to 1 atm and the temperature increased to 400 K is 40 L.
Your simulation involved 100 atoms and eight half-life cycles. For half-life cycles 9 and later, how many radioactive nuclei would you expect to be present?
Answers
Answer:
you would expect 0 radioactive nuclei to be present
Explanation:
got it right on the assignment
NEED HELP!! What types of waves are transmitted from the H-E-L-P device ?
Answers
Answer:
What do you mean need more details
Explanation:
Since a help device is a a communication gadget, we know that the help device will make use of radio waves.
What is a help device?A help device refers to a device that can be used for emergency communication. They are basically communication gadgets.
We must note that our communication gadgets such as television, radio, cell phone etc all make use of radio waves. Hence a help device would make use of radio waves.
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What expressions give shte amonunt of light energy that is conerted to oteer forms between the fluresnce excitation anf emission events?
Answers
The expressions which give something amount of light energy that is converted to other forms between the fluorescence excitation and emission events is:
E = hf = hc/λ
Where;
h = 6.62 × 10 −34 Js
c = 3 × 10 8 m/s.
What is energy?Energy can simply be defined as the capacity of doing work.
There are different forms or types of energy. These are:
Mechanical energyLight energyNuclear energyKinetic energyPotential energySo therefore, the expressions which give something amount of light energy that is converted to other forms between the fluorescence excitation and emission events is:
E = hf = hc/λ, where h = 6.62 × 10 −34 J and c = 3 × 10 8 m/s.
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What initiates release of neurotransmitters into the synapse? O Depolarization opens Ca2* channels, allowing Ca2+ to move vesicles to the synaptic membrane. O Hyperpolarization opens K* channels, allowing K* to move vesicles to the synaptic membrane. O Depolarization opens Na* channels, allowing Na* to move vesicles to the synaptic membrane. O Depolarization opens K* channels, which opens fusion pores in the postsynaptic membrane. O Hyperpolization opens Ca2+ channels, which opens fusion pores in the postsynaptic membrane. 2 pts
Answers
The release of neurotransmitters into the synapse is initiated by depolarization, which opens Ca2+ channels, allowing Ca2+ to move vesicles to the synaptic membrane.
This is the correct answer.When an action potential (AP) arrives at the axon terminal, it results in the opening of voltage-gated Ca2+ channels. The influx of Ca2+ into the nerve terminal causes the exocytosis of neurotransmitter-containing vesicles into the synaptic cleft. Calcium influx is thought to trigger neurotransmitter release via a mechanism that involves Ca2+ binding to the vesicle-associated protein synaptotagmin 1 (Syt1), which promotes the interaction of vesicles with the presynaptic membrane.The entry of Ca2+ through voltage-gated calcium channels is critical for neurotransmitter release, and its absence leads to severe neurological disorders such as ataxia and epilepsy. Calcium ion (Ca2+) is one of the most crucial signaling molecules in cells and is essential for many physiological functions, including neurotransmitter release. Calcium ions activate synaptic vesicle fusion and neurotransmitter release by binding to specific proteins in the active zone of the nerve terminal.
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A solution of NaCl was prepared in the following manner: 0.0842 g of NaCl is massed out on an analytical balance. The solid is transferred to a 25.00 mL volumetric flask. Deionized water is added to the flask such that the bottom of the meniscus is at the line. A 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask using a volumetric pipet and diluted to volume. 6. Calculate the concentration of NaCl in the resulting solution in mg/L NaCl. (answer = 67.4 mg/L) 7. Calculate the concentration of NaCl in the resulting solution using propagation of error through the calculation. Use the manufacturer's tolerance values as the absolute error. The tolerances can be found in Chapter 2 of the Harris text. Assume a Class 1 balance and Class A glassware. Treat the tolerances as random error. (answer = 67.4+0.4 mg/L) 8. Identify 2 possible sources of random (indeterminate) error. Identify 2 possible sourses of systematic (determinate) error.
Answers
Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl
To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7. Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.
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Please help
Solid sodium reacts with fluorine gas.
The theoretical yield of the reaction is calculated as 28.2 g NaF.
25.9 g NaF were recovered after the reaction.
What is the percent yield of for the reaction?
2Na + F2 → 2NaF [ ? ]%
Answers
Considering the definition of percent yield, the percent yield for the reaction is 91.84%.
Definition of percent yieldThe percent yield is the ratio between the actual yield and the theoretical yield expressed as a percentage.
The percent yield is calculated as:
percent yield= (actual yield÷ percent yield)×100%
where:
The actual yield is the amount of product obtained from a chemical reaction.The theoretical yield is the amount of product that is obtained from the stoichiometric equation using the limiting reagent to determine the product.Percent yield in this case.In this case, you know:
Actual yield= 25.9 gTheoretical yield= 28.2 gReplacing in the definition of percent yield:
percent yield= (25.9 g÷ 28.2 g)×100%
Solving:
percent yield= 91.84%
Finally, the percent yield is 91.84%.
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choose the element with the higher ionization energy from each of the following pairs: Al or In Cl or Sb K or Ge S or Se
Answers
the elements with higher ionization energies in each pair are Al, Cl, Ge, and S.
I'd be happy to help you compare the ionization energies of these elements. Ionization energy generally increases across a period and decreases down a group in the periodic table. Based on this trend, we can determine the element with the higher ionization energy in each pair:
1. Al (aluminum) or In (indium): Al has a higher ionization energy because it's higher up in the same group.
2. Cl (chlorine) or Sb (antimony): Cl has a higher ionization energy as it is further to the right and up in the periodic table.
3. K (potassium) or Ge (germanium): Ge has a higher ionization energy because it's further to the right in the same period.
4. S (sulfur) or Se (selenium): S has a higher ionization energy as it is higher up in the same group.
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Iceland is an island nation right on the Mid Atlantic Ridge. On what type of boundary is Iceland located on?
Answers
Answer:
Iceland sits spanning the Mid-Atlantic Ridge tectonic plate boundary which separates the Eurasian and the North American plates.
Explanation:
Hope this helps!
Answer:
points
Explanation:
PLEASE HELP ME 100 POINTS RIGHT ANSWERS ONLY!!! :)
There are 8 g of chlorine in 2,000,000 g of water in a pool.
How many ppm chlorine are in the pool?
part/whole x 1,000,000
Answers
There are 4,000 parts per million (ppm) of chlorine in the pool.
To calculate the parts per million (ppm) of chlorine in the pool, we can use the formula:
ppm = (part / whole) x 1,000,000
In this case, the part is the amount of chlorine, which is given as 8 g, and the whole is the amount of water, which is 2,000,000 g. Substituting these values into the formula, we get:
ppm = (8 g / 2,000,000 g) x 1,000,000
Simplifying this expression, we find:
ppm = (4 x 10^-6) x 1,000,000
ppm = 4,000
This means that for every one million parts of the pool's water, there are 4,000 parts of chlorine. In other words, the concentration of chlorine in the pool is 4,000 ppm, indicating a relatively high level of chlorine compared to the water.
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how is human activity creating water pollution and depletion, and how can these effects be addressed while using water sustainably
Answers
The human activity creating water pollution and depletion are uses of fertilizers, detergents and chloro flouro carbon many other things.
What is water pollution?Water pollution is defined as the contamination of water bodies, usually as a result of human activity, in such a way that their lawful uses are harmed.
The activities of human that creating water pollution are:
Uses of fertilizersHarmful chemical in agricultureDetergents for washing clothesWastes from industriesAnd depletion in the ozone layer are due to halogen source gases, which contain chlorine and bromine atoms, are produced by human activities. These emissions into the atmosphere eventually contribute to ozone depletion in the stratosphere.
Hence human activities are uses of fertilizers, detergents and many other things.
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How many orbitals surround the nucleus in a neutral atom of sulfur (S)?
1
3
5
6
Answers
Argon (Ar): (Ne) 3s2 3p6
O longhand notation
O noble-gas notation
Answers
Answer:
It is Noble-gas notation
Explanation:
Just did it on Edgenuity 2020
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, the given electronic configuration represents noble-gas notation.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
The systematic distribution of electrons in the various atomic orbitals is called its electronic configuration. The atomic number of argon is 18. The electronic configuration of argon is (Ne) 3s² 3p⁶. 1,2,3 represents the number of shells and s and represents the orbitals. The superscripts represents the number of electrons in each orbitals. The given electronic configuration represents noble-gas notation.
Therefore, the given electronic configuration represents noble-gas notation.
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Explain why atoms can have different isotopes. In other words, how is it that helium can exist in three different forms?
Answers
Answer:
The number of protons, massive, positively charged nuclear particles defines the identity of the nucleus.
Woah. Vocabulary here.
An isotope is any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weight. There are 275 isotopes of the 81 stable elements, in addition to over 800 radioactive isotopes, and every element has known isotopic forms. Isotopes of a single element possess almost identical properties.
Helium is usually defined as an inert, gaseous element present in the sun's atmosphere and in natural gas, and also occurring as a radioactive decomposition product, used as a substitute for flammable gases in dirigible balloons. Symbol: He; atomic weight: 4.0026; atomic number: 2; density: 0.1785 g/l at 0 °C and 760 mm pressure.
Explanation:
The number of protons, massive, positively charged nuclear particles, gives Z, the atomic number, which defines the identity of the nucleus.
Z=1, "hydrogen",Z=2, "helium",Z=3, "lithium",...........Z=21, "scandium".
The nucleus may contain various numbers of neutrons, massive, neutrally charged nuclear particles, which gives to the existence of isotopes.
For hydrogen, \(Z=1\) by defintion. That is there is a proton in all hydrogen nuclei. Some hydrogen nuclei contain 1 neutron to give the deuterium isotope, \(^2H\) ; an even smaller number of hydrogen nuclei contain 2 neutrons, to give the tritium isotope, \(^3H\) ; Most atoms have a number of isotopes in different proportions.
To answer your question, the helium atom has \(Z=2\) ; i.e. there are 2 nuclear protons, which is what defines the atom as helium. The most common isotope of helium is \(^4He.^3He\) and \(^5He\) re known with vanishingly small abundances, and half lives.
This video discusses how to determine the number of subatomic particles in C-12 , C-14 , H-1 , H-2 and H-3 .
Thanks.
If a solution contains 20g of glycerol and 5g of coeine, what is the codeine percentage strength of the solution?
Answers
20%
The codeine percentage strength of the solution is 20%
The term "percent strength" describes the proportion of a material that has dissolved in a given volume of liquid. Knowing how parts relate to wholes is the secret of % strength: A percent is equal to x parts out of 100 overall.Meaning of percentage strengthThe amount of a liquid is often measured, and the % strength tells you how many parts by volume of the active ingredient are present. 100 parts by volume are included in the total volume of the solution or liquid preparation.How do you determine a solution's strength?Mass of solute times strength of solution(g) Amount of the solution(L)
The amount of solute dissolved in grams per liter of the solution is used to determine the solution's strength.It stands for the solution's potency or concentration.It uses grams per liter to express.To learn more about percentage strength visit:
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how many moles of ethane, C2H2, contains 4.87x10^24 molecules of ethane?
8.09 mol
9.09 mol
7.09 mol
Answers
8.09 grammes of ethane are equal to 4.87x1024 ethane molecules.
To determine the number of moles of ethane (C2H2) that contain 4.87x10^24 molecules of ethane, we can use Avogadro's number, which is approximately 6.022 x 10^23 molecules per mole.
First, we need to determine how many moles of ethane 4.87x10^24 molecules represents by dividing the number of molecules by Avogadro's number:
4.87x10^24 molecules / (6.022 x 10^23 molecules per mole) = 8.09 moles
Therefore, 8.09 moles of ethane contain 4.87x10^24 molecules of ethane.
In summary, to calculate the number of moles of a substance from a given number of molecules, we divide the number of molecules by Avogadro's number. In this case, 4.87x10^24 molecules of ethane is equivalent to 8.09 moles of ethane.
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Fill in the blanks and name the process.
What is the process of ____ reproduction where a cell makes ___ of itself?
Answers
Second blank: copies
problems in fetal development can be detected by studies on this fluid
Answers
The fluid referred to in the question is likely amniotic fluid, which surrounds the developing fetus in the womb. Amniotic fluid can be a valuable source of information for studying fetal development.
For example, abnormal levels of certain substances in the fluid can indicate a problem with fetal development. Additionally, genetic testing can be performed on cells that are shed by the fetus into the amniotic fluid. While amniotic fluid analysis can provide important insights into fetal development, it is not without its limitations. For example, the amount of fluid and the composition of the fluid can vary greatly among pregnancies, which can make it difficult to draw definitive conclusions from the results. Additionally, the procedure for collecting amniotic fluid (amniocentesis) carries a small risk of complications such as infection or miscarriage. Overall, studies on amniotic fluid can be an important tool for identifying potential problems in fetal development, but it is important to carefully weigh the potential benefits and risks of this procedure on a case-by-case basis.
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If 50. 75 g of a gas occupies 10. 0 l at stp, 129. 3 g of the gas will occupy ________ l at stp.
Answers
22.4L
of any gas contains 1 mol of that gas.
50.75g/10L*22.4L/1 mol= 113.68g/mol- this is the mole weight of your gas
1 mol/113.68g*129.3g=1.137403 mol
Set up a ratio
1.137403mol/x L=1 mol/22.4 L
X=25.477827L, or with sig figs, x=25.5L
A projectile moves horizontally with ____?____motion
HELP PLEASE
Answers
Answer:
hi
Explanation:
hi
how to get silver surfer in lego marvel superheroes
Answers
Silver Surfer is one of the many characters in the LEGO Marvel Superheroes game. He has some very interesting powers that make him a great asset to have on your team. In this article, we will be looking at how to get Silver Surfer in LEGO Marvel Superheroes.
To get Silver Surfer in LEGO Marvel Superheroes, you will need to complete his mission, called "The Good, the Bad, and the Hungry." This mission can be found in the "Exploratory Laboratory" area of the game. Once you have completed this mission, you will unlock Silver Surfer as a playable character.
This area is located in the northwest corner of the map. Once you are in the Exploratory Laboratory area, you will need to find the character that will give you the mission. The character's name is Stan Lee, and he can be found in the northern part of the area. Talk to Stan Lee to start the mission.
To summarize, to get Silver Surfer in LEGO Marvel Superheroes, you will need to complete his mission, called "The Good, the Bad, and the Hungry." This mission can be found in the "Exploratory Laboratory" area of the game, and can only be accessed after you have completed the story mode. Once you have completed the mission, you will unlock Silver Surfer as a playable character.
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A metal coin has certain properties that can be measured. Which property of a coin is different on the moon than it is on Earth?