It is an exothermic type of chemical reaction.
Yeast is an organism that contains a special chemical reaction known as catalase that could act as a catalyst to assist spoil down hydrogen peroxide. Catalase is found in nearly all residing matters which might be uncovered to oxygen, and it allows them to destroy obviously occurring hydrogen peroxide.
The response between the hydrogen peroxide and the yeast is called an exothermic response. you'll experience a warm temperature on the outside of the field due to the fact strength is being launched. The yeast enables to disposal of the oxygen from the hydrogen peroxide developing tons of tiny bubbles that made all that cool foam.
Elephant toothpaste is a foamy substance resulting from the speedy decomposition of hydrogen peroxide (H 2O 2) with the use of potassium iodide (IK) or yeast and warm water as a catalyst.
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Why do Alkaline batteries eventually stop working & why cant they be recharged?
Answer:
Alkaline do not conduct electricity so they can't be recharged
Explanation:
base don't conduct electricity
electron configurations are a shorthand form of an orbital diagram, describing which orbitals are occupied for a given element. for example, 1s22s22p1 is the electron configuration of boron. enter the complete electron configuration for arsenic ( as ).
1s^22s^22p^63s^23p^64s^23d^104p^3 is correct answer.
What is electron configuration ?
Electron configuration refers to the distribution of electrons in atoms and molecules.
Electron configuration can be defined as the specific arrangement of negatively charged electrons in different energy levels around atomic nuclei.
Electron configuration can also be used to represent the bonds that connect different atoms in a molecule.
Moreover, an electron orbital refers to the function that describes the location and behavior of electrons in a given atom.
In conclusion, electron configuration refers to the distribution of electrons in atoms and molecules.
The atomic number of arsenic is 33.
Write the electronic configuration as follows:
1s^22s^22p^63s^23p^64s^23d^104p^3
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A mixture of lemon juice, bromothymol blue indicator, and indigo carmine indicator is prepared . What is the colur of this mixture?
A.yellow
B.blue
C.colourless
D.green
1.) what is the name of NaF formula
Answer:
[tex]\text{Sodium Fluoride}[/tex]
Explanation:
Here, we want to get the name for the given chemical formula
Looking at the formula, we look at the names of the element
The names are sodium and fluorine
We write the name of the metal element first, then the non-metal atom
Thus, we have it as
[tex]\text{Sodium Fluoride}[/tex]Why is the atomic radius trend related to the electronegativity trend?
Here is the Answer I Hope this Helps:-
The closer the electrons are to the nucleus, the more tightly they are bound, thus increasing the electronegativity of the atom.
PLEASE HELP PLEASE PLEASE
Solid Strontium hydroxide reacts with Acetic acid to form…?
Follow these steps:
a. Identify the type of reaction
b. Predict products for formula
c.balance the equation
Who first developed a mathematical expression to relate the visible wavelengths of light emitted by the hydrogen atom?.
Answer:
Niel Bohr in 1913.
Niel conducted experiments with Hydrogen atoms and tried to correlate their emission spectrum with the "atomic fingerprint" he would get for the atom.
Unfortunately, his calculations only worked on the Hydrogen atom.
**Bohr constructed the Bohr model, which is the structural model of an atom.
the half-life of radium-225 is 14.9 years. what is the annual decay rate? express the result to four decimal places.
The annual decay rate for the radium-225 having a half life of 14.9 years is 0.0465 year⁻¹
How do i determine the decay rate?We know that half life is the time taken for half of a substance to decay.
The half life of a substance is related to the decay rate according to the following formula:
Decay rate (λ) = 0.693 / Half life (t½)
λ = 0.693 / t½
With the above formula, we can obtain the decay rate as illustrated below:
Half-life radium-225 (t½) = 14.9 yearsDecay rate (λ) =?Decay rate (λ) = 0.693 / Half life (t½)
Decay rate (λ) = 0.693 / 14.9 years
Decay rate = 0.0465 year⁻¹
Thus, we can conclude that the decay rate is 0.0465 year⁻¹
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could anybody help me with #4? thank you!
Answer:
well a carbon dioxide mole is equal to 44.0095 and when you times that by 6 ( since theres 6 moles ), you get 264.057 ( rounded to 264), so i think B is right
Explanation:
( sorry if im wrong)
How much is one ounce of the element Radon (Rn) Please help!!!!!!!
The quantity of Radon (Rn) found in one ounce of the element = 28.35g
What is Radon (Rn)?Radon (Rn) is defined as the element found in the periodic table with the atomic number of 86 and molecular atomic mass of 222g.
The molar mass of the element Radon (Rn) = 222g.
But 1 ounce= 28.35 grams
X ounce = 222gramms
Make X the subject of formula;
X ounce = 222/28.35
= 7.8 ounce.
That is to say that, 7.8 ounce of Radon= 222g,
28.35 grams of Radon = 1 ounce.
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Explain why the sulfide ion (S²⁻) is larger than the chloride ion (Cl⁻).
Optional question (if you know the answer): Which atom/ion has the larger ionic size Li or Li₊
The sulfide ion (S²⁻) is larger than the chloride ion (Cl⁻).
According to the question , sulfide ion (S²⁻) is larger than the chloride ion (Cl⁻) . the atomic number of sulfur 16 and chlorine is 17
sulfur .
atomic number of sulfur is 16,
now, S²⁻ = 18 electrons
Cl⁻ = 18 electrons
The no. of electrons in S²⁻ and Cl⁻ are same 18 electrons. But S²⁻ ion has one proton less than Cl⁻ ion. So, the attractive force between the nucleus and electron is more that's the reason Cl⁻ ion is smaller than S²⁻
Thus , the sulfide ion (S²⁻) is larger than the chloride ion (Cl⁻).
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The difference between Ionic bond and Covalent bond.
The difference between an ionic bond and a covalent bond is that ionic bod are made regardless if atoms are metal or nonmetal, while covalent bonds always are generated between non-metals atoms.
What is a covalent bond?A covalent bond is a chemical bond between two atoms that are non-metals such as between hydrogen and oxygen atoms, while ionic bonds involve metals and non-metal atoms one example of this type of bond is the NaCl sodium chloride.
Therefore, with this information, we can conclude that ionic and covalent bonds are distinct due to the atoms that form the chemical bond.
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What is the ratio of argon-40 to potassium-40 two half-lives
after the rock has formed?
The ratio of argon-40 to potassium-40 two half-lives after the rock has formed is 7:1.
The half-life of a radioactive compound tells us the time needed for half of the atoms of any compound to go through the radioactive decay.
We know that, half-life of potassium-40 is 1.25 billion years because this is how long it takes for half of the number of atoms which are present in the sample to decay to argon-40.
The half-life of potassium-40 which decays by the beta emission is 1.28 × 10⁹ years. The half-life of potassium-40 which decays by the positron emission is 1.19 × 10¹⁰ years.
40 K which naturally occurs decays to the stable 40 Ar which is 11.2%, It happens by the capture of electron and by positron emission. It gets decayed to stable 40 Ca (88.8%) by emission of negatrons. Half-life of 40 K 1.25 x 10⁹ years.
The dating method of potassium-argon is specifically useful in determining the Lava age.
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Dropbox Assignment
A Hidden Champion
Hidden champion is a term that was coined by a German business consultant, Hermann Simon. A hidden champion is a small to medium-sized company that is narrowly focused on a small, highly specialized market. Such companies are usually not well known yet are very profitable. One example of a hidden champion is the French company Essilor.
Staying the Course
Essilor manufactures ophthalmic lenses, which is the formal name for contact lenses and lenses for eyeglasses. Over the years, Essilor has reinforced its single focus and avoided branching out into eyeglass retailing. Instead, the company concentrated its effort on going global. Today, Essilor is the industry's leader. Besides staying specialized and having a clear strategy, Essilor kept innovations coming. For example, Essilor invented progressive lenses. These alternatives to bifocal lenses have a gradual change in correction power from top to bottom. Like most other hidden champions, Essilor invests a notable four to five percent of its annual sales on research and development. Other characteristics of hidden champions include tight financial management, superior customer service, and foresight.
How would you evaluate this hidden champion based on the 4 functions of business we learned in this lesson? Submit your complete evaluation to the dropbox titled: Business Opportunities
Nearly thirty years ago, Professor Hermann Simon was the first to introduce the term "hidden champions."
What unheralded German heroes exist today?A strange event in Germany. Privately held businesses known as "hidden champions" have excelled to amazing degrees of success while maintaining a very low profile in society, sometimes not even in Germany.
Many extremely successful businesses go unrecognized by individuals in the media, in research, or in the improvement industries, according to Professor Hermann Simon, who first used the term "hidden champions" about thirty years ago (consultants).
How many so-called "hidden champions" exist in the world?the psychological dimensions of monetary success and the effects of capitalism on society. Germany is home to over half of the 2,700 very profitable businesses dubbed "hidden champions."
The great majority of people have never heard of them, in contrast to large companies that are listed on public markets.
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Most air-conditioned
rooms are set to a temperature of about 22°C.
Human body temperature is 37°C. Why don't
people in an air-conditioned room come to
thermal equilibrium with the room?
Just its "target temperature," not the temperature of the wind it blew, is what you select as the "air conditioning temperature."
When the air conditioner is set to "23°C cooling," it will blast air that is cooler than 23°C.
(For instance, no matter what temperature you set your air conditioner to, whether it is 18°C or 28°C, it must always be 13°C when cooling.) Until the temperature control determines that the current temperature is below 23°C, it won't stop operating.
When the setting is set to "23°C heating," however, the air conditioner will blow a 40°C hot breeze until the temperature control detects a temperature of 23°C, at which point it will shut off.
What you choose as the "air conditioning temperature" is just its "target temperature," not the temperature of the wind it blew.
The air conditioner will blow air that is colder than 23°C when it is set to "23°C cooling."
(For instance, your air conditioner must always be set to 13°C when cooling, regardless of whether the temperature is 18°C or 28°C.) The temperature control won't turn off unless it determines that the ambient temperature is below 23°C.
However, when the temperature control is set to "23°C heating," the air conditioner will produce a 40°C hot breeze until it registers 23°C, at which time it will turn off.
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a(n) is a list collection has elements that are ordered by a characteristic of the elements.
A ordered list is a list collection has elements that are ordered by a characteristic of the elements.
What is an element ?A material that cannot be converted into some other substance is known as an element. Each of the 120 elements has a unique form of atom. Atoms from at minimum one or more elements is present in everything in the cosmos. All known elements are listed in the periodic table, with those that have related properties being grouped together.
What materials make up elements?Particles are the basic building block of all elements. Protons, neutrons, and electron make up atoms. A mixture can be created by combining two different types of elements. The molecule is indeed a group of atoms that can't be separated from the bigger substance it is a component of while still keeping its characteristics.
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pls help with this ill give you 50 pts
How do you obtain the absorbance value at a selected wavelength for the absorbance spectra of each of the solutions that you prepare?.
The absorbance value at a selected wavelength for the absorbance spectra of each of the solutions can be determined by using Beer's law.
What is Beer's law?
According to Beer's rule, the absorbance is inversely proportional to the concentration of the absorbing substance at constant route length. When an is a constant that depends on the medium, the absorbing substance, and the light's wavelength, and b is the path length, C is the concentration (solvent and other components).
The absorbance value for each spectrum is calculated at a certain wavelength. In general, it is desirable to choose a wavelength where the absorbance is at its highest because this will reduce the measurement's relative inaccuracy. The next step is to create a Beer's Law plot showing absorbance vs. concentration.
Hence using the Beer's law we can easily calculate the absorbance value at a selected wavelength for the absorbance spectra of each of the solutions that we prepare.
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7. Complete the concept map below.
Water Drainage
may result In
A.
Volcanic Eruption
may affect
Solar Activity
may result in
B.
Blosphere
may result in
C.
Drainage that is not handled properly can cause an increase in erosion, changes in stormwater runoff, flooding, and damage to water quality.
Natural Disaster?Large-scale geological or meteorological phenomena that have the potential to cause loss of life or property are considered natural disasters. Tornadoes and severe storms are examples of these catastrophes. Tropical Storms and Hurricanes. Floods.They release significant amounts of gas and dust into the atmosphere, particularly the upper atmosphere, which temporarily alters the climate on Earth.Large volcanic eruptions should be followed by a drop in the average surface temperature, which is actually seen and lasts for typically 1 to 3 years. Deforestation and the combustion of fossil fuels have detrimental environmental effects that directly affect the biosphere. Pollutant emissions and carbon dioxide have a negative impact on all types of life.To learn more about Natural Disaster refer to:
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Compare the codes listed at the top of each drawing in Model 1 with the shapes in that box.
What do the letters R, Sq, and T in the codes represent?
What do the small numbers (subscripts) in the codes represent?
When atoms are touching, how is that communicated in the code?
What is the common characteristic of the samples in which an ampersand (&) is used?
In Model 1 there are three drawings that are labeled with a question mark. Write codes
properly label these drawings.
POGILT Activities for High School Ch-
a) R = square; Sq = round. Triangle = T. b) The little numbers (subscripts) in the codes indicate how many of a certain sort of atom there are in a given molecule.
What do the letters R sq and T in the codes stand for?Compare the forms in that box with the codes stated at the top of each design in Model 1. molecule.
a) What do the codes' letters R, Sq, and T stand for? R=Round. Sq Square T=triangle (atoms) (atoms).
b) The small numbers (subscripts) in the codes indicate how many atoms of a certain kind are present in molecule.
What is an element's one- or two-letter code?A one- or two-letter identifier of an element is known as a chemical symbol. The chemical symbols O for oxygen, Zn for zinc, and Fe for iron are a few examples.
A symbol's first letter is usually capitalized. The second letter of a symbol that has two letters is lowercase.
b) In the illustrations of Model 1, what does it signify when two atoms or molecules are not in contact? In the sample, the atoms or molecules are not bound to one another; instead, they are merely positioned near to one another.
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If an Oreo cookie is 0.69 cm thick (1 cookie = 0.69 cm), how many Oreos does it take to reach the moon if the moon is 3.84 x 10^8 m away from earth?
Answer:
66vhiib
Explanation:
Which statement best describes the effect of low ionization energies and low electronegativities on metallic bonding?
The statement best describes the effect of low ionization energies and low electronegativities on metallic bonding is : Delocalization of the valence electrons is simple.
What is ionization energy ?
Ionization energy, also known as ionization potential, is the amount of energy needed to remove an electron from an isolated atom or molecule in physics and chemistry.
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gas sample is made entirely of carbon dioxide and water, and there are 259 moles of co2 and 513 moles of water. if the total pressure of the sample is 21 atm, what is the partial pressure of each gas?
Partial pressure of CO2 , p'=7.0455 atm and Partial pressure of water p ''=13.9545 atm
No. of moles of CO2 , n' = 259 moles
No. of moles of water , n'' = 513 moles
Total no. of moles , n = 513+259
= 772 moles
Mole fraction of CO2 , X' = n' / n
= 0.3355
Mole fraction of water , X'' = n'' / n
= 0.6645
Partial pressure of CO2 , p' = X' * total pressure
= 0.3355 * 21
= 7.0455 atm
Partial pressure of water , p '' = X'' * total pressure
= 0.6645 * 21
= 13.9545 atm
The force perpendicularly applied to an object's surface divided by the area over which it is dispersed is known as pressure. The pressure as compared to the surrounding air pressure is known as gauge pressure. To express pressure, a variety of units are employed. The tension or pressure that is applied uniformly across a confined fluid is known as hydrostatic pressure (liquid or gas). In a fluid at rest, there is no other tension conceivable. Look at the Pascal's principle. In the Earth's crust, there is a pressure called lithostatic pressure that is similar to hydrostatic pressure in fluids. It is the stress that surrounding rocks place on a body of rock.
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6.25 moles of magnesium to grams
1) Substance: Magnesium.
[tex]Mg[/tex]2) Convert moles of magnesium to grams of magnesium.
The molar mass of magnesium is 24.3050 g/mol.
[tex]g\text{ }Mg=6.25\text{ }mol\text{ }Mg\ast\frac{24.3050\text{ }g\text{ }Mg}{1\text{ }mol\text{ }Mg}=151.91\text{ }g\text{ }Mg[/tex]6.25 mol Mg is equal to 151.91 g Mg.
.
Consider an atom whose nucleus contains 30 neutrons and has a charge equal to +4 x 10 ¹8 C. -18 a) Calculate the atomic number and the mass number of this atom. b) How many electrons does this atom have?
Atomic Number = 30
Mass Number = 30 + 30 = 60
The atomic number, sometimes referred to as nuclear charge number, of a chemical element is the charge number of an atomic nucleus. This is the number of protons present in the nucleus of each atom of that element, or the proton number, for conventional nuclei. The atomic number of common chemical elements can be used to uniquely identify certain elements.
The number of neutrons and protons in an element determines its mass number: Protons and neutrons together make up mass. Simply deduct the number of protons, or atomic number, from the mass number to get how many neutrons an atom has.
The neutron, symbol n or n0, is a subatomic particle with a neutral charge and slightly more mass than a proton. Protons and neutrons make up an atom's nucleus.
The electron is a subatomic particle with a negative one elementary charge electric charge. The first generation lepton particle, the electron, is usually regarded as an elementary particle because it has no components or substructure.
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HELP ME PLEASE!! ASAP!!
Which of these pairs of elements is most likely to be part of a polyatomic ion?
Ba and O (Barium and Oxygen)
C and N (Carbon and Nitrogen)
K and Br (Potassium and Bromine)
Rb and Cl (Rubidium and Chlorine)
Answer:
Option B) Ba and O (Barium and Oxygen)
Explanation:
Barium and oxygen elements are the pairs which are most likely to be the part of polyatomic ion. As barium has +2 charge and Oxygen has -2 charge which will be settle once they form an polyatomic ion.
Sodium-22 undergoes positron emission as shown:
AiNa - ANe + 93
If this decay has a half-life of 2.60 years, what mass of 72.5 g
sodium-22 will remain after 15.6 years?
q
A nucleus can split into two or more particles due to the instability of the nucleus.
Radioactive elements usually have unstable nuclei.
General decay formula:
[tex]N_{t} = N_{0} (1/2)^{t}/t^{1/2}[/tex]
T = duration of decay
t 1/2 = half-life
N₀ = number of initial radioactive atoms
Nt = number of radioactive atoms remaining after decay T - h
half-life = t 1/2 = 2.6 years
T = 15.6 years
No = 72.5 g
Nt = 72.5.[tex]1/2^{15.6/2.6}[/tex]
Nt = 72.5.[tex]1/2^{6}[/tex]
Nt = 1.13g
Na22 is produced by cosmic rays that induce the fragmentation of atmospheric argon. However, measurements have shown that Na22 is also produced during nuclear weapons testing. His Na22 fallout observed at Heidelberg was about 20 times higher than natural production in 1963 and about 11 times higher in 1964. Sodium 22 is an artificial isotope with a half-life of 2.6 years. It emits a positron and decays into the stable Neon 22 β+ decay. A small fraction of the attenuation of 0.06% leads directly to the neon ground state.
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Which of the following is a hydrocarbon ?
a. Urea
b. Benzene
c. Ammonium cyanate
d. Phenol
Benzene is a hydrocarbon because it is made up of only carbon and hydrogen atoms. The molecular formula of Benzene is C6H6.
Hydrocarbons are those compounds that are made up of two kinds of atoms; carbon and hydrogen. Their general chemical formula is CxHy. Hydrocarbons are then further divided into different types like saturated and unsaturated hydrocarbons, aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, etc.
Benzene is an aromatic hydrocarbon because it is made up of only carbon and hydrogen atoms that are joined together to form a ring shape.
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2) How many cm are there in 4.5 feet?
Know:
feet
4.5 feet
1
X
X
Goal:
? Centimeters
=137.16 =137.161
cm
Answer:
Just add times one
Explanation:
There are 30.48 cm in one foot so if you time 30.48 x 4.5 you should get your answer
_____ is the total amount of potential and kinetic energy of an object.
The state of matter
Temperature
Thermal energy
Potential energy
Answer:
thermal energy.
Explanation:
endothermic energy consists of the potential and kinetic energy in an object.
Answer:
it's correct answer is mechanical energy.Explanation:
but there is no option of mechanical energy
