Chromium exhibits a wide range of possible oxidation states, where the +3 state is the most stable energetically. The +3 and +6 states are the most commonly observed in chromium compounds, whereas the +1, +4 and +5 states are rare.
Nh3 metabolism - Urea cycle
Answer:
Ammonia is a toxic product of nitrogen metabolism which should be removed from our body.
The urea cycle or ornithine cycle converts excess ammonia into urea in the mitochondria of liver cells.
The urea forms, then enters the blood stream, is filtered by the kidneys and is ultimately excreted in the urine.
The word "atom" means:
-the smallest imaginable thing
-that which cannot be cut
-everything that is not vacuum
-that which cannot be seen
Answer:
atoms as a source of nuclear energy.
noun: the atom
"the power of the atom
that which cannot be cut or indivisible
3 Physical properties of boron?
Answer:
Atomic Symbol: B
Atomic Number: 5
Element Category: Metalloid
Explanation:
0.1 points
Which orbital-filling diagram represents the ground state of oxygen?
O [He]
11
2s
2p
1
[He]
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2p
2
2s
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O
[He]
11 111
2p
3
2s
O
[He] ]
们
2s
N
4
2p
5
Previous
Answer:
Abe chutiye, Question sahi se likh laude phle
What is the difference between the mass number and the atomic mass? Why is the
mass number a good approximation for atomic mass
Answer:
The mass number is the sum of the number of protons and neutrons in an atom. It is a whole number. The atomic mass is the average number of protons and neutrons for all natural isotopes of an element
An element's mass number (A) is the sum of the number of protons and the number of neutrons. ... This approximation of mass can be used to easily calculate how many neutrons an element has by simply subtracting the number of protons from the mass number. Protons and neutrons both weigh about one atomic mass unit or amu
What is a periodic table ?
Answer:
The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson.
Answer:
A periodic table is a table filled with chemical elements. They are organised by their atomic number and how many electrons each element contains
Ethan makes the table below to record his observations when mixing baking soda and vinegar in a beaker. Ethan claims that a chemical change has occurred. Which statement provides the BEST evidence to support his claim?
Answer: a
Explanation:
Many bubbles formed after mixing.
The statement which best provides support for the fact that a chemical change has occurred is that many bubbles formed after mixing.
In a chemical change, new substances are formed and there is a recombination of the atoms in reactants as the products are being formed.
There are several cues that indicate that a chemical change has taken place such as;
Appearance of a solid in an aqueous phase reaction.Evolution of gasSudden change in the temperature of the systemChange in the color of the systemIn the particular instance in this question, when baking soda and vinegar were mixed together, a gas was evolved signifying that a chemical change has taken place.
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Balance the following chemical equation and determine the number of moles of Fe(s) produced when 8.1E-1
moles of Fe2O3(s) react with excess C(s) to produce Fe(s) and CO2(g).
Fe2O3(s) + C(s) ——)Fe(s) + CO2(g)
Answer:
2Fe2O3 + 3C → 4Fe + 3CO2
Explanation:
The balanced reaction of Ferric oxide with carbon to form Iron and Carbon dioxide can be written as follows:
[tex]2Fe_{2} O_{3} +3C\rightarrow4Fe+3CO_{2}[/tex]
The moles of iron produced is[tex]16.2*10^{-1}[/tex]
What is balanced equation?Balanced equation is the one where the number of atoms of each species is same on reactant and product side. In balanced equation mass can neither be created nor be destroyed.
The atoms of Oxygen on reactant side is 3 while on product side is 2 so multiply Ferric oxide by 3 and carbon dioxide by 3
so now our equation becomes
[tex]2Fe_{2} O_{3} +C\rightarrow Fe+3CO_{2}[/tex]
The number of Carbon atoms on left side is one while on right side it is 3 so multiply by 3
[tex]2Fe_{2} O_{3} +3C\rightarrow Fe+3CO_{2}[/tex]
The number of Iron atoms on left is 4 while on right it is 1 so multiply by 4
[tex]2Fe_{2} O_{3} +3C\rightarrow4Fe+3CO_{2}[/tex]
From 2 moles of Ferric oxide 4 moles of iron is produced
from 1 mole mole of ferric oxide 2 moles of Iron is produced
From [tex]8.1*10^{-1}[/tex] mole of ferric oxide 2×[tex]8.1*10^{-1}[/tex] moles of iron are produced.
Hence the balanced equation is
[tex]2Fe_{2} O_{3} +3C\rightarrow4Fe+3CO_{2}[/tex]
the number of mole of Iron is [tex]16.2*10^{-1}[/tex]
Learn more about the balanced equations, here:
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#SPJ2
Vitamin D is produced in the skin when 7-dehydrocholesterol reacts with UVB rays (ultraviolet B) having wavelengths between
270 nm and 300 nm. What is the energy range of the UVB photons?
UVB photons, with wavelengths between 270 nm and 300 nm, have energies in the range of 6.63 × 10⁻¹⁹ J - 7.37 × 10⁻¹⁹ J.
UVB rays have wavelengths (λ) between 270 nm and 300 nm. We can calculate the energy (E) associated with each wavelength using the Planck-Einstein's relation.
[tex]E = \frac{h \times c}{\lambda }[/tex]
where,
h: Planck's constant (6.63 × 10⁻³⁴ J.s)c: speed of light (3.00 × 10⁸ m/s)The energy associated with a wavelength of 270 nm is:
[tex]E = \frac{h \times c}{\lambda } = \frac{(6.63 \times 10^{-34}J.s ) \times (3.00 \times10^{8}m/s )}{270 \times 10^{-9}m } = 7.37 \times 10^{-19} J[/tex]
The energy associated with a wavelength of 300 nm is:
[tex]E = \frac{h \times c}{\lambda } = \frac{(6.63 \times 10^{-34}J.s ) \times (3.00 \times10^{8}m/s )}{300 \times 10^{-9}m } = 6.63 \times 10^{-19} J[/tex]
UVB photons, with wavelengths between 270 nm and 300 nm, have energies in the range of 6.63 × 10⁻¹⁹ J - 7.37 × 10⁻¹⁹ J.
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1. Write the name for the following:
a. Phosphoric acid
b. Hydroiodic acid Nitrous acid
d . Hypochlorous acid
Use the equation to answer the question.
Which type of radioactive decay does the equation model?
beta-minus decay
gamma decay
beta-plus decay
alpha decay
Answer:
1. D
2. B
3. A
4. B
5. A
Explanation: just finished quick check
The equation is an example of beta-minus decay.
In a beta-minus decay, an electron is converted to a proton. When this happens, the atomic number of the daughter nucleus increases by one unit above the atomic number of the parent nucleus.
Looking at the equation, we can see that the atomic number of the daughter nucleus increased by one unit above that of the parent nucleus while the mass number of both the parent nucleus and daughter nucleus remained the same. Therefore, a beta-minus decay has taken place.
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List the three pieces of evidence for sea floor spreading that also support the theory of continental drift
Answer:
molten material, seafloor drilling, radiometric age dating and fossil ages, and the magnetic stripes
Explanation:
Which of the following helps us see atoms? (20 points including brainliest if correct)
A. Advanced telescopes
B. Our eyes
C. Large hand lenses
D. Powerful microscopes
Answer:
D.) powerful microscopes ....... telescopes are for space our eyes can't see atoms and hand lenses are not gonna do you any good
The negatively charged particle that is released from the nucleus at high speeds is the _____.
a. alpha particle
b. beta particle
c. neutron
d. gamma ray
Answer:
The negatively charged particle that is released from the nucleus at high speeds is the beta particle.
Every compound is a molecule, but every molecule is not a compound. Why is this? Give an example with your answer. Plz help mehhh TvT
Answer:
By definition, a molecule is a group of atoms bonded together. This means that it can be a mixture of two separate atoms (e.g. atom A and atom B bond together to make molecule AB). Molecules with two or more separate elements are called compounds.
Molecules can also be made of more than one atom of the same element (e.g. atom A bonds to another A atom to make molecule AA). This is not called a compound because they are not different elements.
The total pressure in a mixture of gases is equal to the partial pressure(s) of ________. the gas that occupies the largest volume the gas with the smallest number of moles all the gases added together the gas with the highest molecular weight the gas with the greatest number of moles
The total pressure in a mixture of gases is equal to the partial pressure of all the gases added together
According to Dalton's Law of Partial Pressure, The total pressure exerted by a mixture of gases which are non reacting is equal to the sum of the partial pressure of each individual gas that make up the mixture
Mathematically, Ut can be written as
P{total}= p1+p2, ....+ pn
where p1, p2, …, pn are partial pressures of each gas component.
For example :A gaseous mixture consisting of Helium and Nitrogen gas . If the pressure exerted by He is 3 atm while Nitrogeb exerted is 9 atm. The total pressure will be:
P{total}= p1+p2, ....+ pn
P{total}= 3+9
P{total}= 12
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Balance the following redox reaction by ion electron method.Cr2O72- + H2S → Cr3+ + S (in basic medium)
Answer:
gdfktfnfgh trhdfih tdjgd
state the name of the substance produced by a chemical reaction
Answer:
These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.
Explanation:
A prospector panning for gold (Au) in a river collects 15.00 g of pure gold. How many Au atoms are in this quantity of gold?
Answer:
There are 4.59*10^-24 atoms in 15.00 of pure gold.
Explanation:
Molar mass of gold is 196.996g/mol
[tex]\frac{15}{196.966} =0.076 mol[/tex]
0.076*(6.022*10^-23)=4.59*10^-24
What volume of 0.1000 Mstomach acid (HCl) could one tablet neutralize?
ml
Answer:
normal volume of the stomach fluid is 20 to 100 mL and the pH is acidic (1.5 to 3.5).
Explanation:
3.5 x 10^15 atoms of sodium to moles of sodium
Answer:
Explanation:
· 3.5 x 10^15 atoms of sodium to moles of sodium. Answers: 1 Show answers : ) Another question on Chemistry. Chemistry, 21.06.2019 22:30. Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u. Answers: 1. Answer. Chemistry,
Help pls 30 POINTS!!
Answer:
protons: 6
neutrons: 8
electrons:6
Perform the following calculation and report the answer with the correct number of significant figures.
81.72 +0.73 =
Answer:
81.72 +0.73=82.45
Explanation:
you need to add it1
81.72
+0.73
= 82.45
82.72 + 0.73 = 82.45
Explanation:
0.72+0.73 = 1.45
Therefore 81+1.45= 82.45 ( Integer in addition with a decimal number).
4. What is the energy of a photon that has a wavelength of 400 nm?
Answer:
4,9725*10⁻¹³[J].
Explanation:
all the details are in the attached picture, answer is marked with orange colour.
An adult human lungs can only hold a volume of up to 6.0 L of air when fully expanded. Suppose that at sea level where the pressure is 1.00 atm, a sky diver traps 3.0 L of air in her lungs and holds her breath before rapidly ascending to an altitude where the pressure drops to 0.46 atm. If she doesn't exhale, determine if her lungs will rupture at this high altitude, then complete the sentence:
Answer:why would i know
Explanation: sorry
Cereal is an example of what
mixture
Answer:
a heterogenous mixture
Explanation:
a heterogenous mixture is a mixture that you can see the different things in it. A homogenous mixture is when you cant see the objects in the mixture
Which of these determines whether a fertilized egg develops into a toad, a snake, or a lizard?
A
the sex of the egg
B.
the age of the egg
С
the size of the egg
D
the genes of the ogg
Answer:
D
the genes of the egg determine
When the metallic element sodium combines with the nonmetallic element bromine (Br2), is the product a solid, liquid, or gas at room temperature?
I will give brainliest if you can explain how one would know this information.
Answer: it is a solid at room temperature.
Explanation:
The ions of the two reactants are Na{+} and Br{-}, so the formula of the product is NaBr.
and when the NaCl is a solid a room temperature. and when NaBr has similar properties to NaCl, so NaBr is a solid at room temperature too.
so our chemical formula for the product is NaBr and It's a solid at room temperature.
How can i study smater
Answer:
study....................
Explanation:
1.Short sessions
2.Sleep well
3.Set goal
4Aim to learn as if you were to teach
A neutral atom of a astatine would have how many electrons 33,85,125,or 210