Answer:
Transition zone of the sun
Explanation:
Transition Region - The transition region is a very narrow (60 miles / 100 km) layer between the chromosphere and the corona where the temperature rises abruptly from about 8000 to about 500,000 K (14,000 to 900,000 degrees F, 7700 to 500,000 degrees C).
The oxidation number of oxygen is -2, and that of chlorine is -1. Use this information to match the names of the compounds to their chemical formulas. manganese(II) chloride manganese(IV) chloride manganese(II) oxide manganese(IV) oxide MnCl2 arrowRight MnO2 arrowRight
Answer : The correct formula of manganese(II) chloride and manganese(II) oxide is [tex]MnCl_2[/tex] and [tex]MnO[/tex] respectively.
Explanation :
As we know that the chemical formula is formed by the criss-cross method.
In criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions.
For formation of manganese(II) chloride, manganese will form having an oxidation state of +2 called as cation and anion is chloride with oxidation state of -1.Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral .
For formation of manganese(II) oxide, manganese will form having an oxidation state of +2 called as cation and anion is oxide with oxidation state of -2.Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral .
Hence, the correct formula of manganese(II) chloride and manganese(II) oxide is [tex]MnCl_2[/tex] and [tex]MnO[/tex] respectively.
The oxidation number of oxygen is -2, and that of chlorine is -1
The top guy is wrong↑
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A student is examining an object in science class. It is pale yellow,brittle solid, with no shine. The sample is most likely a—
Answer: non metal
Explanation:
Nonmetals are dull, possess high ionization energies and electronegatives and are typically poor electricity conductors as they're insulators.
Non metals are also brittle and possess low melting point. Therefore, with the explanation, the sample is most likely a non metal.
We are encouraged to follow the 3 W's --
--Wait 6 feet apart
--Wear a mask over your nose and mouth
--Wash your hands throughly.
Which of these 3 W's would you consider to be a rule you follow in every science lab?
In your answer:
1. State the W
2. Explain why you think this is important for Science Safety.
Answer: Wash your hand Througly
Explanation:The things you handle in a lab can be dangerous and seeing as though it is a common habit to touch your skin and your face the things handled can make you and others sick. Washing your hands after every science lab session is essential to lab and outside lab safety.
why do u think some consumers believe that labortory testing of a product serves as proof of quality?
Answer:
to show that the consumer can use it in a way that the lab cant. with the consumer seeing that the product they're purchasing is good quality can lead to a demand for the product!
Explanation:
Which is a better substitute for water, Li2O or H2S?
Answer:
h2s
Explanation:
The closest chemical analogue for water is hydrogen sulphide or H₂S. Because, both oxygen and sulfur are same group elements and shows similar properties.
What is H₂S?Hydrogen sulphide or H₂S is a covalent compound formed by the combination of two hydrogens and one sulphur atoms. In this compound, each hydrogen shares one electron to sulfur and sulfur shares its two valence electrons to each hydrogen.
Water is H₂O, which is formed by the strong hydrogen bonding between hydrogen and oxygen and it exists as liquid mostly. Most of the compounds can be dissolved in water.
Lithium oxide Li₂O is a covalent compound with partial ionic character and it does not exhibit any similarity with water in any case.
Bothe sulfur and oxygen are in 16th group. They are gases with high electronegativity. Hence, both H₂O, H₂S are polar compounds. Both sulfur and oxygen have affinity towards hydrogen. Both have similar shape and bond angle.
Moreover, H₂S can dissolve some minerals and acts as a good solvent like water.
Hence, the better substitute for water is H₂S.
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Which property is a chemical property of a substance?
color
melting point
reactivity
boiling point
Answer:
Reactivity! :)
Explanation:
I just took the test! "2.13 Physical and Chemical Changes"
Reactivity is the chemical property of the substance. Therefore, option (C) is correct.
What are the chemical properties?A chemical property can be described as the property that causes a change in the chemical structure of the substance. A chemical property of a substance can be seen in chemical change or reaction in the substance.
A chemical property represents the ability of a substance to combine with other substances or convert into a different product. The chemical composition is the identity of the substance and on changing it the substance turns into a different substance.
A chemical property gets determined when a change occurs in the chemical identity of the substance. The chemical properties such as toxicity, reactivity, enthalpy of formation, the heat of combustion, oxidation states, radioactivity, etc.
The color, melting point, and boiling point are the physical properties of a substance while reactivity is the chemical property.
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Calculate the density of the items below. (D = M/V)
1) M = 15g V = 5.0ml *
Answer:
The answer is 3.0 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 15 g
volume = 5 mL
We have
[tex]density = \frac{15}{5} \\ [/tex]
We have the final answer as
3.0 g/mLHope this helps you
in the modern periodic table elements are raised according to increasing
Answer:
in the modern periodic table elements are raised according to increasing atomic number
Explain why the name 1-propene is incorrect.what is the proper name for this molecule
Answer:
Explanation:
Explain why the name 1-propene is incorrect what is the proper name for this molecule
The name 1-propene is incorrect because;
It is not necessary to indicate the position of the double bond. Whichever way you decide to flip it, the double bond will always be at the first carbon.The proper name for this molecule is;
PropenePropene otherwise known as propylene is simply propane with a double bond at the first carbon.
When we get to the alkenes where the naming of organic compounds becomes more complex, the numbering system is used to indicate the position of the bonds.
With propene, there are three carbon atoms and the double bond will always appear in between two of the carbon atoms.
So, it is not important to use numbers to show that the carbon is at the first carbon. This becomes necessary from the next compound, butene, where there are more carbons.
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based on your observation, you can infer that thermal energy transfers to/from objects with higher temperatures to/from objects with lower temperatures
Answer:
1. from 2. to
Explanation:
Help me please !!!
Which of the following can be inferred from the diagram above that shows the dependence of potential Energy on the Internuclear distance between two atoms?
A)The atoms form a bond with a bond length of 25 pm
B)The atoms form a bond with a bond length of 75 pm
с)The net force between the atoms is attractive at 25 pm
D)The net force between the atoms is attractive at 75 pm
Answer:
Its B. The atoms form a bond with a bond lenth of 75 pm
Can someone help me asap... my science teacher assigned this puzzle for us for our 'Atoms Escape Room'
My teacher told me that I have to decode the message using the decoder on the first picture I have attached below.
I still don't get it .....
Please help me asap. thank you.
Answer:
neutrons in c,o,b,h
Explanation:
i think so
Answer:
6860
Explanation:
hii if you could help that would be great, if the answer is correct ill mark as brainliest :)))
Answer:
Reactants, Products is the answer i believe
Answer:
reactants, products
Explanation:
A chemical reaction is the process in which atoms present in the starting substances rearrange to give new chemical combinations present in the substances formed by the reaction. These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.
Which sentence describes a characteristic of matter
Answer: Matter takes up space and has mass
Explanation:
Literally the definition of mass
The atomic number equals:
O The number of protons and the number of neutrons.
O The number of protons and the number of electrons.
The number of electrons and the number of neutrons.
O The number of protons plus the number of neutrons.
Answer:
B- the number of protons and the number of electrons.
Explanation:
The atomic number equals the change on the nucleus. It therefore also equals the number of protons in the nucleus and also equals numerically the number of electrons in thw neutral atom. The atomic number has the symbol Z.
All matter has a distinct melting and boiling point that we can use to describe it. Look at these thermometers. They show the temperatures at which each type of matter change from solid to liquid to gas. Use these thermometers to answer the questions on this worksheet.Preview the document
Answer:
Química orgánica
Explanation:
Help
I don't understand
I think that is A and D ?
Help ASAP
Which one of these is an example of cell division at work?
A: A tree grows taller.
B: A plant dies.
C: A dog digests food.
D: A muscle contracts.
Answer: A tree grows taller.
Explanation: Cells divide for many reasons. They may divide for growth, death, or to replace something. The cells divide when growth is happening, to allow to produce more cells. For example: When a tree grows taller the cells divide so they can produce more cells. The places in trees where these cell divisions happen, are called “Meristems”. This is where all the activity happens.
please let me know if this helps! have a great day!
Which of the following can cause the substance to change phase? Select all that apply.
change in temperature
change of shape
change in mass
change in pressure
Answer:
a and d
Explanation:
what does science explain? (4 points)
A) moral values
B) biased opinion
C) meaning of life
D) natural phenomena
Answer:
D
Explanation:
Kwkekkfkekwknmxmdlwlmcfmkee
Help with science pleaseee
Answer:
thermal energy
Explanation:
the sun used thermal energy to melt the icecream
A flask contains the liquids trichloromethane (chloroform) and water. They are separated using a separating funnel, which conclusion can be made from this observation alone?
A. Trichloromethane and water have different relative molecular masses
B. Trichloromethane and water have different boiling points
C. Trichloromethane has a higher density than water
D. Trichloromethane is more volatile than water
E. Trichloromethane and water do not mix
Answer:
A
Explanation:
Based on the observation that trichloromethane (chloroform) and water can be separated using a separating funnel, the conclusion that can be made from this observation alone is:
E. Trichloromethane and water do not mix.
When two substances are immiscible, such as trichloromethane (chloroform) and water, it means that they do not dissolve or form a homogeneous mixture when combined. Instead, they form separate layers within the mixture.
The immiscibility between trichloromethane and water is primarily due to their different polarities and intermolecular forces. Trichloromethane is a nonpolar compound with relatively weak intermolecular forces, while water is a highly polar compound with strong intermolecular forces.
Water is a polar molecule due to its bent shape and the presence of electronegative oxygen atoms that create partial positive and negative charges. Trichloromethane, on the other hand, is a symmetrical molecule with four chlorine atoms surrounding a central carbon atom, resulting in a nonpolar distribution of charge.
The fact that these two substances can be separated using a separating funnel indicates that they are immiscible, meaning they do not mix or dissolve in each other to form a homogeneous solution. Trichloromethane and water have different polarities and intermolecular forces, causing them to form separate layers in the separating funnel.
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Question 1
Put these elements in order of the INCREASING the atomic radius.
Li, O, C, F
A)O, C, F, Li
B) Li, C, OF
C) F, O, C, Li
D) C, F, Li, o
Explanation:
we know that,
From Left to right (Period) atomic radius decreases
and
From Top to bottom (Group) atomic radius increases.
Li, C, O, F belongs to same period.
So,
Atomic radius decreases if we go left to right
Increasing order of Atomic radius -
Li > C > O > F
Therefore,
Option C is correct ✔.
Answer: C
Explanation:
The leaf layer containing most of the chloroplasts is the:
O spongy layer
Owaxy layer
O palisade layer
cortex layer
I NEED HELLPPPPP PLEASEE I WILL GIVE BRAINLYYY
Answer:
O spongy layer is the right answer
Why is it beneficial for chemists to understand as many periodic trends as they can?
Answer:
It can help identify elements quicker.
Explanation:
The molecular mass of CO2 is 44.01 u. What is the mass of 2.0 mol of CO2?
Answer:
The mass of 2.0 mol of C02 is 44 grams
Explanation:
The weight of CO2 is 44 grams per mole (1 x 12 grams/mole for the carbon and 2 x 16 grams/mole for the oxygen atoms)
According to the mole concept, the mass of 2.0 mole of carbon dioxide is 88.02 u.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons.Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
Mass can be calculated by the number of moles formula as,
mass=number of moles×molar mass
=2×44.01=88.02 u.
Thus, the mass of 2.0 mole of carbon dioxide is 88.02 u.
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33) How many significant figures does the number 40230 have? *
Answer:
5
Explanation:
they are all significant All non-zero numbers ARE significant
which following is found in the nucleus of the atom
Answer:
Protons and neutrons are found in the nucleus of an atom. They make up a majority of the mass of an atom. In fact, the mass number of an element is the sum of its protons and neutrons. Since protons have a positive charge and neutrons are neutral, the nucleus of an atom is electrically positive.
Explanation:
Which of the following is not a genetic trait?
Dimples
Hair length
Height
Hair Color
Answer:
I honestly think is hair length
Which rule or principle does this violate?
A. Aufbau Principle
B. Pauli Exclusion Principle
C. Hunds rule
Answer:
Hunds rule is violated here.
Hunds rule : pairing of electrons takes place only if all the orbitals are filled with single electrons each.
