What is the speed of an object that travels 20 meters in 5
Answer:
5 what
Explanation:
not enough information
hii thank you for helping me for that question please give me now this question define the air polution
Answer:
A mixture of solid particles and gases in the air.
Explanation:
Air pollution is a mixture of solid particles and gases in the air. car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities. When ozone forms air pollution, it's also called smog.
Air pollution can be defined as the presence of toxic chemicals or compounds (including those of biological origin) in the air, at levels that pose a health risk. In an even broader sense, air pollution means the presence of chemicals or compounds in the air which are usually not present and which lower the quality of the air or cause detrimental changes to the quality of life (such as the damaging of the ozone layer or causing global warming).
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aluminum has a density of 2.70 g/cm^3, a sample with a volume of 50 cm^3 will have how much mass?
Answer:
135 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question
density = 2.70 g/cm³
volume = 50 cm³
We have
mass = 2.70 × 50 = 135
We have the final answer as
135 gHope this helps you
what kind of reaction is happening when glaze is fired
Answer:
Oxidation and Reduction occurs
Explanation:
Explain why graphite conducts electricity.
Answer in terms of the structure and bonding in graphite.
Answer:
Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. A lot of energy is needed to separate the atoms in diamond. This is because covalent bonds are strong, and diamond contains very many covalent bonds.
Graphite on the other hand has flat layers of carbon atoms held by weak van der Waal's forces which makes Graphite a weak object and easily breakable.
As graphite contains layers of carbon atoms. The layers slide over each other easily because there are only weak forces between them, making graphite slippery. These electrons can move through the graphite, carrying charge from place to place and allowing graphite to conduct electricity.One valence electron of each carbon atom remains free, Thus making graphite a good conductor of electricity. Whereas in diamond, they have no free mobile electron. Hence there won't be flow of electrons That is the reason behind diamond are bad conductor electricity.These electrons are free to move between the layers in graphite, so graphite can conduct electricity.The forces between the layers in graphite are weak. This means that the layers can slide over each other.
Regular table salt is sodium chloride, NaCl. It is a bonding of an Na+ ion and a Cl- ion. Which of these ions is bigger?
Answer:
in the periodic table we can see that the ions of Cl is greater than the ions in Na
Cl- ion is bigger than Na+ ion because of the presence of more number of electrons.
The atomic number of sodium+ ion is 10 means it has 10 number of electrons which can accommodate into 2 shells or orbits while on the hand, chlorine- ion has atomic number 18 means it has 18 number of electrons which can be accommodate into 3 shells or orbit.
So there is one shell more in chlorine ion as compared to sodium ion which make the size of chlorine ion large so we can conclude that chlorine ion is bigger than sodium ion.
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what minimum frequency of light is required to ionize boron?
Answer:
frequency = 8.22 x 10¹⁴ s⁻¹
Explanation:
An electron's positional potential energy while in a given principle quantum energy level is given by Eₙ = - A/n² and A = constant = 2.18 x 10⁻¹⁸j. So to remove an electron from the valence level of Boron (₅B), energy need be added to promote the electron from n = 2 to n = ∞. That is, ΔE(ionization) = E(n=∞) - E(n=2) = (-A/(∞)²) - (-A/(2)²) = [2.18 x 10⁻¹⁸j/4] joules = 5.45 x 10⁻¹⁹ joules.
The frequency (f) of the wave ionization energy can then be determined from the expression ΔE(izn) = h·f; h = Planck's Constant = 6.63 x 10⁻³⁴j·s. That is:
ΔE(izn) = h·f => f = ΔE(izn)/h = 5.45 x 10⁻¹⁹ j/6.63 x 10⁻³⁴ j·s = 8.22 x 10¹⁴ s⁻¹
what is the pattern of liquids and solids from the center of the earth out
Explanation:
I'm sorry if this doesn't answer this correctly but solid liquid solider solid liquid/solid
Someone pls help me I will make you brain
Match them pls
Answer:
Explanation:
Carbon monoxide → Prevents oxygen from being transported in the body
Nitrogen oxides → Can cause asthma
Particulate matter → Irritates lungs, dizziness, seizures, or death
Sulfur oxides → Inflammation and irritation of the respiratory system
I hope this helps!
solutions of barium bromide and sodium phosphate combine to form solid barium phosphate and aqueous sodium bromide. true or false?
Answer:
The Answer Is False
Explanation:
I Just Think Thats The Answer
Someone pls help me I will make you brain
Answer:
Its the first one
Explanation:
I learned this before
Please I will mark brainliest !!! I need both answered
d. Period 3 element with 6 valence electrons
Answer:
Sulfur is an element is Period 3 with 6 valence electrons.
What is the formula for Water?
Name full name element's name
Answer:
2 Hydrogen atoms and 1 Oxygen atoms makes water
Explanation:
Hope this helps^^
Answer: Its chemical formula H2O, indicates that each of its molecules contains one oxygen and two hydrogen atoms,
Explanation: i hopes it helps :)
Which elements are present in all organic compounds? 1. Hydrogen and oxygen 2. Nitrogen and Carbon 3. Nitrogen and oxygen 4. Hydrogen and Carbon
Answer:
my answer is num:3 Hydrogen and oxygen.
in structural isomers atoms and functional groups join together in different ways. which of the following statements is not correct with respect to structural isomers
Structural isomerism is based on the existence of different molecular
structures formed by the same elements.
The statement that is not correct with respect to structural isomers is; All
structural isomers show hydrogen bonding.
Reason:
Structural isomers are isomers that have different molecular structures but
the same molecular formula. They are referred to as constitutional isomers
Therefore;
The empirical formula which is obtainable from the molecular formula is the same for structural isomers.The structural formula of structural isomers are differentStructural isomers that are functional isomers have different chemical properties.However;
Structural isomers that are linkage isomers may not have hydrogen bonding.Therefore, the statement that is not correct with respect to structural isomers is; All structural isomers show hydrogen bonding.
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The question options are;
The same empirical formula among structural isomers.
Different physical and chemical properties can be possessed by structural isomers.
Structural isomers have different structural formulas.
Hydrogen bonding is shown in all structural isomers.
All the above statements are correct.
An atom of radium (Ra) forms a monatomic ion.
Which ion does it most likely form?
a- Ra2-
b- Ra-
c- Ra2+
d- Ra+
Answer:
The atomic number of the element Radium (Ra) is 88. It is an alkaline earth metal. Electronic configuration of Radium (Ra) will be [Rn]7s^{2}[Rn]7s
2
It belongs to the group IIA of the periodic table. Alkaline earth metals that belong to the group IIA of the periodic table lose the valence electrons to form a +2 ion.
Therefore, Radium with an electronic configuration of [Rn]7s^{2}[Rn]7s
2
will lose the two 7s electrons to form the cation with +2 charge.
Someone please help :/
I'm writing a lab report for my chem class on crystalline structures and I have absolutely no idea how to write the introduction. Can someone please direct me on how exactly I should write this?
Thanks!
Answer:
yes i will help
txt me. down and show what is the. project
Draw the reaction of bromoethyne with 2 molecules of HBr. Name the product(s) and the type of reaction.
PLEASE HELP!!
this maybe can help you
i am sorry if not
Bromo-ethene is a product and it is a electrophilic addition reaction.
What is chemical equation?A chemical equation is a method of representing a symbols and formulas of substance involved in this equation.
For example: zinc metal reacts with dilute sulfuric acid to form zinc sulfate and hydrogen gas.
Types of chemical reactions:
combination reactions decomposition reaction precipitation reaction neutralization reactionElectrophilic addition reaction
In this reaction containing a double or triple bond and this one hour breakdown into 2 π and 2 Sigma bonds.
In this reaction HBr undergoes heterolytic bond fusion the protons bonds with the carbon atom of the Carbon triple bond this result in the formation of carbo cation immediate the bromide iron forms a bond with the carbon cation producing Bromo-Ethene.
CH ≡ CBr + 2HBr → Br-CH=CH₂ (Bromo-ethene)
In these reaction Bromo-ethyne react with hydrogen bromide it form Bromo-ethene.
Bromo-ethene is a product and it is a electrophilic addition reaction.
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Is it possible to have an electromagnetic wave with a wavelength (a) of 104.68 m and an energy of 3.25 x 10-27 J? Show your work.
2. You work for an environmental company as an environmental toxicologist and have been hired to determine the contaminant present in a local resident’s pool. Create a flow chart outlining how you would detect the possible presence of Fe2+ and/or Sr2+
How do animals and plants rely on each other in the prairie? ITS TIMED
There are many decomposers in the prairie that can be used as food sources for first-order consumers.
There is more sunlight in the prairie for plants to grow, and therefore more food sources for animals.
Second-order consumers eat the grass as their food source.
The grass in the prairie provides oxygen, while animals give off carbon dioxide gas.
Answer:
I would assume its the last one "The grass in the prairie provides oxygen, while animals give off carbon dioxide gas."
Explanation:
The question asks how the animals and plants rely on each other
The plants provide oxygen and food for the animals, and the animals provide carbon dioxide to them.
Hope this helps :D
What is 40g of calcium and 71 g of chlorine
why is it necessary to run tlc in a closed container?
Answer:
Explanation:
It is necessary to run TLC in a closed container and have the interior saturated with the solvent vapor to ensure maximum resolution between components and to prevent solvent evaporating off. If the solvent evaporates off, the Rf value would be lower than the expected value.
Based on electronegativity differences, which bond is a polar covalent bond?
Answer:
A bond in which the electronegativity difference between the atoms is between 0.4 and 1.7 is called a polar covalent bond.
A polar covalent bond is a covalent bond in which the atoms have an unequal attraction for electrons and so the sharing is unequal.
What are the atoms of Fe(SCN)3
Answer:
55.845
Explanation:
yep
why does the total volume of water and alcohol decrease when the liquids were mixed together?
Answer: I think the alcohol molecules slip between the water molecules and take up that space, so you have less that you started with.
Explanation:
how do lone pairs of electrons influence the structure of molecules?
Answer:
lone pairs and bonds both repulsive each other
Explanation:
therefore bond angles will be changed that leads to the original geometry in nature
Name the following ionic compounds that contain transition metals. Use the periodic table provided
and a chart that lists the possible charges of transition metals, found here.
Cuci
copper(1) chloride
O
copper chloride
copper(ll) chloride
DONE
The correct name of the compound CuCl is copper I chloride.
An ionic compound is formed two atoms when one loose electrons and the other atoms gains those electrons. Ionic bonds are actually an ion pair, a pair of oppositely charged ions held together by electrostatic interaction. Transition metals are elements with incompletely filled d orbitals. Copper is a transition element.
The compound CuCl is named copper I chloride. We can see that the copper is in the +1 oxidation state in this compound hence the name.
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Answer:
copper(I) chloride
Explanation:
Edge 2021
Hoàn thành phương trình sau. Và ghi rõ phản ứng ion: NaHCO33 + NaOH->
Answer:
hello
Explanation:
hello
Someone pls help me I will make you brain
Answer:
i cant read it but its c and a
Explanation:
my thinking faces