Answer:
Explanation:
It's radio waves because the higher the frequency, the shorter the wavelength. From crest to crest, the wavelength of a radio wave is the shortest. The longest would be ultraviolet light, then visible light, then microwaves! And since radio waves have the highest frequency out of any of them, it has the shortest, look up photoelectron spectroscopy and you'll see! Hope it helps!
what phenomenon occurs after mass extinction?
Answer:
Diversification and adaptive radiation.
Explanation:
What does the symbol △ in a chemical equation mean?
Answer:
Delta, or subject to change.
Explanation:
Δ→ triangle indicates that the reaction is being heated.
What is a chemical equation?Chemical equations are symbolic representations of chemical reactions in which the reactants and the products are expressed in terms of their respective chemical formulae.
To express heating, we usually use Δ over reaction arrows like:
[tex]CaCO_ 3[/tex]. Δ → [tex]CaO+O_2.[/tex]
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Colour in acid of red litmus paper
Red
Litmus paper turn red when it comes in contact with acid. It turn blue if it come in contact with a base. Neutral litmus paper is purple
Which of these describes a challenge that the engineer of a high-altitude
airplane would need to consider?
A. More fuel is used at higher altitudes.
B. The airplane may succumb to the power of gravity as lift
decreases at higher altitudes.
C. The airplane may need a heat shield for protection from sonic
booms.
O D. The airplane will create more drag at higher altitudes than lower
altitudes.
Answer:
I think its (B)
Explanation:
as when the air thins out at higher elevations, your lift decreases so at some point, the plane cant produce enough lift to overcome gravity.
answer this pls thanks
Answer: It is element nitrogen. It has an atomic number of 7 and the valence electron is 5. It needs 3 electrons to complete its octet state. That's why sometimes it has the oxidation number of -3 in ammonia.
I will pick the brainiest answer! Thanks! :)
1. What is the difference between a chemical and physical change?
2. What is the difference between a property and change?
Answer:
1. What is the difference between a chemical and physical change?
physical change :-
no substance is formedproperties of components before and after are the samereversibleexample:- solubility, melting, condensation and boilingchemical change :-
new substance is formedproperties of components before and after are differentirreversible example:- burning, rusting, oxidation and neutralisation2. What is the difference between a property and change
change:-
A physical change in a substance doesn't actually change what the substance is. It remains the same. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.
property:-
A physical property is an aspect that can be observed or measured without being changed. A chemical property may only be observed by changing the chemical identity or substance.
HOPE THIS HELPS
Mass number is
O the average atomic mass of an element.
O the total number of electrons in an atom of an element.
O the total number of protons in an atom of an element.
O the total number of protons and neutrons in an atom of an element.
Answer:
4 th is the answer......
PLEASE HELP
The Octet Rule explains why
A. Atoms form chemical bonds to create compounds
B. The electronegativity of fluorine is higher than chlorine
C. Ionic compounds have high boiling and melting points
D. Valence electrons are used in chemical bonding
E. Valence electrons are used in chemical bonding
It's not D that's all I know. Please answer with an explanation if you know.
Answer:
Explanation:
E
If the temperature of a substance increases will the particles of that substance be moving faster or slower or at the same speed as they were before the temperature changed
Answer:
If the temperature increases, temperature reflects the speed of the molecules, so if the molecules are at a higher temperature, they are faster and they start to break bonds and new things react.
Explanation:
Does the model correctly represent the electron dot diagram of magnesium? Why or why not? Check all that apply.
M g with 1 dot above and 1 right.
*{Yes, because the chemical symbol of magnesium is Mg.}
No, because the chemical symbol of magnesium is Mn.
*{Yes, because magnesium has two valence electrons.}
No, because magnesium has seven valence electrons.
No, because both of the dots should be on top of the chemical symbol
Answer 1 and 3
Answer:
1 and 3
Explanation:
Answer: A and B or 1 and 3
Explanation:
As water is cooled, its density increases until it reaches about
A. 4°C
B. 25°C
C. O'C
D. -2°C
Using the three words below (cell wall, cell membrane and animal cell) construct your own sentence using what you have learned about plant and animal cells. PLEASE HELP ME IT WILL BE
Answer:
Explanation:
Both eukaryotic and prokaryotic cells have a cell membrane, which defines the limit between the environment surrounding the cell and the cell itself.
Eukaryotic cells can be either animal cells or plant cells. Plant cells, apart from the membrane, are surrounded by a cell wall that is thick and conformed by carbohydrates and peptides. This cell wall makes the cell resistant and gives it its shape. Animal cells, on the other hand, do not have cell walls, they only have the cell membrane, that regulates the entrance of nutrients and the exit of metabolic products.
Who knows the answer to this please help
An object has a mass of 441 g and a volume
of 10 cm3. What is the density of the object
in g/cm3?
The density is the ratio of the mass to the volume. The density of the object is 44.1 g/cm³.
What is density?Density (ρ) is the quantitative measurement of the substance having grams of mass that are dissolved per cubic meter of the solution. The density is calculated as:
ρ = M ÷ V
Given,
Mass of the object = 441 gm
The volume of the object = 10 cubic meter
Density is calculated as:
ρ = 441 ÷ 10
= 44.1 g/cm³
Therefore, 44.1 g/cm³ is the density of the object.
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If 175 grams of lead (ll) iodide is produced from the reaction, how many moles of potassium nitrate are produced?
Equation: 2KI + Pb(NO₃)₂ = 2KNO₃ + Pbl₂
Moles of potassium nitrate produced : 0.76
Further explanationThe reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction
2KI + Pb(NO₃)₂ ⇒ 2KNO₃ + Pbl₂
MW KNO₃ : 101.1032 g/mol
MW Pbl₂ = 461,01 g/mol
175 grams of Pbl₂ , mol :
[tex]\tt mol=\dfrac{175}{461.01}=0.38[/tex]
mol ratio KNO₃ : Pbl₂ = 2 : 1, so mol KNO₃ = 0.38 x 2 = 0.76
Mass of KNO₃ :
[tex]\tt mass=0.76\times 101.1032=76.838~g[/tex]
Need help ASAP!!please
Help please! I’ll mark brainliest to who ever answers this first!!
Answer:
paleontologists is the answer to scientist who studies fossil
Adding or removing thermal energy causes a change in state of matter.
O True
O False
Answer:"You can change an object's state of matter by adding or removing thermal energy. When you add thermal energy to an object, these things can happen: Particles move faster (increased kinetic energy). Particles get farther apart (increased potential energy)."
Explanation:
Where do you find the Group 1 and Group 2 metals?
Answer:
far left
Explanation:
This is to all the people who keep asking dating questions on brainly
It's not tender
Answer:
AGREE
Explanation:
thanks for the free points also :)
Carbon dioxide is formed by the given formula.
C(s)+O2(g)→CO2(g)
Carbon dioxide is
A
a compound of two elements, carbon and oxygen.
B
a mixture of two compounds, carbon and oxygen.
C
a compound of two atoms, carbon and oxygen.
D
an element of two atoms, carbon and oxygen.
Answer:
A
Explanation:
What is one example of pre-exising marine life?
dinosaur egg
shrimp burrow
leaf imprint
bird bone
Answer:
Shrimp burrow
Explanation:
Shrimp are types of sea life, whales eat them
How many Mg atoms are found in 1.00 mole of MgO?
Answer:
From the equation above we get 1 amu = 1g/NA or 1 amu = 1.66054x10^-24 g. Thus, a mole of magnesium atoms has a mass of NA x 24.305 amu x (1.66054x10^-24 g/amu) = 24.305 g. A mole of magnesium atoms has a mass of 24.305 g.
Explanation:
1 mole of MgO has 146.35 × [tex]\rm 10^2^3[/tex] atoms of Mg.
The number of atoms found in a mole of compound has been given by relationship between the mole and the Avogadro number. The Avogadro number has been the constant that has been given by the number 6.023 × [tex]\rm 10^2^3[/tex].
The relationship between the atoms and mole has been given by:
1 mole = 6.023 × [tex]\rm 10^2^3[/tex] atoms.
So, the number of atoms that has been present in1 mole of the MgO has been equivalent to the Avogadro number.
Thus, 1 mole of MgO has 6.023 × [tex]\rm 10^2^3[/tex] atoms.
The mass of there has been 1 molecule of Mg in the MgO compound, thus, the atoms of Mg can be given by:
Mg atoms = Mass of Mg × Avogadro number
Mg atoms = 24.3g × 6.023 × [tex]\rm 10^2^3[/tex]
Mg atoms = 146.35 × [tex]\rm 10^2^3[/tex]
Thus, 1 mole of MgO has 146.35 × [tex]\rm 10^2^3[/tex] atoms of Mg.
For more information about the number of atoms, refer to to the link:
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If the atomic number of an element is 16, what is the element's identity?
What is its atomic mass
Answer: The element is sulfur and the atomic mass is 32.07
Explanation: wasn’t sure what you were asking so gave you both
ummmm im in 2nd period and in test prep
whats the formula for mass
Answer:
The unit of molar mass is kg/mol. Where, m = mass, v = velocity.
Hope that helps :)
Which of the following elements is a metalloid? A. phosphorus B. cobalt C. silicon D. magnesium
Answer: silicon
Explanation:it just is
Respuesta
es la C. silicio
Explanation:
No existe una definición estandarizada de elemento metaloide ni un consenso completo sobre los elementos que son metaloides.
En la clasificación de metaloides se suelen incluir a:
Boro (B)
Silicio (Si)
Germanio (Ge)
Arsénico (As)
Antimonio (Sb)
Telurio (Te)
Someone answer these please! It’s multiple choice
Answer: Number 1 is titanium.
The one where you calculate a tin block is 13.0cm.
3. Is A) Same Density And Same Chemical Properties.
4. Is also A. Ne
Explanation:
What is the concentration of a solution of 10. Moles of copper nitrate in 5.0 liters of solution
Answer:
10.5
Explanation:
well we added together so thats the result
Beaux has purchased a synthetic material for a product he is launching. What is most likely a benefit of this material?
It is biodegradable.
It can be recycled cheaply.
It is heavy.
It can be mass produced.
Answer:
The answer is D. it can be mass produced
Explanation:
Answer:
The answer is D It can be mass produced.
Explanation:
I just took the test