Answer:
Sound waves and light waves need to change places.
Explanation:
Given table:
Mechanical waves Electromagnetic waves
Ocean water Sound waves
Light waves Radiation waves
Earthquake waves X-ray waves
From the given table, to be correct, light and sound waves must change their position.
Light wave is an electromagnetic wave
Sound wave is a mechanical wave
An electromagnetic wave does not require a material medium for propagation.
Mechanical waves require material medium for their propagation.
Mechanical waves Electromagnetic waves
Ocean water Light waves waves
Sound waves Radiation waves
Earthquake waves X-ray waves
Answer:
Sound waves and light waves need to change
Explanation:
When does nuclear fusion start during the life of a star?
Answer:
Try searching this on google
Explanation:
I might have an answer but I am not entirely sure sorry I really tried to help but there is also an app called socractic it also helps with questions
Once the temperature reaches 15,000,000 levels Celsius, nuclear fusion takes location in the center, or core, of the cloud. The high-quality heat given off by means of the nuclear fusion technique motives the gasoline to glow creating a protostar. This is the first step in the evolution of a star.
Which statement best describes a difference between electromagnetic waves
and mechanical waves?
A. Mechanical waves can transfer matter through empty space.
B. Electromagnetic waves vibrate in two directions that are
perpendicular to each other.
C. Mechanical waves transfer matter, not energy, from one place to
another.
D. Electromagnetic waves require empty space to transfer energy
from one place to another.
Answer:
C
Explanation:
electronic waves transmits energy but mechanical waves require a medium in order to transport their energy from bgg one place to another.
Answer:
it is B.) Electromagnetic waves vibrate in two directions that are
Explanation:
stay safe 2021
69. Sequencing Arrange these hydrates in order of
increasing percent water content: MgSO;-7H.O.
Ba(OH)2-8H.O. COC1, 6H2O.
In order of increasing percent water content:CoCl₂.6H₂O, Ba(OH)₂.8H₂O, MgSO₄.7H₂O
Further explanation[tex]\tt \%element=\dfrac{Ar~element}{MW~compound}\times 100\%[/tex]
CoCl₂.6H₂O.MW=237.90 g/mol
6H₂O MW = 6.18=108 g/mol
[tex]\tt \%H_2O=\dfrac{108}{237.9}\times 100\%=45.4\%[/tex]
MgSO₄.7H₂O.MW=246.48 g/mol
MW 7H₂O = 7.18=126 g/mol
[tex]\tt \%H_2O=\dfrac{126}{246.48}\times 100\%=51.1\%[/tex]
Ba(OH)₂.8H₂O MW=315.48 g/mol
MW 8H₂O = 8.18=144 g/mol
[tex]\tt \%H_2O=\dfrac{144}{315.48}\times 100\%=45.6\%[/tex]
Tubbo or TommyInnit? Choose wisely.
Answer:
Tubbo
Explanation:
more informational
The periodic table organizes elements according to INCREASING
A)
atomic mass.
B)
energy level
C)
atomic number
D)
valence number
Answer:
C)
atomic number
Explanation:
C)
atomic number is also the number of protons an atom has and this number will never change unlike number of neutrons or electrons.
BRAINLIEST! Please help me answer the following questions:
1) How do you find the valency of an element?
2) How do you determine if an element is nuetral/an isotope/ or an ion?
If you could help with 1 or both questions I would really appreciate it :)
Explanation:
1) from the periodic table for example if u looking for K it is from the group 1A so the valancey = +1 that is mean it loses one electron to reach a stable state. and this applied for the 1A , 2A, 3A groups.
if u looking for N it is from group 5A so its valency is -3
so it gain 3 electrons to reach a stable state to complete its orbital to 8 electrons. this applied to 5A, 6A,7A
for the transition metals and simimetals other rules.
2) neutral if the element does not hold any charge like
H2, O2, N2, Fe, Au, Cu ...
isotope : if the 2 elements have same symbol and atomic number but they differ in the mass number because the have different numbers of neutrons.
if the element is charged then it is considered as an ion ex: Fe2+ then it is iron cation ( +ion)
F- then it is fluoride anion (-ion)
if u have any doubt just writ a comment ( ;
i need help on these questions please!!!
the link for the vid will be in the comments
5 points
An atom has a mass number of 65. Its number of
neutrons is the sum of its atomic number and 3. How
many protons, neutrons, and electrons does this atom
have? What is the identity of this atom? *
(justify your answer step by step!)
Answer:
25 protons, 25 electrons, 30 neutrons. ......... manganese is the identity
Explanation;
x = atomic number -# of protons
The number of neutrons = x + 5
The mass number (sum of protons + neutrons) = 55.
x + (x + 5) = 55
2x + 5 = 55
2x = 50
x = 25; atomic number 25 = manganese (Mn)
so ;
25 = Protons
30=Neutrons
25=Electrons
Ozone consists of three oxygen atoms (O3) and water consists of two hydrogen atoms and one oxygen atom (H2O). Would you consider both products to be molecules?
Answer:
Yes, both are molecules
Explanation:
A molecule is the smallest particle of a substance that can exist alone and still retain the chemical properties of that substance.
Molecules are usually made up of two or more atoms of the same or different elements chemically combined together. for example, two atoms of hydrogen will combine to form a molecule of hydrogen gas. Similarly, an atom of hydrogen can combine with an atom of chlorine to form hydrogen chloride gas molecule.
Ozone is a molecule which consists of three atoms of oxygen chemically combined together.
Similarly, water is a molecule composed of two atoms of hydrogen and an atom of oxygen chemically combined together.
How do changes in wind currents affect the short-term climate in a region?
Prevailing winds can cause a milder climate with heavy rain.
Global winds can cause a longer summer.
Prevailing winds can cause heavy rains or a dry climate.
Global winds can cause a longer winter.
Answer:
a
Explanation:
Prevailing winds can cause a milder climate with heavy rain is the change that affects the short-term climate in a region, hence option A is correct.
What is wind currents?Concentrated areas of winds are known as air currents. They primarily result from variations in the temperature or atmospheric pressure.
The horizontal and vertical currents are present at the mesoscale, whereas horizontal currents predominate at the synoptic scale.
A region's short-term climate can be dramatically impacted by changes in wind currents. As they move moisture from one place to another, prevailing winds can result in a milder climate with heavy rain.
As a result, the impacted area may see higher precipitation and a more temperate environment.
Therefore, prevailing winds can cause a milder climate with heavy rain can impact the short-term climate in a region.
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how to write the ionic formula for the K1+, MnO41- pair of ions
Answer:
Ionic formula: KMnO4
Explanation:
Pottasium permanganate (KMnO4) is an ionic compound that contains a combination of pottasium cations (K+) and permanganate anion (MnO4-). The pair of ions that make up the ionic compound cancel out each other to make it neutral.
K+ (aq) + MnO4- (aq) → KMnO4 (aq)
MnO4- contains 1 atom of manganese with a (+7) charge and four atoms of oxygen with a (-2) charge each. This forms a +7 for Mn and -8 for O4, hence, a net total of -1.
PLEASE HELP WITH THESE TWO QUESTIONS
2.) 50.0 grams of water at 100 degrees Celsius evaporated to water vapor 2 points
at 100 degrees Celsius. Calculate the amount of heat required for this
conversion.
2. A student measured 15.0 grams of ice in a beaker. The beaker was then
placed on a hot plate where it was heated uniformly for a certain amount
of time. During the melting process of the ice, the student noted that the
temperature was at 0 degree Celsius. When all the ice converted to water,
the final temperature was also at 0 degree Celsius. How much heat was
used to melt the ice?
1. Q=112.8 kJ
2. Q=5.01 kJ
Further explanationThe heat required for phase change :
melting/freezing :Q = mLf
Lf=latent heat of fusion
vaporization/condensationQ = mLv
Lv=latent heat of vaporization
1.
m=50 g=0.05 kg
Lv (water) = 2256 kJ/kg
[tex]\tt Q=0.05\times 2256=112.8~kJ[/tex]
2.
m=15 g=0.015 kg
Lf for water = 334 kj/kg
[tex]\tt Q=0.015\times 334=5.01~kJ[/tex]
All atoms, isotopes, and ions of Magnesium have the same...
atomic number
mass number
all of the above
charge
Answer:
option A: Atomic number
Explanation:
The atoms, isotopes and ions of magnesium doesn't change the atomic number of the magnesium.
For example, Isotopes are atoms that have the same number of protons but at the same time have different numbers of neutrons. This means that atomic number remains the same while mass number differs. Now, an ion is defined as an atom or molecule that has either a positive or negative charge.
So only option A is correct: Atomic number
draw out the following covalent molecules
Answer:
you did not show the whole page
Explanation:
3
1. The observed regularities in the properties of
the elements are periodic functions of their
(1) atomic numbers
(2) mass numbers
(3) oxidation states
(4) nonvalence electrons
Answer:
(1) atomic numbers
Explanation:
The observed regularities in the properties of the elements on the periodic table are periodic functions of their atomic numbers.
Atomic number is the number of protons in an atom. The periodic law states that "the properties of elements are a periodic function of their atomic number".Elements on the periodic table are arranged based on the atomic numbers they contain. The number of positively charged particles in an atom is the atomic number.The observed regularities in the properties of the elements are periodic functions of their atomic numbers.
Modern periodic law states that "Properties of elements are a periodic function of their atomic number not by their atomic mass". Modern periodic law was proposed by Henry Moseley in 1913. Physical and chemical properties of elements depend on the number of electrons and their arrangement.
Thus properties of elements are periodic function of their atomic numbers and not atomic masses. If the properties of an element depend on number of proton and neutron then the properties are periodic function of their atomic mass so we can conclude that the observed regularities in the properties of the elements are periodic functions of their atomic numbers.
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1+1 = ?
plz say plzplapL
how can the molar mass of a gas can be determined
Select all that apply. Choose the chemical formulas that are matched with their
correct name.
MgF2, magnesium (II) fluoride
BeO, beryllium oxide
NaCl, sodium chloride
AlF3, aluminum trifluoride
CaCl2, calcium chloride
Answer:
i think just these
NaCl
CaCl2
observe the long-term effects OT erosion on
1.
Click Play ( )). Wait for about 20,000 simulated years, then click Pause ( 1 ). If you want,
you can drag the landscape to rotate the view. How much does the landscape change?
Several erosive agents affect the soil structure and composition. Selecting sandstone, 100cm/yr precipitation, 20ºC, and 50% vegetation cover, there is 45% of eroded rock. The general landscape appearance changes little.
ErosionErosion is the process of fertile soil loss.
It is due to several external agents that damage the ground and drag the exposed material from the superficial layer of the earth.
Erosive agents
Some of the erosive agents are water, wind, ice, gravity, or animal trampling.
Phases
Three main phases compose the erosion process
a) particles landslide
b) transport of superficial free particles
c) deposit/sedimentation.
Soil erosion leads to its degradation.
Since its regeneration is extremely slow, erosion produces several negative events that lead to soil loss as a non-renewable natural resource.
Vegetation cover
All the erosive agents act together modifying the soil composition, shape, and structure. The loss of plant cover increases, even more, the erosive effects.
Soil vegetation cover reduces erosion because the aerial part of the plant protects the surface, while roots protect the ground structure and retain water.
The less vegetation cover there is, the more exposed the soil is, and the more severe effects the erosive agents cause.
In the exposed example, we have many variables to control and analyze their effect on soil erosion. Before playing the simulation, I chose the followings
Stones ⇒ sandstone Precipitation ⇒ 100 cm/yrTemperature ⇒20 ºCVegetation cover ⇒ 50%Under these conditions, after 20,000 years there was 0.42 km³ of eroded rock.
The general aspect of the landscape changed very little, suggesting that erosion occurs slowly.
Probably, if we change the values of the variables, we will observe a sharper change. For instance, if we take the vegetable cover to less than 20% and increase the levels of precipitation and temperature, we will observe a faster erosion process and a wider affected area.
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Water vapor particles are most likely to phase change into liquid particles If the vapor particles come into contact with:
a cold surface
Ono surface
a warm surface
O any surface at all - the temperature of the surface does not matter
Answer:
A cold surface I think.
Explanation:
A balloon filled with helium floats in the air. What does this tell you about the density of helium?
Answer:
helium is denser than air
Answer:
For air, which has a molar mass of 29.0 g/mol, this gives a density of 1.18 g/l. Helium, which has a mass of 4.00 g/mol, has a density of 0.164 g/l.
Formaldehyde, CH20, and acetic acid, C2H4O2, have the same empirical formula but different?
kinds of cations.
kinds of atoms.
b. kinds of anions.
d. molecular formulas.
Explanation:
molecular formula
....
Formaldehyde, CH20, and acetic acid, C2H4O2, have the same empirical formula but different molecular formulas. Therefore, option D is correct.
What is Chemical formula ?A chemical formula lists the elements that comprise the compound as well as the number of atoms of each element in the compound's smallest unit, whether a molecule or a formula unit. Knowing the elements' names and a few basic rules allows us to name simple compounds given a chemical formula.
Chemical formulas are classified into three types: empirical, molecular, and structural.
Empirical formulas depict the simplest whole-number ratio of atoms in a compound, whereas molecular formulas depict the number of each type of atom in a molecule and structural formulas depict how the atoms in a molecule are bonded to each other.
Thus, Formaldehyde, CH20, and acetic acid, C2H4O2, have the same empirical formula but different molecular formulas, option D is correct.
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How could you explain why soap is able to clean the oil and dirt off your bodies?
Answer:
When you wash your hands with soap, it dislodges the dirt, grease, oils, and disease-ridden fecal matter particles on your hands by creating these micelles. Surrounded by the soap, the oil molecules become suspended and distributed in the water rather than stubbornly clinging to your skin.
Explanation:
help please it’s due today
Answer: I would say it would move 70 N right
Explanation: Well lets say its mass is heavy from the looks of the picture its a big box, anyways the girl with have all of her 30 newtons into it making it easier to move for the boy with 40 newtons plus 10 newtons left doesnt make sense neither does the 70 N left but why would it only move 10 to the right is 70 newtons are being used
on it?
GIVING BRAINLYYY
Use the general trends of the periodic table to answer the following question.
Platinum (Pt) and gold (Au) are sometimes called noble metals because they are less reactive than other metals. Based on this evidence and the periodic table, which other element is likely to be less reactive?
According to the electronic configuration, along with platinum and gold silver is considered to be a noble metal.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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(URGENT!!!!!) the electron configuration of some elements are given. Based on the electron configuration which ELEMENTS can likely form ions with multiple charges?
a) zinc [Ar] 3d¹⁰4s²
b) iron [Ar] 3d⁶4s²
c) sodium [Ne] 3s¹
d) cobalt [Ar] 3d⁷ 4s²
e) silver [Kr] 4d¹⁰ 5s¹
Answer:
iron (Ar) 3d^6 4s^2 and cobalt (Ar) 3d^7 4s^2
Based on the electron configuration of elements Fe and Co can likely form ions with multiple charges.
What is electron configuration?Electron configuration of an element describes how electrons are distributed in its atomic orbitals. Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.
Electron configuration can be written according to the following rules-
1. Aufbau Principle
2. Pauli's exclusion principle
3. Hund's rule
Electrons will be filled according to the increasing order of the energy as per the n+l rule.
Given,
a) zinc [Ar] 3d¹⁰4s²
b) iron [Ar] 3d⁶4s²
c) sodium [Ne] 3s¹
d) cobalt [Ar] 3d⁷ 4s²
e) silver [Kr] 4d¹⁰ 5s¹
Except Co and Fe, all the elements when loose 1 or 2 electrons form full filled electrons, Fe and Co show +2, +3, +4 etc oxidation states.
Therefore, Based on the electron configuration of elements Fe and Co can likely form ions with multiple charges.
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Find the molar mass for NaNO3
Molar mass
= Atomic mass of Na + Atomic mass of N + Atomic mass of O3
= 23 + 14 + (16×3)
= 23 + 14 + 48
= 85 g per mole
what is the number of moles in 2.43 g Mg
please help it’s due today
Milk of Magnesia is a type of medication people can take to help with heartburn and indigestion cause by stomach acid.
If the pH of this solution is 10.5, which phrase would correctly describe Milk of Magnesia?
This substance would turn blue litmus paper to red.
This substance will likely taste sour.
This substance is acidic.
This substance is basic.
Answer:
This substance is basic.
Explanation:
The milk of Magnesia, a type of medication which can help people with heartburn and with a pH of 10.5 is a basic solution.
Bases are certain metallic oxides, metallic hydroxides and aqueous ammonia. They have the following properties: On the pH scale, they have a value between 7-14They turn red litmus paper blue. Bases are electrolytes. They have a bitter taste. They are soapy or slippery to feel.