Answer:Atoms acquire the stable electron structure of a noble gas by losing electrons. An atom of an element in Group 1A has seven valence electrons. Among Group 1A and 2A elements, the group number is equal to the number of valence electrons in an atom of that element.
Explanation: Hope this help have an wonderful day and stay safe! :D
How many bonds and lone pairs are in the molecule SIH4?
A.2 bonds, 2 lone pairs
B.4 bonds, 4 lone pairs
C.no bonds, 4 lone pairs
D.4 bonds, no lone pairs
Answer:
there are no valence electrons left over, so the molecule has four bond pairs and no lone pairs.
Explanation:
The compound Mg(OH)2 is incorrectly named magnesium dihydroxide.
Explain the errors)
Answer:
Mg(OH)2 is an inorganic compound and it's a base.
because it has a hydroxide ion and its name is magnesium hydroxide
What is a primary role of decomposers in an ecosystem?
Select one:
O a. They eliminate matter by taking nitrogen from the ecosystem.
O b. They eliminate matter by taking phosphorus from the ecosystem.
O c. They cycle matter by returning carbon and other matter to the ecosystem.
O d. They cycle matter by returning oxygen and other matter to the ecosystem.
Answer:
c
Explanation:
they use oxygen in their breakdown process and at the end of the breakdown they return nutrients like carbon dioxide and nitrogen back to the ecosystem.
Answer:
c. They cycle matter by returning carbon and other matter to the ecosystem.
162.4 NH3 =____mol NH3
Answer:
162.4
Explanation:
Because yea thats the answer no need to tell you why ok bye
Which statement best describes physical properties?
A. Physical properties behave identically for all matter under the same conditions.
B. Physical properties can be observed without changing the identity of a substance. C. Physical properties are observed by seeing how a substance reacts with other substances.
D. Physical properties cause atoms and molecules to change structure when substances are mixed.
Answer:B
Explanation:
According to the cup wall diagrams, why does the double wall vacuum
sealed cup outperform the other two cups
Because the particles are moving so fast in a vacuum that
they are able to pass through the walls and transfer more
kinetic energy to the liquid in the cup.
B
The vacuum allows for the all of the particles to pack in tightly
therefore nothing can pass through.
There is little to no transfer of kinetic energy between the
walls of the cups because there are no particles in a vacuum.
And since there is little to no transfer of kinetic energy there
is little to no transfer of temperature. Therefore the liquid
inside stays warmer/colder longer.
The particles in a vacuum do not move at all. Therefore there
is no kinetic energy and nothing can be transferred.
Answer:
i do not now
Explanation:
Which of the following explains a difference between genes and chromosomes
Answer:
Dude I need the answers so i can help you!
Explanation:
Give me the answers plz
Which statement accurately describes radioactive dating?
O Geologists use only one type of radioactive dating.
O Geologists compare parent and daughter elements to determine rock type.
O Geologists will measure how stable multiple parent elements can decay into multiple daughter elements.
Geologist compare the observed abundance of naturally occurring radioactive isotopes and their decay products
using decay rates.
Answer:
its d and can i get brainliest plz:)
Explanation:
The statement accurately describes radioactive dating Geologist compare the observed abundance of naturally occurring radioactive isotopes and their decay products using decay rates.
What is radioactive substance?A substance in which a unstable nuclei is contained is called as radioactive substance. Radioactive decay is a process in which an unstable nucleus loses energy by the process of radiation. There is a random process that happens in radioactive substances that is radioactivity. The type of product produced after radioactive emission depends on the type of radioactive decay.
Radioactive decay can be of different types like alpha decay, gamma decay or beta decay. Alpha particles, beta particles or gamma particle are emitted in these.
Given options are-
Geologists use only one type of radioactive dating.
Geologists compare parent and daughter elements to determine rock type.
Geologists will measure how stable multiple parent elements can decay into multiple daughter elements.
Geologist compare the observed abundance of naturally occurring radioactive isotopes and their decay products using decay rates.
Therefore, The statement accurately describes radioactive dating Geologist compare the observed abundance of naturally occurring radioactive isotopes and their decay products using decay rates.
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How are a proton and a neutron alike?
A. Each is found outside the nucleus.
B. Each has a positive charge.
C. Each has a mass of1 amu.
D. Each has a charge that balances the charge of an electron.
A. Each is found outside the nucleus
Why must the final product of a decay series be stable?
a. The daughter isotope of any radioactive decay is stable.
b. No decay chain can emit more than two particles.
c. Each decay results in a net loss of particles.
d. If the daughter isotope is unstable, it will decay.
Answer:
I think its d
Explanation:
Because isotopes decay due to being unstable so if the daughter isotope is unstable it will just decay till it produces a stable isotope
Answer:
d. If the daughter isotope is unstable, it will decay
Explanation:
got it correct on quiz
3.2 g of a gas at occupy the same volume as 0.6266 g of CH4 at 17°C at constant pressure
Find the molecular mass of the gas.
Assuming gas temperature = 25, 3.2 g of a gas at 25°C occupy the same volume as 0.6266 g of CH4 at 17°C at constant pressure
The molecular mass of the gas : 842.1 g/mol
Find the molecular mass of the gas.Further explanationGiven
3.2 g of gas
0.6266 g of CH4
Required
the molecular mass of the gas
Solution
Because V, P, and R are the same, from ideal gas law :
PV=nRT
n₁T₁=n₂T₂
n₂=moles CH₄= 0.6266 : 16 g/mol = 0.0392
T₁=25+273=298 K
T₂=17+273=290 K
mol of gas :
[tex]\tt n_1=\dfrac{n_2.T_2}{T_1}=\dfrac{0.0392\times 290}{298}=0.038[/tex]
molecular mass :
[tex]\tt M=\dfrac{3.2}{0.038}=842.1[/tex]
What family has 4 valence electrons?
Answer:carbon group
Explanation:
The daily rotation of Earth causes ______ and _____. *
High Tide
Low Tides
Day
Night
Spring Tide
Neap Tide
Really need this!! for a big grade! thank you guys ~ please help!
Answer:
Day and Night
Explanation:
Google :)
Which part of the ocean has the lowest temperatures and highest salinity?
Answer:
The north atlantic contains the warmest and saltiest water of the major oceans, the southern ocean is the coldest, the north pacific has the lowest average salinity. This density signature is locked into the water parcel when it sinks
Explanation:
i think
a student wrote The Following hypothesis if more salt is added to a hypothesis
Answer:
i love adding salt to my hypothesis
Explanation:
How many atoms of hydrogen appear to be on the reactant side?
Answer:
Two
Explanation:
In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products.
Answer: 2 it has two
Explanation:
what is the correct lewis dot diagram for KCL
Which of the following best describes a galaxy?
A. a particle of debris in the solar system that does not act as a satellite of any planet.
B.a visible body of liquid or frozen crystal droplets suspended above a planetary surface
C. a massive system of stars, gas, dust, and dark matter bound together by gravity
D.The visible path of a meteoroid as it enters Earth's atmosphere
Need help ASAP
Answer: the anser is a
Explanation:
The galaxy is a massive system of stars, gas, dust, and dark matter bound together by gravity. Option C is correct.
What is gravity?The galaxy is a force of attraction that attracts the particles or abject towards themselves and it gets double the mass of the object and has the capacity to bound the objects.
In a galaxy all are revolving around the orbits and satellites due to gravity and all these stars dust etc are also part of the universe which is bounded by The galaxy is a massive system of stars, gas, dust, and dark matter bound together by gravity
Therefore, Option C is correct.The galaxy is a massive system of stars, gas, dust, and dark matter bound together by gravity
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Which of the following is NOT a chemical change?
A. Tarnishing silver
B. Melting butter
C. Digesting food
D. Baking a cake
Answer:
Melting butter
Explanation:
You can reverse the change of butter back to its original state but you can never reverse the rest back to there original state
Is it possible to have more atoms on the product side of a chemical reaction than there are on the reactant side? Explain why or why not.
Answer:
No, you cannot.
Explanation:
Due to the Law of Conservation of Energy all chemical equations have to be balcned. The Law of Conservation of energy states that matter cannot be neither created nor destroyed. By having more atoms on either side, you are breaking this law.
Which organism is able to form organized patterns of behavior through the process of integration because it has ganglia?
-mouse
-shark
-grasshopper
-flatworm
Answer:
flatworm
Explanation:
Select three parts of the cell theory.
A- All cells come from pre-existing cells.
B- Cell is the official name of the smallest unit of life.
C- All plants and animals are made from cells.
D- Cells are the basic unit of structure and function in organisms.
ASAP!! Which one of the following substances can be produced during an acid-base neutralization reaction?
A. Al(OH)3
B. HCl
C. H2O2
D. MgBr2
Answer:
c
Explanation:
because it's a form of wayer jgc
Which of these do plants need for photosynthesis to occur?
OA.
glucose and water
ов.
glucose and carbon dioxide
OC.
water and carbon dioxide
OD.
water and oxygen
Answer:
OC. water and carbon dioxide
Explanation:
The equation for photosynthesis is Carbon dioxide plus water plus light energy yields sugar (glucose) and oxygen
Answer:
Water and carbon dioxide
Explanation:
We learned this in Grade 2.
Which equation is balanced?
Al+3O2→Al2O3
2Al+3F2→2AlF3
Na+F2→2NaF
Mg+2O2→2MgO
Answer:
3rd one
Explanation:
I just took the test and got 100%
Answer:
2nd one
Explanation:
Took the test
After studying weather, Beto bought a simple weather station and put it up in his yard. He was especially interested in wind and how it forms around Earth. Choose the correct words or phrases to complete the sentences.
Incomplete question. The remaining part reads;
Choose the correct words or phrases to complete the sentences.
Global winds occur due to
1. Choose...
a. solar currents
b. convection currents
c. sea breezes
d. uneven heating
over a large area and this forms
2. Choose...
a. solar currents
b. convection currents
c. sea breezes
d. uneven heating
caused by cool and warm air.
Answer:
1. d. uneven heating
2. b. convection currents
Explanation:
1. What Beto should know is that as the earth moves and rotates around the sun, some parts of the Earth receive more sunlight and others less, which then leads to uneven heating over a large area of the earth.
2. This uneven heat then forms a convection current containing varying patterns of air spreading to various parts of the globe.
From the formula, write the correct name for the ionic compound.
MgBr₂
KCl
Al₂S₃
BeCl₂
MgCl₂
GaN
CaO
BaO
AgBr
NaF
SrS
LiCl
AlP
CsI
From the Ionic compounds name, write the correct formula.
potassium chloride
magnesium bromide
aluminum sulfide
magnesium phosphide
calcium oxide
barium oxide
Answer: mgbr2 magnisum bromide
KCI potassium chloride
AI2S3 aluminum sulfide
MG3p2 magnisum phosphide
CaO calcium oxide
BaO barium oxide
Explanation:I did this one time
What will happen to the gas molecules in the container as thermal energy is applied?
a-The movement, kinetic energy, and pressure of the molecules will increase.
b-The movement, kinetic energy, and pressure of the molecules will decrease.
c-The movement, kinetic energy, and pressure of the molecules will stay the same.
d-The movement of the molecules will increase, but the kinetic energy and pressure of the molecules will stay the same.
PLZ HELP I HAVE A BENCHMARK TEST!!!!
Decreased because we all know what happen if we put it with thermal energy
When thermal energy is supplied to gas molecules in the container, the movement, kinetic energy, and pressure of the molecules will increase.
Gas molecules are in constant random motion. They collide frequently which other and the walls of the container.
When thermal energy is applied, the gases move faster (acquire higher velocity). The kinetic energy also increases accordingly.
As a result of the increase in thermal energy, gas molecules collide with the walls of the container more frequently (pressure increases).
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Help me real quick !!
Answer:
yellow
if not sorry that's though the best answer
Explanation:
someone plss help me ASAP
Answer:
18
Explanation:
You add the two numbers on the bottom left (8 and 32) and then subtract the number On the bottom middle right (22) from it (40-22=18) and then the answer to that gives you the answer of how much water is produced.
hope that helped :)
