After moving down a group in the periodic table, the number of valence electrons
the number of Valence electrons remains the same
How many protons, neutrons, and electrons are in an atom of beryllium with a mass number of 9?
A) 5 protons,5 electrons,4 neutrons
B) 4 protons,4 electrons,4 neutrons
C) 4 protons,4 electrons,9 neutrons
D) 4 protons,4 electrons,5 neutrons
Answer:
c / a
correct me if im wrong
Answer:
D) 4 protons, 4 electrons, 5 neutrons
A chemist heats a gas within a sealed, rigid container. Which statement describes the changes that occur in the gas? (1 point)
-The gas particles move slower and hit the sides of the container with less force, consequently, the pressure
increases
-The gas particles move slower and hit the sides of the container with less force, consequently, the pressure decreases
-The gas particles move faster and hit the sides of the container with more force, consequently, the pressure
increases
-The gas particles move faster and hit the sides of the container with more force, consequently, the pressure
decreases
When a gas is heated in a sealed container, the gas particles move faster and hit the sides of the container with more force leading to an increase in the pressure of the gas.
An increase in the temperature of a gas increases the collision rate of the molecules of the gas according to the kinetic theory.
With increased kinetic energy, the molecules of the gases collide more frequently with each other and the walls of the container.
The collision creates an increase in the magnitude of pressure inside the container.
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Answer:
C
Explanation:
When a gas is heated in a sealed container, the gas particles move faster and hit the sides of the container with more force leading to an increase in the pressure of the gas.
How does VSEPR theory describe the double bonds between the central carbon atom and each oxygen atom of Co2?
The double bonds in CO2 are counted as single regions of electron density.
The valence shell electron pair repulsion theory VSEPR is a description of the shape of molecules based on the number of electron pairs that surround the central atom in the molecule. Double bonds are counted as a single region of electron density.
Hence, the two double bonds in CO2 are counted as two regions of electron density around the central carbon atom. Hence, the molecule is liner at a bond angle of 180 degrees.
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A chemist wants to extract the gold from 54.9 g of AuCl3*2H20 *gold(III) chloride dyhydrate) by electrolysis of an aqueous solution. What mass of gold could be obtained from this sample? Answer in units of g
From the information provided in the question, the mass of gold that can be obtained from this sample is 31.5 g of Au.
Given that the reduction of gold III occurs thus;
Au^3+(aq) + 3e ------> Au(s)
Number of moles of gold(III) chloride dihydrate = mass/molar mass = 54.9 g /339.35 g/mol = 0.16 moles
Number of moles of Au^3+ in AuCl3.2H20 = 0.16 moles
Now;
1 mole of Au has a mass of 197 g/mol
0.16 moles of Au has a mass of 0.16 moles × 197 g/mol/1 mole
= 31.5 g of Au.
The mass of gold that can be obtained from this sample is 31.5 g of Au.
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Why can't percent yield be greater than one hundred percent?
Answer:
Percent yield is the maximum amount of product that can be formed in a reaction. Matter cannot be created or destroyed according to the law of conservation of mass, so you cant have over 100%.
Explanation:
A student pours ammonium nitrate into a container of room temperature water. The student stirs the mixture with a stirring rod and then feels the outside of the container, which is cold to the touch. Which material is part of the system that absorbed heat?
the water
the air
the stirring rod
the container
The material that absorbs the heat of the system is water owing to its high specific heat capacity.
The specific heat capacity of a substance refers to the amount of heat that is capable of increasing the temperature of 1 Kg of a body by 1 K. The higher the specific heat capacity, the more the amount of heat that the body can absorb without temperature change.
The material that absorbs the heat of the system is water because water has a higher specific heat capacity than all the other materials present.
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The material which is part of the system that absorbed heat is; The water.
Discussion:
According to the question;
Water was initially at room temperature.We know by convention, ammonium nitrate is a cold substance.In essence, the heat liberated from the system must have been absorbed by the water so that the outside of the container after mixing becomes cold.
This is so because water has a high specific heat capacity.
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What is the formula for this compound?
2 atoms of aluminum, 3 atoms of sulfur
Answer:
A
Explanation:
2 atoms of aluminum, 3 atoms of sulfur
Aluminum = Al
Sulfer = S
i just took the test
The formula for 2 atoms of Al and 3 atoms of S is Al₂S₃ and is named Aluminium Sulphide.
How are the formulas of the compound formed?Al has atomic no. =13, S has atomic no.=16
So the valencies of the given elements are
Al⁺³ and S⁻² to attain the noble gas configuration.
Al⁺³↘ ↙S⁻³
Al₂S₃
Cross multiply the valancies for the formation of molecular formula.
Hence, the formula is Al₂S₃.
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The last layer in layered design is _____________. Object Process None of the options Atoms Sub process
The last layer in the layered design is system layer so none of the above is the correct option.
Robotic Process Automation is a software technology that make use of some programs of computer to copy or mimic the behaviors of human when it has access with them. They been use effectively and ensure the work is perfectly done.
There are layers in the Robotic process automation but the last layer is System layer.
They can handle high volume of tasks.
The lowermost layer is associated with individual screen interactions. The lowermost layer in the layered design of Robotic process automation is the component layer or system layer . The Robotic Process Automation and this form technology is in robots creation.
Therefore, The last layer in layered design Is System layer so none of the above is the correct option.
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For an electric toothbrush, is input energy equal to useful output energy? Explain
your answer.
No, input energy is not equal to useful output energy, if it is an electric toothbrush.
What is the useful type of energy produced in an electric toothbrush?Electrical Energy is the useful type of energy produced in an electric toothbrush.
If input energy is equal to useful output energy. This means that the total amount of energy that is in an isolated system (such as an engine or a generator) remains constant (conserved) over time.
However, the total amount of useful energy output of an isolated system is never equal to the total energy input.
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Please help me with this
Beer Lambert Law Explanation
Answer:
The Beer–Lambert law, also known as Beer's law, the Lambert–Beer law, or the Beer–Lambert–Bouguer law relates the attenuation of light to the properties of the material through which the light is travelling.
Explanation:
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What is the difference between a conductor and an insulator?
The Lewis dot model of an atom has seven dots. Which of the following is true about the atom?
A) it has seven energy levels.
B) it has one valance shell electron.
C) it requires one electron to complete it’s octet.
D) it requires seven other atoms to form a stable compound.
It requires one electron to complete its octet
The Lewis dot model of an atom has seven dots. The statement true about atom is,
It requires one electron to complete it’s octet.So, option C is correct one.
What is Lewis dot model?The simple representation of the valence shell electrons in a molecule.The Lewis structure is also known as Lewis dot formula, electron dot structure, Lewis dot structure, Lewis electron dot structure.It is used to show the arrangement of electrons around individual atoms in the molecule. In this representation valence electrons of atom is shows as dot or bonding electrons as a line between two atoms.What is valence electrons?The electron/electrons present in valence shell is called valence electrons. Each atoms require eight electrons to complete their octet or valence shell.
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what is combined to get calcium chloride
Answer:
See below
Explanation:
This is a simple reaction.
Calcium and chlorine molecule are combined to get calcium chloride.
Ca + Cl₂ → CaCl₂
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH180720 PIONTS PLZ HELP
What mass of calcium chloride is needed to make 330.0 mL of 0.125 M
solution?
Answer:
4.58g
Explanation:
1.) What is the molar mass of CaCI2?
= 110.98 g/mol
2.) Find the mols
[tex]conc = \frac{mol}{volume(l)} [/tex]
conc × volume= mol
0.125 M x 0.33 L = 0.04125mol ( 330mL was converted to "L" by dividing 330 by 1000)
3.) The mass(g)
g= mol x atomic weight
g= 110.98g/mol × 0.04125
= 4.58 g
# NOTE M = mol/L
What part of the periodic table does the neutrons tell us about the element?
Answer:
The neutrons tell us if it is an isotope or not, they also hold the atom together.
Explanation:
Na2SO3" represents sodium sulfite. What does the 4 mean in the formula 4Na2SO3? There are four atoms of sodium. There are four atoms of sodium sulfite. There are four molecules of sodium sulfite. There are four elements in sodium sulfite. 7
The World on Turtle's Back" is a creation myth because it focuses on characters whom the Iroquois considered "gods. " is an Iroquoian story about people and animals who talk to each other. Explains how the Iroquois believe that the earth was created. Describes Iroquoian social and cultural values.
The designation "4" before Na2SO3 simply means that there are four molecules of sodium sulfite.
A molecule is formed when two or more atoms of the same or different elements come together. The formula of the molecule must reflect the number of atoms from which it is formed. The designation "4" before Na2SO3 simply means that there are four molecules of sodium sulfite.
The "The World on Turtle's Back" is a legend creation story. According to this story, the world was created on a giant turtle back. The folktale is common among the Iroquois Native Americans.
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how many moles of water in 100 grams
Answer:
There are approximately 5.55 moles
Explanation:
Why does liquid move like it does when heated on the right side?
Answer:Liquids expand for the same reason, but because the bonds between separate molecules are usually less tight they expand more than solids.
Explanation:Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.
please help quickly
Rubia was given a type of inclined plane called a ramp in her science class. Her teacher told her that the ramp should have a mechanical advantage of 3.
Rubia pulled a block up the ramp, but afterward she calculated that the mechanical advantage of the ramp was 2.8 instead of 3. Her teacher said she did not make a mistake. What did Rubia calculate?
A.
the actual operating power of the ramp
B.
the actual mechanical advantage of the ramp
C.
the ideal mechanical advantage of the ramp
D.
the ideal operating power of the ramp
Answer: B. The actual mechanical advantage of the ramp.
Explanation:
The professor saying that the ramp SHOULD have a mechanical advantage of 3 indicates that that would be the ideal mechanical advantage. Since Rubia calculated it to be 2.8, that means that it is the acutal mechanical advantage. The actual advantage will be reduced from the ieal due to things like friction.
What is the frequency of the above wave?
Answer: is a measurement of how often a recurring event such as a wave occurs in a measured amount of time
Explanation:
What are ocean currents?
Answer:
What are ocean currents?Ocean currents are continuous movements of water in the ocean that follow set paths, kind of like rivers in the ocean.3) The nucleus in a photograph of a cell measures 3 mm across. If the magnification in the photograph is x 500, what is the actual size of the nucleus?
Answer:
1500mm oqkwndbdjdhdndjdd
Explain what happens during soil depletion and also how we can help prevent this naturally without chemicals?
PLZ FAST TYY <3
Answer: create more healthy products for the soil and animals
Explanation:
1. While on a movie set, a stuntman jumps off
the roof of a building. As he falls toward an
airbag, what is increasing?
A. gravity
B. wind velocity
C. kinetic energy
D. potential energy
kinetic energy kkkkkkkkkk
What is the one defining abiotic factor of a desert?
cold temperatures
high winds
little or no rainfall
high humidity
Hello! :p .
deserts are known to have little to no rain fall & drop to very low temperatures at night! I hope this helps!
Answer: little or no rainfall
Explanation: Precipitation, sunlight, and temperature are all abiotic factors.
Deserts have a lack of rainfall.
Some deserts are hot, some deserts can be cold too.
Abiotic factors are extreme temperatures of the day and night the fast winds the strong amount of sunlight scarcity of water
what happens when you add vinegar to baking soda
Answer:
When baking soda is mixed with vinegar, something new is formed. The mixture quickly foams up with carbon dioxide gas. If enough vinegar is used, all of the baking soda can be made to react and disappear into the vinegar solution.
Explanation:
why does fluorine have the highest electronegativity
Answer:
- Fluorine has 5 Electrons in its 2P shell
- Fluorine is so close to ideal Electron Configuration, the Electrons are held very tightly to the Nucleus.
Explanation:
Hopefully this was helpful!
What does the answer of element 3Na2S2O3?
Answer:
Explanation:
3× 22+2×32+ 6×16=
66+64+96=236
What is pseudoscience and how is it different from science
Answer:
a difference in attitude
Explanation:
It's just not science. ... The big difference Popper identifies between science and pseudo-science is a difference in attitude. While a pseudo-science is set up to look for evidence that supports its claims, Popper says, a science is set up to challenge its claims and look for evidence that might prove it false.