Explanation:
one mole of any substance there are 6.022×1023 units of that substance. (This number is called Avogadro's number, NA.)
We need to convert the mass of silicon to moles using the molar mass of silicon, 28.06gmol. This number means that one mole of pure silicon would have a mass of 28.06g. Our given mass, however, is in milligrams; to convert this to grams we'll use the conversion factor 1g103mg:
5.86mg Si(1g103mg)=0.00586g Si
Now, using silicon's molar mass, we'll convert this mass to moles of Si:
0.00586g Si(1mol Si28.06g Si)=2.09×10−4mol Si
Finally, let's use Avogadro's number to convert
The number of atoms in a 92.8 mg sample of Si is 1.99×10²¹ atoms
From Avogadro's hypothesis, we understood that:
1 mole of Si = 6.02×10²³ atomsRecall,
1 mole of Si = 28.09 g
Now, we shall convert 28.09 g to mg. This can be obtained as follow:
1 g = 1000 mg
Therefore,
28.09 g = 28.09 × 1000
28.09 g = 28090 mgThus, 28.09 g is equivalent to 28090 mg
Therefore,
28090 mg of Si = 6.02×10²³ atomsFinally, we shall determine the number of atoms in 92.8 mg sample of Si. This can be obtained as follow:
28090 mg of Si = 6.02×10²³ atoms
Therefore,
92.8 mg of Si = [tex]\frac{92.8 * 6.02*10^{23}}{28090}\\[/tex]
92.8 mg of Si = 1.99×10²¹ atomsThus, 92.8 mg sample of Si contains 1.99×10²¹ atoms
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Are thermoplastics conductors of electricity?
Answer:
no it is not conductor of electricity
Explanation:
because thermoplastics made bad conductor of
electricity so, it is a insulator and not flow electricity
Around 1910, Rutherford bombarded gold foil with alpha particles. Most of the alpha particles passed straight through. To his surprise, a smaller number were deflected by 180°.
This summary recounts the scientific discovery of
something that absorbs alpha particles.
something that allows alpha particles through.
something that deflects alpha particles.
something that attracts alpha particles.
Answer:
something that deflects the Alpha particles
V=5, M=10 What is the density?
Answer:
the answer to this question is 2 kilogram/cubic meter
Explanation:
why is powdered magnesium used in fireworks,
rather than magnesium ribbon?
Answer:
Because it will give a faster reaction.
Explanation:
does sodium chloride retain any characteristic of sodium or chlorine?
Answer:
When this occurs, sodium will donate an electron (which is a negatively-charged particle) to chlorine. This makes sodium slightly positive and chlorine slightly negative. Opposite charges attract, right? So then, sodium ions will attract chloride ions and form an ionic bond.
Explanation:
what do guys like in a girl. whats ur type or like whats usually a guys type :)
Well, Some go for looks and some go's for the mind- I perfer the mind, Because I rather have a girl that isn't pretty and has a great personality. My type would be dirty blonde/brown hair, who is really smart but shy -N/A
Does Lewis structure show all electrons in an atom?
Answer:
No. It only shows valence electrons.
Answer:
A Lewis Structure is a very simplified representation of the valence shell electrons in a molecule. It is used to show how the electrons are arranged around individual atoms in a molecule. Electrons are shown as "dots" or for bonding electrons as a line between the two atoms
differentiate between short period and long period in modern periodic table
Both these contain 18 elements each. The shortest period which contains two elements, while the longest period is the 6th period which contains 32 elements.
give me the five examples of kinetic
energy
Answer:
The answer to your question is
*( Flying AirplaneWalking & RunningCyclingRollercoastersHydro-Power Plants )*What happens to the temperature of the water when it reaches its boiling point and begins to vaporize?
Answer:
Vapor pressure increases with temperature because molecular speeds are higher as temperature increases. Water boils at 100 °C because the vapor pressure exceeds atmospheric pressure at this temperature.
Explanation:
Water is put into a pot and then heated on a stove. It is then removed and allowed to cool to room temperature
Answer: here you go im pretty sure this is right i studied
Explanation:
which of the following is a pure substance choose all that apply
a}fruit juice
b}nickel
c}salt water
d}rust
Answer:
nickel and rust I think
At a pressure of 505 kPa, the volume of a gas is 12.00 mL. Assuming the temperature remains constant,
at what pressure will the new volume be 8.00 mL?
Answer:
757.5 kPa
Explanation:
Boyle's law states that p1 * v1 = p2 * v2
v1 = 12 mL
v2 = 8 mL
p1 = 505 kPA
p2 = ?
(505)(12) = (p2)(8)
6060 = (p2)(8)
p2 = 757.5
How many particles are present in this diagram?
Answer:
9 duh
Explanation:
what movie do they say rest in peace when somebody was going to sleep
Answer:
It is from the movie "Till death do us part" released in 2017 on September 29th about a worrisome couple named Michael and Madison Roland. They planned to spend the rest of their lives together, but Michael's controlling ways turn their perfect marriage into an abusive roller-coaster ride that no woman could survive. With the help of her best friend, Madison decides to get away. After adopting a new identity, she meets Alex Stone and learns to love again. All seems well until Michael discovers Madison's whereabouts and re-creates her nightmare.
Explanation:
(Heyy remember me? lol)
Cindy has lost her cell phone. She looks around everywhere and cannot find it. She decides to go to her mom and ask her to call her phone. Her mom calls it and it rings, allowing Cindy to find her phone. What type of electromagnetic wave is being used to communicate to Cindy's phone? O Visible Light O Gamma Ray O Microwave O Radio Wave
Answer:
Radio wave
Explanation:
The sound is radio waves that let Cindy find her phone.
Atoms contain nuclei with electrons orbiting
Answer:
please mark brainliest!
Explanation:
Atoms consist of a nucleus made of protons and neutrons orbited by electrons. Quarks came together to form protons and neutrons, and these particles combined into nuclei. This all took place within the first few minutes of the universe's existence, according to CERN.
9. Where does UV light
come from?
Answer:
the sun
Explanation:
can i have brainliest also have a good day
Explain what it means for energy to be conserved.
To solve this we must be knowing each and every concept related to conservation of energy. Therefore, in the below given ways we can define conservation of energy.
What is conservation of energy?Energy conservation may be defined simply as the process of consuming less energy. Energy conservation also entails changing behaviors and routines to consume less energy.
Consumers can gain from energy saving in terms of the economy and the environment. Energy conservation has several advantages for the environment, including cheaper energy prices.
Conserving energy can also help prevent the extinction of plants and animals. Start energy conservation right away if you wish to exist in a healthier and happier society.
Therefore, in the above given ways we can define conservation of energy.
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A household variety of coal is
1 point
Peat coal
Lignite coal
Bituminous coal
Anthracite coal
Answer:
Anthracite coal
Explanation:
Anthracite coal has highest amount of carbon and has clean burning properties. So, it is used as a household coal.
The amount of oxygen in the reactants is 4 atoms. In the products, the oxygen is distributed to water (H2O) and 02
gas. Which coefficients would be placed in front of water and oxygen?
O2 in front of water and 2 in front of oxygen
O 1 in front of water and 2 in front of oxygen
1 in front of water and 1 in front of oxygen
2 in front of water and 1 in front of oxygen
Answer: 2 in front of water and 1 in front of oxygen
Answer:
Your answer is D
Explanation: I'm sorry I'm late but the answer is correct
what element am i ? i have 74 protons ?
Answer:
Explanation: tungsten
The element with 74 protons is Tungsten, a chemical element.
Could y’all help me name the molecular shapes?
Explanation:
1) Carbon dioxide
2) methane
3) methanal
4) borane
5) Ozone
6) 1,1,1,1-tetrachloro methane
7) ammonia
8) water
Which waves have some electrical properties and some magnetic properties?
a. longitudinal waves
b. transverse waves
c. mechanical waves
d. electromagnetic waves
The waves which have some electrical properties, and some magnetic properties are called as electromagnetic waves. The correct answer is option d.
Electromagnetic waves are a type of wave that consists of both electric and magnetic fields oscillating perpendicular to each other and to the direction of wave propagation.
They do not require any medium to propagate and they can travel through a vacuum. These waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.
Therefore, option d. electromagnetic waves have some electrical properties and some magnetic properties.
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Please help! Sulfur is element 16. How many dots would you have to show in the electron dot diagram for sulfur?
sodium benzoate on the periodic table
Answer:
[tex]na {}^{11} 22.99[/tex]
Explanation:
oof
A chemical change happens because the particles and chemical bonds that make up the substance get rearranged. true or false
Answer:
True
Explanation:
In a chemical reaction the hydrogen bonds between the atoms in a substance break up to form a new one.
Choose all that apply.
18. Which of the following are requirements for something to be a physical property?
A. The property can be observed without changing the identity of the substance.
B. The property depends on the amount of the substance present.
C. The state of the substance changes when you measure the property.
D. The property can be observed or measured.
The property can be observed without changing the identity of the substance. The property can be observed or measured these are requirements for something to be a physical property.
What is physical properties ?Physical properties are properties of matter that can be seen and studied without influencing a sample's molecular structure. The arrangement of the material in a sample may change when a physical quality is evaluated, but the molecules' patterns are unchanged.
Melting point ,boiling point are the example of physical properties.
A property of matter that is autonomous to a change in its chemical components is termed a physical property. Density, color, hardness, melting and boiling points, and electrical conductivity are very few common examples of physical features.
Thus, option A and D are correct.
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What causes tectonic plates to move?
A. When the mantle moves, the plates move.
B. When the inner core moves, the plates move.
C. When the outer core moves, the plates move
Hello, please help me if you can :(
Answer:
4ml
Explanation: