Answer:
p=F/A.Explanation:
Helium (he) has two valence electrons, and these electrons are located in the 1s subshell. Without using the periodic table, in which group and period is helium located?.
helium is in group 8 and period 1
the Periodic Table •
Class
Key Terms
Key Terms Ch. 4
Use the clues to help you unscramble the Key Terms from the chapter. Then put the
numbered letters in order to find the answer to the riddle.
Clues
Key Terms
1. A fast-moving electron
given off by a nucleus
during radioactive decay. tbaerlpiaect
2. A term used to describe a
material that can be pounded
into shape
llbeealam
3. The process of oxygen
reacting with a metal to
form rust
4. A particle in the atomic
nucleus that carries no
charge
5. A horizontal row across the
2
rsoooiner
3
ouetnrn
periodic table
roiedp
6. Substance that can only
6
conduct electric current
under certain circumstances. otmidsceuncro
7
7. A term used to describe a
material that can be drawn
into a long wire
lecuitd
8 9
8. Radioactive isotope that can be
followed through a chemical
reaction or an industrial
process
aerrtc
9. The elements in Group 18
of the periodic table
nreti ssgea
11 12
10. The very small center core
of an atom
13
10
cuunsle
Riddle: What chart shows the repeating properties of elements?
Answer:
1 2 3 4 5 6 7 8 9 10 11 12 13
Answer:
your question too long did not read all
Explanation:
How do you find the frequency of a recorder?
Answer:
Modern recorders are most commonly pitched at A=440 Hz, but among serious amateurs and professionals, other pitch standards are often found. For the performance of baroque music, A=415 Hz is the de facto standard, while pre-Baroque music is often performed at A=440 Hz or A=466 Hz.
Explanation:
Please help me, I'm stuck and I don't know how to do it.
How many atoms are there in 7.02 g Si ?
Answer:
1.51e23 atoms
Explanation:
First, using the molar mass of Si (28.1 g/mol), determine the # of moles of Si we have. Then use Avogadro's number (6.022e23 atoms = 1 mol) to convert the # of moles to the # of Si atoms.
(7.02 g Si)([tex]\frac{1 mol}{28.1 g}[/tex]) = 0.250 mol Si
(0.250 mol Si)([tex]\frac{6.022*10^{23} atoms }{1 mol}[/tex]) = 1.51e23 atoms
The atomic mass of Silicon (Si) is 28.09 g/mol. The no. of atoms present in 7.02 g of Si is 1.46 × 10²³.
What is a mole?Any substance containing 6.022 × 10²³ atoms is called one mole of that substance. The no.of moles can be calculated by dividing the given weight by the atomic mass of the substance.
Atomic mass of Si = 28.09 g/mol
Given mass = 7.02 g.
No.of moles = 7.02 g/ 28.09 g/mol
= 0.24 moles
One mole contains 6.02 × 10²³ atoms. Thus 0.24 mole of Si contains 6.02 × 10²³ × 0.24 = 1.46 × 10²³ atoms.
Hence, no.of atoms present in 7.02 g of Si is 1.46 × 10²³ .
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Imagine a basketball filled with liquid water.Would the basketball still hold the same number of molecules? Can you use
22.4 L/mol as the molar volume for liquid water
Answer:
Yes !
Explanation:
The ball will have more molecules.
a basketball filled with liquid water. yes we use 22.4 L/mol as the molar volume for liquid water.
what are the properties of water ?Water is the chemical substance having chemical formula H2O, one molecule of water consist of two hydrogen atoms which are covalently bonded to a single oxygen atom.
The physical property of Water are, it is a colorless and tasteless liquid, have extensive hydrogen bonds resulting in unusual properties in the condensed form.
This also have high melting and boiling points. As compared to other liquids, water has a higher specific heat, thermal conductivity, surface tension, dipole moment, etc.
Water is a great solvent and helps in the transportation of ions and molecules required for metabolism, has high latent heat of vaporization helps in the regulation of body temperature.
It is Amphoteric nature can act as both acid and base means that it is amphoteric in nature, it is Electropositive elements which reduce water to hydrogen molecule and it is the source of hydrogen.
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An atom has 5 protons, 4 electrons, and 5 neutrons. Which
of the following reasons represents why this is an atom of
the element boron?
A ) The atom has 5 neutrons, just like every atom of boron
B ) The atom has 4 electrons, just like every atom of boron
C ) The atom has 14 total particles, in a combination of 5-5-4 just like every atom of boron
D ) The atom has 5 protons, just like every atom of boron
< PLEASE HELP ASAP!
Answer:
i think the answer is C
Explanation:
not sure plsss dont bash im a beginner
Answer:
B ) The atom has 4 electrons, just like every atom of boron
Explanation:
HOPE IT'S HELPwhat is the maximum concentration of salt in water for an ecosystem to be classified as a freshwater system?
Answer:
The saline water should be from 1000 ppm to 3000 ppm while fresh water is less than 1000 ppm
275 KJ of energy was transferred to water at 15c. Calculate the mass of water that can be brought to its boiling point
Answer:
need points rn sorry bro hope u get ur answer
Explanation:
Which electromagnetic wave type has frequencies higher than the violet of visible light?
Answer:
Ultraviolet means “above violet.” The electromagnetic frequencies of ultraviolet radiation (UV) extend upward from violet, the highest-frequency visible light.
hope this helps
What is an empirical formula
Answer:
a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.
Explanation:
Answer:
Meaning of Empirical formula :- A formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.Defination of Empirical formula :- The empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound. A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the empirical formula of disulfur dioxide, S₂O₂.Explanation:
Hope this helps you XD ✌️Carry on learning !!How do mixtures differ from substances?
Answer:
In chemistry: a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.
Hope this helps :)
most transition metal ions contain partially occupied ________ subshells.
4. If the speed of an object increases, its kinetic energy
stays the same
decreases
increases
Answer:
I think the answer is increases
Whether a hydrogen-based energy system is environmentally cleaner than a fossil fuel system depends on ________. the car driven governmental incentives for research the amount of fossil fuels that are invested in long-term storage the source of oxygen used for the process the source of energy used to produce the hydrogen
A hydrogen energy system is made up of hydrogen production, transportation, storage, utilization etc. Whether a hydrogen-based energy system is environmentally cleaner than a fossil fuel system depends on the source of energy used to produce the hydrogen.
Hydrogen fuel cells often makes electricity by using hydrogen and oxygen atoms. The hydrogen is said to reacts with oxygen across an electrochemical cell.Hydrogen is known to carry some amount of energy carrier and can also deliver or store a large amount of energy. Hydrogen is often used in fuel cells to generate electricity, or power and heat.
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Describe how calcium and fluorine bond together to form calcium fluoride
Answer: A transfer of electrons occurs when fluorine and calcium react to form an ionic compound. This is because calcium is in group two and so forms ions with a two positive charge. ... A pairs of shared electrons makes one covalent bond. The compound formed is known as a molecule***
What structural characteristic do all of the atoms within a group (vertical columns) have in common?
Answer:
The vertical columns (groups) of the periodic table are arranged such that all its elements have the same number of valence electrons. All elements within a certain group thus share similar properties.
hope this helps
Explanation:
Each column is called a group. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.
for each compound in the table below, decide whether there would be any hydrogen-bonding force between molecules of the compound, or between molecules of the compound and molecules of water.
Hydrogen bonding occurs between water and molecules that are polar in nature.
Even though the question is incomplete, I will try to help you to the best of my ability. Hydrogen bonding is formed when hydrogen is bonded to a highly electronegative atom.
Hydrogen bonding could occur between the molecules of a compound or between the molecules of a substance and water. Hydrogen bonding occurs between the molecules of a substances such as NH3, H2O and HF.
On the other hand, hydrogen bonding occurs between water and the compound in compounds such as CH2F2, amines, etc.
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How are mitosis and meiosis similar? How are they different? Provide 1 way the two processes are the same and 2 ways the 2 processes are different.
Answer:
Similar: both processes of cell division; both processes take place in the nucleus of the cell
Different: mitosis divides into 2, meiosis divides into 4; one is the division of body cells and the other is of specifically sex cells
Explanation:
https://byjus.com/biology/mitosis-and-meiosis/
^ this has more info!
Solutions
Which statement is true of pure substance
1. They may contain one type of atom or one type of molecules.
2.they can only contain one type of molecules.
3.they can contain different types of atoms and molecules.
4.they can only contain one type of atom
This is science btw
Answer:
4
Explanation:
cuz pure substance contain one type of atom,molecule,or cpd.
2 is true but it have wrong grammar,if it contain only one type it must be^^molecule^^
help asap for brainlist
Which statement BEST describes how many Aluminum atoms are needed when making Aluminum chloride?
Question 11 options:
1 Aluminum atom is needed because Aluminum donates one valence electron to Chlorine.
3 Aluminum atom is needed because Aluminum donates three valence electron to Chlorine.
3 Aluminum atom is needed because Aluminum accepts three valence electron from Chlorine.
2 Aluminum atom is needed because Aluminum accepts three valence electron from Chlorine.
Answer:
34 Aluminum Atoms needed to make Aluminum Chloride
Explanation:
Because through this bottom 34 atoms are subheading to make Aluminum Chloride through magnesiumWhat is the mass of 1 mol of 0 atoms to three significant figures?
Answer:
16.0 gms
Explanation:
what is the mass of 1 mole of O atoms to 3 significant figures
go to your periodic table.......O is element 8 and has an atomic mass of 15.999. to 3 significant figures, this rounds to 16.0
1 mole is the molar mass in grams
so 1 mole of O atoms has a weight of 16.0 gms
How to find the partial pressure of a gas.
Answer:
The total pressure of a mixture of gases can be defined as the sum of the pressures of each individual gas: Ptotal=P1+P2+… +Pn. + P n . The partial pressure of an individual gas is equal to the total pressure multiplied by the mole fraction of that gas.
Using diving terms, partial pressure is calculated as: partial pressure = (total absolute pressure) × (volume fraction of gas component) For the component gas "i": pi = P × F.
how can teh human body looose heat? (conduction, convecion, radiation) and WHY
Answer:
Radiation and conduction
Explanation:
The human body lose heat by these two ways, because everything that touches our bodies and is in a temperature below us will receive part of our heat (conduction), and you can figure out that we lose heat by radiation because a human bright in a heat cam
What is the theoretical yield of sodium chloride when 8.3 g of sodium is reacted with 4.5 g of chlorine? 2Na(s) + Cl2(g) → 2NaCl(s)
The theoretical yield of sodium chloride when 8.3 g of sodium react with 4.5 g of chlorine is 3.30 g
We'll begin calculating the masses of Na and Cl that reacted and the mass of NaCl produced from the balanced equation.
2Na + Cl₂ —> 2NaClMolar mass of Na = 23 g/mol
Mass of Na from the balanced equation = 2 × 23 = 46 g
Molar mass of Cl₂ = 2 × 35.5 = 71 g/mol
Mass of Cl₂ from the balanced equation = 1 × 71 = 71 g
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mass of NaCl from the balanced equation = 2 × 58.5 = 117 g
SUMMARY
From the balanced equation above,
46 g of Na reacted with 71 g of Cl₂ to produce 117 g of NaCl
Next, we shall determine the limiting reactant.From the balanced equation above,
46 g of Na reacted with 71 g of Cl₂
Therefore,
8.3 g of Na will react with = (8.3 × 71)/46 = 12.81 g of Cl₂
From the calculation made above, we can see that a higher amount (i.e 12.81 g) of Cl₂ than what was given (i.e 4.5 g) is needed to react completely with 8.3 g of Na.
Therefore, Cl₂ is the limiting reactant and Na is the excess reactant
Finally, we shall determine the theoretical yield of NaCl by using the limiting reactant (i.e Cl₂)From the balanced equation above,
71 g of Cl₂ reacted to produce 117 g of NaCl.
Therefore,
4.5 g of Cl₂ will react to produce = (4.5 × 117)/71 = 3.30 g of NaCl
Thus, the theoretical yield of NaCl produced is 3.30 g
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Answer:
The correct answer is 7.4 g NaCl
Explanation:
what is air pressure? In your own words
Answer:
The amount of force applied on an object that is moving in motion
Explanation:
una pieza de hierro de 25cm3 tiene una masa de 195g cual es su densidad?
Answer:
Pretend you are a TV producer. Think of ideas for new TV shows. Your objective is to create ideas that will be successful, regardless of whether this is quality programming or not. Think of an idea of a copy. Explain the basics of what this show will be like and what show it is copying. Explain why you feel this show will be popular. Think of an idea of a spin-off. Explain the basics of what this show will be like and what show it is spinning off from. Explain why you feel this show will be popular. Think of an idea for a TV show that falls into one of the genre categories listed in the genre chart. Describe the basics of the show and how it falls under the genre’s expectations for characters, plots, and aesthetics. Explain why you feel this show will be popular.
what is the scientific name for the layers of gas that surrounds the earth ?
a . biosphere
b . atmosphere
c . lithosphere
d . hydrosphere
PLEASEE ANSWER ILL GIVE U BRAINLYEST ASPAAAAPP
Answer:
Hey mate.....
Explanation:
This is ur answer.....
b. AtmosphereAn atmosphere is the layers of gases surrounding a planet or other celestial body. Earth's atmosphere is composed of about 78% nitrogen, 21% oxygen, and one percent other gases.
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In the reaction below the total mass of calcium in the reactants is 40. What is the total mass of calcium in the products?
Answer:
40
Explanation:
The total mass of calcium in the products is 40
What is the total mass number?The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom. Consider the table below, which shows data from the first six elements of the periodic table. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus.
How do you find the mass number?Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.
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Help help with the question below
Energy moves back and forth through the differnent ________.