Answer:
Valence electrons are the number of electrons in an outer shell of an atom that can participate in forming chemical bonds with other atoms.
State the number of protons, electrons and neutron
Answer:
You didn't show which element it is. The proton is the atomic number, the electron is the same number of protons, and the neutron is the atomic mass rounded to the nearest whole number minus the proton.
Explanation:
Why does a ball eventually stop bouncing? Write a three- four sentence explaination
Answer:
The ball will stop bouncing because where the starting point of the ball dropping is the most potential energy it will have. The energy decrease will cause it to bounce lower and lower by each bounce. The ball's lowered energy will cause it to stop bouncing.
Two motions of a planet are rotation and revolution. Which of the following best models rotation of a planet?
a plane circling an airport
spinning top
bee flying around a flower
car traveling on a race track
Answer:
spinning top is the answer
write any two differences between autotrophs and heterotrophs . subject-science
Answer:
Autotrophs are organisms that prepare their own food through the process of photosynthesis, whereas heterotrophs are organisms that cannot prepare their own food and depend upon autotrophs for nutrition.
Explanation:
Btw I searched this up found it on a website called byjus.com. Hope this helps!
Hydrogen gas is produced when we
metal with hydrochloric acid:
react magnesium
Mg(s) + 2 HCI(aq) - MgCl(aq) + H2(g) 7z
(a) If 4.50 g of hydrogen gas is collected at STP, what
volume of hydrogen does
this represent?
(b) If 0.52 mol of magnesium completely reacted, what
amount of hydrogen gas (in moles) would be produced
at STP? How many grams of hydrogen iS this?
Magnesium is a metal that reacts quickly. The reaction with hydrochloric acid will result in the production of magnesium chloride and hydrogen gas.
How much hydrogen is generated by the reaction at STP?Molecules, pressure, and temperature were necessary to determine the gas's volume. We only need to determine the moles of hydrogen because temperature and pressure have already been provided. As a result, 16.8 L of hydrogen were created at STP by dissolving 13.5 g of aluminum in sulfuric acid.
How much hydrochloric acid must be present for 0.50 mol of magnesium to react?The chemistry is described below. According to the aforementioned reaction, 1 mole of magnesium and 2 moles of HCl are involved. The HCl moles are therefore 20.50mol=1mol 2 0.50 m o.
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8. Jill conducted an experiment to investigate which plant food would make her
plants grow faster. She tried four different plant foods on plants of the same
type and age. Jill concluded that the plant that was fed Brand A grew the
fastest. Jill did not realize that the plant that was fed Brand A also received
more sunlight. (SC.7.N.1.5.3)
What error did Jill make in her experiment?
a) She used the wrong kind of plant.
b) She used too much plant food.
c) She did not control the variables.
3. Which body system protects the inside of our body and regulates our body temperature?
Answer:
integumentary system
Explanation:
The integumentary system reduces water loss, contains receptors that respond to touch, regulates body temperature, and protects the inside of the body from damage. Receptors in skin send sensory information to the brain.
Answer:
Integumentary system
Explanation:
The integumentary system is the largest organ of the body, equaling 15-20% of our total body mass. It acts as a barrier to physical, chemical, and biological agents. The skin prevents water loss and regulates body temperature
Assume there exists some hypothetical metal that exhibits ferromagnetic behavior and that has (1) a simple cubic crystal structure, (2) an atomic radius of 0.126 nm, and (3) a saturation flux density of 0.69 tesla. Determine the number of Bohr magnetons per atom for this material. Part 1 Correct answer icon Excellent! What is the volume, in m3, for this unit cell
Answer:
[tex]n_b=0.947 Bohr\ magnetons/atom[/tex]
Explanation:
From the question we are told that:
Atomic radius [tex]r=0.126 nm[/tex]
Saturation flux density [tex]B= 0.69 T[/tex]
Generally the equation for number of Bohr magnetons per atom is mathematically given by
[tex]n_b=\frac{B_s*Vc}{\mu_0*\mu_b}[/tex]
Where
[tex]\mu_0=Magnetic\ permeability[/tex]
[tex]\mu_0=1.257 * 10^{-6}[/tex]
[tex]\mu_b=Magnetic\ Moment\ of\ an\ Atom[/tex]
[tex]\mu_b=9.27* 10^{-24}[/tex]
[tex]Vc=d^3[/tex]
[tex]Vc=(2(0.126*10^-9))^3[/tex]
[tex]Vc=1.6*10^{-29}[/tex]
Therefore the number of Bohr magnetons per atom for this material
[tex]n_b=\frac{0.69*1.6*10^{-29}}{1.257 * 10^{-6}*9.27* 10^{-24}}[/tex]
[tex]n_b=0.947 Bohr\ magnetons/atom[/tex]
The largest use of oil is for:
air conditioning
gasoline
heat
lubricants
Answer:
Lubricants
Explanation:
oil is slick, allowing it to aid in the movement of machinery
How many moles are in 4.25 g of C12H22011?
pls help ASAP!
Answer:
molecular weight of C12H22O11 or grams This compound is also known as Lactose or Sucrose or Maltose. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles C12H22O11, or 342.29648 grams.
Explanation:
HELP ME PLEASE!! ASAP
(4) 3- ethyl -2,5 dimethyl -1,4 -hexadiene
Perform the following operation
and express the answer in
scientific notation.
2.600x10-5 x 6.100x10-5
[? ]x10?)
Answer:
Value of expressions in scientific notation = 15.86 x 10⁻¹⁰
Explanation:
Given expressions:
2.600 x 10⁻⁵ x 6.100 x 10⁻⁵
Find:
Value of expressions in scientific notation
Computation:
2.600 x 10⁻⁵ x 6.100 x 10⁻⁵
2.600 x 6.100 x 10⁻⁵x 10⁻⁵
15.86 x 10⁻⁵ x 10⁻⁵
We know that;
qᵃ x qᵇ = q⁽ᵃ⁺ᵇ⁾
So,
15.86 x 10⁽⁻⁵⁻⁵⁾
15.86 x 10⁽⁻¹⁰⁾
Value of expressions in scientific notation = 15.86 x 10⁻¹⁰
what amount of oxygen gas in moles contains 1.8x10^22 molecules?
Answer:
0.03 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{1.8 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.02990...[/tex]
We have the final answer as
0.03 molesHope this helps you
Helen knit a total of 175 centimeters of scarf over 35 nights. How many nights will Helen have to spend knitting in order to knit a total of 180 centimeters of scarf? Solve using unit rates.
Helen takes 35 nights to knit a total of 175 centimeters of scarf. Hence, she will take 36 nights to knit 180 centimeters of scarf.
What are length units?Length is a basic measurement in for an object which is basically taken in meters or centimeters. The basic unit of length in American standard is meters (m) and in CGS system it is centimeters.
It is given that, Helen knit a total of 175 centimeters of a scarf over 35 nights. Then, the length she knit in one nigh is calculated as:
175/35 = 5 cm.
Therefore, the number of nights required to complete 180 cm is :
180 /5 = 36
Thus, she will take 36 nights to knit a total of 180 cm of scarf.
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Starch is a natural polymer composed of
Answer:
Starch is a natural polymer composed of glucose molecules.
Explanation:
Monke demands points.
State Faraday's 2nd law of electrolysis
Answer:
[tex]{\huge\red{\fbox{{Faraday's 2nd Law of Electrolysis :-}}}}[/tex]
According to the second law of electrolysis, the same quantity of electricity will produce or dissolve chemically equivalent amounts of all the substances. This quantity of electricity is called Faraday (F). One Faraday is equal to 96487 coulombs per mole of electronic charges.
A barrel of crude oil has a volume of 42 gallons, only approximately 45% of which is processed into gasoline. If your car achieves 37 mi/gal, and you drive 36,000 miles in one year, how many barrels of crude oil are required to run your car for a year?
A solution was prepared by dissolving 105.0 g of KCl in 215 g of water.
What is the molality (in m) of KCl in this solution?
(Round your answer to TWO places past the decimal)
Considering the definition of molality, the molality of the KCl in the solution is 6.56 moles/kg.
Definition of molalityMolality, or molal concentration, is the amount of a substance dissolved in a given mass of solvent. It is defined as the moles of a solute per kilogram of solvent.
The Molality of a solution is determined by the expression:
molality= number of moles of solute÷ kilograms of solvent
Molality in this caseIn this case, you know:
mass of KCl= 105 gmass molar of KCl= 74.55 g/molenumber of moles of solute= mass of KCl÷ mass molar of KCl= 105 g÷ 74.55 g/mole= 1.41 molesMass of solvent = 215 g of water= 0.215 kg (being 1000 g=1 kg)Replacing in the definition of molality:
Molality= 1.41 moles÷ 0.215 kg
Molality= 6.56 moles/kg
The molality of the solution is 6.56 moles/kg.
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What would indicate that a physical change takes place when cooper is drawn into wire
Answer:
When a copper is drawn into wire the only change that occurs is change in its shape and size no change will take place into its composition that is the wires are still possessing the properties of copper metal. Thus, a physical change takes place when copper is drawn into wire.
Given: Mg3N2 + 3 K2O → 3 MgO + 2 K3N
How many moles of magnesium nitride, Mg3N2 is needed to react to produce 11.6 grams of MgO? Show work
Answer:
0.11
Explanation:
This equation is not balanced because there is an unequal amount of O's on both sides of the equation. The left hand side has 4 P's and the right hand side has 4 P's. So the P atoms are balanced. The left hand side has 2 O's and the right hand side has 10 O's.
To fix this unbalanced equation a 5 in front of the O2 on the left hand side is added to make 10 O's on both sides resulting in
P4 + 5O2 = 2P2O5
The equation is now balanced because there is an equal amount of substances on the left and the right hand side of the equation.
Answer ASAP Pls don't use links
Questions:
Answer the following on your answer sheet.
1. What will happen if you use a triangle with a steeper inclination?
2. What will happen if the triangle has a less steep inclination?
3. How will the new and old screws be compared?
Answer:
3 The Shank and the Threads
What information does an equilibrium constant give about a reaction?
O A. It tells how long it takes the reaction to reach equilibrium.
B. It tells whether products or reactants are favored at equilibrium.
C. It tells how much energy is required for the reaction to happen.
O D. It tells what the rate constant of the reaction is at equilibrium.
Answer:
B. It tells whether products or reactants are favored at equilibrium.
5. True or False: If one thing in a food web is affected, it will only probably affect the organism that directly relies on it for energy. *
1 point
A. True
B. False
Cli scipattern of by
a.
inceag dryn
b.
increasinnd Midwest.
Answer:
the answer is A don't put b Coz b is incorrect
What is bungee gum made of? A) The properties of both rubber and gum. B) Bungee cord and gum.
Answer:
The proporties of both rubber and gum.
Explanation:
Need help on this one
Answer:
Explanation:convection
A transverse wave is shown here. Several wave properties are labeled with letters. Which of these statements accurately reflects the energy associated with the wave? Select ALL that apply. Responses A Y is the frequency, and an increase in Y is associated with an increase in energy.Y is the frequency, and an increase in Y is associated with an increase in energy. B W is the amplitude, and a decrease in W is associated with an increase in energy.W is the amplitude, and a decrease in W is associated with an increase in energy. C W is the amplitude, and an increase in W is associated with an increase in energy.W is the amplitude, and an increase in W is associated with an increase in energy. D Z is the displacement, and a decrease in Z is associated with an increase in energy.Z is the displacement, and a decrease in Z is associated with an increase in energy. E X is wavelength, and a decrease in X is associated with an increase in energy.
Answer:
C) W is the amplitude, and an increase in W is associated with an increase in energy.
E) X is wavelength, and a decrease in X is associated with an increase in energy.
Explanation:
A transverse wave consists of an oscillating electric field that is perpendicular to the direction of the wave. Increasing either the amplitude or the wavelength of the wave increases its energy. For a transverse wave, the amplitude corresponds to W, while the wavelength is labeled X. So increasing W or decreasing X will create increase the energy of the wave.
True or False: Salt will freeze with water molecules.
Answer:
True
Explanation:
Salt is used to keep ice from forming but it only helps with certain tempuratures is still able to freeze
Answer:
yes it is true have a great time
How many grams of CO are needed to produce 209.7 g Fe?
Fe2O3+3CO⟶3CO2+2Fe
Answer:
157.8 g
Explanation:
Step 1: Write the balanced equation
Fe₂O₃ + 3 CO ⟶ 3 CO₂ + 2 Fe
Step 2: Calculate the moles corresponding to 209.7 g of Fe
The molar mass of Fe is 55.85 g/mol
209.7 g × 1 mol/55.85 g = 3.755 mol
Step 3: Calculate the moles of CO needed to produce 3.755 moles of Fe
The molar ratio of CO to Fe is 3:2. The moles of CO needed are 3/2 × 3.755 = 5.633 mol
Step 4: Calculate the mass corresponding to 5.633 moles of CO
The molar mass of CO is 28.01 g/mol.
5.633 mol × 28.01 g/mol = 157.8 g
Consider the unbalanced reaction Ti(s) + Cl2(g) --> TiCl4(s). When 4.21 g of Ti react with 15.4 g of Cl2, 16.2 g of CCl4 are obtained. The theoretical yield of TiCl4 is ___, the limiting reactant is ____ and the percent yield is ____.
Answer:
Theoretical yield: 16.68g Limiting reactant: Ti %yield=97.12%
Explanation:
Balanced reaction : Ti(s) +2 Cl2 (g) -> TiCl4(s)
g of substance = # of mole x molar mass
# of mole= g of substance/molar mass
%yield= actual yield x100/ theoretical yield
Ti is limiting reactant since it has the smallest amount of moles- 0.08795 causing it to run out first