Answer:
8.5
Explanation:
Took the test and got it correct
On an average, teenagers require 8.5 hours of sleep each night to maintain good health.
Who are teenagers?
A teenager, or teen, is someone who is between 13 and 19 years of age. They are called teenagers because the number of their age contains the suffix "teen". The word "teenager" is often associated with adolescence. Most neurologists consider the brain still developing into a person's early or mid-20s. A person becomes a teenager when they become 13 years old. It ends when they turn 20 years old. Teenagers who are between 13 and 17 years old are considered both children and teenagers in most countries. Teenagers who are 18 and 19 years old may be regarded as both teenagers and adults.
The way the word is used varies. Most societies have rites of passage to mark the change from childhood to adulthood. These ceremonies may be quite elaborate.During puberty, rapid mental and physical development occurs. Adolescence is the name for this transition period from childhood to adulthood.
Learn more about teenagers,here:
https://brainly.com/question/3235532
#SPJ2
What is the equation that describes the relationship of force, mass, and acceleration?
Answer:
f=ma
Explanation:
Force is measured in newtons btw
What volume of solution is prepared when 25.0 g of ethanol (C2H5OH) is added to enough water to make a 0.750 M ethanol solution?
Answer:
0.724 L
Explanation:
Step 1: Given data
Mass of ethanol (solute): 25.0 g
Concentration of the solution: 0.750 M
Step 2: Calculate the moles corresponding to 25.0 g of ethanol
The molar mass of ethanol is 46.07 g/mol.
25.0 g × (1 mol/46.07 g) = 0.543 mol
Step 3: Calculate the volume of the solution
We will use the following expression.
M = moles of solute / liters of solution
liters of solution = moles of solute / M
liters of solution = 0.543 mol / (0.750 mol/L)
liters of solution = 0.724 L
in physics matter has three fundamental states gas solid and???
Liquid (Matter can exist in one of three main states: solid, liquid, or gas.)
The only metal that exists as a liquid at room temperature is
Answer:
Mercury
Explanation:
This is the only metal that exists as a liquid at room temperature
Cylinders of compressed gas are typically filled to a pressure of 200 bar. For oxygen, what would be the molar volume at this pressure and 25 °C based on (i) the perfect gas equation, (ii) the van der Waals equation? For oxygen, a = 1.364 dm6 atm mol−2, b = 3.19 × 10−2 dm3 mol−1.
Answer:
a
[tex]V = 0.124 \ Liters[/tex]
b
[tex]V = 0.112 \ Liters[/tex]
Explanation:
From the question we are told that
The pressure of compressed gas is [tex]P = 200 \ bar = \frac{200}{1.013}= 197.4 \ atm[/tex]
The temperature is [tex]T = 25^oC = 25 + 273 = 298 \ K [/tex]
Generally the perfect gas equation is mathematically represented as
[tex]PV = nRT[/tex]
substituting 0.08206 L-atm/mol-K for R and 1 mole for n
We have that
[tex]V = \frac{1 * 0.08206 * 298 }{ 197.4}[/tex]
[tex]V = 0.124 \ Liters[/tex]
Generally the van der Waals equation is mathematically represented as
[tex]nRT = [P + \frac{n^2 * a }{V^2 } ][V - nb][/tex]
=>[tex]1 * 0.08206 *298 = [197.4 + \frac{1^2 * 1.364}{V^2 } ][V - 1 * 3.19 * 10^{-2}][/tex]
=> [tex]V = 0.112 \ Liters[/tex]
What makes up nearly all of the atom's mass?
A. The sum of all protons and neutrons
B. The sum of all neutrons and electrons
C. The sum of all protons and electrons
D. The sum of all isotopes
SUBMIT
Answer:
a. the sum of all protons and neutrons
Use the arrangement of particles in solids and gases to explain why solids are not as easy to compress as gases.
Answer:
The strong forces of attraction between the particles stop the particles from moving around each other and making the solid flow. The particles are close together so they need to be compressed hard to get them closer.
Explanation:
In solids, strong forces of attraction holds the particles together in a three-dimensional structure. The particles form an orderly arrangements called Lattice.
1/2-life of pyruvic acid in the presence of aminotransferase enzyme (which converts it to alanine) was found to be 221 s. how long will it take for the concentration of pyruvic acid to fall to 1/64 of its initial value in this first order reaction?
Answer:
After 1326s, the concentration of pyruvic acid fall to 1/64 of its initial concentration.
Explanation:
The first order kinetics reaction is:
ln [A] = ln [A]₀ - kt
Where [A] is concentration after t time, [A]₀ is intial concentration and k is reaction constant.
To convert half-life to k you must use:
t(1/2) = ln 2 / K
221s = ln 2 / K
K = ln 2 / 221s
K = 3.1364x10⁻³s⁻¹If [A] = 1/64, [A]₀ = 1:
ln [A] = ln [A]₀ - kt
ln (1/64) = ln 1 - 3.1364x10⁻³t
4.1588 = 3.1364x10⁻³s⁻¹t
1326s = t
After 1326s, the concentration of pyruvic acid fall to 1/64 of its initial concentration.
The time takes for the concentration of pyruvic acid to fall to 1/64 of its initial value in this first order reaction 1326s.
How we calculate time?Time will be calculated by using the first order kinetics equation as:
ln [A] = ln [A]₀ - kt, where
[A] = final concentration = 1/64
[A]₀ = initial concentration = 1
t = required time
k is the rate constant and will be calculated by using the half life duration 221s as:
t(1/2) = ln2 / k
221s = ln2 / k
k = ln2 / 221s = 3.1364x10⁻³ per sec
Now putting all these values on the above equation, we get
ln (1/64) = ln 1 - 3.1364x10⁻³t
4.1588 = 3.1364x10⁻³s⁻¹t
1326s = t
Hence, required time is 1326s.
To know more about first order reaction, visit the below link:
https://brainly.com/question/518682
Most people use the _____ for intercity travel
Answer:
The person at the top said the right answer I checked
what is the name of the element that has electrons arranged
2,8,2
Answer:
The metal element → Magnesium (Mg)
Answer:
magnesium
Explanation:
magnesium has electrons arranged 2,8,2
Which one of the following combinations cannot function as a buffer solution?
A) HCN and KCN
B) NH3 and (NH4)2SO4
C) HNO3 and NaNO3
D) HF and NAF
E) HNO2 and NaNO2
Answer:
it is B
; )
Which one of the following combinations cannot function as a buffer solution?
A) HCN and KCN
B) NH3 and (NH4)2SO4
C) HNO3 and NaNO3
D) HF and NAF
E) HNO2 and NaNO2
What mainly inspired the Europeans to travel the ocean
1)colonization
2)trade
3)spread christianity
4)slavery
Based upon the structures of acetylsalicylic acid, acetaminophen, and caffeine, including their functional groups and overall polarity, which best explains why ethanol is likely responsible for the fact that ASA and APHEN elute first in this solvent?
Answerb
Explanation:because I got it right
True or False:
Because the length, width and height of a cube are both
extensive properties, the volume of the cube is also an
extensive property.
Answer:
true
Explanation:
what is The pH and pOH of a 1.00x10-3M solution of CH3COOH (Ka=1.75x10-5) ?
Answer:
pH = 3.9pOH = 10.1Explanation:
Since [tex]CH _ 3COOH[/tex] is a weak acid to find the pH of [tex]CH _ 3COOH[/tex] we use the formula
[tex]pH = - \frac{1}{2} log(Ka) - \frac{1}{2} log(c) [/tex]
where
Ka is the acid dissociation constant
c is the concentration
From the question
Ka of [tex]CH _ 3COOH[/tex] = 1.75 × 10^-5
c = 1.00 × 10-³M
Substitute the values into the above formula and solve for the pH
That's
[tex]pH = \frac{1}{2} ( - log(1.75 \times {10 }^{ - 5} - log(1.00 \times {10}^{ - 3} ) ) \\ = \frac{1}{2} (4.757 + 3) \\ = \frac{1}{2} \times 7.757) \\ = 3.8785 \: \: \: \: \: \: \: \: [/tex]
We have the answer as
pH = 3.9To find the pOH we use the formula
pH + pOH = 14
pOH = 14 - pH
pOH = 14 - 3.9
We have the answer as
pOH = 10.1Hope this helps you
What is a relief in relation to topography ?
Answer:
Relief is typically defined as the difference in height between the high point and the low point on a landscape, in feet or in meters.
Explanation:
Answer:
Relief is the difference in elevation between two points. It is easily calculated by subtracting the lowest elevation from the highest elevation in an area.
Explanation:
Mark me brainly please(:
Calculate the net force that thymine exerts on adenine. To keep the calculations fairly simple, yet reasonable, consider only the forces due to the O−H−N O − H − N and the N−H−N N − H − N combinations, assuming that these two combinations are parallel to each other. Remember, however, that in the O−H−N O − H − N set, the O− O − exerts a force on both the H+ H + and the N− N − , and likewise along the N−H−N N − H − N set.
Answer:
hello your question is incomplete and lacks the required figure below is the missing part
The two sides of the DNA double helix are connected by pairs of bases (adenine, thymine, cytosine, and guanine). Because of the geometric shape of these molecules, adenine bonds with thymine and cytosine bonds with guanine shows the thymine adenine bond. Each charge shown is ±e, and the H−N distance is 0.110 nm
answer : net force due to O-H-N combination = -5.03354 * 10^-9 N
net force due to N-H-N combination = -3.822 * 10^-9 N
net force that the thymine exerts on adenine = -8.8558 * 10^-9 N
Explanation:
considering only the forces due to O-H-N and N-H-N to determine the net force been exerted on adenine by thymine
we have to make some assumptions
we have to assume force towards thymine to be negative
Net force that thymine exerts on Adenine
= net force due to 0-H-N + net force due to N-H-N
= ( -5.03354 * 10^-9 ) + ( - 3.822 * 10 ^-9 )
= -8.8558 * 10 ^-9 N
ATTACHED BELOW IS THE REMAINING PART OF THE SOLUTION
Which Of The Following Monosaccharides Is Not An Aldose? A) Crythrose B) Fructose C) Glucose D) Glyceraldehyde E) Iribose
Fructose monosaccharides is not an aldose sugar. Hence option B is correct.
What is Monosaccharide?Monosaccharide is a simplest form of sugar that is not decompose in simple sugars by hydrolysis and it contains one or more hydroxyl groups.
Types of sugars – Aldose and ketose (which are named on the basis of presence of functional groups aldehyde and ketone).
Aldose is a monosaccharide contains carbon chain with carbonyl group in endmost carbon atom.
Erythrose, glucose, glyceraldehyde and ribose contain aldehyde as a functional group so these are example of aldose where as fructose contains a ketone group so it is a ketose not an aldose.
Fructose monosaccharides is not an aldose sugar. Hence option B is correct.
Learn more about Monosaccharide, here:
https://brainly.com/question/780562
#SPJ6
If you start a chemical reaction with 38 grams of reactants, how many grams of a product would
you end up with?
Your answer:
Answer:
38 g as well due to the law of conservation of mass.
Explanation:
Hello,
In this case, we need to review the law of conservation of mass which states that matter cannot be neither created nor destroyed, thus, for chemical reactions, the mass of reactants at the beginning of the chemical reaction must equal the mass of products at the end in closed systems, that is why, since 38 g is the mass of reactants, the mass of the overall products is also 38 g.
Best regards.
What is the difference between an element and a compound?
A. An element is a pure substance, a compound is a mixture.
B. An element is more than one type of atom, a compound is a single type of atom.
C. An element is one type of atom, a compound is more than one type in mixed composition.
D. An element is one type of atom, a compound is more than one type bonded together.
What is the purpose of Oxidation?
if you add sugar to water and the sugar no longer dissolves and it settles at the bottom the solution has become
Answer:
It forms a solution.
Explanation:
A pure substance is when only one type of atom or molecule is present. In this case the substance contains two different molecules; sugar and water, assuming sugar is all one type (e.g. glucose) and there are no contaminants in the water or sugar before combining the two.
Dissolving the sugar in the water makes a homogeneous mixture and once dissolved a solution is made by the combination of a solute (sugar) and solvent (water).
Hope this helps!!!!
is Crystallizing sodium Acetate a physical or chemical change
Answer: physical please let me know if its wrong !
Heptane and water do not mix, and heptane has a lower density (0.684 g/mL) than water (1.00 g/mL). A 100-mL graduated cylinder with an inside diameter of 3.16 cm contains 34.6 g of heptane and 34.0 g of water. What is the combined height of the two liquid layers in the cylinder? The volume of a cylinder is π r2h, where r is the radius and h is the height.
Answer:
[tex]h=100.8cm[/tex]
Explanation:
Hello,
In this case, considering the density and mass of both water and heptane we first compute the volume of each one:
[tex]V_{water}=\frac{m_{water}}{\rho _{water}}=\frac{34g}{1.00g/mL}=34mL\\ \\V_{heptane}=\frac{m_{heptane}}{\rho _{heptane}}=\frac{34.6g}{0.684g/mL}=50.6mL\\[/tex]
Now, the total volume is:
[tex]V=50.6mL+34mL=84.6mL[/tex]
Which is equal to:
[tex]V=84.6cm^3[/tex]
Then, by knowing that the volume of a cylinder is πr²h or π(D/2)²h, we solve for the height as follows:
[tex]h=\frac{V}{\pi (D/2)^2} \\\\h=\frac{84.6cm^3}{\pi (3.16cm/2)^2} \\\\h=100.8cm[/tex]
Best regards.
Draw the structure of aspirin acid and conjugate base.
Answer:
Aspirin = acetylsalicyclic acid
Its conjugate base = acetylsalicyclate
Note: See the attachment below for structures.
Explanation:
Aspirin, also known as acetylsalicyclic acid is derived from the acetylation of salicyclic acid at carbon-2. It is used as a medication in the treatment of pain, fever and inflammation.
It is grouped under the class of non-steroidal anti-inflammatory drugs (NSAIDs), which are a class of drugs that in addition to anti-inflammatory actions, have analgesic, antipyretic, and platelet-inhibitory actions.
Its conjugate base, acetylsalicyclate is obtained from the deprotonation of the carboxylic acid group, -COOH.
why are there so many ads
Skepticism _____. means not having an open mind is the belief that knowledge is not certain is a quality scientists should not have keeps scientists from making new discoveries
Answer:
(C) is the belief that knowledge is not certain.
Explanation: I would say it’s (C) because Most scientist or empirical skeptic is one who questions beliefs on the basis of scientific understanding and empirical evidence. Scientific skepticism may discard beliefs pertaining to purported phenomena not subject to reliable observation and thus not systematic or testable empirically.
Answer:
(C) is the belief that knowledge is not certain.
Explanation:
A 3.31-g sample of lead nitrate, Pb(NO3)2, molar mass = 331 g/mol, is heated in an evacuated cylinder with a volume of 2.53 L. The salt decomposes when heated, according to the equation:
2Pb(NO3)2(s)-->2PbO(s) + 4NO2(g) + O2(g)
Assuming complete decomposition, what is the pressure in the cylinder after decomposition and cooling to a temperature of 300. K? Assume the PbO(s) takes up negligible volume.
Answer:
0.486atm is the pressure of the cylinder
Explanation:
1 mole of Pb(NO₃)₂ descomposes in 4 moles of NO2 and 1 mole of O2. That is 1 mole descomposes in 5 moles of gas.
To find the pressure of the cylinder, we need to find moles of gas produced, and using general gas law we can determine the pressure of the gas:
Moles Pb(NO₃)₂ and moles of gas:
3.31g * (1mol / 331g) = 0.01 moles of Pb(NO₃)₂.
That means moles of gas produced is 0.05 moles.
Pressure of the gas:
Using PV = nRT
P = nRT/V
Where P is pressure (Incognite)
V is volume (2.53L)
R is gas constant (0.082atmL/molK)
T is absolute temperature (300K)
And n are moles of gas (0.05 moles)
P = 0.05mol*0.082atmL/molK*300K / 2.53L
P = 0.486atm is the pressure of the cylinder
What is the mass of 5.80x10^23 atoms of silver
Answer:
5.80000000E+ 46...follow me and mark me brainliest
Compare the components that make up the windsurfer, his board, and his surroundings.
Answer:
The windsurfer, his board, and the air and water around him are all made of matter. That matter is made up of very small particles called atoms.
Explanation:
The windsurfer, the board, and the surroundings are all components involved in the activity of windsurfing. Let's compare them:
1. Windsurfer: The windsurfer is the person engaging in the sport. They are responsible for controlling the board and maneuvering through the water using the sail. The windsurfer's skills, balance, and physical abilities play a crucial role in their performance.
2. Board: The windsurfing board is the equipment used by the windsurfer. It typically consists of a long, narrow board with a fin at the bottom for stability and control. The board is designed to float on the water and provide a platform for the windsurfer to stand on.
3. Surroundings: The surroundings refer to the environment in which windsurfing takes place, which is usually a body of water such as a lake, river, or ocean. The condition of the water, including its temperature, depth, and currents, can affect the windsurfer's experience and performance.
In summary, the windsurfer, the board, and the surroundings are interconnected components of the windsurfing experience.
The skills and physical abilities of the windsurfer, the design and performance of the board, and the characteristics of the surrounding environment all contribute to the overall enjoyment and success of the activity.
Know more about windsurfing:
https://brainly.com/question/30063768
#SPJ2
