Answer:
[tex]m=8.7g[/tex]
Explanation:
Hello,
In this case, it is widely known that when measurements with different significant figures are put under mathematical operations, the final result must be displayed with the same amount of significant figures of the shortest measurement, thus, due to the fact that 5.5 g has two significant figures only the result is consequently shown with two significant figures as well as shown down below:
[tex]m=5.5g+2.27g+0.8995g\\\\m=8.6695g[/tex]
By rounding the first six to seven due to the fact that the next six is greater than five, according to rounding rules, the result is:
[tex]m=8.7g[/tex]
Best regards.
Question 3. Which of these best describes the field of engineering? *
Please help
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:
QUESTION 17
If the theoretical yield of the following reaction is 3.43g of MgO and the actual yield is 2.48g of Mgo, what is the percent yield?
O 1.38%
O 72.3%
O 0.723%
138%
Answer:
72.3%
Explanation:
The following data were obtained from the question:
Theoretical yield of MgO = 3.43 g
Actual yield of MgO = 2.48g
Percentage yield of MgO =.?
Percentage yield of a reaction can simply be obtained by dividing the actual yield by the theoretical yield multiplied by 100. This is illustrated below:
Percentage yield = Actual yield /Theoretical yield × 100
Thus, we can obtain the percentage yield of MgO as follow:
Theoretical yield of MgO = 3.43 g
Actual yield of MgO = 2.48g
Percentage yield of MgO =.? Percentage yield = Actual yield /Theoretical yield × 100
Percentage yield = 2.48/3.43 × 100
Percentage yield = 72.3%
Therefore, the percentage yield of MgO is 72.3%.
Select the correct answer.
A bicycle traveled 150 meters west from point A to point B. Then it took the same route and came back to point A. It took a total of 2 minutes for
the bicycle to return to point A. What is the average speed and average velocity of the bicycle?
ОА.
The average speed is 2.5 meters/second, and the average velocity is
2.5 meters/second east.
OB
The average speed is O meters/second, and the average velocity is
2.5 meters/second east.
Ос.
The average speed and average velocity are both O meters/second.
OD. The average speed is 2.5 meters/second, and the average velocity is
O meters/second.
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
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 are the conjugate acid-base pairs in the reaction of H2SeO4 with H2O?H2SeO4+H2O→products
Answer:
Conjugate acid- H2SeO4
Conjugate base- H2O
Explanation:
The full equation of the reaction is; H2SeO4(aq) + H2O(aq)-->H3O^+( aq) + HSeO4^-(aq).
The conjugate acid is the specie that donates a proton to the conjugate base, hence H2SeO4 is the conjugate acid while H2O is the conjugate base because it accepts a proton from H2SeO4, hence the answer above.
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
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:
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.
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
What is the equation that describes the relationship of force, mass, and acceleration?
Answer:
f=ma
Explanation:
Force is measured in newtons btw
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(:
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
Ice Select one: a. is a crystal of water molecules packed in an open structure stabilized by hydrogen bonds. b. is less dense than liquid water. c. contains 17% more hydrogen bonds then water. d. all of the statements above are true. e. none of the statements above are true.
Answer:
All of the statements above are true.
Explanation:
Ice is solid water. Ice consists of an array of water molecules arranged into a crystal lattice. Ice has spaces between the water molecules so it is less dense than liquid water. Ice is about 9% less dense than liquid water. This accounts for the fact that it floats on water.
Ice contains more hydrogen bonds per water molecule when compared to liquid water.
Describe the size and scale of an atom. Explain the relative of the nucleus in relation to the size of an entire atom.
Size of an atom:
Diameter is 10^-10Size of a nucleus:
Diameter 10^-15As you can see, the nucleus is significantly smaller than the atom which is quite superb if you ask me. An atom is the smallest particle that can create a chemical composition.
Best of Luck!
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.
is Crystallizing sodium Acetate a physical or chemical change
Answer: physical please let me know if its wrong !
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
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?
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
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
Explain why mass cannot be used as a property to identify a sample of matter.
Mass is an extensive property hence it cannot be used as a property to identify a sample of matter.
The properties of matter can generally be classed into two categories;
Intensive propertiesExtensive propertiesIntensive properties of matter are those properties of matter that do not depend of the amount of matter present. In other words, they are characteristic of a particular kind of matter. Examples of such properties include, density, boiling point, etc.
Extensive properties depend on the amount of matter present. They include; mass, weight, etc.
Intensive properties serve as a sort of fingerprint that identifies a substance.
Extensive properties such as mass only measure the amount of matter in a sample and can not be used to identify a sample of matter.
Learn more: https://brainly.com/question/17889594
10. A small gold nugget has volume of 0.87 cm3. What is its mass if the density of gold is 19.3 g/cm3?
Answer:
16.791 grams
Explanation:
The density formula is:
[tex]d=\frac{m}{v}[/tex]
Rearrange the formula for m, the mass. Multiply both sides of the equation by v.
[tex]d*v=\frac{m}{v}*v[/tex]
[tex]d*v=m[/tex]
The mass of the gold nugget can be found by multiplying the density and volume. The density is 19.3 grams per cubic centimeter and the volume is 0.87 cubic centimeters.
[tex]d= 19.3 g/cm^3\\v-0.87 cm^3[/tex]
Substitute the values into the formula.
[tex]m=d*v[/tex]
[tex]m= 19.3 g/cm^3*0.87 cm^3[/tex]
Multiply. Note that the cubic centimeters, or cm³ will cancel each other out.
[tex]m=19.3 g*0.87[/tex]
[tex]m=16.791 g[/tex]
The mass of the gold nugget is 16.791 grams.
What is the mass of 5.80x10^23 atoms of silver
Answer:
5.80000000E+ 46...follow me and mark me brainliest
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
A high protein diet contains 70.0g of carbohydrates, 5.0g of Fat, and 150g of protein. How much energy, in kilocalories, and kilojoules, does each diet provide? Round answers off to tens place
Answer:
925kcal, 3870.2kJ.
Explanation:
The calorie densities of these energy sources are:
Carbohydrates: 4kcal/g
Fat: 9kcal/g
Protein: 4kcal/g
70.0g of carbohydrates are:70.0g * (4kcal/g) = 280kcal
5.0g fat * (9kcal/g) = 45kcal
150g protein * (4kcal/g) = 600kcal
The energy in kilocalories is 600+280+45 = 925kcal
As 1kcal is 4.184kJ. 925kcal are:
925kcal * (4.184kJ/1kcal) = 3870.2kJ
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 are limitations of an egg without the shell but has a very thin layer holding it all together
Answer:
As a hen ages, the eggs that she lays get gradually larger. However, the calcium content deposited in the shell remains the same despite the size of the egg. So the eggshells become thinner as the hen ages.
Explanation:
