Answer:
Option A is correct: You have three times the number of particles that are in 12 grams of carbon-12
Explanation:
Data given:
3 moles of substance equal to how many particles of 12 g of carbon-12.
Solution:
First we find the number of particles in 3 moles of substance
Formula used
no. of moles = no. of particles / Avogadro's number
Rearrange the above formula
no. of particles = no. of moles x Avogadro's number . . . . . . . . (1)
Where
Avogadro's number = 6.022 x 10²³
Put values in above equation
no. of particles = 3 x 6.022 x 10²³ (particles/mol)
no. of particles = 1.8066 x 10²⁴ Particles
So,
3 mole of substance have 1.8066 x 10²⁴ Particles
Now
we have to find number of particles in 12 g of carbon-12
for this first find no. of moles
formula used
no. of moles = mass in grams/ molar mass . . . . . (2)
molar mass of carbon = 12 g/mol
Put values in equation 2
no. of moles = 12 g / 12 (g/mol)
no. of moles = 1 mole
So,
12 g of carbon 12 equal to 1 mole.
According to Avogadro's law 1 mole of any substance consists of 6.022 x 10²³ number of particles.
So
1 mole carbon = 6.022 x 10²³ particles
and 3 mole of substance = 1.8066 x 10²⁴ Particles
It means that we have three times number of particles that are in 12 g of carbon-2
So, Option A is correct.
A. You have three times the number of particles that are in 12 grams of carbon-12.
wyatt solved the following equation: x+1/2(6x-4)=6 which of the following has all correct justifications wyatt used to siove this equation
Explanation of how Wyatt solved the equation x + 1/2(6x - 4) = 6 and verified the solutions.
Wyatt solved the equation x + 1/2(6x - 4) = 6 by simplifying and solving for x, resulting in x = 3, x = -7. To verify the solutions, each value was substituted back into the original equation to ensure they satisfy the equation, leading to an identity.
Use the drop down menus to answer the questions,
In what type of plate boundary did subduction occur? Convergent boundary
In what type of plate boundary did new crust form? Convergent boundary
In what type of plate boundary did mountains form? Convergent boundary v
In what type of plate boundary did volcanoes form?
In what type of plate boundary did a river change its path?
Answer:
1, convergent boundary
2,divergent boundary
3, convergent boundary
4, convergent boundary
5,transform boundary
Explanation:
Convergent boundaries where two plates are colliding with each other.
What is Convergent and divergent boundaries?
Convergent boundaries where two plates are colliding. At subduction zones, the denser plate is subducted underneath the less dense plate. The plate being forced under is melted.
When two plates are moving away from each other, it is known as divergent plate boundary. Most divergent plate boundaries are formed underwater and formed oceanic spreading ridges.
Mountains are formed at convergent plate boundaries. At convergent boundary at which two plates are moving towards one another.
Destructive or convergent plate boundaries at which the tectonic plates are moving towards each other. Volcanoes form at convergent plate boundaries.
When plates move apart from each other at divergent boundaries, magma from the mantle reaches to the surface of Earth and new crust forms. When plates move toward each other at convergent boundaries, volcanoes, mountains, and trenches formed.
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Acetone is the main chemical in nail polish and has a density of 0.7857 g/mL. What is the volume of 6.54g of acetone ?
8.3mL
Explanation:
Given parameters:
Mass of acetone = 6.54g
Density of acetone = 0.7857 g/mL
Unknown:
Volume of acetone = ?
Solution:
Density is defined as the mass per unit volume of a substance. It is expressed mathematically as shown below:
Density = [tex]\frac{Mass}{Volume}[/tex]
Since the unknown is volume, we make it the subject of the formula
Volume = [tex]\frac{mass}{density}[/tex]
Input the values;
Volume = [tex]\frac{6.54}{0.7857}[/tex] = 8.3mL
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8) What would the formula of di-iodine pentasulfide be?
The formula for di-iodine pentasulfide would be I2S5.
Two (di) molecules of iodine, paired with five (penta) molecules of sulfur.
UCULO
2 Points
Which of the following is a cost of urban development?
O
A. Loss of agricultural land
O
B. Employment
O
C. Efficient distribution of goods
O
D. Entertainment
Answer:
A. Loss of agricultural land
Explanation:
Urban development pretty much encourages the other three answers' development
Answer: it would A the loss of agriculture land
Which situation is an indication that a chemical change has occurred?
A.No heat is released.
B.A gas is formed.
C.No color change occurs.
D.The temperature does not change.
Answer:
A. Heat is Released.
(Both physical and chemical changes can tamper with temperature, but to identify a CHEMICAL change - you'll notice a color change, heat being released, odor and/or bubbling.)
The only thing listed applicable is Heat is Released.
Explanation:
Answer:
B. A gas is formed
Ik I'm late sorry
Explanation:
I did the test :P
According to the law of conservation of mass, mass is neither created nor destroyed in any ordinary chemical reaction. Which of the following is a demonstration of this law?
Answer: When carbon dioxide breaks down into carbon and oxygen, the number of atoms always remains the same.
Explanation: I know this is late but for other people that are trying to find the answer their it is, I hope this helps
The observation which demonstrates the mass conservation is option C. When water breaks down into hydrogen and oxygen, the number of atoms always remains the same.
What is mass conservation ?
Conservation of mass is alike the conservation of energy. That is mass can neither be created nor be destroyed. Therefore, the total mass of a system remains constant always.
In a chemical reaction, the total mass in the reactant side is always equal to the total mass in the product side. Hence, no new atoms are created or already existing atoms do not destroy.
In the decomposition of water, the number of atoms in the product side is equal to that in the reactant side. Hence, the total mass of water broken is equal to the total mass of hydrogen and oxygen.
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Your question is incomplete. But your complete question is as follows;
According to the law of conservation of mass, mass is neither created nor destroyed in any ordinary chemical reaction. Which of the following is a demonstration of this law?
When hydrogen and oxygen combine to make water, oxygen atoms are converted to hydrogen atoms.
When sodium and chlorine combine to make salt, some of the sodium is always lost.
When water breaks down into hydrogen and oxygen, the number of atoms always remains the same.
When iron reacts with oxygen to form rust, the mass of the iron atoms increases.
What is the balanced chemical equation for the reaction between Hydrochloride acid and calcium carbonate when the products of the reaction are calcium chloride Carbon Dioxide and water
Answer: 2HCl + CaCO3 => CaCl2+ CO2 + H2O
Explanation:
The equation is now balanced.
2 atoms H in both reactant and product side.
Cl have 2 atoms on both sides.
Ca have 1 atom in both sides.
C have 1 atom on both sides and
O have 3 atoms on both reactant and product side
Ten years ago, the ratio of birds to snakes in a local desert ecosystem was 2:5. Over the last 10 years, disease and hunting by humans has cut the bird population in half. The snake population has not changed. What is the current ratio of birds to snakes in this local ecosystem?
A.
2:2.5
B.
2:5
C.
1:5
D.
1:2
The current ratio of birds to snakes in the local desert ecosystem is 1:5, after the bird population decreased by half in the last 10 years. Hence, option C 1:5.
The original ratio of birds to snakes was 2:5. Since the bird population has halved while the snake population has remained the same, the current ratio of birds to snakes in the ecosystem is 1:5.
2. Vanadium (V) Oxide equation
Answer:1. Or A
Explanation: I know this is right
Answer: V2O5
Explanation:
Balance the following chemical equation, then answer the following question. C8H18(g) + O2(g) →CO2(g)+H2O(g) How many grams of oxygen are required to react with 14.0 grams of octane (C8H18) in the combustion of octane in gasoline?
To react with 14.0 grams of octane, 48.9 grams of oxygen are required in the combustion of octane in gasoline.
Explanation:To balance the chemical equation C8H18(g) + O2(g) → CO2(g) + H2O(g), you need to ensure that the number of atoms of each element is equal on both sides of the equation. The balanced equation is:
C8H18(g) + 12.5O2(g) → 8CO2(g) + 9H2O(g)
To determine the mass of oxygen required to react with 14.0 grams of octane, you need to use stoichiometry. From the balanced equation, you can see that the mole ratio between octane and oxygen is 1:12.5. First, convert the mass of octane to moles by dividing it by its molar mass. Then, use the mole ratio to find the moles of oxygen. Finally, multiply the moles of oxygen by its molar mass to find the mass of oxygen:
14.0g C8H18 ÷ 114.22g/mol C8H18 = 0.1223 mol C8H18
0.1223 mol C8H18 × 12.5 mol O2 ÷ 1 mol C8H18 = 1.5288 mol O2
1.5288 mol O2 × 31.998 g/mol O2 = 48.9 grams of oxygen
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What is Mar’s thin atmosphere mostly made of?
Answer:
carbon dioxide
Explanation:
Final answer:
Mars's atmosphere is mainly made up of carbon dioxide (95%) with small amounts of nitrogen (3%) and argon (2%). Its thin atmosphere resembles the conditions found high in Earth's atmosphere and is only 0.007 bar in surface pressure, which contributes to the planet's dry and dusty landscape.
Explanation:
The thin atmosphere of Mars is primarily composed of carbon dioxide (CO2), which makes up about 95% of its atmospheric content. In addition to CO2, the martian atmosphere contains roughly 3% nitrogen and 2% argon. Mars's air is so rarefied that it resembles the conditions found at an altitude of around 30 kilometers above Earth's surface. The planet's low atmospheric pressure prevents the existence of liquid water on its surface, as well as making winds less forceful despite their high speeds. Nevertheless, these winds are able to carry fine dust particles across the planet, creating the characteristic red hue that covers Mars's landscape and occasionally causing massive dust storms.
While Mars currently has a very thin atmosphere, it likely had a much thicker atmosphere in the past which could have supported liquid water and potentially conditions suitable for life. Any existing life on Mars today might be found in protected environments below the surface, where conditions could still support it.
a car can accelerate from a standstill to 100 km/h [E] in 9.60s. calculate the average acceleration
Answer:
Acceleration is :
a = 2.89 m/s2
Explanation:
Acceleration : It is the change in the velocity of the object per unit time.
The object starts from the rest , so the initial velocity of the object is zero.
Initial velocity , u = 0
Final velocity = 100 km/h
Change the velocity to m/s because[ time unit is in second(9.60 s)]
1 km = 1000 m
1 hour = 60 x 60 sec = 3600 sec
[tex]1km/h=\frac{1000}{3600}m/s[/tex]
[tex]1km/hr=\frac{5}{18}[/tex]
[tex]100km/hr=\frac{5}{18}\times 100[/tex]
[tex]v=\frac{5}{18}\times 100[/tex]
v = 27.78 m/s
u = 0 m/s
time = 9.60 s
The acceleration"a" is calculated using :
[tex]a=\frac{v-u}{t}[/tex]
[tex]a=\frac{27.78-0}{9.6}[/tex]
[tex]a=\frac{27.78}{9.6}[/tex]
[tex]a=2.89m/s^{2}[/tex]
Ethanol (C2H5OH) is produced from the fermentation of sucrose in the presence of enzymes.
C12H22O11(aq) + H2O(g) 4 C2H5OH(l) + 4 CO2(g)
Determine the theoretical yield and the percent yields of ethanol if 735 g sucrose undergoes fermentation and 310.5 g ethanol is obtained.
theoretical
g
percent
%
Explanation:
to calculate theoratical yield...first we must calculate how much Sucrose moles we have..in order to to do so...we must calculate molar mass of sucrose.
molar mass of sucrose is 342.3 g/mol.
now we can calculate how many sucrose moles we have by dividing the mass with molar mass of sucrose
735g/(342.3g/mol)=2.147mol
theoratically...according to stoichiometry..every 1 mole of sucrose yields 4 moles of ethanol...so...
2.147mole yield 2.147*4mol=8.588mol
now we must calculate weight of that much ethanol..molar mass of ethanol is 46.07 g/mol...
so we can multiple moles by molar mass to obtain the weight 8.588mol*46.07g/mol=395.649g
but we only obtained 310.5g...so percentage we have is
[tex] \frac{310.5}{395.649} \times 100[/tex]
78.47%
if there is trouble with molar mases I used....use what you calculated...
If my explanation is good enough...please mark it as brainliest.thanks
please help
Unsaturated fats are comprised of lipids that contain ____.
nitrogen
many hydrogen atoms
relatively few hydrogen atoms
no double bonds
Unsaturated fats are comprised of lipids with one or more double bonds between carbon atoms, resulting in relatively few hydrogen atoms than saturated fats. Option C is correct.
Unsaturated fats are comprised of lipids that contain relatively few hydrogen atoms. This is because they include one or more carbon-carbon double bonds in their fatty acid chains.
In contrast to saturated fats, which have no double bonds and contain the maximum number of hydrogen atoms, unsaturated fatty acids are not saturated with hydrogen due to these double bonds. Examples of unsaturated fats include monounsaturated fats with one double bond, and polyunsaturated fats with multiple double bonds.
Hence, C. is the correct option.
The complete question is:
Unsaturated fats are comprised of lipids that contain ____.
A) nitrogen
B) many hydrogen atoms
C) relatively few hydrogen atoms
D) no double bonds
what properties can you use to identify if a substance is salt, baking soda or cornstarch?
Answer:i believe its water, vinegar, and iodine solution... sorry if wrong
Explanation:
The cornstarch and water mixture acts like a solid sometimes and a liquid at other times. This concoction is an example of a suspension (a mixture of two substances), one of which is finely divided and dispersed in the other. ... When you slap the cornstarch quicksand, you force the long starch molecules closer together.
If the atomic weight of nitrogen is 14.0, what is the mass of one mole of nitrogen gas (N2)?
Answer:
14 grammes
Explanation:
if atomic weight of Nitrogen = 14 g/mole
mole =mass(g) / atomic weight(g/mole)
mass = 1moles x 14(g/mole)
mass = 14 grammes of Nitrogen
Answer:
28.0.
Explanation:
Hello,
In this case, it seen that 1 only nitrogen weights 14.0 g/mol, in such a way, for diatomic nitrogen which is the most stable form of pure nitrogen has two nitrogens thereby the mass of one mole of nitrogen gas is 28.0g/mol because the aforementioned 14.0g/mol is multiplied by 2 accounting the two nitrogens.
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Is an aqueous solution of NaHSO4 acidic,basic, or neutral
An aqueous solution of NaHSO4 is acidic due to the bisulfate anion's ability to release an extra hydrogen ion into the solution, resulting in increased acidity.
Explanation:An aqueous solution of NaHSO4 (sodium hydrogen sulfate) is generally acidic. This is because the NaHSO4 is a salt formed from a strong acid (H2SO4 - sulfuric acid) and a weak base. The bisulfate anion (HSO4-) can release an extra hydrogen ion (H+) into the solution, increasing the acidity. Considering the acidity of H2SO4 and the neutral nature of NaOH, NaHSO4 in water partially dissociates into Na+ and HSO4-. The Na+ does not affect the pH, but HSO4- can donate a proton (H+) to water to form H3O+ (hydronium ions) and SO4^2- (sulfate ions), making the solution acidic.
Which of these would help maintain homeostasis during exercise?
increasing the amount of water excreted from the kidneys
developing goose bumps on the skin
speeding up the rate of breathing
decreasing the heart rate
Answer:
speeding up the rate of breathing
Explanation:
Answer:
speeding up the rate of breathing
Explanation:
when sulfereic acid is mixed with aluminum hydroxide the reaction produces aluminum sulfate wand water. if 3.24 g of sulferic acid and 0.945 g of alumium hydroxide were used, what is the theoretical yield of aluminum sulfate in grams
Answer:
2.26 g
Explanation:
Data given:
mass of Sulfuric acid = 3.24 g
mass of Aluminum hydroxide = 0.945 g
Theoretical yield of Aluminum sulfate = ?
Solution:
First we look for the balance reaction
Reaction
3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O
Now we look for the limiting reactant on which the amount of aluminum sulfate depends
So,
3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O
3 mol 2 mol
from above reaction it is clear that 3 mole of H₂SO₄ combine with 2 mole of Al(OH)₃
Convert moles to mass
• molar mass of Al(OH)₃
molar mass of Al(OH)₃ = 27 + 3(16 + 1)
molar mass of Al(OH)₃ = 27 + 45
molar mass of Al(OH)₃ =72 g/mol
• molar mass of H₂SO₄
molar mass of H₂SO₄ = 2(1) + 32 + 4(16)
molar mass of H₂SO₄ = 2 + 32 + 64
molar mass of H₂SO₄ = 98 g/mol
So,
3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O
3 mol (98 g/mol) 2 mol (72 g/mol)
294 g 144 g
So its clear from the reaction that 294 g of H₂SO₄ react with 144 g of Al(OH)₃
now if we look at the given amounts the amount Al(OH)₃ is less then the amount of H₂SO₄
So, for Al(OH)₃ if we calculate the needed amount of H₂SO₄
So apply unity formula
294 g H₂SO₄ ≅ 144 g of Al(OH)₃
X g H₂SO₄ ≅ 0.945 of Al(OH)₃
Do cross multiplication
X g H₂SO₄ = 294 g x 0.945 g / 144 g
X g of H₂SO₄ ≅ 1.93 g
So, 1.93 g of H₂SO₄ will react out of 3.24 grams, the remaining amount of it will be in excess.
So,
Al(OH)₃ will be consumed completely an it will be limiting reactant.
-----------
Now to Calculate for the theoretical yield
First we look for the balance reaction
Reaction
3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O
Now we look for the mole mole ration of Al(OH)₃ to the amount of aluminum sulfate produced
So,
3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O
2 mol 1 mole
from above reaction it is clear that 1 mole of Al₂(SO₄)₃ produce by 2 mole of Al(OH)₃
As we know that
2 mole of Al(OH)₃ = 144 g
So,
if 144 g of Al(OH)₃ gives 1 mole Al₂(SO₄)₃ then how many moles of Al₂(SO₄)₃ will be produces by 0.945 g Al(OH)₃
So apply unity formula
144 g of Al(OH)₃ ≅ 1 mole of Al₂(SO₄)₃
0.945 g of Al(OH)₃ ≅ X mole of Al₂(SO₄)₃
Do cross multiplication
X mole of Al₂(SO₄)₃ = 0.945 g x 1 mole / 144 g
X mole of Al₂(SO₄)₃ = 0.0066 moles
So,
0.945 g of Al(OH)₃ produce 0.0066 mole of Al₂(SO₄)₃
Now convert moles of Al₂(SO₄)₃ to mass
Formula used:
mass in grams = no. of moles x molar mass . . . . . . (1)
• molar mass of Al₂(SO₄)₃
molar mass of Al₂(SO₄)₃ = 2(27) + 3(32 +4(16))
molar mass of Al₂(SO₄)₃ = 54 + 3 (32 +64)
molar mass of Al₂(SO₄)₃ = 54 + 3 (96)
molar mass of Al₂(SO₄)₃ = 54 + 288
molar mass of Al₂(SO₄)₃ =342 g/mol
Put values in equation 1
mass in grams = 0.0066 g x 342 g/mol
mass in grams = 2.26 g
So the theoretical yield of Aluminum sulfate (Al₂(SO₄)₃ ) is 2.26 g
When a person holds an object, it has potential energy. How will the potential energy change if the person lifts the object above his or her head?
A.The object's potential energy will be zero.
B.The object's potential energy will be the same.
C.The object's potential energy will be less.
D.The object's potential energy will be greater.
Answer:D. The objects potential energy will be greater.
Explanation:
Potential energy is expressed in
PE = mgh
Where PE is the product of mass of the object, g which is acceleration to gravity and height.
PE and height is directly proportional which means that any changes in height will change the value of the PE. Increase in height means increase in PE.
Answer:
D.The object's potential energy will be greater.
Explanation:
the higher the object is the more potential energy it will have.
Assessment timer and count
Assessment items
Item 5
What is the stimulus shown in the photographs?
Two images, one showing an open Venus flytrap and the other showing Venus flytrap with an insect captured in its jaws
the plant growing toward the light
the trap closing over the insect
the insect touching the trigger hairs
light coming from a single direction
Answer:
The answer is: "the insect touching the trigger hairs"
Explanation:
I took the k-12 test and got a 100%!
How quickly can bacterial contamination occur?
5-10 seconds
5-10 minutes
10-20 seconds
10-20 minutes
Bacterial contamination can occur within seconds to minutes, depending on various factors such as the type of bacteria and the environment. The most accurate option among the given choices is 5-10 minutes.
Explanation:Bacterial contamination can occur very quickly, often within a matter of seconds or minutes. The actual speed of contamination depends on various factors such as the type of bacteria, the environment, and the presence of favorable conditions for bacterial growth. For example, if a person touches a contaminated surface and then touches their mouth or eyes, the bacteria can be introduced to their body almost immediately. Similarly, food left at room temperature for a few minutes can provide enough time for bacteria to multiply and contaminate the food.
Therefore, among the given options, the most accurate answer would be 5-10 minutes as a broad estimate of how quickly bacterial contamination can occur in certain situations.
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The correct answer is c. 10-20 seconds. bacterial contamination can occur in 10-20 seconds.
Bacterial contamination can occur very quickly, especially when proper food handling and hygiene practices are not followed. Cross-contamination between raw and cooked foods, or foods that will not be cooked, such as salads, can happen in a matter of seconds if they come into contact with contaminated surfaces, utensils, or hands. The time frame of 10-20 seconds is consistent with the rapid nature of bacterial transfer.
To prevent such contamination, it is crucial to maintain cleanliness in food preparation areas, wash hands thoroughly before handling food, and keep raw and cooked foods separate. The other options, 5-10 seconds, 5-10 minutes, and 10-20 minutes, do not accurately represent the speed at which bacterial contamination can occur, with the fastest being within seconds under the right conditions.
How many molecules are in 0.0124 mol of CH2O
Explanation:
Number of molecules can be calculated as ratio of given mass to molecular mass x Avogadro's number .
That is ;
Number of molecules = Given mass /molecular mass x Avogadro's number .
Number of molecules = given mass / molecular mass x 6.023 x 10²³
In the above asked question :
The moles of CH₂O = 0.0124 moles
The molecular mass = CH₂O
(atomic mass of C + +atomic mass of hydrogen + atomic mass of O
that is :
12 +1x 2+16=30
Now, substituting in formula, we get
number of molecules = 0.0124mole x Av. number '
Number of molecules = 0.0124 x 6.022 x 10²³
= 0.0746 x 10²³ molecules
give three examples of methods of measuring the amount of something and give an example of how one of these quantities can be converted to another type of quantity
To measure the amount of something we can:
Measure its massMeasure its volumeMeasure its number of molesWhy?
Those are the three ways of measuring the amount of substance. Mass is measured in grams (g) and can be measured using a balance, the volume is measured in liters (L) and can be measured using a graduated cylinder. Moles are often determined indirectly through titration or weighing.
To convert one quantity into another we often use conversion factors. To interconvert between mass and volume we use the density.
Density is defined as the amount of mass in a given volume of the substance. If we had a sample of 1000 mL of ethanol, and we wanted to find its mass, we'd have to apply the following conversion factor, knowing that the density of ethanol is 0.789 g/mL:
[tex]1000mLEtOH*\frac{0.789g}{1mL}=789 g[/tex]
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Physical quantities can be measured in various ways, such as using a meter stick for distance, a scale for weight, or a graduated cylinder for volume. Converting these quantities involves the process of Dimensional Analysis or Unit Conversion, which uses conversion factors to change from one type of unit to another. For example, kilometers can be converted to miles, and pounds can be converted to kilograms using known conversion ratios.
Explanation:There are numerous methods for measuring the amounts of different quantities. A few examples include measuring distance with a meter stick, weight using a scale, and volume using a graduated cylinder. Regarding conversions, quantities expressed in one unit can often be converted into a different unit. For example, we can measure the distance in kilometers and then convert it into miles using the conversion factor 0.621371miles/kilometer.
A common method used to convert between units is known as Dimensional Analysis or Unit Conversion. This involves using conversion ratios (also known as conversion factors) which represent relationships between different units of measure. These ratios are used to cancel out unwanted units and introduce desired ones. Take the example of converting kilometers to miles. We have the conversion ratio of 1 kilometer being approximately equal to 0.621371 miles, which becomes our conversion factor. If we have a given distance of 50 kilometers that we want to express in miles, we'd calculate 50km * 0.621371 miles/kilometer = ~31.07 miles.
Another example involves weight measurements. Often, these will be done in pounds but can be converted to kilograms using the conversion factor 1 pound is approximately equivalent to 0.453592 kilograms. Therefore, the weight of an object weighing 50 pounds would be converted as follows: 50 lbs * 0.453592 kg/pound = ~22.68 kilograms.
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Calculate the density of a proton, given that the mass of a proton is 1.0073 amu and the diameter of a proton is 1.73 × 10 ^− 15 m . The answer should be in g/cm^3
Answer:
Density = 6.17 * 10^14 g/cm³
Explanation:
Given Parameters
Mass of the proton = 1.0073 amu
Diameter of the proton = 1.75 * 10^-15 m
Required:
Calculate the density of the proton.
Density is calculated using the following formula;
Density = mass / volume
Where mass should be in grams and volume should be in cm ³
Calculating mass of a proton in grams.
Mass = 1.0073 amu
First, we convert to kilogram
Mass = 1.0073 * 1.66054 * 10^-27 kg
Then we convert to grams
Mass = 1.0073 * 1.66054 * 10^-27 * 10³ g
Mass = 1.0073 * 1.66054 * 10^-24 g
Mass = 1.673 * 10^-24 g
Then we calculate the volume of the proton
Volume = 4/3πR³ where R = Radius
And R = ½d.
First calculate the radius in centimetres
R = ½ * 1.73 * 10^-15 m
R = 0.865 * 10^-15
Convert to centimetres
R = 0.865 * 10^-15 * 10² m
R = 0.865 * 10^-13 cm
So, Volume = 4/3 * 3.14 * (0.865 * 10^-13)³
Volume = 4.187 * (0.865 * 10^-13)³
V = 4.187 * 0.865³ * 10^-39
V = 2.71 * 10^-39cm³
So, density = Mass / Volume becomes
Density = 1.673 * 10^-24 g / 2.71 * 10^-39cm³
Density = 0.617 * 10^15 g/cm³
Density = 6.17 * 10^14 g/cm³
Which of the following reactions is an example of a single replacement reaction?
Select one:
a. Mg + AgNO3 --> Ag + Mg(NO3)2
b. Fe + O2 --> Fe2O3
c. C6H12O6 + O2 --> CO2 + H2O
d. H2O --> H2 + O2
Answer:
Mg + AgNO₃ → Ag + Mg(NO₃)₂
Explanation:
A single replacement reaction is one in which an element gets replaced by another in a compound.
In the reaction
Mg + AgC→ Ag + Mg(NO₃)₂
Ag in AgNO₃ is replaced by Mg to give Mg(NO₃)₂.Only one element is getting replaced and hence it is a single replacement reaction.
How many electrons are depicted in the electron dot diagram of an electrically
neutral carbon atom?
O two
four
O six
eight
Answer:
Four
Explanation:
The electron dot diagram of elements or ions depict only the valence electrons. Carbon has atomic number of 6. The first shell has 2 electrons and gets filled. The second shell is filled by the remaining four electrons.The 4 electrons of the valence shell is shown in the electron dot diagram.
Wetlands are important ecosystems for many reasons. Select all that apply.
Question 10 options:
They help prevent flooding.
They filter excess nutrients, sediment, and even pollution from the water that flows through them.
They are a rich habitat for many plant and animal species.
They help increase the rate of extinction of mammals by creating a loss of habitat.
Answer:
They help prevent flooding.
They filter excess nutrients, sediment, and even pollution from the water that flows through them.
They are a rich habitat for many plant and animal species.
Explanation:
Wetlands are a unique ecosystem that serves as a rich habitat for many plant and animal species. It is an area of soil that is covered by water. These can be found anywhere in the world. Many of the animals such as mammals, fish and birds need wetlands for their growth. It also provides an ecosystem capable for growing plants, crops and the like. Thus, they are a rich habitat for many plants and animals.
Wetlands also filter excess nutrients, sediment and even pollution from the water that flows through them. This allows the purification of surface water. The nutrients are taken up by plants and other microorganisms while the sediments settle at the bottom.
Wetlands help prevent flooding by absorbing much of the water during storms. Their function is similar to that of a sponge whereby they can hold as much water as possible. This is the reason why the government is aiming to preserve such distinct ecosystems.
if you combine 390.0 mL of water at 25.00 °C and 110.0 mL of water at 95.00 °C, what is the final temperature of the mixture? use 1.00 g/mL as the density of water.
Answer:
T(final) = 40.4 °C
Explanation:
Given data:
Density of water = 1.00 g/mL
Volume of water at 25°C = 390.0 mL
Volume of water at 95°C = 110.0 mL
Final temperature of mixture = ?
Solution:
Heat absorbed by warm water = heat lost by hot water
q lost = -q lost ....... (1)
Formula:
q = m.c.ΔT
ΔT(warm) = T(final) - 25°C
ΔT(hot) = T(final) - 95°C
Mass of water:
d = m/v
1 g/mL = m/ 390 mL
390 g = m
For hot water:
d = m/v
1 g/mL = m/ 110.0 mL
110.0 g = m
Now we will put the values in equation 1.
390 g. c. (T(final) - 25°C) = - 110.0 g .c. (T(final) - 95°C)
390 T(final) - 9750 °C = -110 T(final) + 10450 °C
390 T(final) +110 T(final) = 10450 °C +9750 °C
500 T(final) = 20200
T(final) = 20200/500
T(final) = 40.4 °C