A 3. 75-g sample of limestone (caco3) contains 1. 80 g of oxygen and 0. 450 g of carbon. What is the percent o and the percent c in limestone?.
Answers
Taking into account the definition of percent by mass, the percent O and the percent C in limestone are 48% and 12% respectively.
One way to express the composition of the solution is the percent by mass.
The percent by mass (or weight) of a solution is the number of grams of solute in every 100 grams of solution.
The percentage by mass is calculated as the mass of the element or solute divided by the mass of the compound or solute, the result of which is multiplied by 100 to express it as a percentage:
\(percentage by mass=\frac{mass of solute}{mass of compound} x100\)
In this case, you know:
mass of O= 1.80 gmass of C= 0.450 gmass of the sample= 3.75 gThen, the percent O is:
\(percentage by mass of O=\frac{1.80 g}{3.75 g} x100\)
percentage by mass of O= 48%
And the percent C is:
\(percentage by mass of C=\frac{0.450 g}{3.75 g} x100\)
percentage by mass of C= 12%
Finally, the percent O and the percent C in limestone are 48% and 12% respectively.
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when reading a historical narrative, critical thinkers need to ask which of the following questions?
Answers
Answer:
There are two Reflective questions to ask after reading a narrative. One is "Is this experience typical of a larger group?" and the other is to ask yourself if you would have done something differently than the person in the story.
Explanation:
How many miles does someone run in an 8km race?
Answers
Answer:
5 miles
Explanation:
Answer:
about 5 miles, or 4.97097
Explanation:
why is Pluto called a ,"dwarf planet" ?
Answers
Answer:
Pluto is called a dwarf planet because it does not meet the three criteria set forth by the International Astronomical Union (IAU) for a full-sized planet.
These criteria are:
It must be in orbit around the Sun.It must be massive enough for its self-gravity to overcome rigid body forces so that it assumes a hydro-static equilibrium (nearly round) shape.It has cleared the neighborhood around its orbit.Pluto meets the first two criteria, but it does not meet the third. The Kuiper Belt is home to many other objects that are similar in size to Pluto, and these objects share Pluto's orbit. This means that Pluto has not cleared its neighborhood of other objects, as a planet is supposed to do.
As a result of this, Pluto was reclassified as a dwarf planet in 2006. There are now five dwarf planets in our solar system: Pluto, Ceres, Eris, Makemake, and Haumea.
Answer and Explanation:
Pluto is called a "dwarf planet" because it does not meet the criteria to be classified as a full-fledged planet. In 2006, the International Astronomical Union (IAU) redefined the definition of a planet, which led to Pluto being reclassified as a dwarf planet. Here are the main reasons why:
1. Size: While Pluto is larger than some moons in our solar system, it is much smaller than the eight traditional planets like Earth, Jupiter, and Saturn. Its size is comparable to other objects in the Kuiper Belt, a region beyond Neptune where many icy bodies reside.
2. Orbit: Unlike the eight planets that have relatively clear paths around the Sun, Pluto has a more elongated and inclined orbit. This means it has a more irregular path and crosses the orbit of Neptune at certain points. This is different from the regular, more circular orbits of the traditional planets.
3. Neighborhood: Pluto is part of a region called the Kuiper Belt, which consists of numerous icy bodies and small objects. This region is distinct from the inner solar system where the eight traditional planets reside. The presence of many similar-sized objects in its vicinity further influenced the decision to reclassify Pluto.
By considering these factors, the IAU determined that Pluto did not meet the criteria to be classified as a planet. Instead, it was designated as a dwarf planet, a new category that acknowledges its unique characteristics and its place in the Kuiper Belt.
It's important to note that this reclassification sparked some debate and controversy among astronomers and the public. However, the IAU's decision to classify Pluto as a dwarf planet is the current scientific consensus.
The complete combustion of ethanol, c2h5oh (fw = 46. 0 g/mol), proceeds as follows: c2h5oh(l) + 3 o2(g) → 2 co2(g) + 3 h2o(l) δh = −555 kj what is the enthalpy change for combustion of 15. 0 g of ethanol?
Answers
The enthalpy change for combustion of 15.0 g of ethanol can be calculated using the equation δH = -555 kJ/mol x (moles of ethanol).
What is ethanol ?Ethanol, or ethyl alcohol, is a type of alcohol with the molecular formula C2H5OH. It is a colorless, volatile, flammable liquid that has a somewhat sweet odor and taste. Ethanol is a renewable fuel that can be derived from corn, wheat, barley, and other grains, as well as from cellulose-based feedstocks.
To calculate the moles of ethanol, 15.0 g (the mass given) must be divided by the molar mass of ethanol, 46.0 g/mol.
15.0 g/46.0 g/mol = 0.326 mol
Therefore, the enthalpy change for combustion of 15.0 g of ethanol is given by the equation:
δH = -555 kJ/mol x 0.326 mol = -180.3 kJ
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Explain (or list) at least five reasons why you will benefit from going to college or trade school.
Answers
Answer:
1. Improved job prospects:
By completing a degree or trade program, you can have access to more job opportunities and higher-paying jobs.
2. Enhanced skills and knowledge: College and trade school education can equip you with the skills and knowledge needed to excel in your chosen field.
3. Networking opportunities: Attending college or trade school can help you build professional networks that can be useful for career advancement.
4. Personal growth: College or trade school can help you develop independence, critical thinking, and other essential skills that can benefit you throughout your life.
5. Greater earning potential: Completing a college degree or trade program can lead to higher earnings and a better quality of life in the long run.
According to the article, how did vietnam and watergate shape american perception?.
Answers
The Vietman war had a huge effect on the American people.
The Vietnam and Watergate shape American perception in the following ways:
It made the people to have doubt and distrust on the American government and government officials (politicians).The people lack faith that the government has become shady in handling the country affairs.There was doubt of the office of the presidency and assume the government are doing a cover up.The distrust about the Vietman war arises due to the fact that the American president lied to Americans about the war.
Before the Vietnam War, most Americans believed in the government and they completely trust them.
America not only losed the war, and the lives of thousands of young men and women but it also changed them as a country.
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In Passage 1, the analogy to "revelers on a ship" (line 29) serves mainly to
Answers
Answer: bad
Explanation:
Line 29 of Passage 1's parallel to "revellers aboard a ship" emphasizes the dynamic interaction between group members inside a galaxy.
What is dynamic interaction?A theory of personality and behaviour in which continual, reciprocal engagement with the environment is essential for individual growth. Interest is viewed as a dynamic relationship between a person and specific events, objects, tasks, or ideas in their surroundings. Such interactions can result in the desired psychological condition, which is characterized by improved cognitive and affective functioning.The American Marketing Association (AMA) defines consumer behaviour as the dynamic interaction of affect and cognition, behaviour, and environment through which humans perform the transaction portions of their life. Consumer behaviour includes people's thoughts, feelings, and actions during the consumption process. A new method for allowing many elements on the same app page to communicate with one another is through dynamic interactions.To learn more about dynamic interaction, refer to:
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Why do signs that refer to females involve touching the chin? A. When this practice developed, women were considered to be outspoken, so all female references used the chin B. It was coincidental at first and then later organized for all female references C. This practice is based on the fact that women used to wear bonnets D. Chins represented a smaller portion of the face and women generally had a smaller frame than men
Answers
Answer:
C) This practice is based on the fact that women used to wear bonnets
Explanation:
Answer:
C) This practice is based on the fact that women used to wear bonnets
Explanation:
Why is gum pink? I've always been wondering about this.
Answers
Answer: Bubble gum got its distinctive pink color because the original recipe Diemer worked on produced a dingy gray colored gum, so he added red dye (diluted to pink) as that was the only dye he had on hand at the time.
what factors would you include in your letter to help educate people, including other citizen-scientists, about the importance of preserving biodiversity?
In Science
Answers
Answer: The factors I would include in my letter to help educate people is that in the niche diversity, a niche could be shared by two different species so they would compete for resources. If they are low, then one species may die out. The importance of preserving biodiversity is because of the natural resources which are often at the root of conflict.
Explanation:
Which of the following is NOT a factor of 4x² + 12x - 16?
Answers
Answer:
what are the options for the answer?
Explanation:
when you factor it, it would be 4(x-1) (x+4) -- this is the correct answer, so it is not this.
A fish tank in a pet store was less than half full of
water when a worker turned on a hose to fill the
tank at a constant rate. After the hose was on for
5 minutes, the tank was exactly half full. After
the hose was on for 30 minutes, the tank was
three-quarters full. How many minutes did it take
after the hose was turned on for the tank to be
completely filled with water?
Answers
During 25 minutes, it got filled 1/4 more (3/4 - 1/2)
So it would take 100 minutes to completely fill it
4. Look at the stanza of the poem where the word "hear!" is repeated before th
bleeding drops of red." What does the speaker emphasize when he repeats
kind of mood does this repetition create?
Answers
The speaker emphasizes the sound of the drops hitting the ground, creating a sense of impact and finality.
How does he use repetition?By repeating "hear!" twice, the speaker draws attention to the sound of the drops hitting the ground, as if urging the listener to really listen to and understand the gravity of the situation.
This creates a sense of impact and finality as if each drop is a definitive end to something and thus we can see that the thing which this does in the grand scheme of things is that it emphasizes the sound of the drops hitting the ground, creating a sense of impact and finality.
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Hear! Hear! the mournful cry,
Of bleeding drops of red,
As they fall and drip and die,
On the ground where brave men tread.
Some keep me company ifykyk
Answers
Answer:
hi
Explanation:
I just hit switch..... punch punch - Sicko Mode
Answers
WIAHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
For a lemonade stand, the total cost c, in dollars, of selling n cups of lemonade is given by c=100+ 1.5n. What is the best interpretation of
the number 100 in this equation?
Answers
Why were the Hollywood Ten blacklisted?
because they made movies about controversial subjects
because they were writers, directors, and producers
because they were suspected to have communist ties
because they could not be forced to name radicals they knew
Answers
Answer:
because they were suspected to have communist ties
Explanation:
This was during the years of the cold war and the second red scare where many people were being suspect of having communist ties.
Answer:
Because they were suspected to have communist ties.
Explanation:
Gradpoint
I’m not really understanding how to do this thought the book’s explanation. This type of question doesn’t look familiar.
Answers
The least possible value of (6/5)p+2 is C) 16.
How to estimate the least possible value of (6/5)p+2?To compute the least possible value of (6/5)p+2, we first solve the inequality (3/5)p - 2 ≥ 5:
(3/5)p - 2 ≥ 5
(3/5)p ≥ 7
p ≥ 35/3
Next, we find the least possible value of (6/5)p+2:
Putting p = 35/3 into the expression, we have:
(6/5)(35/3) + 2 = 16
Let us solve (6/5)(35/3), first.
So, (6/5)(35/3) = (6 * 35) / (5 * 3) = 210 / 15 = 14.
Then, we add 2:
14 + 2 = 16.
Thus, the least possible value of (6/5)p+2 is 16.
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an eagle has a mass of 8 kg and is flying 85 m above the ground with a speed of 20 m/s
Answers
total mechanical energy=KE+PE
KE = (1/2)mv^2
=(1/2)x8x20^2=1600 J
PE= mgh
g≈10 m/s^2
=8x10x85=6800 J
total mechanical energy =1600+6800=8400 J
will give brainliest
Why do people who participate in marathons tend to have smaller muscles? A. Lifting weights provides no benefits for them. B. Muscle endurance is more important for them than muscle strength. C. Continuous running burns glucose and fat. D. They participate in a sport more suited to their body type. Please select the best answer from the choices provided. A B C D
Answers
Answer:
I believe it's option C.
Motivate why a study on poverty is important .
Answers
Answer: Learning poverty severity captures the inequality of learning among the learning poor population and is the gap squared in relation to the minimum proficiency squared. The concepts of learning poverty gap and learning poverty severity are important to fully understand children's access to learning.
E. Verb Tenses (10 sentences)
1. By the time the customs officers came, the smugglers,
Linda yesterday.
2. 1 Sw
3. Listen! The doorbell Pi
4. If I knew
5. Dil you
her well. I would speak to her.
call
Georgia last night?
hard, you will pass the test.
10%
Stady
6. If you
7. I didn't sleeh for two days.
Rinking
8. Tom avoids
she usually
10. If he buys a new car, he will sell his old one.
(escape)
(500)
(know)
(call)
(study)
(not/sleep)
(drink)
a party on her birthday? (have)
(sell)
(ring)
Answers
2. I swim every morning to stay in shape.
3. Listen! The doorbell is ringing.
4. If I knew her well, I would speak to her.
5. Did you study hard? You will pass the test.
6. If you don't call Georgia last night, she will be upset.
7. I haven't slept for two days.
8. Tom avoids drinking alcohol.
9. What kind of party will she usually have on her birthday?
10. If he buys a new car, he will sell his old one.
it falls under the senior high school track of?
Answers
Answer:
im sry i dont understand if quetsion is actual one that needs help or a free point one
if actual one im sry
if not thx
Explanation:
A wildfire destroys 90% of the trees of a forest. What will most likely happen to the animal population that lives in the forest?
Answers
The population will decrease because many of the animals will not survive.
Which text feature best indicates the purpose of this text? the heading indicating an electronic communications policy the words in italics signaling the importance of the announcement the heading indicating that the information is for all employees the bullet points identifying the two main messages of the text
Answers
Answer:
a
Explanation:
A document that outlines an organization's strategy for internal communication with its employees is known as an internal communication policy.
What is Communication Policy?What information can be shared and communicated, as well as how, are highlighted and acknowledged by the internal policy.
An organization's internal communications are just as crucial as its exterior communications.
If executed properly, your internal communications can turn your employees into brand advocates. Unfortunately, many firms are still employing antiquated methods to interact with their staff; following tactics that are no longer relevant or effective.
Therefore, A document that outlines an organization's strategy for internal communication with its employees is known as an internal communication policy.
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Who was Alexander Graham Bell?
Answers
Help plz lol………………………….
Answers
Answer:
105/330
Explanation:
drama:
25 students
both:
60 students
sports:
140 students
total:
225 students
330-225=105
Why did Maggie not have flood insurance? Check all that apply. Storms in her region are highly unlikely. She wanted to pay for repairs with her own money. She felt she needed to save money. She may have misunderstood her basic homeowners policy. Her expenses were already high before paying for insurance.
Answers
here are the reasons why Maggie did not have a flood insurance.
C. She felt she needed to save money.
D. She may have misunderstood her basic homeowners policy.
E. Her expenses were already high before paying for insurance.
According to the question, Maggie did not have enough money. She already had more than enough expenses.
The passage also said that there were months that the amount that she had was hardly enough to take care of basic needs.
She did not understand the home owners policy because she was told that they would offer it to her at an additional cost. She may have thought that she already had it covered.
Reasons why Maggie did not have a flood insurance are :
She may have misunderstood her basic homeowners policy.She felt she needed to save money.Her expenses were already high before paying for insurance.Who is insurance?Insurance is a method by which you can protect yourself and your loved ones from facing a financial crisis.
Maggie did not really understand the home owners policy because she was informed that the house would be offered to her at extra cost hence may have thought that she already had it covered.
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Part A:
Which statement supports the idea in Passage 4 that it was Anna's dream to become a wrangler?
Anna believes her Papa does not have confidence in her.
Anna feels she is just as qualified as the men on the cattle drive.
Anna remembers the experiences she had on the ranch as a young child.
Anna knows her Papa will need all the help he can get if there is a stampede.
Part B:
Select a sentence from Passage 4 that supports your response to Part A.
“Anna closed her eyes and tried to sleep, but couldn’t. The men will need my help!” (paragraph 3)
“She lost herself in memories of working on the ranch with Mama and Papa. That was when Anna had learned to love wrangling.” (paragraph 10)
“At full speed, Anna guided Copper toward the stampeding cattle.” (paragraph 16)
“Anna nodded, then headed toward the point to help force the leaders back into the herd.” (paragraph 19)
Answers
Answer:
Anna believes her Papa does not have confidence in her.
Explanation:her papa does have confidence in her
What is dry and hard but when you put it in it comes out Wet and Gushy
Answers
Answer:
A tea bag or cement.
Explanation:
Answer:
a tea bag
Explanation:
it's dry and sometimes hard and when you take it out it's wet and gushy