If you build a campfire, you start with a large stack of sticks and logs. As the fire burns, the stack slowly shrinks. By the end of the evening, all that is left is a small pile of ashes. What happened to the matter that you started with? Was it destroyed by the flames? It may seem that way. What do you think happened? The truth is that the same amount of matter still exists. The wood changed not only to ashes, but also to carbon dioxide, water vapor, and other gases. The gases floated off into the air, leaving behind just the ashes. Although matter was changed, it was not created or destroyed. Because the same amount of matter still exists, we can say that matter is conserved. You may wonder how it can be conserved if something is now missing? Assume you had measured the mass of the wood before you burned it. Assume you had also trapped the gases released by the burning wood and measured their mass and the mass of the ashes. What would you find? The ashes and gases combined have the same mass as the wood you started with. This example illustrates the law of conservation of mass.

Question: "What can cause wood to change to ashes, carbon dioxide, water vapor, and other gases?"

OPTIONS:
- no
- yes

Answer: "Burning the wood"

Response: yes

Rough surfaces create more friction than smooth surfaces. Thats why cars have tires. Its also why we use rubber mats in areas that might get wet. In your bathtub, you may even use No-Slip tape. No-slip is another way of saying the items has a lot of friction. In Figure 1.9, the blades of the skates are very smooth. Thats why you cant slide across ice with shoes. The soles of your shoes are much rougher than skates. The rougher surface of shoes causes more friction and slows you down. Heavier objects also have more friction. A heavy object presses down with more force. The surfaces are held together more tightly. This makes the surfaces harder to slide past each other. Did you ever try to push something heavy across the floor? Heavy objects are much harder to push than light objects.

Question: "Why do cars have tires?"

Response: "To go faster"
OPTIONS:
- no
- yes

A: no

Problem: Charlie Y. Reader is a 35-year-old theatrical agent in New York , living a seemingly idyllic life as a bachelor . Numerous women ( among them Poppy , Helen , and Jessica come and go , cleaning and cooking for him . Charlie 's best friend since kindergarten , Joe McCall , who has a wife named Ethel and children in Indianapolis , comes to New York for a stay at Charlie 's apartment , claiming that the excitement is gone from his 11-year marriage and that he wants to leave his wife . Joe envies and is amazed by Charlie 's parade of girlfriends , while Charlie professes admiration for Joe 's married life and family . At an audition , Charlie meets singer-actress Julie Gillis . She has her life planned to a tight schedule , determined to marry and retire from performing to a life of child-rearing by 22 . Although at first she wards off Charlie 's advances , she comes to see him as the ideal man for her plans . Julie demands that Charlie stop seeing other women . Charlie balks , but he begins to fall in love with her . Joe starts keeping company with Sylvia Crewes , a sophisticated classical musician and a typically neglected lover of Charlie 's . Sylvia is approaching 33 and desires marriage as much as the younger Julie does . One day , annoyed by Julie and possibly jealous of Joe 's attentions , Charlie blurts out a proposal of marriage to Sylvia . She is thrilled , only to discover the morning after their engagement party that he has proposed to Julie as well . Joe confesses his love to Sylvia and asks her to marry him .

Question: "Julie demanded what out of Charlie?"

Answer: "See other woman"

OPTIONS:
- no
- yes
Answer: no

Question:
And William Martinez, 28, who cut his medical school studies short because he couldn't afford the $39,000 in loans after two years of graduate school and four years of college. Martinez works two jobs as a physician's assistant and supports his elderly parents and 8-year-old son. Uncommon Good has a 22-member board of doctors, lawyers and representatives of Christian groups and is recruiting mentors. One goal is to get the state Legislature to pass a law to provide loan forgiveness to medical professionals and lawyers who work with the poor. Mintie said she hopes her organization can be a national model for other professions. She is trying to bring legal aid services to the Inland Valley -- the closest legal aid office is in El Monte and represents 700,000 poor people throughout the San Fernando, San Gabriel and Inland valleys. "Unless the legal aid is in the community, you can't say you are serving the poor," Mintie said. Neal Dudovitz is the executive director of Neighborhood Legal Services of Los Angeles County, the legal aid office in El Monte. He sees attorneys new to poverty law leave all the time because they can't afford the salary with their law school debt. "She's really opened a lot of eyes in terms of having people understand how the educational debt is limiting and reducing the services that are available to low-income communities," Dudovitz said. "Nancy is light years ahead of the curve on this stuff. Very little is being done practically to solve it." Mintie, her colleagues say, could have made a lot of money in private practice. "She's very kind and pleasant," said Julius Thompson, 45, an attorney at Inner City Law Center and an Uncommon Good recipient. "But she's also a woman on a mission. When she sets her sights on something, she's a formidable force." After reading the above, is "Educational debt" the correct answer to the question "What is the reason Neal Dudovitz sees so many new poverty law attorneys leave?"? OPTIONS:
- no
- yes

Answer:
no

Hamilton argued that the natural faculties of blacks were as good as those of free whites, and he warned that the British would arm the slaves if the patriots did not. In his 21st-century biography, Chernow cites this incident as evidence that Hamilton and Laurens saw the Revolution and the struggle against slavery as inseparable. Hamilton attacked his political opponents as demanding freedom for themselves and refusing to allow it to blacks. In January 1785, Hamilton attended the second meeting of the New York Manumission Society (NYMS). John Jay was president and Hamilton was the first secretary and later became president. Chernow notes how the membership soon included many of Hamilton's friends and associates. Hamilton was a member of the committee of the society that petitioned the legislature to end the slave trade, and that succeeded in passing legislation banning the export of slaves from New York. In the same period, Hamilton felt bound by the rule of law of the time and his law practice facilitated the return of a fugitive slave to Henry Laurens of South Carolina. He opposed the compromise at the 1787 Constitutional Convention by which the federal government could not abolish the slave trade for 20 years, and was disappointed when he lost that argument. Hamilton never supported forced emigration for freed slaves. Horton has argued from this that he would be comfortable with a multiracial society, and that this distinguished him from his contemporaries. In international affairs, he supported Toussaint L'Ouverture's black government in Haiti after the revolt that overthrew French control, as he had supported aid to the slaveowners in 1791--both measures hurt France. Scant evidence has been interpreted by a few to indicate Hamilton may have owned household slaves, as did many wealthy New Yorkers (the evidence for this is indirect; McDonald interprets it as referring to paid employees).

Question: "Hamilton was the first president of what New York, abolitionist organization?"

OPTIONS:
- no
- yes

Answer: "New Yorkers"

Response:
no