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John Dalton believed that: Atoms are made of mostly empty space. Chemical changes are the result of different atomic combinations. Violent chemical reactions can divide atoms into smaller particles. All
answered
Jul 31, 2018
Biology
high-school
3
votes
195k
views
Try rubbing a plastic pen through your hair, and you'll find that you can pick up a tiny scrap of paper when the pen is about one centimeter above the paper. from this simple experiment you can estimate
answered
Jun 28, 2018
Physics
high-school
7
votes
215k
views
You plant a 14-inch hemlock tree in your backyard that grows at a rate of 4 inches per year and an 8-inch blue spruce tree that grows at a rate of 6 inches per year. in how many years after you
answered
Feb 26, 2018
Mathematics
high-school
6
votes
104k
views
Simplify the expression. write the answer using scientific notation. (0.4 x 10^-6 (0.7 x 10^-2
answered
Feb 8, 2018
Mathematics
high-school
4
votes
14.8k
views
Catherine finds that in a randomly selected sample of 500 families in her hometown, 45% own at least one computer. Her research shows that there is a total of 35,000 families in her town. Which statements
answered
Jan 9, 2018
Mathematics
middle-school
5
votes
6.8k
views
*Please Help! For a process, if the enthalpy change of a system is 1.25 ' 10^5 J and the entropy change is 300.0 J/K... Can someone help me calculate the free energy change of the system at 290 K?
answered
Sep 5, 2017
Physics
high-school
5
votes
97.8k
views
Tasha earns $400 per week plus a commission of 10% on her weekly sales. Each week she saves of her earnings. In the expression , what does the expression 400 + 0.1s represent in this situation?
answered
Jul 27, 2017
Mathematics
high-school
5
votes
60.0k
views
Simplify the fraction -(2x/-xy) completely.
answered
Jul 1, 2017
Mathematics
high-school
3
votes
59.8k
views
Tyrone’s hourly wage is $18 and his net pay is 72% of his earnings. Tyrone spends about $1,800 on his monthly expenses. If Tyrone works 40 hours per week and has no other sources of income, what is his
answered
Apr 7, 2017
Mathematics
high-school
5
votes
29.8k
views
During world war i, buying war bonds was a way for people to
answered
Jan 25, 2017
History
high-school
7
votes
202k
views
When Justice Lewis Powell stated that racial and ethnic distinctions require the most “exacting judicial examination,” he meant these qualities required
answered
May 24, 2016
History
high-school
5
votes
122k
views
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