Questions by Mark Estrada

Questions by Mark Estrada

What happened as chemists used the scientific method to search for new elements?

asked Apr 13, 2018

1 answer

1 vote

183k views

Pls help me guys! Thanks =P

asked Feb 11, 2018

1 answer

5 votes

111k views

the area of a triangle inscribed in a circle is 60cm^2 and the radius of the circumscribed circle is 8cm. If the 2 sides of the inscribed triangle measure 10cm and 12cm, find the length of the third size.

asked Aug 11, 2017

1 answer

2 votes

154k views

By using the following reactions, calculate the heat of combustion of pentane: C5H12 (g) + 8O2 (g) → 5CO2 (g) + 6H2O (l). C (s) + O2 (g) → CO2 (g), ΔH = –395 kJ H2 (g) + 1/2O2 (g) → H2O (l), ΔH = –285

asked Aug 7, 2017

1 answer

5 votes

31.0k views

Describe how electron movement is related to the bonding in methane, ch4.

asked Apr 2, 2017

1 answer

1 vote

95.8k views

Many U.S. farmers have lost their family farms over the last 40 years because they could not _____.

asked Feb 9, 2017

2 answers

1 vote

115k views

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