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Burka [1]
3 years ago
15

Carbon (C) and hydrogen (H) are pure substances. Each is made of only one type of atom, but carbon atoms are different from hydr

ogen atoms. Carbon and hydrogen chemically combine to form methane (CH4)
Based on this information,


A.
carbon, hydrogen, and methane are all compounds.
B.
methane is an element and carbon and hydrogen are compounds.
C.
carbon and hydrogen are elements and methane is a compound.
D.
carbon, hydrogen, and methane are all elements
Physics
2 answers:
xeze [42]3 years ago
6 0

the answer to this question is c


eimsori [14]3 years ago
5 0
C is the correct answer.

all substances found on the periodic table are elements by definition. anything that is created using elements, such as methane, carbon dioxide, or water, are all compounds.
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1 year ago
A 2kg block has 70J of KE. It then travels 1.5 meters up a hill. As it travels up the hill friction does -12J of work on the blo
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Answer:

v = 5.34[m/s]

Explanation:

In order to solve this problem, we must use the theorem of work and energy conservation. This theorem tells us that the sum of the mechanical energy in the initial state plus the work on or performed by a body must be equal to the mechanical energy in the final state.

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E_{1}=E_{pot}+E_{kin}+E_{elas}\\

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70 - 12 = \frac{1}{2}*2*v^{2}+2*9.81*1.5

58 = v^{2} +29.43\\v^{2} =28.57\\v=\sqrt{28.57}\\v=5.34[m/s]

4 0
3 years ago
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