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eimsori [14]
2 years ago
10

Please help i will give extra points

Chemistry
1 answer:
GREYUIT [131]2 years ago
3 0

Answer:

B. Coal

Explanation: Coal is mined to produce energy.

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Brainliest!!!!!!Parking lots and other man made ground coverings may increase erosion around there edges
ollegr [7]

Answer:

true trust ong gotta be true fff

4 0
2 years ago
Phthalates, BPA, PFOA, and Atrazine are chemicals that don't degrade rapidly, and they are readily taken up by cells in the body
m_a_m_a [10]

Answer:

Endocrine disruptor

Explanation:

This means that the four substances, even they are used in different areas like gardening, plastics or pots, all of them change the endocrine system in humans because they imitate the natural hormones and the body stops to produce them or starts to produce more hormones than the body needs.

They are correlate with some illness like cancer, thyroid problems and infertility.

7 0
3 years ago
How many sigma and pi bonds does it contain ch3chchco2h?
ira [324]
Answer:
            But-2-enoic acid has 11 Sigma Bonds and 2 Pi Bonds.

Explanation:
                   The sigma bonds which are formed due to head to head overlap of partally filled orbitals are shown in red color, while Pi bonds which are formed after the formation of sigma bond by overlap of orbitals perpendicular to the sigma bond are shown in blue color.

8 0
3 years ago
What is the de Broglie wavelength, in cm, of a 11.0-g hummingbird flying at 1.20 x 10^2 mph?
KonstantinChe [14]

Answer:1.123 x 10^-31cm

Explanation:

mass of humming bird=  11.0g

speed= 1.20x10^2mph

but I mile = 1.6m

1km=1000

I mile = 1.6x10^3m

1.20x10^2mph= 1.6x10^3m /1mile x at 1.20 x 10^2

=1.932 x10^5m

recall that  

1 hr= 60 min

1 min=60 secs, 1hr=3600s

Speed = distance/ time

=1.932 x10^5 / 3600= 5.366 x 10 ^1 m/s

m= a 11.0g= 11.0 x 10^-3kg

h=6.626*10^-34 (kg*m^2)/s

Wavelength = h/mu

= 6.626*10^-34/(11 x 10^-3 x 5.366x 10^1)

6.63x10^-34/ 590.26x 10 ^-3= 1.123 x10^-33m

but 1m = 100cm

1.123 x 10 ^-33 x 100 = 1.123 x 10^-31cm

de broglie wavelength of humming bird = 1.123 x 10 ^-31cm

5 0
3 years ago
Behavioral therapy began with _______________.
Mrac [35]

Answer:

B

Explanation:

Behaviour therapy was popularized by the U.S. psychologist B.F. Skinner, who worked with mental patients in a Massachusetts state hospital.

3 0
2 years ago
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