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Sophie [7]
3 years ago
7

The continents of Africa and South America used to "fit together" like puzzle pieces. About how far back in time would you have

to go to find Africa and South America connected together?
*600 million years
*430 million years
*150 million years
*90 million years
Chemistry
1 answer:
Zepler [3.9K]3 years ago
5 0
<span>The best answer is C. Alfred Wegener was convinced that all continents were once an enormous, single landmass which is call Pangaea. But it was also believed that it began to break into pieces that moved away from one another over 150 million years ago.</span>
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How many elements are found in the third period. A.2 B.18 C.8 D.32​
mamaluj [8]

Answer:

8

Explanation:

u can find it on ur chemistry book

3 0
3 years ago
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1. The Rast method for determining molar masses uses camphor as the solvent. Camphor melts at 178.4 °C, and its large Kf (37.7 K
sergejj [24]
The melting point of camphor is 178.4°C which is also the freezing point.
After the unknown substance is added, the freezing point is reduced to 173.6°C.
The freezing point depression is
178.4°C - 173.6°C = 4.8°C
The molar mass of the substance can be found using the equation
Kf m = 4.8
37.7 (0.664 / MW) = 4.8
MW = 5.22 g/mol
4 0
2 years ago
What did earth look like before life began
melisa1 [442]

Answer:

Like a jungle with trees everywhere

Hope This Helps!   Have A Nice Day!!

5 0
3 years ago
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What mass of ch4 is consumed when 587. 9 kj of energy is evolved from the combustion of a mixture of ch4(g) and o2(g)? show the
Juliette [100K]

The mass of CH₄ that is consumed is 10.598 g.

<h3>What is enthalpy?</h3>

The enthalpy of a system is defined as the sum of the internal energy of a system and the energy that is produced due to its pressure and volume.

It is given by

H = U+PV

The following reaction takes place during the combustion of CH₄

CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(g)

Energy evolved during the combustion, E = 587.9 kJ

Enthalpy of combustion of methane, ∆H = 890.3 kJ

No of moles of CH_4 =\frac{energy evolved}{enthalpy of combustion}

= 587.9 /890

Mass of CH₄  that is consumed = no of moles × molar mass of CH₄

  = 587.9 /890 × 16

   = 10.598 g

The mass of CH₄  which is consumed is 10.598 g

Learn more about enthalpy:

brainly.com/question/14047927

#SPJ4

6 0
1 year ago
4. If 175 undecayed nuclei remain from a sample of 2800 nuclei, how many half-
Irina18 [472]

Answer:

X = 4

Explanation:

Start 2800

End 175

175 = 2800x(0.5)^X

175/2800 = 0.5^X

0.0625 = 0.5^X

log(0.5 x) = log(0.0625)

x · log(0.5) = log(0.0625)

-0.301x = -1.204

x = -1.204/-0.301

x = 4

8 0
3 years ago
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