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Andrej [43]
3 years ago
9

These were formed hundreds of millions of years ago from remains of living organisms and before the time of the dinosaur._______

___________________
a. fossil fuels
b. minerals
Chemistry
1 answer:
Alex787 [66]3 years ago
5 0

Answer:

Fossil Fuels

Explanation:

  • Fossil fuels are formed hundreds of millions of years ago from remains of living organisms and also before the time of the dinosaur.
  • Mostly these fossil fuels are formed when an organism dies and their bodies are burried.
  • Many different processes i.e physical and chemical occurs which create fossils.
  • The bodies of organisms are buried with sediment. As time passes,the sediment turns into sedimentary rock.
  • Carbonization or distillation are the processes that tells a detailed carbon impression of dead organisms in sedimentary rock.
  • Permineralization is the common method of fossilization.
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How can rocks be distinguished from each other?
marysya [2.9K]

Answer:

Different types of rocks have different chemical composition.

Explanation:

Rock can be distinguished from each other by their chemical composition which is a product of the minerals they contain.

  • A rock is an aggregate of minerals.
  • Different suites of rocks have their inherent mineralogical composition and facie.
  • This is because, these rocks form under different types of conditions from time to time.
  • Igneous rocks form from molten rocks, sedimentary rocks form from pre-existing rocks and metamorphic rocks for under elevated temperature and pressure conditions.
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5 0
3 years ago
a 125-mL sample of liquid has a mass of 0.16kg. What is the density of the liquid with the proper number of significant figures?
natita [175]

The density of the liquid is 1.3 g/mL.

The mass of the liquid is 0.16 kg = 160 g.

The volume of the liquid is 125 mL.

Density = mass/volume = 160 g/125 mL = 1.3 g/mL

3 0
3 years ago
Read 2 more answers
A 8.249 gram sample of copper is heated in the presence of excess fluorine. A metal fluoride is formed with a mass of 13.18 g. D
levacccp [35]

Answer:

CuF_2 the empirical formula of the metal fluoride.

Explanation:

Mass of copper heated = 8.249 g

Mass of copper fluoride formed = 13.18 g

Mass of fluorine gas in copper fluoride = x

13.18 g = 8.249 g + x\\x= 13.18 - 8.249 g = 4.931 g

Moles of copper :

= \frac{8.249 g}{63.546 g/mol}=0.1298 mol

Moles of fluorine:

= \frac{4.931 g}{18.998 g/mol}=0.2596 mol

For the empirical formula divide the smallest mole of an element with all the moles of elements present in the compound.

Copper= \frac{0.1298 mol}{0.1298 mol}=1\\Fluorine = \frac{0.2596 mol}{0.1298 mol}=2

The empirical formula of the copper fluoride = CuF_2

CuF_2 the empirical formula of the metal fluoride.

6 0
3 years ago
Consider the molecules H2O, H2S, H2Se, and H2Te. Which do you expect to have the highest boiling point, and why?
STatiana [176]

Answer:

a. H20,because it experiences hydrogen bonding.

5 0
3 years ago
A canoe dragged across the shoreline is what type of friction
meriva

sliding friction because your canoe is sliding across the sand

7 0
4 years ago
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