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3 years ago

14

Fossils can be body parts of ancient organisms, or they can be traces. Give five examples of traces. Help this is due today!!!!!

7 grade

1 answer:

SSSSS [86.1K]3 years ago

6 0

Burrows, tracks, coprolites, nests and footprints are examples of traces that can be found in a fossil.

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A chemical engineer studying the properties of fuels placed 1.670 g of a hydrocarbon in the bomb of a calorimeter and filled it

tigry1 [53]

Answer:

856,68 J/gram

Explanation:

We know that the variaton of temperature of 1K is equal to 1°C

so if the ΔT is 3.55°C, it is 3.55K.

so

403 J - 1 K

x - 3.55K

X= 403 * 3.55 = 1430,65 J

1.670 g - 1430,65 J

1 g - y

y = $\frac{1430,65}{1.670}$ = 856,68 J

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3 years ago

Which of the following is the correct ( unbalanced) equation for the reaction that takes place when solid phosphorus combines wi

MA_775_DIABLO [31]

Answer: option A

P(s) + O2(g) --> P2O5(s)

Explanation:

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3 years ago

Calculate the number of atoms of sodium in a 4.5-gram sample

allochka39001 [22]

Answer:

1.18×10²³ atoms.

Explanation:

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ atoms.

From the above concept, 1 mole of sodium also contains 6.02×10²³ atoms.

1 mole of sodium = 23 g.

Thus,

23 g of sodium contains 6.02×10²³ atoms.

Therefore, 4.5 g of sodium will contain = (4.5 × 6.02×10²³)/23 = 1.18×10²³ atoms.

From the above calculation,

4.5 g of sodium contains 1.18×10²³ atoms.

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3 years ago

Why is it important to living things that water is bonded by h bond and not by covalent or ionic one

nexus9112 [7]

Because im pretty sure the molecules would just fall apart like salt which is ionic

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3 years ago

Cells, Cell Division)

zalisa [80]

Answer:

c is wrong

Explanation:

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3 years ago