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2 months ago

Plants leaves are often preserved as?

1 answer:

7 0

Fossils are primarily found in sedimentary rocks, which are formed from the buildup of sediments such as sand or mud. Weathering factors, including wind, erode sediments from land and deposit them into bodies of water. Consequently, fossils of marine creatures are more prevalent than those of terrestrial creatures. Land-dwelling animals and plants that have been preserved are generally located in sediments within serene lakes, rivers, and estuaries.

The chances of any living organism turning into a fossil are relatively low. The transition from a living organic entity to a fossilized state is a long and roundabout process. Fossilization typically occurs under optimal conditions, where an animal or plant dies and quickly gets buried with moist sediment. This quick covering prevents consumption by other organisms or the natural decomposition caused by exposure to oxygen and bacteria. Soft tissues of plants and animals decompose much faster than their hard structures. Thus, teeth and bones are more likely to be preserved compared to skin, tissues, and organs. As a result, most fossils originate from a time span nearly 600 million years ago, when organisms began to evolve hard parts and skeletons.

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One cubic millimeter (mm3) of blood contains 7.0 x 106 red blood cells. How many red blood cells are in 1.0 L of blood?

Anarel [2989]

The problem provides a conversion factor---> 1 mm3= 7.0 x 10^6 RBC. Therefore, to determine the quantity of red blood cells in your sample, we must first convert Liters to cm3 using the conversion factor--> 1 mL= 1 cm3

I have shared how to resolve this issue.

7 0

1 month ago

If 3.18 x 10^23 atoms of iron react with 67.2 L of chlorine gas at STP, what is the maximum

Tems11 [2777]

84.34 grams of iron (III) chloride is the maximum produced since iron is the limiting reagent, and chlorine gas is in excess.

Explanation:

Balanced equation:

2 Fe + 3 Cl2 → 2 FeCl3

DATA PROVIDED:

iron = atoms

mass of chlorine = 67.2 liters

mass of FeCl3 =?

The number of moles of iron will be calculated as

number of moles = $\frac{total number of atoms}{Avagaro's number}$

number of moles = $\frac{3.18 x 10^23}{6.022x 10^23}$

number of moles = 0.52 mol of iron

moles of chlorine gas

number of moles = $\frac{mass}{molar mass of 1 mole}$

Substituting the values into the equation:

n = $\frac{67200}{70.96}$ (molar mass of chlorine gas = 70.96 g/mol)

= 947.01 moles

As iron is the limiting reagent therefore

2 moles of Fe lead to 2 moles of FeCl3

0.52 moles of Fe will yield

$\frac{2}{2}$ = $\frac{x}{0.52}$

0.52 moles of FeCl3 is produced.

To express this in grams:

mass = n x molar mass

= 0.52 x 162.2 (molar mass of FeCl3 is 162.2g/mol)

= 84.34 grams

3 0

2 months ago

What volume of gold would be equal in mass to a piece of copper with a volume of 141 ml? the density of gold is 19.3 g/ml; the d

alisha [2963]

We need to calculate the volume of Gold, assuming its mass matches that of copper.

Given information:

Density of Copper = 8.96 g/ml.
Volume of Copper = 141 ml.
Mass of Gold = Mass of Copper.
Density of Gold = 19.3 g/ml.

To find copper's mass, we use the density equation:
Density = mass/volume.

To find mass of copper:
Mass of copper = Density of Copper * Volume of Copper.
Mass of copper = 8.96 g/ml * 141 ml = 1263.36 g.
Thus,
Mass of gold = Mass of copper = 1263.36 g.
Now, using the density formula for gold to get its volume:
Volume of gold = Mass of gold / Density of gold.
Volume of gold = 1263.36 g / 19.3 g/ml = 65.46 mL.

Consequently, the volume of gold required to match the mass of copper is 65.46 mL.

8 0

2 months ago