Answer:
The footprints of a dinosaur and the burrow of an ancient shrimp are examples of - Trace Fossils
Explanation:
A trace fossil or ichnofossil is defined as a geological record of biological activity. These provide us with indirect evidence of life in the past, such as the footprints, burrows, tracks, borings, etc that are left behind by animals, rather than the preserved remains of the body of the actual animal itself.
Answer:
Mass = 0.43 g
Explanation:
Given data:
Mass in gram = ?
Number of molecules of NiO = 3.45×10²¹
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
3.45×10²¹ molecules × 1 mol / 6.022 × 10²³ molecules
0.57×10⁻² mol
0.0057 mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 0.0057 mol × 74.69 g/mol
Mass = 0.43 g
A mixture that has component that can be easily separated is a heterogeneous mixture. The parts in the mixture remain physically separate. That means you can tell the parts apart and separate them very easily.
Final answer:- heterogeneous mixture
Balanced equation
2CO (g) + O2 (g) yields 2CO2 (g)
Stoichiometry
1 moles of Oxygen produce 2 moles of Carbon dioxide
Number of moles is proportional to Volume [same temperature and same pressure]
Then 2 liters of Oxygen produce 4 liters of carbon dioxide.
Answer C: 4.0 L
