The right option is; a pure substance and an element.
A piece of sodium metal can be described as a pure substance and an element.
Sodium is a chemical element with an atomic number of 11. Sodium is a soft, waxy, silvery, highly reactive metal. Sodium belongs to group 1 of the periodic table and it is highly abundant in the earth’s crust. Sodium can also be found in various minerals such as rock salt, feldspars and sodalite.
This is an example of competition because the plant is releasing the chemical in order to kill off the other nearby plants that may be competing and fighting for the water and nutrients in the soil in order to survive. The plant species releasing the chemical will kill the nearby plants, rather than benefit them. Therefore, it cannot be mutualism. The plant species is also not working together with the nearby plants by killing them. It also cannot be cooperation or working together.
Answer:
26.5°C
Explanation:
Heat added is the product of mass, specific heat capacity, and change in temperature.
q = mC(T − T₀)
25.7 cal = (18.4 g) (0.215 cal/g/°C) (T − 20.0°C)
T = 26.5°C
Answer:
P2 = 150.4 KPa
Explanation:
Gay-Lussac's Law:
at constant volume, the pressure of a gas varies directly with the temperature
∴ P1 = 55 KPa
∴ T1 = - 100.0°C ≅ 173 K
∴ T2 = 200°C ≅ 473 K
⇒ P2 = ?
⇒ P2 = (473 K)(55 KPa) / (173 K)
⇒ P2 = 150.4 KPa
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