Answer:
atomic number
Explanation:
mass is determined by the protons and neutrons
Answer:
CHEMICAL CHANGE
Explanation:
Chemical reaction is synonymous to a chemical change. A chemical change is one which is not easily reversed and in which a new substance is formed.
The reactants are converted to products by the rearrangement of the constituent atoms to form a different compound.
Examples include burning of fuel, smelting of iron.
Physical change is different from chemical change as it involves a change of state or phase and the chemical properties of its constitients elements are intact. Unlike in chemical change where there is a change in the chemical properties of the new products formed
A. though conservation
C. through ecological restoration
D. by working toward sustainability to maintain diversity
Explanation:
The ecosystem is made up of the interaction between organisms and their immediate environments.
Humans acts as custodians of the ecosystem in a number of ways:
- through conservation: conservation is the process by which a resource is preserved. With increasing knowledge and better understanding of the ecosystem, humans have been able to conserve quite a number of key component of the ecosystem in several places on earth.
- through ecological restoration: in places that have lost their ecosystem productivity potential, humans have aided their restoration. An example is an abandoned mine converted to a resort.
- Humans are always constantly working towards sustainability to maintain diversity.
learn more:
Ecosystem brainly.com/question/7846024
#learnwithBrainly
Answer:
(a) Equation of reaction:
2Na + 2H20 = 2NaOH + H2
(b) 0.46g of sodium was used in the reaction
Explanation:
(a) 2 moles of sodium reacted with 2 moles of water to yield 2 moles of sodium hydroxide and 1 mole of hydrogen gas
(b) mass of hydrogen gas produced (m) = PVM/RT
P = 101.3kpa = 1atm, V = 246mL = 246cm^3, M = 2g/mol, R = 82.057cm^3.atm/gmol.K, T = 25°C = 25+273 = 298K
m = (1×246×2)/(82.057×298) = 0.02g of hydrogen gas
From the equation of reaction
2 moles (46g) of sodium produced 1 mole (2g) of hydrogen gas
0.02g of hydrogen gas was produced by (46×0.02)/2 = 0.46g of sodium
Answer:
O.2006 M
Explanation:
M1V1 =M2V2
M1 = M2V2/V1 =0.150M*32.1 ml/24.0 ml = 0.2006 M