The nail is made from iron, Fe. When iron combines with Oxygen, Fe2O3 forms. The weight of Fe2O3 is heavier than Fe.
Answer:
200 grams is the mass of 15% of the solution of lime that is formed by dissolving 30g of calcium hydroxide in water.
Explanation:
Mass of solution = M
Mass percentage of the solution of lime = 15%
Mass of lime or calcium hydroxide = m = 30 g
The Formula of mass percentage is given as :
On substituting the values in ab above formula :
200 grams is the mass of 15% of the solution of lime that is formed by dissolving 30g of calcium hydroxide in water.
Answer: Limestone is a sedimentary rock.
Explanation:
1. Limestone is a carbonate sedimentary rock made up of calcite(CaCO₃).This rock type forms calcareous shells and tests of organisms that was deposited in a sedimentary basin.
Limestone is used in building and construction works. It also finds application in chemical industries.
2. Over a long period of time, we would take a look at the rock "limestone" through the rock cycle.
Limestone being a sedimentary rock would be converted to marble, a metamorphic rock if subjected to metamorphic conditions over an extensive period of time. With series of metamorphic transformation, marble can grade to higher metamorphic facies of rocks as it combines with other minerals in the crust. The minerals would eventually change and as the changed rock approaches its melting temperature, melt would result.
From the other spectrum, limestone can be weathered if subjected extensively to denudation forces such as wind, water and glaciation. Water is more potent for the chemical weathering of limestone. Limestone would easily and readily dissolve in it over a long period of time.
Answer: Conservation of energy
Explanation:
The law of conservation of energy or the first law of thermodynamics states that energy cannot be created or destroyed but can be transformed from one state to another. It can be transformed from Potential energy to Kinetic energy, to chemical energy, to mechanical energy and so on.
In the case above the condensation of ADP an inorganic phosphate stored up 32kJ of energy as ATP (potential energy). The hydrolysis of ATP to ADP and inorganic also releases 32kJ of energy (kinetic energy) the same value of energy that was initially stored up. This means that energy is been conserved.