Answer:
Retrograde Motion
Explanation:
Geocentric model of planets was proposed by Ptolemy. It stated that all sun, planets and stars revolve round the earth in circular orbits.
NOTE: Ptolemy: an ancient astronomer, geographer, and mathematician who considered the Earth the center of the universe (the "Ptolemaic system").
ima say A because- the amount of reactants and product do not change is always true for a chemical reaction that has reached equilibrium. Chemical reaction at equilibrium occurs when reactants and products are present in a concentration and have no further tendency to change with time.
<u>Answer</u>:
Organisms living near hydro-thermal vents get their energy from Sulphur.
<u>Explanation</u>:
The hot springs found near the Underwater volcanoes at convergent plate boundaries and spreading ridges are called as Hydro-thermal vents . The organisms that live near these hydro-thermal vents are capable of living in very hot water that has a temperature of 65°C to 100°C that would kill most surface organisms.
Also, organisms present at depth of the hydro-thermal vent are adapted to very high and extreme pressure. The water in this vent are very rich in Hydrogen Sulphide .This hydrogen sulphide has very rich amount of energy. Although the is toxic, the bacteria and other living organism are adjusted themselves to make use of the energy in the Hydrogen sulphide.
Answer:
Combustion – substance reacts with oxygen often producing heat and light. Oxygen is ALWAYS one of the reactants. ... CH4 + 2O2 → CO2 + 2H2O Incomplete combustion – carbon monoxide and water.
Explanation:
(A) 14.8 g → 1.48 × 10^7 µg
The prefix µ means “× 10^(-6)”, so 1 µg = 1 × 10^(-6) g
The conversion factor (CF) = 1 µ g/1 × 10^(-6) g
∴ Mass = 14.8 g × [1 µg/1 × 10^(-6) g] = 1.48 × 10^7 µg
(B) 3.72 g → 3.72× 10^(-3) kg
The prefix k means “× 10^3”, so 1 kg = 1 × 10^3 g
CF = 1 kg/1 × 10^3 g
∴ Mass = 3.72 g × [1 kg/1 × 10^3 g] = 3.72× 10^(-3) kg
(C) 7.5 × 10^4 J → 75 kJ
CF = 1 kJ/1 × 10^3 J
∴ Energy = 7.5 × 10^4 J × [1 kJ/1 × 10^3 J] = 3.72× 10^(-3) kJ = 7.5 × 10^1 kJ
= 75 kJ