A= (99x1+0,8x2+0,2x3)÷100%=1,012
1,012≈1
Answer:
Electronegativity increases left to right across a row in the periodic table e.g. C < N < O < F<. b
Answer:ThE aNsWeR iS B
Explanation: The earth was one a big ocean but than volcanoes explode and that created land :)
Answer: Convection Currents
Explanation: The mantle rock is solid and denser because it is cooler. This means it will sink closer to lower mantle as warmer, lense dense rock/magma moves upwards.
Answer: There no chemical change, but there is a physical change.
Reason: When a substance dissolves in water, the substance retains its molecular identity and simply mixes throughout the water