Các oxit kim loại kiềm thổ có khả năng hút ẩm mạnh là do: A. khả năng biến vị của electron hóa trị
B. bán kính nguyên tử lớn
C. năng lượng hydrat hóa lớn
D. năng lượng mạng lưới tinh thể lớn

Apump contains 0.5 l of air at 203 kpa.you draw back on the piston of the pump, expanding the volume until the pressure reads 50.8 kpa. what is the new volume of the air pump

Element before carbon on the periodic table

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.