How has the expansion of the universe affected the cosmic microwave background radiation? A. It has caused it to red-shift.
B. It has caused it to blue shift.
C. It has caused it to cool.
D. It has caused it to heat up.

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

Un cierto gas tiene un volumen de 800ml a 80°c y 600ml a 80°c y 600mmhg de presión. ¿cual será el volumen del gas a condiciones normales? sí el gas es oxígeno, ¿cuál será su peso? y ¿cuántas moléculas están presentes en el sistema?

Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.