Viết phản ứng hóa học chứng minh đồng là kim loại hoạt động mạnh hơn bạc

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.

How many moles of no2 will form when 3.3 moles of cu are reacted with excess hno3?