Which will decrease the rate of a reaction? a. changing the temperature from 90ºc to 40ºc b. adjusting the concentration from 30 ng to 60 ng c. placing the substance in a smaller container d. grinding the substance into a powder

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li