8) In science lab, Sue estimated that there were 140 amoebas under her microscope, but there were actually 150. What was the percent error of her estimate?

A) 6.7%

B) 8.3%

C) 9.4%

D) 10%

Which group contains elements whose atoms have six electrons in their valence shell?

How is energy useful

What do scientists do that is the basis for their investigations

What structures allow plants to readily take up carbon dioxide from the atmosphere? (etext concept 26.1) ?

A rock at the top of a 30 meter cliff has a mass of 25 kg. Calculate the rock's gravitational potential energy when dropped off the cliff. Assuming that energy is conserved and there is no air friction and gravity is 9.8 m/sec.

Which of the following are correct statements? Check all that apply. A. A neutron is a neutral particle in the nucleus. B. A proton is a positively charged particle that orbits the nucleus. C.

What is the empirical formula for propene (C3H6) ?

Which substance, when dissolved in water, forms a solution that conducts an electric current

Room has a dimension of 10ft x 20 ft x 8 ft. What is the volume of the room in cubic yards if 1 yard = 3ft

Which of the following best describes a mixture in which ionic compounds are dissociated in solution? a. ion solution b. aqueous solution c. hydraulic solution d. hydrochloric solution