A student estimated a mass to be 250 g but, upon carefully measuring it, found the value to be 240 g. What is the percent error of the estimated mass if the measured value is the accepted one?

A. 4.0%

B. - 4.2%

C. - 4.0%

D. 4.2%

Which of the following statements best describes the biosphere? A) it is a mixture of gases that contain dust particles B) it contains earths metal core C) it contains all of earths water D) it is part of earth that contains living organisms

What is the change in temperature in a 128g sample of water if it absorbs 2808J of heat energy at a temperature of 2°C?

What volume of 6.00 m naoh would be required to increase the ph to 4.93?

What is a solid solution of a metal or nonmetal dissolved in a metal called?

This star of matter has a definite shape and a definite volume

Which of the following is a characteristic of nonmetals? a. nonmetals are often shiny and hard. b. nonmetals are often malleable. c. Nonmetals do not conduct electricity. d. nonmetals are often ductile.

How does a change in temperature affect the kinetic energy of the particles in a reaction?

Which characteristic best identifies an Arrhenius base

Which statement correctly describes why a compound is a pure substance? O A compound is not a pure substance because each of its molecules is m elements A compound is a pure substance because its molecule cannot be broken O A compound is not a pure

What negative impact did chemistry have on society through the production and use of chlorofluorocarbons?