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

Is aluminum a liquid at 1000 kelvin

What is the trend in first ionization energies as one moves across the fourth period from k to kr? what is the trend in first ionization energies as one moves across the fourth period from to?

Consider a generic redox reaction? Consider a generic redox reaction X (s) + Y^ + (aq) X^ + (aq) + Y (s) then suppose that the coefficients in the redox reaction are doubled.

This chart shows the experimental design of four students who are all observing what kind of bird seed birds tend to eat more often Student 1 Student 2 Student 3 Student 4 - Performed the - Repeated the - Repeated the - Repeated the experiment

Which of the following is not true about the importance of the carbon cycle to living things? a. Plants use carbon dioxide to make energy. b. Carbon is the second most abundant molecule in organisms. c.

Whats the answer to 7/2 * 1/5?

Which statement correctly describes the relationship between reactant and yield? The actual yield is calculated from the amount of the excess reactant present. The actual yield is calculated from the amount of the limiting reactant present.

Balance the following reaction. Leave the box empty if no other coefficient is needed. C2H5 + O2 → CO2 + H2O

What three human body systems coordinate cause an arm to move

Which statement does NOT apply to Alkenes? They readily react They have double bonds They are more stable than alkanes They are unsaturated