As scientists search the universe for signs of life on other planets they are likely to focus on the presence of molecules containing which of the following elements?

A. carbon

B. calcium

C. iron

D. magnesium

Which of the following changes will decrease the rate of collisions between gaseous molecules oftype A and B in a closed container? A. decrease the volume of the container B. increase the temperature of the system C. add A molecules D.

A Potassium (K) atom attains a stable electron configuration when it combines with. one chlorine atom two chlorine atoms one calcium atom two calcium atoms

Which equation agrees with the ideal gas law?

Sodium is a metal m, like copper. Suggest reasons why sodium cannot be used in electrical wires.

Which of the following is true about folded mountains? They are formed with a cone on top. They form at convergent boundaries. They don't result from moving geologic plates. They form when magma breaks through the surface.

What is the molar mass of Cu3 (PO4) 2?

What is the theoretical yield of so3 produced by the quantities described in part a? express your answer numerically in grams?

What would seasons be like if the revolution around the sun took 2 years

Which of the following is true about all electromagnetic waves in a vacuum? a. they all carry the same energy. b. they all travel at the same speed. c. they all have the same frequency. d. the all have the same wavelength.

The model of the atom where the central core contains protons and neutrons surrounded by a cloud of electrons is best described as A) The Bohr model of the atom. B) The modern model of the atom. C) The plum pudding model of the atom.