Which of these is an element?

A) air

B) Carbon dioxide (CO2)

C) water (H20)

D) carbon (c)

Ammonium nitrate is an ingredient in cold packs used by sports trainers for injured athletes. Calculate the change in temperature when 42 g of ammonium nitrate (NH&NOs, 80.1 g/mol) dissolves in 250 g water.

Explain how an automobile air bag protects the people in the car from being hurt as a result of impact

Which of the statements is a postulate of the kinetic molecular theory of gases? The average kinetic energy of the gas particles is inversely proportional to the square of the absolute temperature of the gas.

Which is a major function of diffusion in cells

If the pH of a solution is 12.2, what is the pOH?

What controls the amount of light that enters the eye?

The universe contains billions of galaxies, each containing billions of stars. True or false

How is measuring the volume of liquids different than measuring the volume of regular-shaped solids?

Which of the following best describes the motion of the particles in a piece of steel?

Student follow up The ionic equation for the reaction between zinc and sulfuric acid is. Zn (s) + 2H (aq) - - Zn" (aq) + H2 (g) a State what has been oxidised in this reaction. Explain your answer in terms of electrons.