Which of the following is a valid method for reducing the atmospheric amount of greenhouse gases? 1 . Reduce the use of chemicals in the stratosphere that destroy ozone. 2 . Reduce the use of alternative sources of fuel such as solar energy. 3 . Reduce the amount of fossil fuels burned by cars. 4. Reduce the amount of acid rain in the sky by altering the patterns of clouds.

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both

The concentration of ionic substances is important for the heart to beat. your heart responds to electrical impulses that travel through heart cells that are made up mostly of water. which properties of ionic compounds are important to support this function? solubility in water conductivity crystalline melting point

Can anyone explain 1. review your spectrometry data and use the known elements to identify the star's composition. which unknown elements make up this star? justify your element selections. 2. in parts i and ii of the lab, what happened to the electrons of each element to produce the different colors of light? explain your answers using important terms from the lesson and information provided in the laboratory. 3. stars composed of heavier (more massive) elements are often slightly older than stars made predominantly from hydrogen and helium. based on your data, is the newly discovered star a younger star? explain your answer.