Which of these is an element, oxygen, sodium chloride, water, or air

This is how krypton appears in the periodic table. A purple box has K r at the center and 36 above. Below it says krypton and below that 83.80. Rounded to the nearest whole number, how many protons are in an atom of krypton? 36 48 84 120

When iron sulfide (FeS) is combined with hydrogen chloride (HCl), a gas is formed in a double-displacement reaction. Which gas would it be? A. FeS, B. FeH, C. H2S, D. H2Fe

True or False? All mixtures are solutions.

What structures allow T cells to locate and destroy invaders? O A. Macrophages O B. Pathogens O C. Lymph O D. Antibodies

Determine the number of representative particles in each of the following. 0.264 mol silver 7.95 * 10^-3 mol sodium chloride 44.4 mol carbon dioxide 0.352 mol nitrogen (N2)

For a solar eclipse to occur,

How many times does the citric acid cycle occur for each molecule of glucose?

Which planet is made of mostly gas

What is the molar mass of al (clo2) 3

Neon belongs to what family