Which of the following is used to calculate the distance to a star based on subtle shifts in the star's position relative to an observer on Earth

What is the overall reaction order for this rate law: rate = k[a][b]?

1a) consider the mixed aldol condensation reaction of 1-methylcyclopentane-1-carbaldehyde (shown below) and 3,3-dimethyl-2-butanone (shown below) in the presence of sodium hydroxide.

What is the simplest whole-number ratio of atoms in a molecule or formula unit called?

List the five characteristics a substance must have to be a mineral. Explain why coal and a glass marble are not minerals. (This is chemistry right?)

Cinnabar is an ore of mercury that contains only Hg and S. When a 0.350 g sample of cinnabar is heated in oxygen, the ore decomposes completely to yield 0.302 g Hg metal. What is the empirical formula of cinnabar?

A sample of bismuth weighing 0.687 g was converted to bismuth chloride by reacting it first with HNO3, and then with HCI, followed by careful evaporation to dryness. The mass of the bismuth chloride obtained was 1.032 g.

When 1 g of sodium chloride (NaCl) is placed in 100 g of water, a solution results. Once the solution is prepared, water is now considered what part of the solution?

1. How is pressure affected as depth increases? 2. As the sun heats the surface of the oceans, two layers of water result. What separates the layers? 3. How is temperature affected when? (a) the depth increases (b) the latitude increases 4.

Are nails in a jar with water a chemical change

What is the molarity of a solution composed of 4.73 g of potassium iodide (KI) dissolved in enough water to make 0.169 L of solution? Answer in units of M.