The density of mercury is 13.5 g/mL and the density of water is 1.00 g/mL. If a mercury barometer reads 677 mmHg, what is the barometric pressure in cmH2O?

Which situation is an indication that a chemical change has occurred?

10 Given the balanced ionic equation representing a reaction: Zn (s) + Co2 + (aq) → Zn2 + (aq) + Co (s) Which statement describes the electrons involved in this reaction? A) Each Zn atom loses 2 electrons, and each Co2 + ion gains 2 electrons.

Decide which element probably has a density most and least similar to the density of strontium. Comnarina density.

A geologist discovered fossils of marine animals in a layer of sedimentary rock in the desert. Based on this discovery, what conclusion can the geologist draw?

A 4.10-mole sample of helium gas at 28°C takes up a volume of 3.28 L. Determine the pressure of helium in units of atm.

In which era did the first fish appear? a. Carboniferous b. Paleozoic C. Mesozoic d. Permian

How are electrons excited and what happens when the electrons relax

What is the molarity of a solution that is made by dissolving 3.68 g of sucrose (c12h22o11) in sufficient water to form 275.0 ml of solution?

A straight line on a speed-time graph means the speed is constant. this means the speed is not changing over time. how is this different from a distance from a distance-time graph?

Why is it important for an art conservation scientists to study the properties of a painting before it is repaired