Arrange the following measurements, in seconds, from least bias to the greatest bias.

6.63+/-0.01, 6.6+/-0.1, 6.52+/-0.05, 6.4+/-0.5

Given the propane molecule C3H8 (g) ! a) What is the balanced equation for the combustion of propane in O2? (20 pts.) b) What is the standard enthalpy change ΔH0 for the reaction at 25°C? (20 pts.

One mole of the acid HCl requires how many moles of OH - for neutralization?

Which product of the ultraviolet decomposition of cfcs acts as the catalyst for ozone decomposition?

A proton is a hydrogen atom without its electron? True False

Our Earth cycles through day and night regularly. This cycle allows us to have a way to keep track of time and schedule our daily lives. Most of our activities and interactions occur during the day and most of our sleeping occurs at night.

How do the different spheres of Earth interact? Volcanic eruptions are natural phenomena in the. They sometimes erupt, spilling out lava and dust. The lava solidifies, forming new landmasses.

Differentiate between mass, volume, and density. Explain why only changing the shape of an object would have no effect on its density.

Describe the properties of noble gases. Based on their electronic arrangement, explain whether they can exist alone in nature.

In the reaction 2k + 2h2o → 2koh + h2, which compound has an element ratio of 2 : 1? h2o h2 k koh

Describe with sketches how electrons are transferred during ionic bonding for: (a) Lithium Bromide (LiBr) (b) Potassium Bromide (KBr) (c) Lithium Chloride (LICI)