The variable that is observed during an experiment is called what type of variable?

When 1.0 mole of fe (s) reacts with excess o2 (g) and 0.325 moles of fe2o3 are produced. what is the %yield of fe2o3?

Describe one likely result if the placenta became damaged and could not maintain progesterone levels

A box experiences a force of 2 N to the left and 3 N to the right. Which is true of the box's motion? A) The box will slow down. B) The box's velocity will be 1 m/s. C) The box's velocity will not change. D) The box will experience acceleration.

When carbon undergoes sp2 hybridization it forms

Predict the spontaneity of a reaction (and the temperature dependence of the spontaneity) for each possible combination of signs for? H and? S (for the system).

Which item takes the most amount of water to produce

1. Which of the following two ingredients can combine to make a compound? a. Salt and water b. Hydrogen and oxygen c. Eggs and butter d. Sugar and water 2.

What are two ways climate can influence weathering?

A light has a wavelength of 4.10*10^12m. What is the Frequency?

If a compound has a molar más of 180g/mol and it's empirical formula is CH^2O, what is it's molecular formula?