What is the final temperature when 20.0 g of water at 25°C is mixed with 30.0 g of water at 80°C?

If.the standard enthalpy of formation of H2O(l) is -286 kJ/mol, which one of the following equations represents the formation reaction of H2O?  

Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid.LiOH(aq) + HBr(aq) → H2O(l) + LiBr(aq)

Select the best statement relating to the following reaction: 2MnO2(s) + KClO3(aq) + 2KOH(aq) → 2KMnO4(aq) + KCl(aq) + H2O(l)

A 5.0 kg crate is on an inclined ramp that makes an angle of 30. degrees with the horizontal.  If the coefficient of static friction is 0.50, what is the minimum force needed to hold the crate at rest?

A useful method of expressing very large or very small numbers is 

There is an uncertainty (i.e., error) associated with every measurement. 

A race car begins the race with an acceleration of m/s2 for s.  What speed does the car reach at the end of this time interval, in meters/second?

The drag force is independent of the velocity of the object.

If the slope on a position vs time graph is a straight, horizontal line, the object is