Courtney drives for 30 minutes at 50 mph

and for 1 hour at 40 mph. How far has he

traveled altogether?

What is an example of a chemical change? A. water evaporating from a puddle B. cloth tearing when pulled C. wood forming sawdust when cut D. bread baking in an oven

How does a purebred individual differ from a hybrid individual?

What is the change in enthalpy of the following reaction? 2NaBr (aq) + PbCl2 (aq) 2NaCl (aq) + PbBr2 (aq) Given: NaCl: ∆H = - 411 kJ NaBr: ∆H = - 360 kJ PbCl2: ∆H = - 359 kJ PbBr2: ∆H = - 277 kJ

Explain why you hear a "woosh" sound when you open a can containing a carbonated drink. Which gas law applies?

What observation led Marie Curie to discover radium and polonium?

Which atomic particle dtermines the chemical behaviour of an atom?

If you could travel to the Sun and back, about how far would you travel? A. 1 AU B. 2 AU C. 5 AU D. 10 AU

A scientist is conducting a descriptive experiment where she is monitoring sea level along coastal towns in California. What is a major benefit of this experiment? The relationship shows cause and effect. It is repeatable.

If the sum of the mass of the reactants is 12.5 what would be the sum of the products be? And explain how you know this

Name 5 types of alloys