Which equation represents the Pythagorean theorem, which can be used to find the magnitude of resultant vectors? R = A + B R = A x B R2 = A2 x B2 R2 = A2 + B2

What are fossils? What is the fossil record? Why is the fossil record important?

Which of the following best describes a double-replacement reaction? A. One compound splits up, forming two or more elements or new compounds. B. Atoms in one compound switch places with atoms in another compound. C.

What kind of ocean ecosystem did the author of this text ask questions about

Which of the following combination of elementary substances may react to form a chemical compound made up of molecules? - C (s) and Br2 (I) -I2 (s) and Mg (s) -O2 (g) and Na (s) - All of them react to produce compounds made up of molecules

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

Identify the element that chlorine forms a covalent bond with

A child pulls a sled up a snow-covered hill. The child does 405 J of work on the sled. If the child walks 15 m up the hill, how large of a force must the child exert?

A piece of glass with a mass of 32.50 g specific heat of 0.840 J/g*°C and an initial temperature of 115 °C was dropped into a calorimeter containing 57 g of water (specific heat 4.184 J/g*°C).

Which of the following is the most likely description of the product or products of a double-displacement reaction? A) one new compound B) two new compounds C) oxygen and energy D) one new compound and an element

A balloon is filled with 12L of air at a pressure of 2 atm. What is the volume of ballon if the pressure is changed to 3 atm?