4. For a reaction to occur, energy must be_

__ to break chemical bonds.

What is the molarity of a solution that contains 612 grams of CaCl2 in 3.04 liters of solution? 1.81 M 201 M 5.52 M

A gas absorbs 10J of heat and is simulataneously comptessed by a constant external pressure of 0.5atm from 4L to2L in volume. What is change in the internal energyA. 101J B. 111J C. 2J D. None of the above

When 8.21 l of c3h8 (g) burn in oxygen, how many liters of oxygen are consumed? all gas volumes are measured at the same temperature and pressure but not at stp?

Calculate the ph of a solution formed by mixing 65 ml of 0.20 m nahco3 with 75 ml of 0.15 m na2co3.

How does the number of protons in an atom compare to the number of electrons in an atom?

1. Which of the following best describes an example of pure chemistry? a) testing the effects of lower concentrations of a drug on humans b) studying chemicals containing carbon c) developing a cure for osteoporosis d) finding an antidote for a new

Problem 1: For which of the following activities might you want to hire a chemist? A. building a garage B. testing a sample of water from a well C. finding a comet D.

Why do most living things need food water and the ability to get rid of waste?

What is the effect of adding more water to the following equilibrium reaction? CO2 + H2O - > 2H2CO3

What aldol product is formed when two molecules of butanal react together in the presence of base?