A flask contains 0.450 mol of liquid bromine, br2. determine the number of bromine molecules present in the flask.

Match the following items. 1. balance observation using "how much". 2. graduated cylinder primary unit of mass. 3. hypothesis proposed explanation. 4. L unit of volume. 5. quantitative instrument of volume. 6. kg instrument of mass. 7.

Describe the physical properties of each state of matter

A metal entrance door swings freely in the winter, but when the weather turns warm, the door sticks and seems too big for the doorframe. Using your knowledge of particle theory, explain what is happening.

PbSO4 → PbSO3 + O2 Balance the equation

Determine the mass number of an element that contains 26 protons, 22 electrons, and 30 neurons

Complete and balance the molecular equation, including phases, for the reaction of aqueous ammonium bromide, nh4br, and aqueous lead (ii) acetate, pb (c2h3o2) 2.

A magnesium atom has 2 valence electrons in its third shell. Which is a TRUE statement about what happens when it forms an ion? A. It will be an anion. B. It will have more electrons than protons. C.

What scientific discoveries led to changes in Dalton's atomic theory?

What does berkelium react with

Classifying living things