All of the following describe work being done except:

A. standing in line to pay for groceries

B. putting bags of groceries down on a

counter

C. lifting bags of groceries out of the trunk of

a car

D. putting groceries away in the cupboard

Tetrachloromethane, CCl4, is classified as a (1) compound because the atoms of the elements are combined in a fixed proportion (2) compound because the atoms of the elements are combined in a proportion that varies (3) mixture because the atoms of

A mixture with medium sized particles that do not settle out is called

Burning charocal is that physical or chemical

The radius of a single atom of a generic element x is 197 picometers (pm and a crystal of x has a unit cell that is face-centered cubic. calculate the volume of the unit cell.

Whats a particles wave

Which of the following statements is true? Water is easily polluted because it can dissolve harmful chemicals O When water freezes, it contracts and becomes more dense.

What causes combustion in cars?

A potassium atom (atomic number 19) and a bromine atom (atomic number 35) can form a chemical bond through a transfer of one electron. The potassium ion that forms has 18 electrons. What best describes the bromide ion that forms?

A 0.450 g0.450 g sample of impure CaCO3 (s) CaCO3 (s) is dissolved in 50.0 mL50.0 mL of 0.150 M HCl (aq) 0.150 M HCl (aq).

Define and explain bond energy.