The basic unit of structure and function in all living things is the

nucleus.

atom.

cell.

organelle.

How could you separate items that are different densities? explain

Fossil fuels are made fromA. inorganic matter. b. minerals. C. water and gases. d. plants and animals

0710 A missile is flying at a speed of 125 m/s. If the missile has a mass of 125 kg, what's its kinetic energy? Keep 4 significant figures.

Describe how chemical energy is related to chemical change.

Calculate the number of moles of C2H6 in 4.11*10234.11*1023 molecules of C2H6. Express your answer using three significant figures.

How many milliliters of a 0.7% stock solution are required to make 2 l of 0.2% solution? how many ml of solvent will be required to carry out the dilution?

What percentage of the naphthalene molecules emitted a photon?

In an endothermic reaction, heat is absorbed from the surroundings. How does this affect entropy? A. The particles in the surroundings move slower and have decreased entropy. B.

The temperature of a sample of liquid water changes from 50°C to 30°C. Which statement best explains the change that must happen at the molecular level? A. The molecules move more quickly and their average kinetic energy increases. B.

The most important reason why solid sodium hydroxide is not used as a primary standard is