Are watches considered as compound machines?

A) How much CO is required for the production of Fe from 1000 tonnes of magnetite (Fe2O4). Assume that the iron ore is 100% pure.

A photon has 8.0 * 10-15 J of energy. Planck's constant is 6.63 * 10-34 J•s. What is the frequency of the photon

An object that is more dense than the fluid it is immersed in will do what?

A sample of gas occupies 280. mL when the pressure is 560.00 mm Hg. If the temperature remains constant, what is the new pressure if the volume changes to 560.0 mL?

B. A radioisotope of radium-229 undergoes beta decay. Write the decay reaction showing this process.

What is a compound? a) a combination of two or more substances that are not chemically combined b) a combination of two or more elements that are combined in a certain ratio

A gas has a volume of 75mL at a pressure of 200.0 kPa. What will be the new volume be in mL if the pressure is decreased to 60.0 kPa in sig figs

Give two reasons why it's important to work with a partner in a lab

Suppose you have 3.00*1018 reams of lead (pb). how many lead atoms do you have? express the number of atoms numerically.

Why is a chemical indicator added to the flask in which a titration will occur? to show when enough base has been added to determine the starting pH of the solution to neutralize the acid before adding the base to identify the starting volume of