Which is bigger km, m, cm, mm

How does a pulley system achieve a mechanical advantage?

To convert between moles and molecules, you need to ... a. use Avogadro's number as a conversion factor b. use molar mass as a conversion factor c. use molar volume at STP as a conversion factor d.

What is the acid level of oxygen?

A rock is dropped into a graduated cylinder containing 40mL of water. the new volume is 47mL. What is the volume of the rock? a) 4ml b) 47ml c) 7ml d) 87ml e) 11ml I thibk it is 7ml am I correct?

In which time period did Ancient Greek philosophers propose that all matter was composed of four fundamental substances: earth, air, water, and wind? 8000 B. C. - 1000 B. C. 1000 B. C. - 450 B. C. 300 B. C. - 1400 A. D. 1774 - 1794 A. D.

What is the molar mass of the following substance : Cs2CO3

What does the velocity of a wave describe

Sulfur (S) has 16 protons and 16 neutrons. How many electron shells does an element of sulfur have?

Which one of the following statements about orbital energies is incorrect? A) The energy of a given orbital increases as the nuclear charge Z increases. B) In many-electron atoms the energy of an orbital depends on both n and l.

When solid lead (II) sulfide ore burns in oxygen gas, the products are solid lead (II) oxide and sulfur dioxide gas.? A. write the balanced equation B. how many grams of oxygen are required to react with 29.9 grams of lead II sulfide? C.