What do scientists use to describe chemical reactions?

a. laws and theories

b. synthesis

c. the conservation of matter

d. chemical equations

How many moles are equal to 28 grams of CaCO3

Rapid, uncontrolled cell division of abnormal cells is characteristic of sex cells cancer growth sexual reproduction

When the equation below is completely balanced, what will be the coefficient for Fe2O3?

Two substances have different physical and chemical properties. Both substances have molecules that contain two carbon atoms, one oxygen atom, and six hydrogen atoms.

Which formula represents a non polar molecule with polar covalent bonds

Which statement is true at STP? (The atomic mass of Zn is 65.39 u.)

A sample of gas has a volume of 2.4 L and a pressure of 1.2 atm. What would the pressure of the same gas sample be if the volume is reduced to 1.8L at a constant temperature?

The elements most likely to form more than type of ion are the ... A. Transition metals B. alkali metals C. halogens D. alkaline earth metals

Mole-Mass Conversions How many moles in 28. o grams of Oxygen? What is the mass of 5.0 moles of Iron? Find the number of moles of argon in 452 g of argon. Find the grams in 16.5 mol of Hydrogen.

What is equal solute concentration inside and outside of the cell so water moves at equal rates?