1. What are pollen grain? 2. what is an embryo?

When a chemical reaction occurs,

Alculate the density of a substance for which 4.78 x 106 l of the substance has a mass of 1.5 x 107 kg. express your answer using the correct number of significant figures, and do not enter your answer using scientific notation.

At 65 degrees celsius, which compound has a vapor pressure of 58 kilopascals? 1. ethanoic acid2. ethanol 3. propanone 4. water

Why do densities of haloalkanes decrease when the size of alkyl group increases? when the alkyl grp increases, the van der waals force between polar molecules becomes stronger, so shouldnt the molecules pack closer to each other and the density

Which of these statements are true? Check all that apply. A. Elements that produce radiation for a long time have a slow decay rate. B. Half of the time until a substance is completely gone is the half-life. C.

How many covalent bonds can each carbon atom form?

Hich element is likely to be the most brittle? a. selenium b. cobalt c. platinum d. zinc

What units should they have used in order to make the correct conversion

The brown solid that formed is zinc copper oxygen iron

a solution is approximately 332.0 g of salt per kilogram of solution. Assume this salt is all NaCl. What is the molality of this solution?