Which of the following terms refers to areas of gas on the on the suns surface that are cooler than the gases around them

A block of aluminum is dropped into a graduated cylinder with an initial volume of water at 75mL and the volumes rises to 90mL. If the block has a mass of 40.5 g what is its density?

Which of the following elements is most likely to form an ion that will then form an ionic bond with an ion of a Group 1A element? A) Pt B) I C) Fr D) Be

Helium (he) has an atomic number of 2. it is chemically stable because it

What is the concentration of hydroxide ions in pure water at 30.0c, of kw at this temperature is 1.47 x 10-14?

What usually happens to the rate of reaction when the concentration of one of the reactants is increased

Which of the following is not a producer? Mushroom Tulip Grass Pine Tree

Phosphorus forms a number of oxohalides, x3po, in which x may be a f, cl, or br atom. the most common of these, phosphoryl chloride, is obtained as follows:

Which statement is true about the speed of light waves in a medium? a. Depends on the temperature of the light wave b. Decreases with a decrease in density of medium c. Decreases with an increase in density of medium d.

What's a certain indicator that a molecule is polar? the molecule has a nonpolar covalent bond and the dipole is cancelled due to symmetrical arrangement of atoms the molecule has a polar covalent bond and the dipole is cancelled due to symmetrical

In the synthesis of barium carbonate from an alkali metal carbonate (M2CO3 where M is one of the alkali metals) a student generated 3.7 g of barium carbonate from 2.0 g of their alkali metal carbonate.