Students in Ms. Alvarez's eighth grade science class are investigating how temperature, in degrees Celsius (°C), affects the solubility of a compound in
100 milliliters (mL) of water. Ms. Alvarez provides the students with a graph that
shows the solubility of a certain compound, as shown below.
SOLUBILITY OF A COMPOUND
160
140
120
100
Compound Dissolved (g)
80
60
40
20
0
10
60
70
20 30 40 50
Temperature (°C)
She then tells the students that she will demonstrate how many grams (g) of the
compound will dissolve in 100 mL of water at 40°C. Based on the information in the
graph, which of the following is the best prediction of how many grams of the
compound will dissolve at 40°C?
40 g
65 g
0859
100 g

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.

hi my name is ashlynn and im 15

these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.

oxygen is the first element in group 16 (via) of the periodic table. the periodic table is a chart that shows how chemical elements are related to each other. the elements in group 16 are said to belong to the chalcogen family. other elements in this group include  sulfur, selenium, tellurium,  and  polonium.  the name chalcogen comes from the greek word  chalkos,  meaning "ore." the first two members of the family, oxygen and sulfur, are found in most ores.

oxygen is by far the most abundant element in the earth's crust. nearly half of all the atoms in the earth are oxygen atoms. oxygen also makes up about one-fifth of the earth's atmosphere. nearly 90 percent of the weight of the oceans is due to oxygen. in addition, oxygen is thought to be the third most abundant element in the universe and in the solar system.