Living organisms make their own carbon

What is the oxidation number of the element n in the compound n2o5? 1. 3 2. 6 3. 5 4. 2 5. - 6 6. 4 7. - 2 8. - 3 9. - 5 10. - 4?

Which elements on the periodic table have the highest ionization energies? A) Nonmetals in the upper right B) Metals in the lower left C) Metalloids, in the center D) Synthetic elements at the bottom

Which of the following is not a reason to use an alloy instead of a pure metal? Brass is more malleable that pure copper. Sterling silver is stronger than pure silver. Cast iron is more brittle than pure iron. Bronze is tougher than pure copper.

Why does some friction occur with seemingly smooth surfaces?

Is there ny way to predict the exact location of any one marble drop on the target?

Collagen is made of fibers and is found in tendons and cartilage. Collagen contributes to meat toughness and is, therefore, an example of which type of protein?

1. Why does CH30 evaporate faster than water?

How does concentration affect our daily lives in science?

How many nitrogen atoms are in 2.79 mo. of NH3

What is the chemical formula for polysaccharide?