What are some examples of chemical changes?

According to early chemists, which substances were classified as elements? A. those that could not be broken down further by physical means B. those that could not be broken down further by chemical means C.

Argon, which comprises almost 1 percent of the atmosphere, is approximately 27 times more abundant than CO2 but does not contribute to global warming. Which explanation accounts for this fact? a.

Which of the following has six electrons in its valence shell? oxygen nitrogen sodium neon

What might have caused this canyon to form? A) winds blowing in zig-zag way B) frequent earthquakes in the area C) water breaking the rocks into pieces D) heavy rainfall flooding the part of the land

Identify the functional group (s) that appear in the molecule below. oh

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?