A catalyst is a substance that ... O a ... slows down a chemical reaction. b ... neutralizes an acid. O c ... neutralizes a base. O d ... causes another substance to undergo combustion. Oe ... speeds up a chemical reaction.

3. Where do you find the elements with the least atomic size, greatest electronegativity, and greatest ionization energy in the periodic table?

Important moleculear discoveries in the 1980s have led researchers to hypothesize theat the original vital orgnaic molecule shaping living things was not what was first thought.

Phase changes are chemical changes. True False ... ?

Describe the relationship between the atomic number, mass number, number of protons, number of neutrons.

When the mixture of iron filings and sulpher is heated strongly state two reasons why the solid formed is a compound

If you put a base in water, what will happen? A. it will dissociate B. it will form a covalent bond. C. it will bond with the water molecules

What is the definition of tone?

Which abiotic factor differentiates between the three major types of aquatic biomes? (freshwater, estuary, marine) Question 4 options: sunlight movement salinity oxygen

What's is the percent composition by mass of oxygen in magnesium oxide, Mg0

Which consequence of new fishing methods had the most immediate impact on the environment? A. Diesel engines on newer ships contributed to global warming B. Increased reliance on fish in the American diet led to health problems C.