What are elements in the same row or period called

Which of the following is the best evidence that digestion involves chemical change? A Time is required to accomplish results. B The products' mass equals the reactants' mass. C Different compounds are involved. D New substances are produced.

How many molecules of CO2 will be produced by the decomposition of 24.9 mol of Ca (HCO3) 2 in the following reaction: Ca (HCO3) 2 = > CaO (s) + 2CO2 (g) + H2O (g).

What is the electron dot diagram for hydrogen?

1. Force is the ability to change motion. * True False Other:

Which of the following statements best describes why radioactive decay occurs? A) the electric force causes electrons to be released. B) the electric force and nuclear forces are in opposition to each other. C) nuclear forces disintegrate protons.

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?