Which option correctly describes the pattern of reactivity and electronegativity in nonmetals?(1 point) Both reactivity and electronegativity decrease down a group.

Reactivity decreases down a group, and electronegativity increases down a group.

Both reactivity and electronegativity decrease up a group.

Reactivity increases down a group, and electronegativity decreases down a group.

Which type of stress results when two plates push against one another? a. compression b. tension c. force d. shear

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]

Molecular iodine, i2(g), dissociates into iodine atoms at 625 k with a first-order rate constant of 0.271 s−1. part a part complete what is the half-life for this reaction?