Covalent bonds happen when electrons are shared by three atoms true false

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

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)]

Asap at one point in history people could measure temperature by looking at the volume of a sample of gas. suppose a sample in a gas thermometer has a volume of 135ml at 11.0°c. indicate what temperature would correspond to each of the following volumes: 113 ml, and 155 ml.