Each statement best explains why it is more difficult to use coal versus other alternate source of energy except: 1. Coal produces more pollutants in the air.

2. It is more difficult to mine for coal than other minerals.

3. Coals are not commonly used because it is more difficult to burn.

4. Coals are not commonly used because it produces more negative impact to the environment.

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

Brainliesttt me asap! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

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)]