PLEASE HELP I WILL MARK BRAINLEST potassium oxide is formed from its elements (k=39g/mol, o=16g/mol) 4k(s)+o2(g)=2k2o(s) how many grams of k2o are formed from the reaction?

The is a particle with one unit of positive charge a. proton b. positron c. electron d. nucleus awnser quick it is a important science test!

Use the drop-down menus to answer each question. which runner finished the 100 m race in the least amount of time? which runner stopped running for a few seconds during the race? at what distance did anastasia overtake chloe in the race?

Apiece of copper has a temperature of 75.6 0c. when the metal is placed in 100.0 grams of water at 19.1 0c, the temperature rises by 5.5 0c. what is the mass of the metal?