The valency of calcium is2 ? what does it mean​

When 225mg of anthracene, c14h10(s), was burned in a bomb calorimeter the temperature rose by 1.75k. calculate the calorimeter constant. by how much will the temperature rise when 125mg of phenol, c6h5oh(s), is burned in the calorimeter under the same conditions? (δch< (c14h10,s)=–7061 kj mol−1.)

Can someone me with 1 to 4 plz. fast

Which of the following is not an assumption that scientists must make about the natural world? a. regularity b. causality c. predictability d. plausibility