If I add together water and an effervescent tablet, will the total mass before mixing be less than, equal to, or greater than the mass after mixing?

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

Which statement accurately represents the arrangement of electrons in bohr’s atomic model?

How many joules of heat are required to raise thetemperature of 750 g of water from 11.0 °c to 19.0 °c?