In a chemical reaction the sum of masses of reactants is equal to the masses of products. Still the reactions are exothermic or endothermic. Are we sure that that energy is result of breaking and reforming the bonds, or there is a problem to as matter can be really converted into energy.
Take a gas. you apply pressure it turn into liquid. Energy is emitted but mass doesn’t change either.
Posts Tagged ‘reactants’
does matter convert into energy?doesn't that contradicts the law of conservation of masses in a chem react?
June 2nd, 2010 
admin 
The law of conservation of mass suggests that in a chemical equation?
June 1st, 2010 admin A) The mass of the products must equal the mass of the reactants
B) The energy of the products must equal the mass of the reactants
C) The electrons of the products must equal the protons of the reactants
D) None of the above
D)
percent error and the conservation of mass-energy?
May 28th, 2010 admin the law of conservation of mass-energy states that the sum of the products minus the sum of the reactants equals zero.
therefore:
(A+B) – (C+D) = 0
but if percent error states:
((actual-accepted)/accepted) x 100 = percent error
but if i got 0.09 and was supposed to get was 0.00 then plugged into percent error =
((0.09-0.00)/0.00) x 100 = undefined
so i don’t know if thats right.. lemme know??
About the Conservation of Kinetic Energy in Relation to Momentum?
May 26th, 2010 admin If two objects collide in an inelastic fashion where object A is 1kg moving 5km/s and object B is 2kg moving -4km/s the final velocity should be -1km/s but with this value the combined kinetic energies of object A and B doesn’t equal the kinetic energy of a 3kg object moving -1m/s. How can the reactants and product have different kinetic energies if their momentums are the same.
Question about Law of conservation of energy and hydrogen bond?
May 24th, 2010 admin Law of conservation of energy states
A. The total number of reactants is unequal to the total mass of the products
B. The total mass of substrates is unequal to the total mass of the reactants
C. The total mass of reactants equals the total mass of the products.
D. The total number of substrates is equal to the total mass of products
E. The total mass of enzymes is equal to the total mass of the products
Which of the following is NOT true of hydrogen bonds?
a. very cohesive
b. very weak intermolecular bonds
c. help determine 3d shape
d. very low surface tension
e. serve as links between molecules