En que consiste cada familia de la tabla periódica?

Which of the following examples shows that a chemical reaction has occurred? A Teeth chop up an apple slice into smaller pieces. B Sugar placed in sugar water sinks to the bottom. C A glass jar shatters into many pieces when dropped.

Atomic theory as it is known today is the result of the contributions of many scientists who did the research, disproved old models, suggested new models, and added to the atomic theory.

How does an exothermic change show that a chemical reaction occured?

Which type of energy is associated with the random motion of the particles in a sample of gas? (1) chemical energy (2) electromagnetic energy (3) nuclear energy (4) thermal energy

How much heat is evolved in converting 1.00 mol of steam at 145.0 ∘C to ice at - 55.0 ∘C? The heat capacity of steam is 2.01 J / (g⋅∘C) and of ice is 2.09 J / (g⋅∘C).

What can form as a result of a chemical reaction?

A solution of orange juice that weighs 500 g contains liquid juice and solid pulp. All of the pulp is removed from the juice. The pulp is found to weigh 50 g. How much would the remaining liquid juice weigh? A. 50 g B. 250 g C. 450 g D. 500 g

Assume 3 molecules of Fe react according to the following equation. 3Fe + 4H2O Fe3O4 + 4H2 How many molecules of H2 are produced? How many water molecules are required? What is the mole ratio of Fe to H2O?

10.0 mL of a HF solution was titrated with a 0.120 N solution of KOH; 29.6 mL of KOH were required to completely neutralize the HF. Calculate the normality of the HF solution.

The number of grams present in 1.35 mol of Fe is