Five years ago, my grandfather was five times as old as I was. Three years from now, my grandfather will be three times as old as I will be. how old am I now?

Which is the ground state electronic configuration of chlorine

It is possible to have more than the maximum amount of solute dissolved in a solvent. A. True B. False

Jennifer is learning the parts of the cell and knows that there must be a structure responsible for maintaining the homeostasis of the cell. This structure is which of the following? A. cell membrane B. Nucleus C. Chloroplast

What must be true of the bonds for a reaction to be endothermic and what must be true for the reaction to be exothermic?

How many particles are present in one mole of particles? a) 6.02 x 10^23 b) 12 c) 3.0 x 108 d) 1

O2 (g) → O2 (l) Predict whether the reaction above would have an increase or a decrease in entropy.

The periodic law states that the physical and chemical properties tend to repeat periodically when elements are arranged according to what trend

In which of the following situations does water undergo a change in physical properties? a. The bathroom fills with steam when you take a hot shower. b. The neighbor's pond freezes over in winter. c. Water is broken down to yield H2 and O2. d. a.

Which statement best describes the ideas of two scientists who studied properties of light? Newton and Maxwell had similar ideas about light being made of particles.

As transformações estão presente em nosso cotidiano, elas nunca param de acontecer, na sua maioria invisível a olho nu. Quais critérios é preciso observar para identificar se ocorreu transformação?