C12 has 6 protons. how many neutrons does c13 have? a. 6 b. 7 c. 13 d. 19

When rocks return to the earths mantle what are the main factors that control this change.

How can a substance gain energy and still be frozen

Select whether there is no work done by the system, work done by the system or work done by the surroundings for each system described below: A. H2O (l) ⟶ H2O (g) ΔH = 44.0 kJ/mol B. 2 NO (g) + O2 (g) ⟶ 2 NO2 (g) ΔH = - 114.1 kJ/mol C.

What is true about both sodium and gold? A. They are metals. B. They are very reactive. C. They are volatile. D. They are in the same group.

Carbon-14 emits beta radiation and decays with a half-life (t) of 5730 years. Assume that you start with a mass of 6000 g of carbon 14. How many grams of the isotope remains at the end of four half-lives?

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?

U human ear is measured in?

Is the earth older than any of the rock layers.